1 |
dl |
1.1 |
/* |
2 |
|
|
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
|
|
* Expert Group and released to the public domain, as explained at |
4 |
jsr166 |
1.2 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
dl |
1.1 |
*/ |
6 |
|
|
|
7 |
|
|
package extra166y; |
8 |
|
|
import jsr166y.*; |
9 |
|
|
import static extra166y.Ops.*; |
10 |
|
|
import java.util.*; |
11 |
|
|
import java.util.concurrent.atomic.*; |
12 |
|
|
import java.lang.reflect.Array; |
13 |
|
|
|
14 |
|
|
/** |
15 |
|
|
* A prefix view of ParallelLongArray that causes operations to apply |
16 |
|
|
* only to elements within a given range. |
17 |
|
|
* Instances of this class may be constructed only via prefix |
18 |
|
|
* methods of ParallelLongArray or its other prefix classes. |
19 |
|
|
*/ |
20 |
|
|
public abstract class ParallelLongArrayWithBounds extends ParallelLongArrayWithFilter { |
21 |
|
|
ParallelLongArrayWithBounds |
22 |
|
|
(ForkJoinPool ex, int origin, int fence, long[] array) { |
23 |
|
|
super(ex, origin, fence, array); |
24 |
|
|
} |
25 |
|
|
|
26 |
|
|
/** |
27 |
|
|
* Returns an operation prefix that causes a method to operate |
28 |
|
|
* only on the elements of the array between firstIndex |
29 |
|
|
* (inclusive) and upperBound (exclusive). The bound |
30 |
|
|
* arguments are relative to the current bounds. For example |
31 |
|
|
* <tt>pa.withBounds(2, 8).withBounds(3, 5)</tt> indexes the |
32 |
|
|
* 5th (= 2+3) and 6th elements of pa. However, indices |
33 |
|
|
* returned by methods such as <tt>indexOf</tt> are |
34 |
|
|
* with respect to the underlying ParallelLongArray. |
35 |
|
|
* @param firstIndex the lower bound (inclusive) |
36 |
|
|
* @param upperBound the upper bound (exclusive) |
37 |
|
|
* @return operation prefix |
38 |
|
|
*/ |
39 |
|
|
public abstract ParallelLongArrayWithBounds withBounds |
40 |
|
|
(int firstIndex, int upperBound); |
41 |
|
|
|
42 |
|
|
/** |
43 |
|
|
* Returns the index of some element equal to given target, or |
44 |
|
|
* -1 if not present |
45 |
|
|
* @param target the element to search for |
46 |
|
|
* @return the index or -1 if not present |
47 |
|
|
*/ |
48 |
|
|
public abstract int indexOf(long target); |
49 |
|
|
|
50 |
|
|
/** |
51 |
|
|
* Assuming this array is sorted, returns the index of an |
52 |
|
|
* element equal to given target, or -1 if not present. If the |
53 |
|
|
* array is not sorted, the results are undefined. |
54 |
|
|
* @param target the element to search for |
55 |
|
|
* @return the index or -1 if not present |
56 |
|
|
*/ |
57 |
|
|
public abstract int binarySearch(long target); |
58 |
|
|
|
59 |
|
|
/** |
60 |
|
|
* Assuming this array is sorted with respect to the given |
61 |
|
|
* comparator, returns the index of an element equal to given |
62 |
|
|
* target, or -1 if not present. If the array is not sorted, |
63 |
|
|
* the results are undefined. |
64 |
|
|
* @param target the element to search for |
65 |
|
|
* @param comparator the comparator |
66 |
|
|
* @return the index or -1 if not present |
67 |
|
|
*/ |
68 |
|
|
public abstract int binarySearch(long target, LongComparator comparator); |
69 |
|
|
|
70 |
|
|
/** |
71 |
|
|
* Replaces each element with the running cumulation of applying |
72 |
|
|
* the given reducer. |
73 |
|
|
* @param reducer the reducer |
74 |
|
|
* @param base the result for an empty array |
75 |
|
|
* @return this (to simplify use in expressions) |
76 |
|
|
*/ |
77 |
|
|
public abstract ParallelLongArrayWithBounds cumulate(LongReducer reducer, long base); |
78 |
|
|
|
79 |
|
|
/** |
80 |
|
|
* Replaces each element with the running sum |
81 |
|
|
* @return this (to simplify use in expressions) |
82 |
|
|
*/ |
83 |
|
|
public abstract ParallelLongArrayWithBounds cumulateSum(); |
84 |
|
|
|
85 |
|
|
/** |
86 |
|
|
* Replaces each element with the cumulation of applying the given |
87 |
|
|
* reducer to all previous values, and returns the total |
88 |
|
|
* reduction. |
89 |
|
|
* @param reducer the reducer |
90 |
|
|
* @param base the result for an empty array |
91 |
|
|
* @return the total reduction |
92 |
|
|
*/ |
93 |
|
|
public abstract long precumulate(LongReducer reducer, long base); |
94 |
|
|
|
95 |
|
|
/** |
96 |
|
|
* Replaces each element with its prefix sum |
97 |
|
|
* @return the total sum |
98 |
|
|
*/ |
99 |
|
|
public abstract long precumulateSum(); |
100 |
|
|
|
101 |
|
|
/** |
102 |
|
|
* Sorts the elements. |
103 |
|
|
* Unlike Arrays.sort, this sort does |
104 |
|
|
* not guarantee that elements with equal keys maintain their |
105 |
|
|
* relative position in the array. |
106 |
|
|
* @param cmp the comparator to use |
107 |
|
|
* @return this (to simplify use in expressions) |
108 |
|
|
*/ |
109 |
|
|
public abstract ParallelLongArrayWithBounds sort(LongComparator cmp); |
110 |
|
|
|
111 |
|
|
/** |
112 |
|
|
* Sorts the elements, assuming all elements are |
113 |
|
|
* Comparable. Unlike Arrays.sort, this sort does not |
114 |
|
|
* guarantee that elements with equal keys maintain their relative |
115 |
|
|
* position in the array. |
116 |
|
|
* @throws ClassCastException if any element is not Comparable. |
117 |
|
|
* @return this (to simplify use in expressions) |
118 |
|
|
*/ |
119 |
|
|
public abstract ParallelLongArrayWithBounds sort(); |
120 |
|
|
|
121 |
|
|
} |