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.ConstantCP;
021import org.apache.bcel.classfile.ConstantNameAndType;
022import org.apache.bcel.classfile.ConstantPool;
023import org.apache.bcel.classfile.ConstantUtf8;
024
025/**
026 * Super class for FieldOrMethod and INVOKEDYNAMIC, since they both have names and signatures
027 *
028 * @since 6.0
029 */
030public abstract class NameSignatureInstruction extends CPInstruction {
031
032    public NameSignatureInstruction() {
033    }
034
035    public NameSignatureInstruction(final short opcode, final int index) {
036        super(opcode, index);
037    }
038
039    /**
040     * @return name of referenced method/field.
041     */
042    public String getName(final ConstantPoolGen cpg) {
043        final ConstantPool cp = cpg.getConstantPool();
044        final ConstantNameAndType cnat = getNameAndType(cpg);
045        return ((ConstantUtf8) cp.getConstant(cnat.getNameIndex())).getBytes();
046    }
047
048    public ConstantNameAndType getNameAndType(final ConstantPoolGen cpg) {
049        final ConstantPool cp = cpg.getConstantPool();
050        final ConstantCP cmr = (ConstantCP) cp.getConstant(super.getIndex());
051        return (ConstantNameAndType) cp.getConstant(cmr.getNameAndTypeIndex());
052    }
053
054    /**
055     * @return signature of referenced method/field.
056     */
057    public String getSignature(final ConstantPoolGen cpg) {
058        final ConstantPool cp = cpg.getConstantPool();
059        final ConstantNameAndType cnat = getNameAndType(cpg);
060        return ((ConstantUtf8) cp.getConstant(cnat.getSignatureIndex())).getBytes();
061    }
062
063}