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 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
*/ |
6 |
|
7 |
package extra166y; |
8 |
|
9 |
import jsr166y.*; |
10 |
import static extra166y.Ops.*; |
11 |
import java.util.*; |
12 |
import java.util.concurrent.atomic.*; |
13 |
import java.lang.reflect.Array; |
14 |
|
15 |
/** |
16 |
* A prefix view of ParallelLongArray that causes operations to apply |
17 |
* only to elements within a given range. |
18 |
* Instances of this class may be constructed only via prefix |
19 |
* methods of ParallelLongArray or its other prefix classes. |
20 |
*/ |
21 |
public abstract class ParallelLongArrayWithBounds extends ParallelLongArrayWithFilter { |
22 |
ParallelLongArrayWithBounds |
23 |
(ForkJoinPool ex, int origin, int fence, long[] array) { |
24 |
super(ex, origin, fence, array); |
25 |
} |
26 |
|
27 |
/** |
28 |
* Returns an operation prefix that causes a method to operate |
29 |
* only on the elements of the array between firstIndex |
30 |
* (inclusive) and upperBound (exclusive). The bound |
31 |
* arguments are relative to the current bounds. For example |
32 |
* {@code pa.withBounds(2, 8).withBounds(3, 5)} indexes the |
33 |
* 5th (= 2+3) and 6th elements of pa. However, indices |
34 |
* returned by methods such as {@code indexOf} are |
35 |
* with respect to the underlying ParallelLongArray. |
36 |
* @param firstIndex the lower bound (inclusive) |
37 |
* @param upperBound the upper bound (exclusive) |
38 |
* @return operation prefix |
39 |
*/ |
40 |
public abstract ParallelLongArrayWithBounds withBounds |
41 |
(int firstIndex, int upperBound); |
42 |
|
43 |
/** |
44 |
* Returns the index of some element equal to given target, or |
45 |
* -1 if not present. |
46 |
* @param target the element to search for |
47 |
* @return the index or -1 if not present |
48 |
*/ |
49 |
public abstract int indexOf(long target); |
50 |
|
51 |
/** |
52 |
* Assuming this array is sorted, returns the index of an |
53 |
* element equal to given target, or -1 if not present. If the |
54 |
* array is not sorted, the results are undefined. |
55 |
* @param target the element to search for |
56 |
* @return the index or -1 if not present |
57 |
*/ |
58 |
public abstract int binarySearch(long target); |
59 |
|
60 |
/** |
61 |
* Assuming this array is sorted with respect to the given |
62 |
* comparator, returns the index of an element equal to given |
63 |
* target, or -1 if not present. If the array is not sorted, |
64 |
* the results are undefined. |
65 |
* @param target the element to search for |
66 |
* @param comparator the comparator |
67 |
* @return the index or -1 if not present |
68 |
*/ |
69 |
public abstract int binarySearch(long target, LongComparator comparator); |
70 |
|
71 |
/** |
72 |
* Replaces each element with the running cumulation of applying |
73 |
* the given reducer. |
74 |
* @param reducer the reducer |
75 |
* @param base the result for an empty array |
76 |
* @return this (to simplify use in expressions) |
77 |
*/ |
78 |
public abstract ParallelLongArrayWithBounds cumulate(LongReducer reducer, long base); |
79 |
|
80 |
/** |
81 |
* Replaces each element with the running sum. |
82 |
* @return this (to simplify use in expressions) |
83 |
*/ |
84 |
public abstract ParallelLongArrayWithBounds cumulateSum(); |
85 |
|
86 |
/** |
87 |
* Replaces each element with the cumulation of applying the given |
88 |
* reducer to all previous values, and returns the total |
89 |
* reduction. |
90 |
* @param reducer the reducer |
91 |
* @param base the result for an empty array |
92 |
* @return the total reduction |
93 |
*/ |
94 |
public abstract long precumulate(LongReducer reducer, long base); |
95 |
|
96 |
/** |
97 |
* Replaces each element with its prefix sum. |
98 |
* @return the total sum |
99 |
*/ |
100 |
public abstract long precumulateSum(); |
101 |
|
102 |
/** |
103 |
* Sorts the elements. |
104 |
* Unlike Arrays.sort, this sort does |
105 |
* not guarantee that elements with equal keys maintain their |
106 |
* relative position in the array. |
107 |
* @param cmp the comparator to use |
108 |
* @return this (to simplify use in expressions) |
109 |
*/ |
110 |
public abstract ParallelLongArrayWithBounds sort(LongComparator cmp); |
111 |
|
112 |
/** |
113 |
* Sorts the elements, assuming all elements are |
114 |
* Comparable. Unlike Arrays.sort, this sort does not |
115 |
* guarantee that elements with equal keys maintain their relative |
116 |
* position in the array. |
117 |
* @return this (to simplify use in expressions) |
118 |
* @throws ClassCastException if any element is not Comparable |
119 |
*/ |
120 |
public abstract ParallelLongArrayWithBounds sort(); |
121 |
|
122 |
} |