    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)
    053        throws Pack200Exception {
    054        // If the offset is not zero, proceed normally.
    055        if (offset != 0) {
    056            super.setNestedEntries(byteCode, operandManager, offset - 1);
    057            return;
    058        }
    059        // If the offset is 0, ClassRefForms refer to
    060        // the current class. Add that as the nested class.
    061        // (This is true for all bc_classref forms in
    062        // the spec except for multianewarray, which has
    063        // its own form.)
    064        final SegmentConstantPool globalPool = operandManager.globalConstantPool();
    065        ClassFileEntry[] nested = null;
    066        // How do I get this class?
    067        nested = new ClassFileEntry[] {globalPool.getClassPoolEntry(operandManager.getCurrentClass())};
    068        byteCode.setNested(nested);
    069        byteCode.setNestedPositions(new int[][] {{0, 2}});
    070    }
    071}