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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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*/ |
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|
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package extra166y; |
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import jsr166y.*; |
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import static extra166y.Ops.*; |
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import java.util.*; |
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|
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/** |
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* A collection of static factory methods providing commonly useful |
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* implementations of operations. |
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*/ |
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public class CommonOps { |
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private CommonOps() {} // disable construction |
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|
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/** |
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* Returns a Comparator for Comparable objects |
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*/ |
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public static <T extends Comparable<? super T>> Comparator<T> |
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naturalComparator(Class<T> type) { |
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return new Comparator<T>() { |
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public int compare(T a, T b) { return a.compareTo(b); } |
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}; |
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} |
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|
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/** |
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* Returns a reducer returning the maximum of two Comparable |
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* elements, treating null as less than any non-null element. |
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*/ |
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public static <T extends Comparable<? super T>> Reducer<T> |
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naturalMaxReducer(Class<T> type) { |
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return new Reducer<T>() { |
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public T op(T a, T b) { |
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return (a != null && |
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(b == null || a.compareTo(b) >= 0))? a : b; |
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} |
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}; |
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} |
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|
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/** |
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* Returns a reducer returning the minimum of two Comparable |
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* elements, treating null as greater than any non-null element. |
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*/ |
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public static <T extends Comparable<? super T>> Reducer<T> |
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naturalMinReducer(Class<T> type) { |
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return new Reducer<T>() { |
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public T op(T a, T b) { |
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return (a != null && |
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(b == null || a.compareTo(b) <= 0))? a : b; |
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} |
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}; |
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} |
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|
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/** |
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* Returns a reducer returning the maximum of two elements, using |
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* the given comparator, and treating null as less than any |
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* non-null element. |
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*/ |
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public static <T> Reducer<T> maxReducer |
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(final Comparator<? super T> comparator) { |
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return new Reducer<T>() { |
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public T op(T a, T b) { |
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return (a != null && |
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(b == null || comparator.compare(a, b) >= 0))? a : b; |
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} |
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}; |
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} |
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|
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/** |
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* Returns a reducer returning the minimum of two elements, using |
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* the given comparator, and treating null as greater than any |
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* non-null element. |
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*/ |
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public static <T> Reducer<T> minReducer |
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(final Comparator<? super T> comparator) { |
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return new Reducer<T>() { |
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public T op(T a, T b) { |
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return (a != null && |
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(b == null || comparator.compare(a, b) <= 0))? a : b; |
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} |
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}; |
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} |
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|
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/** |
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* Returns a Comparator that casts its arguments as Comparable on |
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* each comparison, throwing ClassCastException on failure. |
