View Javadoc
1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   https://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  
20  package org.apache.bcel.generic;
21  
22  import org.apache.bcel.classfile.ConstantCP;
23  import org.apache.bcel.classfile.ConstantNameAndType;
24  import org.apache.bcel.classfile.ConstantPool;
25  import org.apache.bcel.classfile.ConstantUtf8;
26  
27  /**
28   * Super class for FieldOrMethod and INVOKEDYNAMIC, since they both have names and signatures
29   *
30   * @since 6.0
31   */
32  public abstract class NameSignatureInstruction extends CPInstruction {
33  
34      public NameSignatureInstruction() {
35      }
36  
37      public NameSignatureInstruction(final short opcode, final int index) {
38          super(opcode, index);
39      }
40  
41      /**
42       * @return name of referenced method/field.
43       */
44      public String getName(final ConstantPoolGen cpg) {
45          final ConstantPool cp = cpg.getConstantPool();
46          final ConstantNameAndType cnat = getNameAndType(cpg);
47          return ((ConstantUtf8) cp.getConstant(cnat.getNameIndex())).getBytes();
48      }
49  
50      public ConstantNameAndType getNameAndType(final ConstantPoolGen cpg) {
51          final ConstantPool cp = cpg.getConstantPool();
52          final ConstantCP cmr = (ConstantCP) cp.getConstant(super.getIndex());
53          return (ConstantNameAndType) cp.getConstant(cmr.getNameAndTypeIndex());
54      }
55  
56      /**
57       * @return signature of referenced method/field.
58       */
59      public String getSignature(final ConstantPoolGen cpg) {
60          final ConstantPool cp = cpg.getConstantPool();
61          final ConstantNameAndType cnat = getNameAndType(cpg);
62          return ((ConstantUtf8) cp.getConstant(cnat.getSignatureIndex())).getBytes();
63      }
64  
65  }