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.bytecode.ByteCode; 021import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager; 022 023/** 024 * Some bytecodes (such as (a)ldc, fldc and ildc) have single-byte references to the class pool. This class is the abstract superclass of those classes. 025 */ 026public abstract class SingleByteReferenceForm extends ReferenceForm { 027 028 protected boolean widened; 029 030 public SingleByteReferenceForm(final int opcode, final String name, final int[] rewrite) { 031 super(opcode, name, rewrite); 032 } 033 034 @Override 035 protected abstract int getOffset(OperandManager operandManager); 036 037 @Override 038 protected abstract int getPoolID(); 039 040 @Override 041 public boolean nestedMustStartClassPool() { 042 return !widened; 043 } 044 045 @Override 046 protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception { 047 super.setNestedEntries(byteCode, operandManager, offset); 048 if (widened) { 049 byteCode.setNestedPositions(new int[][] { { 0, 2 } }); 050 } else { 051 byteCode.setNestedPositions(new int[][] { { 0, 1 } }); 052 } 053 } 054}