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*/ |
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public static Comparator<Object> castedComparator() { |
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return (Comparator<Object>)(RawComparator.cmp); |
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} |
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static final class RawComparator implements Comparator { |
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static final RawComparator cmp = new RawComparator(); |
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public int compare(Object a, Object b) { |
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return ((Comparable)a).compareTo((Comparable)b); |
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} |
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} |
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|
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/** |
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* Returns a reducer returning maximum of two values, or |
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* <tt>null</tt> if both arguments are null, and that casts |
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* its arguments as Comparable on each comparison, throwing |
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* ClassCastException on failure. |
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*/ |
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public static Reducer<Object> castedMaxReducer() { |
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return (Reducer<Object>)RawMaxReducer.max; |
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} |
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static final class RawMaxReducer implements Reducer { |
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static final RawMaxReducer max = new RawMaxReducer(); |
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public Object op(Object a, Object b) { |
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return (a != null && |
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(b == null || |
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((Comparable)a).compareTo((Comparable)b) >= 0))? a : b; |
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} |
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} |
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|
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/** |
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* Returns a reducer returning minimum of two values, or |
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* <tt>null</tt> if both arguments are null, and that casts |
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* its arguments as Comparable on each comparison, throwing |
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* ClassCastException on failure. |
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*/ |
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public static Reducer<Object> castedMinReducer() { |
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return (Reducer<Object>)RawMinReducer.min; |
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} |
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static final class RawMinReducer implements Reducer { |
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static final RawMinReducer min = new RawMinReducer(); |
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public Object op(Object a, Object b) { |
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return (a != null && |
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(b == null || |
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((Comparable)a).compareTo((Comparable)b) <= 0))? a : b; |
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} |
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} |
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|
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|
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/** |
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* Returns a comparator for doubles relying on natural ordering |
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*/ |
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public static DoubleComparator naturalDoubleComparator() { |
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return NaturalDoubleComparator.comparator; |
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} |
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static final class NaturalDoubleComparator |
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implements DoubleComparator { |
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static final NaturalDoubleComparator comparator = new |
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NaturalDoubleComparator(); |
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public int compare(double a, double b) { |
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return Double.compare(a, b); |
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} |
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} |
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|
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/** |
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* Returns a reducer returning the maximum of two double elements, |
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* using natural comparator |
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*/ |
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public static DoubleReducer naturalDoubleMaxReducer() { |
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return NaturalDoubleMaxReducer.max; |
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} |
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|
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static final class NaturalDoubleMaxReducer |
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implements DoubleReducer { |
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public static final NaturalDoubleMaxReducer max = |
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new NaturalDoubleMaxReducer(); |
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public double op(double a, double b) { return Math.max(a, b); } |
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} |
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|
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/** |
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* Returns a reducer returning the minimum of two double elements, |
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* using natural comparator |
