01: /*
02: * Copyright 1994-2003 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any 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 class StringExpression extends ConstantExpression {
38: String value;
39:
40: /**
41: * Constructor
42: */
43: public StringExpression(long where, String value) {
44: super (STRINGVAL, where, Type.tString);
45: this .value = value;
46: }
47:
48: public boolean equals(String s) {
49: return value.equals(s);
50: }
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: }
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