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 package org.apache.commons.compress.harmony.unpack200.bytecode;
20
21 import java.io.DataOutputStream;
22 import java.io.IOException;
23
24 /**
25 * String constant pool entry.
26 */
27 public class CPString extends CPConstant {
28
29 private transient int nameIndex;
30 private final CPUTF8 name;
31
32 private boolean hashCodeComputed;
33
34 private int cachedHashCode;
35
36 /**
37 * Constructs a new instance.
38 *
39 * @param value The value.
40 * @param globalIndex Global index.
41 */
42 public CPString(final CPUTF8 value, final int globalIndex) {
43 super(CP_String, value, globalIndex);
44 this.name = value;
45 }
46
47 private void generateHashCode() {
48 hashCodeComputed = true;
49 final int PRIME = 31;
50 int result = 1;
51 result = PRIME * result + name.hashCode();
52 cachedHashCode = result;
53 }
54
55 @Override
56 protected ClassFileEntry[] getNestedClassFileEntries() {
57 return new ClassFileEntry[] { name };
58 }
59
60 @Override
61 public int hashCode() {
62 if (!hashCodeComputed) {
63 generateHashCode();
64 }
65 return cachedHashCode;
66 }
67
68 /**
69 * Allows the constant pool entries to resolve their nested entries
70 *
71 * @param pool TODO
72 */
73 @Override
74 protected void resolve(final ClassConstantPool pool) {
75 super.resolve(pool);
76 nameIndex = pool.indexOf(name);
77 }
78
79 @Override
80 public String toString() {
81 return "String: " + getValue();
82 }
83
84 @Override
85 protected void writeBody(final DataOutputStream dos) throws IOException {
86 dos.writeShort(nameIndex);
87 }
88 }