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*/ |
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public static DoubleReducer naturalDoubleMinReducer() { |
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return NaturalDoubleMinReducer.min; |
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} |
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static final class NaturalDoubleMinReducer |
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implements DoubleReducer { |
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public static final NaturalDoubleMinReducer min = |
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new NaturalDoubleMinReducer(); |
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public double op(double a, double b) { return Math.min(a, b); } |
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} |
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|
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/** |
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* Returns a reducer returning the maximum of two double elements, |
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* using the given comparator |
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*/ |
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public static DoubleReducer doubleMaxReducer |
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(final DoubleComparator comparator) { |
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return new DoubleReducer() { |
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public double op(double a, double b) { |
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return (comparator.compare(a, b) >= 0)? a : b; |
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} |
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}; |
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} |
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|
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/** |
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* Returns a reducer returning the minimum of two double elements, |
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* using the given comparator |
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*/ |
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public static DoubleReducer doubleMinReducer |
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(final DoubleComparator comparator) { |
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return new DoubleReducer() { |
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public double op(double a, double b) { |
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return (comparator.compare(a, b) <= 0)? a : b; |
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} |
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}; |
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} |
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|
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/** |
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* Returns a comparator for longs relying on natural ordering |
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*/ |
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public static LongComparator naturalLongComparator() { |
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return NaturalLongComparator.comparator; |
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} |
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static final class NaturalLongComparator |
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implements LongComparator { |
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static final NaturalLongComparator comparator = new |
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NaturalLongComparator(); |
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public int compare(long a, long b) { |
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return a < b? -1 : ((a > b)? 1 : 0); |
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} |
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} |
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|
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/** |
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* Returns a reducer returning the maximum of two long elements, |
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* using natural comparator |
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*/ |
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public static LongReducer naturalLongMaxReducer() { |
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return NaturalLongMaxReducer.max; |
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} |
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|
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static final class NaturalLongMaxReducer |
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implements LongReducer { |
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public static final NaturalLongMaxReducer max = |
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new NaturalLongMaxReducer(); |
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public long op(long a, long b) { return a >= b? a : b; } |
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} |
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|
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/** |
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* A reducer returning the minimum of two long elements, |
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* using natural comparator |
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*/ |
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public static LongReducer naturalLongMinReducer() { |
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return NaturalLongMinReducer.min; |
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} |
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static final class NaturalLongMinReducer |
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implements LongReducer { |
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public static final NaturalLongMinReducer min = |
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new NaturalLongMinReducer(); |
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public long op(long a, long b) { return a <= b? a : b; } |
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} |
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|
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/** |
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* Returns a reducer returning the maximum of two long elements, |
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* using the given comparator |
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*/ |
