    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 all classes that have class-specific references to constant pool information. These classes have a context (a string representing a
    029 * pack200 class) i.e., they send getClassSpecificPoolEntry instead of getConstantPoolEntry.
    030 */
    031public abstract class ClassSpecificReferenceForm extends ReferenceForm {
    032
    033    /**
    034     * Constructs a new instance with the specified opcode, name, operandType and rewrite.
    035     *
    036     * @param opcode  index corresponding to the opcode's value.
    037     * @param name    String printable name of the opcode.
    038     * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
    039     */
    040    public ClassSpecificReferenceForm(final int opcode, final String name, final int[] rewrite) {
    041        super(opcode, name, rewrite);
    042    }
    043
    044    protected abstract String context(OperandManager operandManager);
    045
    046    @Override
    047    protected abstract int getOffset(OperandManager operandManager);
    048
    049    @Override
    050    protected abstract int getPoolID();
    051
    052    @Override
    053    protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception {
    054        final SegmentConstantPool globalPool = operandManager.globalConstantPool();
    055        final ClassFileEntry[] nested = { globalPool.getClassSpecificPoolEntry(getPoolID(), offset, context(operandManager)) };
    056        byteCode.setNested(nested);
    057        byteCode.setNestedPositions(new int[][] { { 0, 2 } });
    058    }
    059
    060}