| /* |
| * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.utilities; |
| |
| /** Derived from the example in Section 15.3 of CLR. */ |
| |
| import java.util.Comparator; |
| |
| public class IntervalNode extends RBNode { |
| private Interval interval; |
| private Comparator endpointComparator; |
| private Object minEndpoint; |
| private Object maxEndpoint; |
| |
| public IntervalNode(Interval interval, Comparator endpointComparator, Object data) { |
| super(data); |
| this.interval = interval; |
| this.endpointComparator = endpointComparator; |
| } |
| |
| public void copyFrom(RBNode arg) { |
| IntervalNode argNode = (IntervalNode) arg; |
| this.interval = argNode.interval; |
| } |
| |
| public Interval getInterval() { |
| return interval; |
| } |
| |
| public Object getMinEndpoint() { |
| return minEndpoint; |
| } |
| |
| public Object getMaxEndpoint() { |
| return maxEndpoint; |
| } |
| |
| public boolean update() { |
| Object newMaxEndpoint = computeMaxEndpoint(); |
| Object newMinEndpoint = computeMinEndpoint(); |
| |
| if ((maxEndpoint != newMaxEndpoint) || (minEndpoint != newMinEndpoint)) { |
| maxEndpoint = newMaxEndpoint; |
| minEndpoint = newMinEndpoint; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| // Computes maximum endpoint without setting it in this node |
| public Object computeMinEndpoint() { |
| IntervalNode left = (IntervalNode) getLeft(); |
| if (left != null) { |
| return left.getMinEndpoint(); |
| } |
| return interval.getLowEndpoint(); |
| } |
| |
| // Computes maximum endpoint without setting it in this node |
| public Object computeMaxEndpoint() { |
| Object curMax = interval.getHighEndpoint(); |
| if (getLeft() != null) { |
| IntervalNode left = (IntervalNode) getLeft(); |
| if (endpointComparator.compare(left.getMaxEndpoint(), curMax) > 0) { |
| curMax = left.getMaxEndpoint(); |
| } |
| } |
| |
| if (getRight() != null) { |
| IntervalNode right = (IntervalNode) getRight(); |
| if (endpointComparator.compare(right.getMaxEndpoint(), curMax) > 0) { |
| curMax = right.getMaxEndpoint(); |
| } |
| } |
| return curMax; |
| } |
| |
| public String toString() { |
| String res = interval.toString(); |
| Object d = getData(); |
| if (d != null) { |
| res += " " + d; |
| } |
| return res; |
| } |
| } |