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public static LongReducer longMaxReducer |
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(final LongComparator comparator) { |
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return new LongReducer() { |
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public long op(long a, long b) { |
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return (comparator.compare(a, b) >= 0)? a : b; |
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} |
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}; |
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} |
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|
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/** |
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* Returns a reducer returning the minimum of two long elements, |
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* using the given comparator |
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*/ |
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public static LongReducer longMinReducer |
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(final LongComparator comparator) { |
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return new LongReducer() { |
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public long op(long a, long b) { |
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return (comparator.compare(a, b) <= 0)? a : b; |
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} |
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}; |
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} |
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|
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/** |
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* Returns a composite mapper that applies a second mapper to the results |
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* of applying the first one |
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*/ |
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public static <T,U,V> Op<T,V> compoundOp |
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(final Op<? super T, ? extends U> first, |
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final Op<? super U, ? extends V> second) { |
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return new Op<T,V>() { |
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public final V op(T t) { return second.op(first.op(t)); } |
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}; |
288 |
} |
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|
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/** |
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* Returns a composite mapper that applies a second mapper to the results |
292 |
* of applying the first one |
293 |
*/ |
294 |
public static <T,V> Op<T,V> compoundOp |
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(final ObjectToDouble<? super T> first, |
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final DoubleToObject<? extends V> second) { |
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return new Op<T,V>() { |
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public final V op(T t) { return second.op(first.op(t)); } |
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}; |
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} |
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|
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/** |
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* Returns a composite mapper that applies a second mapper to the results |
304 |
* of applying the first one |
305 |
*/ |
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public static <T,V> Op<T,V> compoundOp |
307 |
(final ObjectToLong<? super T> first, |
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final LongToObject<? extends V> second) { |
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return new Op<T,V>() { |
310 |
public final V op(T t) { return second.op(first.op(t)); } |
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}; |
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} |
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|
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/** |
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* Returns a composite mapper that applies a second mapper to the results |
316 |
* of applying the first one |
317 |
*/ |
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public static <T,V> DoubleToObject<V> compoundOp |
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(final DoubleToObject<? extends T> first, |
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final Op<? super T,? extends V> second) { |
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return new DoubleToObject<V>() { |
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public final V op(double t) { return second.op(first.op(t)); } |
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}; |
324 |
} |
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|
326 |
/** |
327 |
* Returns a composite mapper that applies a second mapper to the results |
328 |
* of applying the first one |
329 |
*/ |
330 |
public static <T,V> LongToObject<V> compoundOp |
331 |
(final LongToObject<? extends T> first, |
332 |
final Op<? super T,? extends V> second) { |
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return new LongToObject<V>() { |
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public final V op(long t) { return second.op(first.op(t)); } |
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}; |
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} |
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|
338 |
/** |
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* Returns a composite mapper that applies a second mapper to the results |
340 |
* of applying the first one |
341 |
*/ |
342 |
public static <T,U> ObjectToDouble<T> compoundOp |
343 |
(final Op<? super T, ? extends U> first, |
344 |
final ObjectToDouble<? super U> second) { |
345 |
return new ObjectToDouble<T>() { |
346 |
public final double op(T t) { return second.op(first.op(t)); } |
347 |
}; |
348 |
} |
349 |
|
350 |
/** |
351 |
* Returns a composite mapper that applies a second mapper to the results |
352 |
* of applying the first one |
353 |
*/ |
354 |
public static <T,U> ObjectToLong<T> compoundOp |
355 |
(final Op<? super T, ? extends U> first, |
356 |
final ObjectToLong<? super U> second) { |
357 |
return new ObjectToLong<T>() { |
358 |
public final long op(T t) { return second.op(first.op(t)); } |
359 |
}; |
360 |
} |
361 |
|
362 |
/** |
363 |
* Returns a composite mapper that applies a second mapper to the results |
364 |
