StringConstant


1   /*
2    * Copyright (c) 2003-2006, Franz-Josef Elmer, All rights reserved.
3    *
4    * Redistribution and use in source and binary forms, with or without 
5    * modification, are permitted provided that the following conditions are met:
6    * 
7    * - Redistributions of source code must retain the above copyright notice, 
8    *   this list of conditions and the following disclaimer.
9    * - Redistributions in binary form must reproduce the above copyright notice, 
10   *   this list of conditions and the following disclaimer in the documentation 
11   *   and/or other materials provided with the distribution.
12   *
13   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
14   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 
15   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
16   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
17   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
18   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
19   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20   * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
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22   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
23   * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
24   */
25  package classycle.classfile;
26  
27  /**
28   * Constant of a <tt>String</tt> value.
29   * 
30   * @author Franz-Josef Elmer
31   */
32  public class StringConstant extends Constant {
33    private final int _stringIndex;
34  
35    /**
36     * Creates an instance for the specfied index.
37     * @param pool Constant pool. Needed for resolving the reference.
38     * @param stringIndex Index of an {@link UTF8Constant}.
39     */
40    public StringConstant(Constant[] pool, int stringIndex) {
41      super(pool);
42      _stringIndex = stringIndex;
43    }
44  
45    /** Returns the string value. */
46    public String   getString() {
47      String   result = null;
48      Constant c = getConstant(_stringIndex);
49      if (c instanceof UTF8Constant) {
50        result = ((UTF8Constant) c).getString();
51      }
52      return result;
53    }
54  
55    /** Returns the constant type and the string value. */
56    public String   toString() {
57      return "CONSTANT_String: " + getString();
58    }
59  } //class
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