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1 /*
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2 * Copyright 2000-2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.utilities;
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26
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27 /** Derived from the example in Section 15.3 of CLR. */
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28
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29 import java.util.Comparator;
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30
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31 public class IntervalNode extends RBNode {
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32 private Interval interval;
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33 private Comparator endpointComparator;
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34 private Object minEndpoint;
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35 private Object maxEndpoint;
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36
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37 public IntervalNode(Interval interval, Comparator endpointComparator, Object data) {
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38 super(data);
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39 this.interval = interval;
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40 this.endpointComparator = endpointComparator;
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41 }
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42
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43 public void copyFrom(RBNode arg) {
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44 IntervalNode argNode = (IntervalNode) arg;
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45 this.interval = argNode.interval;
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46 }
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47
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48 public Interval getInterval() {
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49 return interval;
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50 }
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51
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52 public Object getMinEndpoint() {
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53 return minEndpoint;
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54 }
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55
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56 public Object getMaxEndpoint() {
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57 return maxEndpoint;
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58 }
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59
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60 public boolean update() {
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61 Object newMaxEndpoint = computeMaxEndpoint();
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62 Object newMinEndpoint = computeMinEndpoint();
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63
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64 if ((maxEndpoint != newMaxEndpoint) || (minEndpoint != newMinEndpoint)) {
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65 maxEndpoint = newMaxEndpoint;
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66 minEndpoint = newMinEndpoint;
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67 return true;
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68 }
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69
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70 return false;
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71 }
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72
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73 // Computes maximum endpoint without setting it in this node
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74 public Object computeMinEndpoint() {
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75 IntervalNode left = (IntervalNode) getLeft();
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76 if (left != null) {
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77 return left.getMinEndpoint();
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78 }
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79 return interval.getLowEndpoint();
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80 }
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81
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82 // Computes maximum endpoint without setting it in this node
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83 public Object computeMaxEndpoint() {
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84 Object curMax = interval.getHighEndpoint();
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85 if (getLeft() != null) {
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86 IntervalNode left = (IntervalNode) getLeft();
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87 if (endpointComparator.compare(left.getMaxEndpoint(), curMax) > 0) {
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88 curMax = left.getMaxEndpoint();
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89 }
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90 }
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91
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92 if (getRight() != null) {
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93 IntervalNode right = (IntervalNode) getRight();
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94 if (endpointComparator.compare(right.getMaxEndpoint(), curMax) > 0) {
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95 curMax = right.getMaxEndpoint();
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96 }
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97 }
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98 return curMax;
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99 }
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100
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101 public String toString() {
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102 String res = interval.toString();
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103 Object d = getData();
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104 if (d != null) {
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105 res += " " + d;
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106 }
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107 return res;
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108 }
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109 }
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