    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
    028 * new() instruction in the current class. 2. To allow the sender to create instances of either a specified class (which
    029 * then becomes the new class) or the last used new class.
    030 */
    031public class NewClassRefForm extends ClassRefForm {
    032
    033    public NewClassRefForm(final int opcode, final String name, final int[] rewrite) {
    034        super(opcode, name, rewrite);
    035    }
    036
    037    /*
    038     * (non-Javadoc)
    039     *
    040     * @see
    041     * org.apache.commons.compress.harmony.unpack200.bytecode.forms.ReferenceForm#setByteCodeOperands(org.apache.commons
    042     * .compress.harmony.unpack200.bytecode.ByteCode,
    043     * org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager)
    044     */
    045    @Override
    046    public void setByteCodeOperands(final ByteCode byteCode, final OperandManager operandManager,
    047        final int codeLength) {
    048        ClassFileEntry[] nested = null;
    049        final int offset = getOffset(operandManager);
    050        if (offset == 0) {
    051            // Use current class
    052            final SegmentConstantPool globalPool = operandManager.globalConstantPool();
    053            nested = new ClassFileEntry[] {globalPool.getClassPoolEntry(operandManager.getCurrentClass())};
    054            byteCode.setNested(nested);
    055            byteCode.setNestedPositions(new int[][] {{0, 2}});
    056        } else {
    057            // Look up the class in the classpool
    058            try {
    059                // Parent takes care of subtracting one from offset
    060                // to adjust for 1-based global pool
    061                setNestedEntries(byteCode, operandManager, offset);
    062            } catch (final Pack200Exception ex) {
    063                throw new Error("Got a pack200 exception. What to do?");
    064            }
    065        }
    066        operandManager.setNewClass(((CPClass) byteCode.getNestedClassFileEntries()[0]).getName());
    067    }
    068}