    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.CPInterfaceMethodRef;
    025import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
    026
    027/**
    028 * This class implements the byte code form for those bytecodes which have IMethod references (and only IMethod references).
    029 */
    030public class IMethodRefForm extends ReferenceForm {
    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 IMethodRefForm(final int opcode, final String name, final int[] rewrite) {
    040        super(opcode, name, rewrite);
    041    }
    042
    043    @Override
    044    protected int getOffset(final OperandManager operandManager) {
    045        return operandManager.nextIMethodRef();
    046    }
    047
    048    @Override
    049    protected int getPoolID() {
    050        return SegmentConstantPool.CP_IMETHOD;
    051    }
    052
    053    /*
    054     * (non-Javadoc)
    055     *
    056     * @see org.apache.commons.compress.harmony.unpack200.bytecode.forms.ByteCodeForm#setByteCodeOperands(org.apache.commons.
    057     * compress.harmony.unpack200.bytecode.ByteCode, org.apache.commons.compress.harmony.unpack200.bytecode.OperandTable,
    058     * org.apache.commons.compress.harmony.unpack200.Segment)
    059     */
    060    @Override
    061    public void setByteCodeOperands(final ByteCode byteCode, final OperandManager operandManager, final int codeLength) throws Pack200Exception {
    062        super.setByteCodeOperands(byteCode, operandManager, codeLength);
    063        final int count = ((CPInterfaceMethodRef) byteCode.getNestedClassFileEntries()[0]).invokeInterfaceCount();
    064        byteCode.getRewrite()[3] = count;
    065    }
    066}