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.CPString; 023import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry; 024import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager; 025 026/** 027 * This class implements the byte code form for those bytecodes which have string references (and only string 028 * references). 029 */ 030public class StringRefForm extends SingleByteReferenceForm { 031 032 public StringRefForm(final int opcode, final String name, final int[] rewrite) { 033 super(opcode, name, rewrite); 034 } 035 036 public StringRefForm(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.nextStringRef(); 044 } 045 046 @Override 047 protected int getPoolID() { 048 return SegmentConstantPool.CP_STRING; 049 } 050 051 @Override 052 protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) 053 throws Pack200Exception { 054 final SegmentConstantPool globalPool = operandManager.globalConstantPool(); 055 ClassFileEntry[] nested = null; 056 nested = new ClassFileEntry[] {((CPString) globalPool.getValue(getPoolID(), offset))}; 057 byteCode.setNested(nested); 058 if (widened) { 059 byteCode.setNestedPositions(new int[][] {{0, 2}}); 060 } else { 061 byteCode.setNestedPositions(new int[][] {{0, 1}}); 062 } 063 } 064}