Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/ArrayHelper.java @ 685:9897cbfd2790

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Towards ssh remote repositories: use ganymed library for ssh transport
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 25 Jul 2013 21:32:09 +0200
parents f568330dd9c0
children
rev   line source
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
1 /*
682
f568330dd9c0 Compile with Java5, ensure generics are fine for other compilers, too
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 658
diff changeset
2 * Copyright (c) 2011-2013 TMate Software Ltd
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
3 *
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
4 * This program is free software; you can redistribute it and/or modify
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
5 * it under the terms of the GNU General Public License as published by
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
6 * the Free Software Foundation; version 2 of the License.
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
7 *
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
8 * This program is distributed in the hope that it will be useful,
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
11 * GNU General Public License for more details.
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
12 *
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
13 * For information on how to redistribute this software under
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
14 * the terms of a license other than GNU General Public License
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
15 * contact TMate Software at support@hg4j.com
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
16 */
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
17 package org.tmatesoft.hg.internal;
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
18
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
19 import java.util.Arrays;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
20
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
21 /**
311
b9592e21176a Tests for array sort and reverse index building helper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 310
diff changeset
22 * Internal alternative to Arrays.sort to build reversed index along with sorting
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
23 * and to perform lookup (binary search) without sorted array, using reversed index.
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
24 *
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
25 * @author Artem Tikhomirov
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
26 * @author TMate Software Ltd.
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
27 */
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
28 public final class ArrayHelper<T extends Comparable<T>> {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
29 private int[] reverse; // aka sorted2natural
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
30 private final T[] data;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
31 private T[] sorted;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
32
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
33 public ArrayHelper(T[] _data) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
34 assert _data != null;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
35 data = _data;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
36 }
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
37
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
38 /**
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
39 * Sort data this helper wraps, possibly using supplied array (optional)
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
40 * to keep sorted elements
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
41 * @param sortDest array to keep sorted values at, or <code>null</code>
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
42 * @param sortDestIsEmpty <code>false</code> when sortDest already contains copy of data to be sorted
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
43 * @param keepSorted <code>true</code> to save sorted array for future use (e.g. in
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
44 */
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
45 public void sort(T[] sortDest, boolean sortDestIsEmpty, boolean keepSorted) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
46 if (sortDest != null) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
47 assert sortDest.length >= data.length;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
48 if (sortDestIsEmpty) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
49 System.arraycopy(data, 0, sortDest, 0, data.length);
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
50 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
51 sorted = sortDest;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
52 } else {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
53 sorted = data.clone();
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
54 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
55 reverse = new int[data.length];
310
237de162be28 Fix building sort reverse array when element was initially in correct position.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 307
diff changeset
56 for (int i = 0; i < reverse.length; i++) {
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
57 // initial reverse indexes, so that elements that do
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
58 // not move during sort got correct indexes
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
59 reverse[i] = i;
310
237de162be28 Fix building sort reverse array when element was initially in correct position.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 307
diff changeset
60 }
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
61 sort1(0, data.length);
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
62 if (!keepSorted) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
63 sorted = null;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
64 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
65 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
66
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
67 /**
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
68 * @return all reverse indexes
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
69 */
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
70 public int[] getReverseIndexes() {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
71 return reverse;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
72 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
73
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
74 public int getReverseIndex(int sortedIndex) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
75 return reverse[sortedIndex];
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
76 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
77
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
78 public T get(int index) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
79 return data[index];
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
80 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
81
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
82 public T[] getData() {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
83 return data;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
84 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
85
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
86 /**
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
87 * Look up sorted index of the value, using sort information
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
88 * @return same value as {@link Arrays#binarySearch(Object[], Object)} does
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
89 */
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
90 public int binarySearchSorted(T value) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
91 if (sorted != null) {
682
f568330dd9c0 Compile with Java5, ensure generics are fine for other compilers, too
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 658
diff changeset
92 int x = Arrays.binarySearch(sorted, value);
f568330dd9c0 Compile with Java5, ensure generics are fine for other compilers, too
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 658
diff changeset
93 // fulfill the Arrays#binarySearch contract in case sorted array is greater than data
f568330dd9c0 Compile with Java5, ensure generics are fine for other compilers, too
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 658
diff changeset
94 return x >= data.length ? -(data.length - 1) : x;
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
95 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
96 return binarySearchWithReverse(0, data.length, value);
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
97 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
98
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
99 /**
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
100 * Look up index of the value in the original array.
