    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.CPClass;
    023import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry;
    024import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
    025
    026/**
    027 * This class is an extension of the ClassRefForm. It has two purposes: 1. To keep track of the last type used in a new() instruction in the current class. 2.
    028 * To allow the sender to create instances of either a specified class (which then becomes the new class) or the last used new class.
    029 */
    030public class NewClassRefForm extends ClassRefForm {
    031
    032    public NewClassRefForm(final int opcode, final String name, final int[] rewrite) {
    033        super(opcode, name, rewrite);
    034    }
    035
    036    /*
    037     * (non-Javadoc)
    038     *
    039     * @see org.apache.commons.compress.harmony.unpack200.bytecode.forms.ReferenceForm#setByteCodeOperands(org.apache.commons
    040     * .compress.harmony.unpack200.bytecode.ByteCode, org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager)
    041     */
    042    @Override
    043    public void setByteCodeOperands(final ByteCode byteCode, final OperandManager operandManager, final int codeLength) {
    044        final int offset = getOffset(operandManager);
    045        if (offset == 0) {
    046            // Use current class
    047            final SegmentConstantPool globalPool = operandManager.globalConstantPool();
    048            final ClassFileEntry[] nested = { globalPool.getClassPoolEntry(operandManager.getCurrentClass()) };
    049            byteCode.setNested(nested);
    050            byteCode.setNestedPositions(new int[][] { { 0, 2 } });
    051        } else {
    052            // Look up the class in the classpool
    053            try {
    054                // Parent takes care of subtracting one from offset
    055                // to adjust for 1-based global pool
    056                setNestedEntries(byteCode, operandManager, offset);
    057            } catch (final Pack200Exception ex) {
    058                throw new Error("Got a pack200 exception. What to do?");
    059            }
    060        }
    061        operandManager.setNewClass(((CPClass) byteCode.getNestedClassFileEntries()[0]).getName());
    062    }
    063}