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 * Abstract superclass of all classes that have class-specific references to constant pool information. These classes
027 * have a context (a string representing a pack200 class) i.e., they send getClassSpecificPoolEntry instead of
028 * getConstantPoolEntry.
029 */
030public abstract class ClassSpecificReferenceForm extends ReferenceForm {
031
032    public ClassSpecificReferenceForm(final int opcode, final String name, final int[] rewrite) {
033        super(opcode, name, rewrite);
034    }
035
036    protected abstract String context(OperandManager operandManager);
037
038    @Override
039    protected abstract int getOffset(OperandManager operandManager);
040
041    @Override
042    protected abstract int getPoolID();
043
044    @Override
045    protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset)
046        throws Pack200Exception {
047        final SegmentConstantPool globalPool = operandManager.globalConstantPool();
048        ClassFileEntry[] nested = new ClassFileEntry[] {
049            globalPool.getClassSpecificPoolEntry(getPoolID(), offset, context(operandManager))};
050        byteCode.setNested(nested);
051        byteCode.setNestedPositions(new int[][] {{0, 2}});
052    }
053
054}