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Java > Open Source Codes > org > objectstyle > cayenne > dba > db2 > DB2QualifierTranslator


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
5  *
6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
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13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
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17  * notice, this list of conditions and the following disclaimer in
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21  * 3. The end-user documentation included with the redistribution, if any,
22  * must include the following acknowlegement:
23  * "This product includes software developed by independent contributors
24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
29  * or promote products derived from this software without prior written
30  * permission. For written permission, email
31  * "andrus at objectstyle dot org".
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34  * or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
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37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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48  * SUCH DAMAGE.
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51  * This software consists of voluntary contributions made by many
52  * individuals and hosted on ObjectStyle Group web site. For more
53  * information on the ObjectStyle Group, please see
54  * <http://objectstyle.org/>.
55  */
56
57 package org.objectstyle.cayenne.dba.db2;
58
59 import java.sql.Types JavaDoc;
60
61 import org.objectstyle.cayenne.CayenneRuntimeException;
62 import org.objectstyle.cayenne.access.trans.QueryAssembler;
63 import org.objectstyle.cayenne.access.trans.TrimmingQualifierTranslator;
64 import org.objectstyle.cayenne.dba.TypesMapping;
65 import org.objectstyle.cayenne.exp.Expression;
66 import org.objectstyle.cayenne.map.DbAttribute;
67
68 /**
69  * @author Andrei Adamchik
70  */
71 public class DB2QualifierTranslator extends TrimmingQualifierTranslator {
72
73     public DB2QualifierTranslator() {
74         super();
75     }
76
77     public DB2QualifierTranslator(
78         QueryAssembler queryAssembler,
79         String JavaDoc trimFunction) {
80         super(queryAssembler, trimFunction);
81     }
82
83     protected void appendLiteralDirect(
84         StringBuffer JavaDoc buf,
85         Object JavaDoc val,
86         DbAttribute attr,
87         Expression parentExpression) {
88
89         boolean castNeeded = false;
90
91         if (parentExpression != null) {
92             int type = parentExpression.getType();
93
94             castNeeded =
95                 attr != null
96                     && (type == Expression.LIKE
97                         || type == Expression.LIKE_IGNORE_CASE
98                         || type == Expression.NOT_LIKE
99                         || type == Expression.NOT_LIKE_IGNORE_CASE);
100         }
101
102         if (castNeeded) {
103             buf.append("CAST (");
104         }
105
106         super.appendLiteralDirect(buf, val, attr, parentExpression);
107
108         if (castNeeded) {
109             int jdbcType = attr.getType();
110             int len = attr.getMaxLength();
111
112             // determine CAST type
113
114             // LIKE on CHAR may produce unpredictible results
115 // LIKE on LONVARCHAR doesn't seem to be supported
116 if (jdbcType == Types.CHAR || jdbcType == Types.LONGVARCHAR) {
117                 jdbcType = Types.VARCHAR;
118
119                 // length is required for VARCHAR
120 if (len <= 0) {
121                     len = 254;
122                 }
123             }
124
125             buf.append(" AS ");
126             String JavaDoc[] types =
127                 getQueryAssembler().getAdapter().externalTypesForJdbcType(
128                     jdbcType);
129
130             if (types == null || types.length == 0) {
131                 throw new CayenneRuntimeException(
132                     "Can't find database type for JDBC type '"
133                         + TypesMapping.getSqlNameByType(jdbcType));
134             }
135
136             buf.append(types[0]);
137             if (len > 0 && TypesMapping.supportsLength(jdbcType)) {
138                 buf.append("(").append(len).append(")");
139             }
140
141             buf.append(")");
142         }
143     }
144 }
145
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