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Java > Open Source Codes > com > quadcap > sql > types > ValueType


1 package com.quadcap.sql.types;
2
3 /* Copyright 1999 - 2003 Quadcap Software. All rights reserved.
4  *
5  * This software is distributed under the Quadcap Free Software License.
6  * This software may be used or modified for any purpose, personal or
7  * commercial. Open Source redistributions are permitted. Commercial
8  * redistribution of larger works derived from, or works which bundle
9  * this software requires a "Commercial Redistribution License"; see
10  * http://www.quadcap.com/purchase.
11  *
12  * Redistributions qualify as "Open Source" under one of the following terms:
13  *
14  * Redistributions are made at no charge beyond the reasonable cost of
15  * materials and delivery.
16  *
17  * Redistributions are accompanied by a copy of the Source Code or by an
18  * irrevocable offer to provide a copy of the Source Code for up to three
19  * years at the cost of materials and delivery. Such redistributions
20  * must allow further use, modification, and redistribution of the Source
21  * Code under substantially the same terms as this license.
22  *
23  * Redistributions of source code must retain the copyright notices as they
24  * appear in each source code file, these license terms, and the
25  * disclaimer/limitation of liability set forth as paragraph 6 below.
26  *
27  * Redistributions in binary form must reproduce this Copyright Notice,
28  * these license terms, and the disclaimer/limitation of liability set
29  * forth as paragraph 6 below, in the documentation and/or other materials
30  * provided with the distribution.
31  *
32  * The Software is provided on an "AS IS" basis. No warranty is
33  * provided that the Software is free of defects, or fit for a
34  * particular purpose.
35  *
36  * Limitation of Liability. Quadcap Software shall not be liable
37  * for any damages suffered by the Licensee or any third party resulting
38  * from use of the Software.
39  */
40
41 import java.io.Externalizable JavaDoc;
42 import java.io.IOException JavaDoc;
43 import java.io.ObjectInput JavaDoc;
44 import java.io.ObjectOutput JavaDoc;
45
46 /**
47  * A value which conatains a type.
48  *
49  * @author Stan Bailes
50  */
51 public class ValueType extends Value implements Externalizable JavaDoc {
52     Type type;
53
54     public ValueType() {}
55
56     public ValueType(Type type) { this.type = type; }
57
58     public Value binop(int op, Value l) throws ValueException {
59     return l.binop(op, this);
60     }
61
62     public boolean isTrue() { return false; }
63
64     public Object JavaDoc asJavaObject() {
65     return null;
66     }
67
68     public void fromJavaObject(Object JavaDoc obj) throws ValueException {
69     throw new ValueException("bad type: " + obj);
70     }
71
72     public Type getType() {
73     return type;
74     }
75
76     public void readExternal(ObjectInput JavaDoc in)
77         throws IOException JavaDoc, ClassNotFoundException JavaDoc
78     {
79     type = (Type)in.readObject();
80     }
81     
82     public void writeExternal(ObjectOutput JavaDoc out)
83     throws IOException JavaDoc
84     {
85     out.writeObject(type);
86     }
87
88     public void serializeKey(KeyStream out) throws IOException JavaDoc {
89     throw new IOException JavaDoc("Can't use type as key");
90     }
91 }
92
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