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


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 java.util.HashMap JavaDoc;
33
34 import com.genimen.djeneric.tools.scriptengine.core.DjScriptParserEngine;
35 import com.genimen.djeneric.tools.scriptengine.core.SimpleNode;
36 import com.genimen.djeneric.tools.scriptengine.core.util.DjScriptCompileTimeScope;
37 import com.genimen.djeneric.tools.scriptengine.core.util.DjScriptExecutionTimeScope;
38
39 public class NullNode extends SimpleNode implements ValueExpression
40 {
41
42   public static final String JavaDoc NULL_TYPE = "null";
43
44   public NullNode(int i)
45   {
46     super(i);
47   }
48
49   public NullNode(DjScriptParserEngine p, int i)
50   {
51     super(p, i);
52   }
53
54   public String JavaDoc getName()
55   {
56     return "null";
57   }
58
59   public String JavaDoc toString()
60   {
61     return "null";
62   }
63
64   public Object JavaDoc getValue(DjScriptExecutionTimeScope context)
65   {
66     return null;
67   }
68
69   public void translateOql(DjScriptExecutionTimeScope ctxt, StringBuffer JavaDoc result, HashMap JavaDoc parameters)
70   {
71     result.append(" null ");
72   }
73
74   public String JavaDoc getValidatedTypeName(DjScriptCompileTimeScope context)
75   {
76     return NULL_TYPE;
77   }
78
79 }
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