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Java > Open Source Codes > org > jboss > ejb > plugins > cmp > ejbql > AggregateFunction


1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2005, JBoss Inc., and individual contributors as indicated
4 * by the @authors tag. See the copyright.txt in the distribution for a
5 * full listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This software is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this software; if not, write to the Free
19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21 */
22 package org.jboss.ejb.plugins.cmp.ejbql;
23
24 import org.jboss.ejb.plugins.cmp.jdbc.JDBCUtil;
25 import org.jboss.ejb.plugins.cmp.jdbc.JDBCResultSetReader;
26 import org.jboss.logging.Logger;
27
28 import java.sql.ResultSet JavaDoc;
29 import java.sql.SQLException JavaDoc;
30 import java.util.Collection JavaDoc;
31
32 /**
33  * @author <a HREF="mailto:alex@jboss.org">Alexey Loubyansky</a>
34  * @version <tt>$Revision: 37459 $</tt>
35  */
36 public abstract class AggregateFunction
37    extends SimpleNode
38    implements SelectFunction
39 {
40    private final Logger log;
41    private JDBCResultSetReader resultReader;
42    private Class JavaDoc resultType;
43
44    public String JavaDoc distinct = "";
45
46    public AggregateFunction(int i)
47    {
48       super(i);
49       log = Logger.getLogger(getClass());
50    }
51
52    public void setResultType(Class JavaDoc type)
53    {
54       if(Collection JavaDoc.class.isAssignableFrom(type))
55       {
56          resultType = getDefaultResultType();
57       }
58       else
59       {
60          this.resultType = type;
61       }
62       this.resultReader = JDBCUtil.getResultReaderByType(resultType);
63    }
64
65    protected Class JavaDoc getDefaultResultType()
66    {
67       return Double JavaDoc.class;
68    }
69
70    // SelectFunction implementation
71
72    public Object JavaDoc readResult(ResultSet JavaDoc rs) throws SQLException JavaDoc
73    {
74       return resultReader.get(rs, 1, resultType, log);
75    }
76 }
77
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