    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 *   https://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019package org.apache.commons.compress.harmony.unpack200.bytecode.forms;
    020
    021import org.apache.commons.compress.harmony.pack200.Pack200Exception;
    022import org.apache.commons.compress.harmony.unpack200.SegmentConstantPool;
    023import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode;
    024import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry;
    025import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
    026
    027/**
    028 * Abstract superclass of those classes which look up init methods (these are class specific methods). They use getInitMethodPoolEntry to find the methods.
    029 */
    030public abstract class InitMethodReferenceForm extends ClassSpecificReferenceForm {
    031
    032    /**
    033     * Constructs a new instance with the specified opcode, name, operandType and rewrite.
    034     *
    035     * @param opcode  index corresponding to the opcode's value.
    036     * @param name    String printable name of the opcode.
    037     * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
    038     */
    039    public InitMethodReferenceForm(final int opcode, final String name, final int[] rewrite) {
    040        super(opcode, name, rewrite);
    041    }
    042
    043    @Override
    044    protected abstract String context(OperandManager operandManager);
    045
    046    @Override
    047    protected int getOffset(final OperandManager operandManager) {
    048        return operandManager.nextInitRef();
    049    }
    050
    051    @Override
    052    protected int getPoolID() {
    053        return SegmentConstantPool.CP_METHOD;
    054    }
    055
    056    @Override
    057    protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception {
    058        final SegmentConstantPool globalPool = operandManager.globalConstantPool();
    059        final ClassFileEntry[] nested = { globalPool.getInitMethodPoolEntry(SegmentConstantPool.CP_METHOD, offset, context(operandManager)) };
    060        byteCode.setNested(nested);
    061        byteCode.setNestedPositions(new int[][] { { 0, 2 } });
    062    }
    063}