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.expr;
31:
32: import com.caucho.quercus.Location;
33: import com.caucho.quercus.env.Env;
34: import com.caucho.quercus.env.Value;
35: import com.caucho.quercus.env.BooleanValue;
36:
37: /**
38: * Represents a PHP isset call
39: */
40: public class IssetExpr extends UnaryExpr {
41: public IssetExpr(Location location, Expr expr) {
42: super (location, expr);
43: }
44:
45: public IssetExpr(Expr expr) {
46: super (expr);
47: }
48:
49: /**
50: * Return true as a boolean.
51: */
52: public boolean isBoolean() {
53: return true;
54: }
55:
56: /**
57: * Evaluates the expression.
58: *
59: * @param env the calling environment.
60: *
61: * @return the expression value.
62: */
63: public Value eval(Env env) {
64: return _expr.eval(env).isset() ? BooleanValue.TRUE
65: : BooleanValue.FALSE;
66: }
67:
68: public String toString() {
69: return "isset(" + _expr + ")";
70: }
71: }
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