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Java > Open Source Codes > com > genimen > djeneric > tools > scriptengine > core > nodes > IfNode


1 /*
2  * Copyright (c) 2001-2005 by Genimen BV (www.genimen.com) All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, is permitted provided that the following conditions are met: -
6  * Redistributions of source code must retain the above copyright notice, this
7  * list of conditions and the following disclaimer. - Redistributions in binary
8  * form must reproduce the above copyright notice, this list of conditions and
9  * the following disclaimer in the documentation and/or other materials
10  * provided with the distribution. - All advertising materials mentioning
11  * features or use of this software must display the following acknowledgment:
12  * "This product includes Djeneric." - Products derived from this software may
13  * not be called "Djeneric" nor may "Djeneric" appear in their names without
14  * prior written permission of Genimen BV. - Redistributions of any form
15  * whatsoever must retain the following acknowledgment: "This product includes
16  * Djeneric."
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL GENIMEN BV, DJENERIC.ORG, OR CONTRIBUTORS
22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28  * POSSIBILITY OF SUCH DAMAGE.
29  */
30 package com.genimen.djeneric.tools.scriptengine.core.nodes;
31
32 import com.genimen.djeneric.language.Messages;
33 import com.genimen.djeneric.tools.scriptengine.core.DjScriptParserEngine;
34 import com.genimen.djeneric.tools.scriptengine.core.SimpleNode;
35 import com.genimen.djeneric.tools.scriptengine.core.util.DjScriptExecutionException;
36 import com.genimen.djeneric.tools.scriptengine.core.util.DjScriptExecutionTimeScope;
37
38 public class IfNode extends SimpleNode
39 {
40
41   public IfNode(int i)
42   {
43     super(i);
44   }
45
46   public IfNode(DjScriptParserEngine p, int i)
47   {
48     super(p, i);
49   }
50
51   public String JavaDoc getName()
52   {
53     return "if";
54   }
55
56   public String JavaDoc toString()
57   {
58     return "ifNode";
59   }
60
61   public void execute(DjScriptExecutionTimeScope context) throws DjScriptExecutionException
62   {
63     if (!(getChild(0) instanceof BooleanExpression))
64     {
65       if (getChild(0) instanceof ValueExpression)
66       {
67         ValueExpression ve = (ValueExpression) getChild(0);
68         Object JavaDoc o = ve.getValue(context);
69         if (o instanceof Boolean JavaDoc)
70         {
71           Boolean JavaDoc b = (Boolean JavaDoc) o;
72           if (b.booleanValue()) handleTrue(context);
73           else handleFalse(context);
74           return;
75         }
76       }
77       throw new DjScriptExecutionException(Messages.getString("IfNode.NotBoolean"), this);
78     }
79
80     BooleanExpression expr = (BooleanExpression) getChild(0);
81     if (expr.isTrue(context)) handleTrue(context);
82     else handleFalse(context);
83   }
84
85   void handleTrue(DjScriptExecutionTimeScope context) throws DjScriptExecutionException
86   {
87     getChild(1).execute(context);
88   }
89
90   void handleFalse(DjScriptExecutionTimeScope context) throws DjScriptExecutionException
91   {
92     // Does the if have an else?
93 if (getChildCount() == 3)
94     {
95       getChild(2).execute(context);
96     }
97   }
98
99 }
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