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annotate graal/com.oracle.max.base/src/com/sun/max/collect/SortedLongArrayMapping.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.collect;
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24
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25 import com.sun.max.*;
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26
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27 /**
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28 * Two arrays: one holding sorted long keys,
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29 * the parallel other one holding lookup values corresponding to those keys.
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30 * Insertion/deletion moderately costly, lookup by binary search pretty fast.
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31 */
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32 public class SortedLongArrayMapping<V> {
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33
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34 public SortedLongArrayMapping() {
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35 }
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36
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37 private long[] keys = {};
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38 private Object[] values = {};
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39
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40 private int findIndex(long key) {
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41 int left = 0;
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42 int right = keys.length;
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43 while (right > left) {
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44 final int middle = left + ((right - left) >> 1);
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45 final long middleKey = keys[middle];
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46 if (middleKey == key) {
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47 return middle;
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48 } else if (middleKey > key) {
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49 right = middle;
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50 } else {
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51 left = middle + 1;
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52 }
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53 }
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54 return left;
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55 }
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56
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57 /**
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58 * Binary search in the key array.
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59 * @return the value corresponding to the key or null if the key is not found
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60 */
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61 public V get(long key) {
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62 final int index = findIndex(key);
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63 if (index < keys.length && keys[index] == key) {
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64 final Class<V> type = null;
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65 return Utils.cast(type, values[index]);
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66 }
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67 return null;
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68 }
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69
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70 public void put(long key, V value) {
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71 final int index = findIndex(key);
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72 if (index < keys.length && keys[index] == key) {
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73 values[index] = value;
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74 } else {
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75 long[] newKeys = new long[keys.length + 1];
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76 System.arraycopy(keys, 0, newKeys, 0, index);
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77 System.arraycopy(keys, index, newKeys, index + 1, keys.length - index);
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78 newKeys[index] = key;
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79 keys = newKeys;
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80
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81 Object[] newValues = new Object[values.length + 1];
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82 System.arraycopy(values, 0, newValues, 0, index);
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83 System.arraycopy(values, index, newValues, index + 1, values.length - index);
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84 newValues[index] = value;
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85 values = newValues;
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86 }
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87 }
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88
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89 public void remove(long key) {
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90 final int index = findIndex(key);
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91 if (keys[index] == key) {
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92 int newLength = keys.length - 1;
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93 long[] newKeys = new long[newLength];
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94 System.arraycopy(keys, 0, newKeys, 0, index);
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95 System.arraycopy(keys, index + 1, newKeys, index, newLength - index);
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96 keys = newKeys;
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97
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98 Object[] newValues = new Object[newLength];
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99 System.arraycopy(values, 0, newValues, 0, index);
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100 System.arraycopy(values, index + 1, newValues, index, newLength - index);
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101 values = newValues;
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102 }
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103 }
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104 }