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 /**
35 * Constructs a NameSignatureInstruction.
36 */
37 public NameSignatureInstruction() {
38 }
39
40 /**
41 * Constructs a NameSignatureInstruction.
42 *
43 * @param opcode The opcode.
44 * @param index index into constant pool.
45 */
46 public NameSignatureInstruction(final short opcode, final int index) {
47 super(opcode, index);
48 }
49
50 /**
51 * Gets the name of the referenced method or field.
52 *
53 * @param cpg constant pool generator.
54 * @return name of referenced method/field.
55 */
56 public String getName(final ConstantPoolGen cpg) {
57 final ConstantPool cp = cpg.getConstantPool();
58 final ConstantNameAndType cnat = getNameAndType(cpg);
59 return ((ConstantUtf8) cp.getConstant(cnat.getNameIndex())).getBytes();
60 }
61
62 /**
63 * Gets the name and type constant.
64 *
65 * @param cpg constant pool generator.
66 * @return The name and type constant.
67 */
68 public ConstantNameAndType getNameAndType(final ConstantPoolGen cpg) {
69 final ConstantPool cp = cpg.getConstantPool();
70 final ConstantCP cmr = (ConstantCP) cp.getConstant(super.getIndex());
71 return (ConstantNameAndType) cp.getConstant(cmr.getNameAndTypeIndex());
72 }
73
74 /**
75 * Gets the signature of the referenced method or field.
76 *
77 * @param cpg constant pool generator.
78 * @return signature of referenced method/field.
79 */
80 public String getSignature(final ConstantPoolGen cpg) {
81 final ConstantPool cp = cpg.getConstantPool();
82 final ConstantNameAndType cnat = getNameAndType(cpg);
83 return ((ConstantUtf8) cp.getConstant(cnat.getSignatureIndex())).getBytes();
84 }
85
86 }