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Java > Open Source Codes > org > objectstyle > cayenne > access > trans > DeleteTranslator


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
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6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
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10  * modification, are permitted provided that the following conditions
11  * are met:
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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
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31  * "andrus at objectstyle dot org".
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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 package org.objectstyle.cayenne.access.trans;
57
58 import org.objectstyle.cayenne.map.DbEntity;
59 import org.objectstyle.cayenne.map.DbRelationship;
60
61 /** Class implements default translation mechanism of org.objectstyle.cayenne.query.DeleteQuery
62  * objects to SQL DELETE statements.
63  *
64  * @author Andrei Adamchik
65  */
66 public class DeleteTranslator extends QueryAssembler {
67
68     public String JavaDoc aliasForTable(DbEntity dbEnt) {
69         throw new RuntimeException JavaDoc("aliases not supported");
70     }
71
72     public void dbRelationshipAdded(DbRelationship dbRel) {
73         throw new RuntimeException JavaDoc("db relationships not supported");
74     }
75
76     /** Main method of DeleteTranslator class. Translates DeleteQuery
77      * into a JDBC PreparedStatement
78      */
79     public String JavaDoc createSqlString() throws Exception JavaDoc {
80         StringBuffer JavaDoc queryBuf = new StringBuffer JavaDoc("DELETE FROM ");
81
82         // 1. append table name
83 DbEntity dbEnt = getEntityResolver().lookupDbEntity(query);
84         queryBuf.append(dbEnt.getFullyQualifiedName());
85
86         // 2. build qualifier
87 String JavaDoc qualifierStr =
88             adapter.getQualifierTranslator(this).doTranslation();
89         if (qualifierStr != null)
90             queryBuf.append(" WHERE ").append(qualifierStr);
91
92         return queryBuf.toString();
93     }
94 }
95
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