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 *
017 */
018package org.apache.bcel.generic;
019
020import org.apache.bcel.classfile.ConstantPool;
021
022/**
023 * Super class for the GET/PUTxxx family of instructions.
024 *
025 * @version $Id: FieldInstruction.java 1747278 2016-06-07 17:28:43Z britter $
026 */
027public abstract class FieldInstruction extends FieldOrMethod {
028
029    /**
030     * Empty constructor needed for the Class.newInstance() statement in
031     * Instruction.readInstruction(). Not to be used otherwise.
032     */
033    FieldInstruction() {
034    }
035
036
037    /**
038     * @param index to constant pool
039     */
040    protected FieldInstruction(final short opcode, final int index) {
041        super(opcode, index);
042    }
043
044
045    /**
046     * @return mnemonic for instruction with symbolic references resolved
047     */
048    @Override
049    public String toString( final ConstantPool cp ) {
050        return org.apache.bcel.Const.getOpcodeName(super.getOpcode()) + " "
051                + cp.constantToString(super.getIndex(), org.apache.bcel.Const.CONSTANT_Fieldref);
052    }
053
054
055    /** @return size of field (1 or 2)
056     */
057    protected int getFieldSize( final ConstantPoolGen cpg ) {
058        return Type.size(Type.getTypeSize(getSignature(cpg)));
059    }
060
061
062    /** @return return type of referenced field
063     */
064    @Override
065    public Type getType( final ConstantPoolGen cpg ) {
066        return getFieldType(cpg);
067    }
068
069
070    /** @return type of field
071     */
072    public Type getFieldType( final ConstantPoolGen cpg ) {
073        return Type.getType(getSignature(cpg));
074    }
075
076
077    /** @return name of referenced field.
078     */
079    public String getFieldName( final ConstantPoolGen cpg ) {
080        return getName(cpg);
081    }
082}