* of applying the first one |
365 |
*/ |
366 |
public static <T> ObjectToDouble<T> compoundOp |
367 |
(final ObjectToDouble<? super T> first, |
368 |
final DoubleOp second) { |
369 |
return new ObjectToDouble<T>() { |
370 |
public final double op(T t) { return second.op(first.op(t)); } |
371 |
}; |
372 |
} |
373 |
|
374 |
/** |
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* Returns a composite mapper that applies a second mapper to the results |
376 |
* of applying the first one |
377 |
*/ |
378 |
public static <T> ObjectToLong<T> compoundOp |
379 |
(final ObjectToDouble<? super T> first, |
380 |
final DoubleToLong second) { |
381 |
return new ObjectToLong<T>() { |
382 |
public final long op(T t) { return second.op(first.op(t)); } |
383 |
}; |
384 |
} |
385 |
|
386 |
/** |
387 |
* Returns a composite mapper that applies a second mapper to the results |
388 |
* of applying the first one |
389 |
*/ |
390 |
public static <T> ObjectToLong<T> compoundOp |
391 |
(final ObjectToLong<? super T> first, |
392 |
final LongOp second) { |
393 |
return new ObjectToLong<T>() { |
394 |
public final long op(T t) { return second.op(first.op(t)); } |
395 |
}; |
396 |
} |
397 |
|
398 |
/** |
399 |
* Returns a composite mapper that applies a second mapper to the results |
400 |
* of applying the first one |
401 |
*/ |
402 |
public static <T> ObjectToDouble<T> compoundOp |
403 |
(final ObjectToLong<? super T> first, |
404 |
final LongToDouble second) { |
405 |
return new ObjectToDouble<T>() { |
406 |
public final double op(T t) { return second.op(first.op(t)); } |
407 |
}; |
408 |
} |
409 |
|
410 |
/** |
411 |
* Returns a composite mapper that applies a second mapper to the results |
412 |
* of applying the first one |
413 |
*/ |
414 |
public static DoubleOp compoundOp |
415 |
(final DoubleOp first, |
416 |
final DoubleOp second) { |
417 |
return new DoubleOp() { |
418 |
public final double op(double t) { return second.op(first.op(t)); } |
419 |
}; |
420 |
} |
421 |
|
422 |
/** |
423 |
* Returns a composite mapper that applies a second mapper to the results |
424 |
* of applying the first one |
425 |
*/ |
426 |
public static DoubleToLong compoundOp |
427 |
(final DoubleOp first, |
428 |
final DoubleToLong second) { |
429 |
return new DoubleToLong() { |
430 |
public final long op(double t) { return second.op(first.op(t)); } |
431 |
}; |
432 |
} |
433 |
|
434 |
/** |
435 |
* Returns a composite mapper that applies a second mapper to the results |
436 |
* of applying the first one |
437 |
*/ |
438 |
public static DoubleToLong compoundOp |
439 |
(final DoubleToLong first, |
440 |
final LongOp second) { |
441 |
return new DoubleToLong() { |
442 |
public final long op(double t) { return second.op(first.op(t)); } |
443 |
}; |
444 |
} |
445 |
|
446 |
/** |
447 |
* Returns a composite mapper that applies a second mapper to the results |
448 |
* of applying the first one |
449 |
*/ |
450 |
public static <T> DoubleToObject<T> compoundOp |
451 |
(final DoubleToLong first, |
452 |
final LongToObject<? extends T> second) { |
453 |
return new DoubleToObject<T>() { |
454 |
public final T op(double t) { return second.op(first.op(t)); } |
455 |
}; |
456 |
} |
457 |
|
458 |
/** |
459 |
* Returns a composite mapper that applies a second mapper to the results |
460 |
* of applying the first one |
461 |
*/ |
462 |
public static <T> LongToObject<T> compoundOp |
463 |
(final LongToDouble first, |
464 |
final DoubleToObject<? extends T> second) { |
465 |
return new LongToObject<T>() { |
466 |
public final T op(long t) { return second.op(first.op(t)); } |
467 |
}; |
468 |
} |
469 |
|
470 |
/** |
471 |
* Returns a composite mapper that applies a second mapper to the results |
472 |
* of applying the first one |
473 |
*/ |
474 |
public static LongToDouble compoundOp |
475 |
(final LongOp first, |
476 |
final LongToDouble second) { |
477 |
return new LongToDouble() { |
478 |
public final double op(long t) { return second.op(first.op(t)); } |
479 |
}; |
480 |
} |
481 |
|
482 |
/** |
483 |
* Returns a composite mapper that applies a second mapper to the results |
484 |
* of applying the first one |
485 |
*/ |
486 |
public static LongToDouble compoundOp |
487 |
(final LongToDouble first, |
488 |
final DoubleOp second) { |
489 |
return new LongToDouble() { |
490 |
public final double op(long t) { return second.op(first.op(t)); } |
491 |
}; |
492 |
} |
493 |
|
494 |
/** |
495 |
* Returns a composite mapper that applies a second mapper to the results |
496 |
* of applying the first one |
497 |
*/ |
498 |
public static <T> DoubleToObject<T> compoundOp |
499 |
(final DoubleOp first, |
500 |
final DoubleToObject<? extends T> second) { |
501 |
return new DoubleToObject<T>() { |
502 |
public final T op(double t) { return second.op(first.op(t)); } |
503 |
}; |
504 |
} |
505 |
|
506 |
/** |
507 |
* Returns a composite mapper that applies a second mapper to the results |
508 |
* of applying the first one |
509 |
*/ |
510 |
public static <T> LongToObject<T> compoundOp |
511 |
(final LongOp first, |
512 |
final LongToObject<? extends T> second) { |
513 |
return new LongToObject<T>() { |
514 |
public final T op(long t) { return second.op(first.op(t)); } |
515 |
}; |
516 |
} |
517 |
|
518 |
/** |
519 |
* Returns a composite mapper that applies a second mapper to the results |
520 |
* of applying the first one |
521 |
*/ |
522 |
public static <T> DoubleOp compoundOp |
523 |
(final DoubleToObject<? extends T> first, |
524 |
final ObjectToDouble<? super T> second) { |
525 |
return new DoubleOp() { |
526 |
public final double op(double t) { return second.op(first.op(t)); } |
527 |
}; |
528 |
} |
529 |
|
530 |
/** |
531 |
* Returns a composite mapper that applies a second mapper to the results |
532 |
* of applying the first one |
533 |
*/ |
534 |
public static <T> LongToDouble compoundOp |
535 |
(final LongToObject<? extends T> first, |
536 |
final ObjectToDouble<? super T> second) { |
537 |
return new LongToDouble() { |
538 |
public final double op(long t) { return second.op(first.op(t)); } |
539 |
}; |
540 |
} |
541 |
|
542 |
/** |
543 |
* Returns a composite mapper that applies a second mapper to the results |
544 |
* of applying the first one |
545 |
*/ |
546 |
public static <T> DoubleToLong compoundOp |
547 |
(final DoubleToObject<? extends T> first, |
548 |
final ObjectToLong<? super T> second) { |
549 |
return new DoubleToLong() { |
550 |
public final long op(double t) { return second.op(first.op(t)); } |
551 |
}; |
552 |
} |
553 |
|
554 |
/** |
555 |
* Returns a composite mapper that applies a second mapper to the results |
556 |
* of applying the first one |
557 |
*/ |
558 |
public static <T> LongOp compoundOp |
559 |
(final LongToObject<? extends T> first, |
560 |
final ObjectToLong<? super T> second) { |
561 |
return new LongOp() { |
562 |
