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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  package org.apache.commons.compress.harmony.unpack200.bytecode;
18  
19  import java.io.DataOutputStream;
20  import java.io.IOException;
21  
22  /**
23   * String constant pool entry.
24   */
25  public class CPString extends CPConstant {
26  
27      private transient int nameIndex;
28      private final CPUTF8 name;
29  
30      private boolean hashCodeComputed;
31  
32      private int cachedHashCode;
33  
34      public CPString(final CPUTF8 value, final int globalIndex) {
35          super(CP_String, value, globalIndex);
36          this.name = value;
37      }
38  
39      private void generateHashCode() {
40          hashCodeComputed = true;
41          final int PRIME = 31;
42          int result = 1;
43          result = PRIME * result + name.hashCode();
44          cachedHashCode = result;
45      }
46  
47      @Override
48      protected ClassFileEntry[] getNestedClassFileEntries() {
49          return new ClassFileEntry[] { name };
50      }
51  
52      @Override
53      public int hashCode() {
54          if (!hashCodeComputed) {
55              generateHashCode();
56          }
57          return cachedHashCode;
58      }
59  
60      /**
61       * Allows the constant pool entries to resolve their nested entries
62       *
63       * @param pool TODO
64       */
65      @Override
66      protected void resolve(final ClassConstantPool pool) {
67          super.resolve(pool);
68          nameIndex = pool.indexOf(name);
69      }
70  
71      @Override
72      public String toString() {
73          return "String: " + getValue();
74      }
75  
76      @Override
77      protected void writeBody(final DataOutputStream dos) throws IOException {
78          dos.writeShort(nameIndex);
79      }
80  }