01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * Resin Open Source is free software; you can redistribute it and/or modify
10: * it under the terms of the GNU General Public License as published by
11: * the Free Software Foundation; either version 2 of the License, or
12: * (at your option) any later version.
13: *
14: * Resin Open Source is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17: * of NON-INFRINGEMENT. See the GNU General Public License for more
18: * details.
19: *
20: * You should have received a copy of the GNU General Public License
21: * along with Resin Open Source; if not, write to the
22: *
23: * Free Software Foundation, Inc.
24: * 59 Temple Place, Suite 330
25: * Boston, MA 02111-1307 USA
26: *
27: * @author Scott Ferguson
28: */
29:
30: package com.caucho.quercus.program;
31:
32: import com.caucho.quercus.expr.Expr;
33:
34: /**
35: * Represents a formal argument.
36: */
37: public class Arg {
38: private final String _name;
39: private final Expr _default;
40:
41: private final boolean _isReference;
42:
43: public Arg(String name, Expr defaultExpr, boolean isReference) {
44: _name = name.intern();
45: _default = defaultExpr;
46: _isReference = isReference;
47:
48: if (_default == null)
49: throw new IllegalStateException();
50: }
51:
52: /**
53: * Returns the argument name.
54: */
55: public String getName() {
56: return _name;
57: }
58:
59: /**
60: * Returns the default expression
61: */
62: public Expr getDefault() {
63: return _default;
64: }
65:
66: /**
67: * Returns true for a reference argument.
68: */
69: public boolean isReference() {
70: return _isReference;
71: }
72:
73: public String toString() {
74: return "Arg[" + _name + "]";
75: }
76: }
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