public final long op(long t) { return second.op(first.op(t)); } |
563 |
}; |
564 |
} |
565 |
|
566 |
/** |
567 |
* Returns a composite mapper that applies a second mapper to the results |
568 |
* of applying the first one |
569 |
*/ |
570 |
public static LongOp compoundOp |
571 |
(final LongOp first, |
572 |
final LongOp second) { |
573 |
return new LongOp() { |
574 |
public final long op(long t) { return second.op(first.op(t)); } |
575 |
}; |
576 |
} |
577 |
|
578 |
/** |
579 |
* Returns a composite mapper that applies a second mapper to the results |
580 |
* of applying the first one |
581 |
*/ |
582 |
public static DoubleOp compoundOp |
583 |
(final DoubleToLong first, |
584 |
final LongToDouble second) { |
585 |
return new DoubleOp() { |
586 |
public final double op(double t) { return second.op(first.op(t)); } |
587 |
}; |
588 |
} |
589 |
|
590 |
/** |
591 |
* Returns a composite mapper that applies a second mapper to the results |
592 |
* of applying the first one |
593 |
*/ |
594 |
public static LongOp compoundOp |
595 |
(final LongToDouble first, |
596 |
final DoubleToLong second) { |
597 |
return new LongOp() { |
598 |
public final long op(long t) { return second.op(first.op(t)); } |
599 |
}; |
600 |
} |
601 |
|
602 |
/** |
603 |
* Returns a predicate evaluating to the negation of its contained predicate |
604 |
*/ |
605 |
public static <T> Predicate<T> notPredicate |
606 |
(final Predicate<T> pred) { |
607 |
return new Predicate<T>() { |
608 |
public final boolean op(T x) { return !pred.op(x); } |
609 |
}; |
610 |
} |
611 |
|
612 |
/** |
613 |
* Returns a predicate evaluating to the negation of its contained predicate |
614 |
*/ |
615 |
public static DoublePredicate notPredicate |
616 |
(final DoublePredicate pred) { |
617 |
return new DoublePredicate() { |
618 |
public final boolean op(double x) { return !pred.op(x); } |
619 |
}; |
620 |
} |
621 |
|
622 |
/** |
623 |
* Returns a predicate evaluating to the negation of its contained predicate |
624 |
*/ |
625 |
public static LongPredicate notPredicate |
626 |
(final LongPredicate pred) { |
627 |
return new LongPredicate() { |
628 |
public final boolean op(long x) { return !pred.op(x); } |
629 |
}; |
630 |
} |
631 |
|
632 |
/** |
633 |
* Returns a predicate evaluating to the conjunction of its contained predicates |
634 |
*/ |
635 |
public static <S, T extends S> Predicate<T> andPredicate |
636 |
(final Predicate<S> first, |
637 |
final Predicate<? super T> second) { |
638 |
return new Predicate<T>() { |
639 |
public final boolean op(T x) { |
640 |
return first.op(x) && second.op(x); |
641 |
} |
642 |
}; |
643 |
} |
644 |
|
645 |
/** |
646 |
* Returns a predicate evaluating to the disjunction of its contained predicates |
647 |
*/ |
648 |
public static <S, T extends S> Predicate<T> orPredicate |
649 |
(final Predicate<S> first, |
650 |
final Predicate<? super T> second) { |
651 |
return new Predicate<T>() { |
652 |
public final boolean op(T x) { |
653 |
return first.op(x) || second.op(x); |
654 |
} |
655 |
}; |
656 |
} |
657 |
|
658 |
/** |
659 |
* Returns a predicate evaluating to the conjunction of its contained predicates |
660 |
*/ |
661 |
public static DoublePredicate andPredicate |
662 |
(final DoublePredicate first, |
663 |
final DoublePredicate second) { |
664 |
return new DoublePredicate() { |
665 |
public final boolean op(double x) { |
666 |
return first.op(x) && second.op(x); |
667 |
} |
668 |
}; |
669 |
} |
670 |
|
671 |
/** |
672 |
* Returns a predicate evaluating to the disjunction of its contained predicates |
673 |
*/ |
674 |
public static DoublePredicate orPredicate |
675 |
(final DoublePredicate first, |
676 |
final DoublePredicate second) { |
677 |
return new DoublePredicate() { |
678 |
public final boolean op(double x) { |
679 |
return first.op(x) || second.op(x); |
680 |
} |
681 |
}; |
682 |
} |
683 |
|
684 |
|
685 |
/** |
686 |
* Returns a predicate evaluating to the conjunction of its contained predicates |
687 |
*/ |
688 |
public static LongPredicate andPredicate |
689 |
(final LongPredicate first, |
690 |
final LongPredicate second) { |
691 |
return new LongPredicate() { |
692 |
public final boolean op(long x) { |
693 |
return first.op(x) && second.op(x); |
694 |
} |
695 |
}; |
696 |
} |
697 |
|
698 |
/** |
699 |
* Returns a predicate evaluating to the disjunction of its contained predicates |
700 |
*/ |
701 |
public static LongPredicate orPredicate |
702 |
(final LongPredicate first, |
703 |
final LongPredicate second) { |
704 |
return new LongPredicate() { |
705 |
public final boolean op(long x) { |
706 |
return first.op(x) || second.op(x); |
707 |
} |
708 |
}; |
709 |
} |
710 |
|
711 |
/** |
712 |
* Returns a predicate evaluating to true if its argument is non-null |
713 |
*/ |
714 |
public static Predicate<Object> isNonNullPredicate() { |
715 |
return IsNonNullPredicate.predicate; |
716 |
} |
717 |
static final class IsNonNullPredicate implements Predicate<Object> { |
718 |
static final IsNonNullPredicate predicate = |
719 |
new IsNonNullPredicate(); |
720 |
public final boolean op(Object x) { |
721 |
return x != null; |
722 |
} |
723 |
} |
724 |
|
725 |
/** |
726 |
* Returns a predicate evaluating to true if its argument is null |
727 |
*/ |
728 |
public static Predicate<Object> isNullPredicate() { |
729 |
return IsNullPredicate.predicate; |
730 |
} |
731 |
static final class IsNullPredicate implements Predicate<Object> { |
732 |
static final IsNullPredicate predicate = |
733 |
new IsNullPredicate(); |
734 |
public final boolean op(Object x) { |
735 |
return x != null; |
736 |
} |
737 |
} |
738 |
|
739 |
/** |
740 |
* Returns a predicate evaluating to true if its argument is an instance |
741 |
* of (see {@link Class#isInstance} the given type (class). |
742 |
*/ |
743 |
public static Predicate<Object> instanceofPredicate(final Class type) { |
744 |
return new Predicate<Object>() { |
745 |
public final boolean op(Object x) { |
746 |
return type.isInstance(x); |
747 |
} |
748 |
}; |
749 |
} |
750 |
|
751 |
/** |
752 |
* Returns a predicate evaluating to true if its argument is assignable |
753 |
* from (see {@link Class#isAssignableFrom} the given type (class). |
754 |
*/ |
755 |
public static Predicate<Object> isAssignablePredicate(final Class type) { |
756 |
return new Predicate<Object>() { |
757 |
public final boolean op(Object x) { |
758 |
return type.isAssignableFrom(x.getClass()); |
759 |
} |
760 |
}; |
761 |
} |
762 |
|
763 |
/** |
764 |
* Returns a reducer that adds two double elements |
765 |
*/ |
766 |
public static DoubleReducer doubleAdder() { return DoubleAdder.adder; } |
767 |
static final class DoubleAdder implements DoubleReducer { |
768 |
static final DoubleAdder adder = new DoubleAdder(); |
769 |
public double op(double a, double b) { return a + b; } |
770 |
} |
771 |
|
772 |
/** |
773 |
