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


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.SQLException JavaDoc;
29 import java.sql.ResultSet JavaDoc;
30
31 /**
32  * This abstract syntax node represents a concat function.
33  *
34  * @author <a HREF="mailto:dain@daingroup.com">Dain Sundstrom</a>
35  * @author <a HREF="mailto:alex@jboss.org">Alex Loubyansky</a>
36  * @version $Revision: 37459 $
37  */
38 public final class ASTConcat
39    extends SimpleNode
40    implements SelectFunction
41 {
42    private final Logger log;
43
44    public ASTConcat(int id)
45    {
46       super(id);
47       log = Logger.getLogger(getClass());
48    }
49
50    /** Accept the visitor. **/
51    public Object JavaDoc jjtAccept(JBossQLParserVisitor visitor, Object JavaDoc data)
52    {
53       return visitor.visit(this, data);
54    }
55
56    /**
57     * Reads results.
58     * @param rs the result set to read from.
59     * @return the result of the function
60     * @throws SQLException
61     */
62    public Object JavaDoc readResult(ResultSet JavaDoc rs) throws SQLException JavaDoc
63    {
64       return JDBCResultSetReader.STRING_READER.get(rs, 1, String JavaDoc.class, log);
65    }
66 }
67
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