001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.compress.harmony.unpack200.bytecode.forms; 018 019import org.apache.commons.compress.harmony.pack200.Pack200Exception; 020import org.apache.commons.compress.harmony.unpack200.SegmentConstantPool; 021import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode; 022import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry; 023import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager; 024 025/** 026 * This class implements the byte code form for those bytecodes which have class references (and only class references). 027 */ 028public class ClassRefForm extends ReferenceForm { 029 030 protected boolean widened; 031 032 public ClassRefForm(final int opcode, final String name, final int[] rewrite) { 033 super(opcode, name, rewrite); 034 } 035 036 public ClassRefForm(final int opcode, final String name, final int[] rewrite, final boolean widened) { 037 this(opcode, name, rewrite); 038 this.widened = widened; 039 } 040 041 @Override 042 protected int getOffset(final OperandManager operandManager) { 043 return operandManager.nextClassRef(); 044 } 045 046 @Override 047 protected int getPoolID() { 048 return SegmentConstantPool.CP_CLASS; 049 } 050 051 @Override 052 protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception { 053 // If the offset is not zero, proceed normally. 054 if (offset != 0) { 055 super.setNestedEntries(byteCode, operandManager, offset - 1); 056 return; 057 } 058 // If the offset is 0, ClassRefForms refer to 059 // the current class. Add that as the nested class. 060 // (This is true for all bc_classref forms in 061 // the spec except for multianewarray, which has 062 // its own form.) 063 final SegmentConstantPool globalPool = operandManager.globalConstantPool(); 064 // How do I get this class? 065 final ClassFileEntry[] nested = { globalPool.getClassPoolEntry(operandManager.getCurrentClass()) }; 066 byteCode.setNested(nested); 067 byteCode.setNestedPositions(new int[][] { { 0, 2 } }); 068 } 069}