* Returns a reducer that adds two long elements |
774 |
*/ |
775 |
public static LongReducer longAdder() { return LongAdder.adder; } |
776 |
static final class LongAdder implements LongReducer { |
777 |
static final LongAdder adder = new LongAdder(); |
778 |
public long op(long a, long b) { return a + b; } |
779 |
} |
780 |
|
781 |
/** |
782 |
* Returns a reducer that adds two int elements |
783 |
*/ |
784 |
public static IntReducer intAdder() { return IntAdder.adder; } |
785 |
static final class IntAdder implements IntReducer { |
786 |
static final IntAdder adder = new IntAdder(); |
787 |
public int op(int a, int b) { return a + b; } |
788 |
} |
789 |
|
790 |
/** |
791 |
* Returns a generator producing uniform random values between |
792 |
* zero and one, with the same properties as {@link |
793 |
* java.util.Random#nextDouble} but operating independently across |
794 |
* ForkJoinWorkerThreads and usable only within forkjoin |
795 |
* computations. |
796 |
*/ |
797 |
public static DoubleGenerator doubleRandom() { |
798 |
return DoubleRandomGenerator.generator; |
799 |
} |
800 |
static final class DoubleRandomGenerator implements DoubleGenerator { |
801 |
static final DoubleRandomGenerator generator = |
802 |
new DoubleRandomGenerator(); |
803 |
public double op() { |
804 |
return ForkJoinWorkerThread.nextRandomDouble(); |
805 |
} |
806 |
} |
807 |
|
808 |
/** |
809 |
* Returns a generator producing uniform random values between |
810 |
* zero and the given bound, with the same properties as {@link |
811 |
* java.util.Random#nextDouble} but operating independently across |
812 |
* ForkJoinWorkerThreads and usable only within forkjoin |
813 |
* computations. |
814 |
* @param bound the upper bound (exclusive) of opd values |
815 |
*/ |
816 |
public static DoubleGenerator doubleRandom(double bound) { |
817 |
return new DoubleBoundedRandomGenerator(bound); |
818 |
} |
819 |
static final class DoubleBoundedRandomGenerator implements DoubleGenerator { |
820 |
final double bound; |
821 |
DoubleBoundedRandomGenerator(double bound) { this.bound = bound; } |
822 |
public double op() { |
823 |
return ForkJoinWorkerThread.nextRandomDouble() * bound; |
824 |
} |
825 |
} |
826 |
|
827 |
/** |
828 |
* Returns a generator producing uniform random values between the |
829 |
* given least value (inclusive) and bound (exclusive), operating |
830 |
* independently across ForkJoinWorkerThreads and usable only |
831 |
* within forkjoin computations. |
832 |
* @param least the least value returned |
833 |
* @param bound the upper bound (exclusive) of opd values |
834 |
*/ |
835 |
public static DoubleGenerator doubleRandom(double least, double bound) { |
836 |
return new DoubleIntervalRandomGenerator(least, bound); |
837 |
} |
838 |
static final class DoubleIntervalRandomGenerator implements DoubleGenerator { |
839 |
final double least; |
840 |
final double range; |
841 |
DoubleIntervalRandomGenerator(double least, double bound) { |
842 |
this.least = least; this.range = bound - least; |
843 |
} |
844 |
public double op() { |
845 |
return ForkJoinWorkerThread.nextRandomDouble() * range + least; |
846 |
} |
847 |
} |
848 |
|
849 |
/** |
850 |
* Returns a generator producing uniform random values with the |
851 |
* same properties as {@link java.util.Random#nextLong} but |
852 |
* operating independently across ForkJoinWorkerThreads and usable |
853 |
* only within forkjoin computations. |
854 |
*/ |
855 |
public static LongGenerator longRandom() { |
856 |
return LongRandomGenerator.generator; |
857 |
} |
858 |
static final class LongRandomGenerator implements LongGenerator { |
859 |
static final LongRandomGenerator generator = |
860 |
new LongRandomGenerator(); |
861 |
public long op() { |
862 |
return ForkJoinWorkerThread.nextRandomLong(); |
863 |
} |
864 |
} |
865 |
|
866 |
/** |
867 |
* Returns a generator producing uniform random values with the |
868 |
* same properties as {@link java.util.Random#nextInt(int)} but |
869 |
* operating independently across ForkJoinWorkerThreads and usable |
870 |
* only within forkjoin computations. |
871 |
* @param bound the upper bound (exclusive) of opd values |
872 |
*/ |
873 |
public static LongGenerator longRandom(long bound) { |
874 |
if (bound <= 0) |
875 |
throw new IllegalArgumentException(); |
876 |
return new LongBoundedRandomGenerator(bound); |
877 |
} |
878 |
static final class LongBoundedRandomGenerator implements LongGenerator { |
879 |
final long bound; |
880 |
LongBoundedRandomGenerator(long bound) { this.bound = bound; } |
881 |
public long op() { |
882 |
return ForkJoinWorkerThread.nextRandomLong(bound); |
883 |
} |
884 |
} |
885 |
|
886 |
/** |
887 |
* Returns a generator producing uniform random values between the |
888 |
* given least value (inclusive) and bound (exclusive), operating |
889 |
* independently across ForkJoinWorkerThreads and usable only |
890 |
* within forkjoin computations. |
891 |
* @param least the least value returned |
892 |
* @param bound the upper bound (exclusive) of opd values |
893 |
*/ |
894 |
public static LongGenerator longRandom(long least, long bound) { |
895 |
if (least >= bound) |
896 |
throw new IllegalArgumentException(); |
897 |
return new LongIntervalRandomGenerator(least, bound); |
898 |
} |
899 |
static final class LongIntervalRandomGenerator implements LongGenerator { |
900 |
final long least; |
901 |
final long range; |
902 |
LongIntervalRandomGenerator(long least, long bound) { |
903 |
this.least = least; this.range = bound - least; |
904 |
} |
905 |
public long op() { |
906 |
return ForkJoinWorkerThread.nextRandomLong(range) + least; |
907 |
} |
908 |
} |
909 |
|
910 |
/** |
911 |
* Returns a generator producing uniform random values with the |
912 |
* same properties as {@link java.util.Random#nextInt} but |
913 |
* operating independently across ForkJoinWorkerThreads and usable |
914 |
* only within forkjoin computations. |
915 |
*/ |
916 |
public static IntGenerator intRandom() { |
917 |
return IntRandomGenerator.generator; |
918 |
} |
919 |
static final class IntRandomGenerator implements IntGenerator { |
920 |
static final IntRandomGenerator generator = |
921 |
new IntRandomGenerator(); |
922 |
public int op() { |
923 |
return ForkJoinWorkerThread.nextRandomInt(); |
924 |
} |
925 |
} |
926 |
|
927 |
/** |
928 |
* Returns a generator producing uniform random values with the |
929 |
* same properties as {@link java.util.Random#nextInt(int)} but |
930 |
* operating independently across ForkJoinWorkerThreads and usable |
931 |
* only within forkjoin computations. |
932 |
* @param bound the upper bound (exclusive) of opd values |
933 |
*/ |
934 |
public static IntGenerator intRandom(int bound) { |
935 |
if (bound <= 0) |
936 |
throw new IllegalArgumentException(); |
937 |
return new IntBoundedRandomGenerator(bound); |
938 |
} |
