1 /* 2 * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved. 3 * 4 * This file is part of the Lock Contention Tracing Subsystem for the HotSpot 5 * Virtual Machine, which is developed at Christian Doppler Laboratory on 6 * Monitoring and Evolution of Very-Large-Scale Software Systems. Please 7 * contact us at <http://mevss.jku.at/> if you need additional information 8 * or have any questions. 9 * 10 * This code is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License version 2 only, as 12 * published by the Free Software Foundation. 13 * 14 * This code is distributed in the hope that it will be useful, but WITHOUT 15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 17 * version 2 for more details (a copy is included in the LICENSE file that 18 * accompanied this code). 19 * 20 * You should have received a copy of the GNU General Public License version 21 * 2 along with this work. If not, see <http://www.gnu.org/licenses/>. 22 * 23 */ 24 package sun.evtracing.processing.statistics.metadata; 25 26 import java.util.Arrays; 27 28 public abstract class JavaObjectStack { 29 30 public static final JavaObjectStack HIDDEN = new JavaObjectArrayStack(0) { 31 @Override 32 public boolean equals(Object obj) { 33 return (this == obj); 34 } 35 }; 36 37 public abstract JavaObject top(); 38 39 public abstract JavaObject[] objects(); 40 41 public abstract void setObject(int number, JavaObject obj); 42 43 public abstract JavaClassStack getClassStack(); 44 45 @Override 46 public int hashCode() { 47 return Arrays.hashCode(objects()); 48 } 49 50 @Override 51 public boolean equals(Object obj) { 52 if (this == obj) { 53 return true; 54 } 55 if (obj instanceof JavaObjectStack) { 56 JavaObjectStack other = (JavaObjectStack) obj; 57 return Arrays.equals(objects(), other.objects()); 58 } 59 return false; 60 } 61 }