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1   /*
2    * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
6    * under the terms of the GNU General Public License version 2 only, as
7    * published by the Free Software Foundation.  Oracle designates this
8    * particular file as subject to the "Classpath" exception as provided
9    * by Oracle in the LICENSE file that accompanied this code.
10   *
11   * This code is distributed in the hope that it will be useful, but WITHOUT
12   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14   * version 2 for more details (a copy is included in the LICENSE file that
15   * accompanied this code).
16   *
17   * You should have received a copy of the GNU General Public License version
18   * 2 along with this work; if not, write to the Free Software Foundation,
19   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20   *
21   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22   * or visit www.oracle.com if you need additional information or have any
23   * questions.
24   */
25  
26  package sun.tools.tree;
27  
28  import sun.tools.java.*;
29  import sun.tools.asm.Assembler;
30  import java.io.PrintStream;
31  
32  /**
33   * WARNING: The contents of this source file are not part of any
34   * supported API.  Code that depends on them does so at its own risk:
35   * they are subject to change or removal without notice.
36   */
37  public
38  class StringExpression extends ConstantExpression {
39      String value;
40  
41      /**
42       * Constructor
43       */
44      public StringExpression(long where, String value) {
45          super(STRINGVAL, where, Type.tString);
46          this.value = value;
47      }
48  
49      public boolean equals(String s) {
50          return value.equals(s);
51      }
52      public boolean isNonNull() {
53          return true;            // string literal is never null
54      }
55  
56      /**
57       * Code
58       */
59      public void codeValue(Environment env, Context ctx, Assembler asm) {
60          asm.add(where, opc_ldc, this);
61      }
62  
63      /**
64       * Get the value
65       */
66      public Object getValue() {
67          return value;
68      }
69  
70      /**
71       * Hashcode
72       */
73      public int hashCode() {
74          return value.hashCode() ^ 3213;
75      }
76  
77      /**
78       * Equality
79       */
80      public boolean equals(Object obj) {
81          if ((obj != null) && (obj instanceof StringExpression)) {
82              return value.equals(((StringExpression)obj).value);
83          }
84          return false;
85      }
86  
87      /**
88       * Print
89       */
90      public void print(PrintStream out) {
91          out.print("\"" + value + "\"");
92      }
93  }