View Javadoc
1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   */
17  
18  package org.apache.bcel.generic;
19  
20  import org.apache.bcel.classfile.ConstantCP;
21  import org.apache.bcel.classfile.ConstantNameAndType;
22  import org.apache.bcel.classfile.ConstantPool;
23  import org.apache.bcel.classfile.ConstantUtf8;
24  
25  /**
26   * Super class for FieldOrMethod and INVOKEDYNAMIC, since they both have
27   * names and signatures
28   *
29   * @version $Id: NameSignatureInstruction.html 1018313 2017-09-18 09:03:04Z britter $
30   * @since 6.0
31   */
32  public abstract class NameSignatureInstruction extends CPInstruction {
33  
34      public NameSignatureInstruction() {
35          super();
36      }
37  
38      public NameSignatureInstruction(final short opcode, final int index) {
39          super(opcode, index);
40      }
41  
42      public ConstantNameAndType getNameAndType(final ConstantPoolGen cpg) {
43          final ConstantPool cp = cpg.getConstantPool();
44          final ConstantCP cmr = (ConstantCP) cp.getConstant(super.getIndex());
45          return  (ConstantNameAndType) cp.getConstant(cmr.getNameAndTypeIndex());
46      }
47      /** @return signature of referenced method/field.
48       */
49      public String getSignature(final ConstantPoolGen cpg) {
50          final ConstantPool cp = cpg.getConstantPool();
51          final ConstantNameAndType cnat = getNameAndType(cpg);
52          return ((ConstantUtf8) cp.getConstant(cnat.getSignatureIndex())).getBytes();
53      }
54  
55      /** @return name of referenced method/field.
56       */
57      public String getName(final ConstantPoolGen cpg) {
58          final ConstantPool cp = cpg.getConstantPool();
59          final ConstantNameAndType cnat = getNameAndType(cpg);
60          return ((ConstantUtf8) cp.getConstant(cnat.getNameIndex())).getBytes();
61      }
62  
63  }