    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.unpack200.SegmentConstantPool;
    022import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
    023
    024/**
    025 * This class implements references to fields defined in the current class, which is set by this class in the OperandManager. Pack200 allows the current class
    026 * to be inferred from context; this class tracks previous field reference classes to allow this.
    027 */
    028public class ThisFieldRefForm extends ClassSpecificReferenceForm {
    029
    030    /**
    031     * Constructs a new instance with the specified opcode, name, operandType and rewrite.
    032     *
    033     * @param opcode  index corresponding to the opcode's value.
    034     * @param name    String printable name of the opcode.
    035     * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
    036     */
    037    public ThisFieldRefForm(final int opcode, final String name, final int[] rewrite) {
    038        super(opcode, name, rewrite);
    039    }
    040
    041    @Override
    042    protected String context(final OperandManager operandManager) {
    043        return operandManager.getCurrentClass();
    044    }
    045
    046    @Override
    047    protected int getOffset(final OperandManager operandManager) {
    048        return operandManager.nextThisFieldRef();
    049    }
    050
    051    @Override
    052    protected int getPoolID() {
    053        return SegmentConstantPool.CP_FIELD;
    054    }
    055}