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
101 * @return index in original data, or <code>defaultValue</code> if value not found
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
102 */
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
103 public int binarySearch(T value, int defaultValue) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
104 int x = binarySearchSorted(value);
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
105 if (x < 0) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
106 return defaultValue;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
107 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
108 return reverse[x];
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
109 }
311
b9592e21176a Tests for array sort and reverse index building helper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 310
diff changeset
110
b9592e21176a Tests for array sort and reverse index building helper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 310
diff changeset
111 /**
b9592e21176a Tests for array sort and reverse index building helper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 310
diff changeset
112 * Slightly modified version of Arrays.sort1(int[], int, int) quicksort alg (just to deal with Object[])
b9592e21176a Tests for array sort and reverse index building helper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 310
diff changeset
113 */
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
114 private void sort1(int off, int len) {
658
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
115 Comparable<Object>[] x = comparableSorted();
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
116 // Insertion sort on smallest arrays
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
117 if (len < 7) {
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
118 for (int i=off; i<len+off; i++)
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
119 for (int j=i; j>off && x[j-1].compareTo(x[j]) > 0; j--)
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
120 swap(j, j-1);
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
121 return;
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
122 }
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
123
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
124 // Choose a partition element, v
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
125 int m = off + (len >> 1); // Small arrays, middle element
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
126 if (len > 7) {
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
127 int l = off;
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
128 int n = off + len - 1;
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
129 if (len > 40) { // Big arrays, pseudomedian of 9
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
130 int s = len/8;
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
131 l = med3(l, l+s, l+2*s);
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
132 m = med3(m-s, m, m+s);
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
133 n = med3(n-2*s, n-s, n);
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
134 }
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
135 m = med3(l, m, n); // Mid-size, med of 3
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
136 }
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
137 Comparable<Object> v = x[m];
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
138
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
139 // Establish Invariant: v* (<v)* (>v)* v*
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
140 int a = off, b = a, c = off + len - 1, d = c;
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
141 while(true) {
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
142 while (b <= c && x[b].compareTo(v) <= 0) {
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
143 if (x[b] == v)
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
144 swap(a++, b);
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
145 b++;
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
146 }
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
147 while (c >= b && x[c].compareTo(v) >= 0) {
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
148 if (x[c] == v)
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
149 swap(c, d--);
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
150 c--;
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
151 }
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
152 if (b > c)
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
153 break;
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
154 swap(b++, c--);
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
155 }
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
156
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
157 // Swap partition elements back to middle
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
158 int s, n = off + len;
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
159 s = Math.min(a-off, b-a ); vecswap(off, b-s, s);
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
160 s = Math.min(d-c, n-d-1); vecswap(b, n-s, s);
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
161
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
162 // Recursively sort non-partition-elements
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
163 if ((s = b-a) > 1)
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
164 sort1(off, s);
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
165 if ((s = d-c) > 1)
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
166 sort1(n-s, s);
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
167 }
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
168
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
169 /**
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
170 * Swaps x[a .. (a+n-1)] with x[b .. (b+n-1)].
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
171 */
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
172 private void vecswap(int a, int b, int n) {
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
173 for (int i=0; i<n; i++, a++, b++) {
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
174 swap(a, b);
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
175 }
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
176 }
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
177
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
178 /**
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
179 * Returns the index of the median of the three indexed integers.
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
180 */
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
181 private int med3(int a, int b, int c) {
658
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
182 Comparable<Object>[] x = comparableSorted();
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
183 return (x[a].compareTo(x[b]) < 0 ?
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
184 (x[b].compareTo(x[c]) < 0 ? b : x[a].compareTo(x[c]) < 0 ? c : a) :
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
185 (x[b].compareTo(x[c]) > 0 ? b : x[a].compareTo(x[c]) > 0 ? c : a));
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
186 }
658
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
187
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
188 private Comparable<Object>[] comparableSorted() {
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
189 // Comparable<Object>[] x = (Comparable<Object>[]) sorted
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
190 // eclipse compiler is ok with the line above, while javac doesn't understand it:
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
191 // inconvertible types found : T[] required: java.lang.Comparable<java.lang.Object>[]
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
192 // so need to add another step
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
193 Comparable<?>[] oo = sorted;
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
194 @SuppressWarnings("unchecked")
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
195 Comparable<Object>[] x = (Comparable<Object>[]) oo;
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
196 return x;
d10399f80f4e javac complained about casts, while eclipse compiler is fine
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 657
diff changeset
197 }
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
198
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
199 /**
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
200 * Swaps x[a] with x[b].
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
201 */
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
202 private void swap(int a, int b) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
203 Object[] x = sorted;
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
204 Object t = x[a];
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
205 x[a] = x[b];
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
206 x[b] = t;
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
207 int z1 = reverse[a];
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
208 int z2 = reverse[b];
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
209 reverse[b] = z1;
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
210 reverse[a] = z2;
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
211 }
657
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
212
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
213 // copied from Arrays.binarySearch0, update to be instance method and to use reverse indexes
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
214 private int binarySearchWithReverse(int fromIndex, int toIndex, T key) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
215 int low = fromIndex;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
216 int high = toIndex - 1;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
217
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
218 while (low <= high) {
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
219 int mid = (low + high) >>> 1;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
220 // data[reverse[x]] gives sorted value at index x
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
221 T midVal = data[reverse[mid]];
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
222 int cmp = midVal.compareTo(key);
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
223
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
224 if (cmp < 0)
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
225 low = mid + 1;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
226 else if (cmp > 0)
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
227 high = mid - 1;
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
228 else
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
229 return mid; // key found
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
230 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
231 return -(low + 1); // key not found.
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
232 }
6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 311
diff changeset
233
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
234 }