939 |
static final class IntBoundedRandomGenerator implements IntGenerator { |
940 |
final int bound; |
941 |
IntBoundedRandomGenerator(int bound) { this.bound = bound; } |
942 |
public int op() { |
943 |
return ForkJoinWorkerThread.nextRandomInt(bound); |
944 |
} |
945 |
} |
946 |
|
947 |
/** |
948 |
* Returns a generator producing uniform random values between the |
949 |
* given least value (inclusive) and bound (exclusive), operating |
950 |
* independently across ForkJoinWorkerThreads and usable only |
951 |
* within forkjoin computations. |
952 |
* @param least the least value returned |
953 |
* @param bound the upper bound (exclusive) of opd values |
954 |
*/ |
955 |
public static IntGenerator intRandom(int least, int bound) { |
956 |
if (least >= bound) |
957 |
throw new IllegalArgumentException(); |
958 |
return new IntIntervalRandomGenerator(least, bound); |
959 |
} |
960 |
static final class IntIntervalRandomGenerator implements IntGenerator { |
961 |
final int least; |
962 |
final int range; |
963 |
IntIntervalRandomGenerator(int least, int bound) { |
964 |
this.least = least; this.range = bound - least; |
965 |
} |
966 |
public int op() { |
967 |
return ForkJoinWorkerThread.nextRandomInt(range) + least; |
968 |
} |
969 |
} |
970 |
|
971 |
/** |
972 |
* Returns a predicate evaluating to true if the |
973 |
* first argument <tt>equals</tt> the second |
974 |
*/ |
975 |
public static BinaryPredicate<Object, Object> equalityPredicate() { |
976 |
return EqualityPredicate.predicate; |
977 |
} |
978 |
static final class EqualityPredicate implements BinaryPredicate<Object, Object> { |
979 |
static final EqualityPredicate predicate = |
980 |
new EqualityPredicate(); |
981 |
public final boolean op(Object x, Object y) { |
982 |
return x.equals(y); |
983 |
} |
984 |
} |
985 |
|
986 |
/** |
987 |
* Returns a predicate evaluating to true if the |
988 |
* first argument <tt>==</tt> the second |
989 |
*/ |
990 |
public static BinaryPredicate<Object, Object> identityPredicate() { |
991 |
return IdentityPredicate.predicate; |
992 |
} |
993 |
static final class IdentityPredicate implements BinaryPredicate<Object, Object> { |
994 |
static final IdentityPredicate predicate = |
995 |
new IdentityPredicate(); |
996 |
public final boolean op(Object x, Object y) { |
997 |
return x == y; |
998 |
} |
999 |
} |
1000 |
|
1001 |
/** |
1002 |
* Returns a predicate evaluating to true if the |
1003 |
* first argument <tt>==</tt> the second |
1004 |
*/ |
1005 |
public static BinaryIntPredicate intEqualityPredicate() { |
1006 |
return IntEqualityPredicate.predicate; |
1007 |
} |
1008 |
static final class IntEqualityPredicate implements BinaryIntPredicate { |
1009 |
static final IntEqualityPredicate predicate = |
1010 |
new IntEqualityPredicate(); |
1011 |
public final boolean op(int x, int y) { |
1012 |
return x == y; |
1013 |
} |
1014 |
} |
1015 |
|
1016 |
/** |
1017 |
* Returns a predicate evaluating to true if the |
1018 |
* first argument <tt>==</tt> the second |
1019 |
*/ |
1020 |
public static BinaryLongPredicate longEqualityPredicate() { |
1021 |
return LongEqualityPredicate.predicate; |
1022 |
} |
1023 |
static final class LongEqualityPredicate implements BinaryLongPredicate { |
1024 |
static final LongEqualityPredicate predicate = |
1025 |
new LongEqualityPredicate(); |
1026 |
public final boolean op(long x, long y) { |
1027 |
return x == y; |
1028 |
} |
1029 |
} |
1030 |
|
1031 |
/** |
1032 |
* Returns a predicate evaluating to true if the |
1033 |
* first argument <tt>==</tt> the second |
1034 |
*/ |
1035 |
public static BinaryDoublePredicate doubleEqualityPredicate() { |
1036 |
return DoubleEqualityPredicate.predicate; |
1037 |
} |
1038 |
static final class DoubleEqualityPredicate implements BinaryDoublePredicate { |
1039 |
static final DoubleEqualityPredicate predicate = |
1040 |
new DoubleEqualityPredicate(); |
1041 |
public final boolean op(double x, double y) { |
1042 |
return x == y; |
1043 |
} |
1044 |
} |
1045 |
|
1046 |
|
1047 |
/** |
1048 |
* Returns a predicate evaluating to true if the |
1049 |
* first argument <tt>!equals</tt> the second |
1050 |
*/ |
1051 |
public static BinaryPredicate<Object, Object> inequalityPredicate() { |
1052 |
return InequalityPredicate.predicate; |
1053 |
} |
1054 |
static final class InequalityPredicate implements BinaryPredicate<Object, Object> { |
1055 |
static final InequalityPredicate predicate = |
1056 |
new InequalityPredicate(); |
1057 |
public final boolean op(Object x, Object y) { |
1058 |
return !x.equals(y); |
1059 |
} |
1060 |
} |
1061 |
|
1062 |
/** |
1063 |
* Returns a predicate evaluating to true if the |
1064 |
* first argument <tt>!=</tt> the second |
1065 |
*/ |
1066 |
public static BinaryPredicate<Object, Object> nonidentityPredicate() { |
1067 |
return NonidentityPredicate.predicate; |
1068 |
} |
1069 |
static final class NonidentityPredicate implements BinaryPredicate<Object, Object> { |
1070 |
static final NonidentityPredicate predicate = |
1071 |
new NonidentityPredicate(); |
1072 |
public final boolean op(Object x, Object y) { |
1073 |
return x != y; |
1074 |
} |
1075 |
} |
1076 |
|
1077 |
/** |
1078 |
* Returns a predicate evaluating to true if the |
1079 |
* first argument <tt>!=</tt> the second |
1080 |
*/ |
1081 |
public static BinaryIntPredicate intInequalityPredicate() { |
1082 |
return IntInequalityPredicate.predicate; |
1083 |
} |
1084 |
static final class IntInequalityPredicate implements BinaryIntPredicate { |
1085 |
static final IntInequalityPredicate predicate = |
1086 |
new IntInequalityPredicate(); |
1087 |
public final boolean op(int x, int y) { |
1088 |
return x != y; |
1089 |
} |
1090 |
} |
1091 |
|
1092 |
/** |
1093 |
* Returns a predicate evaluating to true if the |
1094 |
* first argument <tt>==</tt> the second |
1095 |
*/ |
1096 |
public static BinaryLongPredicate longInequalityPredicate() { |
1097 |
return LongInequalityPredicate.predicate; |
1098 |
} |
1099 |
static final class LongInequalityPredicate implements BinaryLongPredicate { |
1100 |
static final LongInequalityPredicate predicate = |
1101 |
new LongInequalityPredicate(); |
1102 |
public final boolean op(long x, long y) { |
1103 |
return x != y; |
1104 |
} |
1105 |
} |
1106 |
|
1107 |
/** |
1108 |
* Returns a predicate evaluating to true if the |
1109 |
* first argument <tt>!=</tt> the second |
1110 |
*/ |
1111 |
public static BinaryDoublePredicate doubleInequalityPredicate() { |
1112 |
return DoubleInequalityPredicate.predicate; |
1113 |
} |
1114 |
static final class DoubleInequalityPredicate implements BinaryDoublePredicate { |
1115 |
static final DoubleInequalityPredicate predicate = |
1116 |
new DoubleInequalityPredicate(); |
1117 |
public final boolean op(double x, double y) { |
1118 |
return x != y; |
1119 |
} |
1120 |
} |
1121 |
|
1122 |
|
1123 |
} |