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


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 import java.sql.ResultSet JavaDoc;
47 import java.sql.SQLException JavaDoc;
48 import java.sql.Types JavaDoc;
49
50 import com.quadcap.util.Debug;
51
52 /**
53  * The SQL types <b>DOUBLE</b>, <b>FLOAT</b>, <b>REAL</b>.
54  *
55  * @author Stan Bailes
56  */

57 public class TypeReal implements Type, Externalizable JavaDoc {
58     public static final TypeReal typeFloat = new TypeReal(Types.FLOAT,23);
59     public static final TypeReal typeReal = new TypeReal(Types.REAL,23);
60     public static final TypeReal typeDouble = new TypeReal(Types.DOUBLE,53);
61
62     int type;
63     int precision;
64
65     public TypeReal() {}
66
67     public TypeReal(int type, int precision) {
68     this.type = type;
69     this.precision = precision;
70     }
71     
72     public String JavaDoc getTypeName() {
73     switch (type) {
74     case Types.DOUBLE:
75         return "DOUBLE PRECISION";
76     case Types.FLOAT:
77         return "FLOAT";
78     case Types.REAL:
79         return "REAL";
80     default:
81         throw new RuntimeException JavaDoc("Bad type: " + type);
82     }
83     }
84
85     public int getJDBCType() { return type; }
86
87     public String JavaDoc getJDBCClassName() {
88     switch (type) {
89     case Types.DOUBLE:
90         return "java.lang.Double";
91     case Types.FLOAT:
92         if (precision > 23) {
93         return "java.lang.Double";
94         } else {
95         return "java.lang.Float";
96         }
97     case Types.REAL:
98         return "java.lang.Float";
99     default:
100         throw new RuntimeException JavaDoc("Bad type: " + type);
101     }
102     }
103
104     public int getPrecision() { return precision; }
105
106     public int getScale() { return 0; }
107
108     public int getMaxPrecision() {
109     switch (type) {
110     case Types.DOUBLE:
111         return 53;
112     case Types.FLOAT:
113         return 23;
114     case Types.REAL:
115         return 23;
116     }
117     return 53;
118     }
119
120     public int getMinScale() { return -1; }
121
122     public int getMaxScale() { return -1; }
123
124     public boolean isCharType() { return false; }
125
126     public boolean isCaseSensitive() { return false; }
127
128     public boolean isCurrency() { return false; }
129
130     public boolean isSigned() { return true; }
131
132     public int getDisplayWidth() { return 12; }
133     
134     public String JavaDoc toString() {
135     StringBuffer JavaDoc sb = new StringBuffer JavaDoc(getTypeName());
136     if (type == Types.FLOAT) {
137         sb.append('(');
138         sb.append(Integer.toString(precision));
139         sb.append(')');
140     }
141     return sb.toString();
142     }
143     
144     /**
145      * We don't bother serializing the data, since Java serialization is
146      * only used for the type portion of a table column.
147      */

148     public void readExternal(ObjectInput JavaDoc in) throws IOException JavaDoc {
149     type = in.read();
150     precision = in.read();
151     }
152     
153     public void writeExternal(ObjectOutput JavaDoc out) throws IOException JavaDoc {
154     out.write(type);
155     out.write(precision);
156     }
157
158     public Value convert(Value v) throws ValueException {
159     return v.convert(this);
160     }
161
162     public String JavaDoc getCreateParams() {
163     if (type == Types.FLOAT) {
164         return "precision";
165     }
166         return null;
167     }
168 }
169
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