Mercurial > hg > openjdk > jdk9 > jaxp
view src/java.xml/share/classes/com/sun/org/apache/bcel/internal/generic/InstructionComparator.java @ 1113:2fdbfbde3bc0
8162572: Update License Header for all JAXP sources
Reviewed-by: lancea
author | joehw |
---|---|
date | Mon, 17 Apr 2017 16:24:10 -0700 |
parents | 2bfaf29cc90b |
children |
line wrap: on
line source
/* * reserved comment block * DO NOT REMOVE OR ALTER! */ /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.sun.org.apache.bcel.internal.generic; /** * Equality of instructions isn't clearly to be defined. You might * wish, for example, to compare whether instructions have the same * meaning. E.g., whether two INVOKEVIRTUALs describe the same * call.<br>The DEFAULT comparator however, considers two instructions * to be equal if they have same opcode and point to the same indexes * (if any) in the constant pool or the same local variable index. Branch * instructions must have the same target. * * @see Instruction * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> */ public interface InstructionComparator { public static final InstructionComparator DEFAULT = new InstructionComparator() { public boolean equals(Instruction i1, Instruction i2) { if(i1.opcode == i2.opcode) { if(i1 instanceof Select) { InstructionHandle[] t1 = ((Select)i1).getTargets(); InstructionHandle[] t2 = ((Select)i2).getTargets(); if(t1.length == t2.length) { for(int i = 0; i < t1.length; i++) { if(t1[i] != t2[i]) { return false; } } return true; } } else if(i1 instanceof BranchInstruction) { return ((BranchInstruction)i1).target == ((BranchInstruction)i2).target; } else if(i1 instanceof ConstantPushInstruction) { return ((ConstantPushInstruction)i1).getValue(). equals(((ConstantPushInstruction)i2).getValue()); } else if(i1 instanceof IndexedInstruction) { return ((IndexedInstruction)i1).getIndex() == ((IndexedInstruction)i2).getIndex(); } else if(i1 instanceof NEWARRAY) { return ((NEWARRAY)i1).getTypecode() == ((NEWARRAY)i2).getTypecode(); } else { return true; } } return false; } }; public boolean equals(Instruction i1, Instruction i2); }