01: /*
02: * JBoss, Home of Professional Open Source.
03: * Copyright 2006, Red Hat Middleware LLC, and individual contributors
04: * as indicated by the @author tags. See the copyright.txt file in the
05: * distribution for a full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * 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;
29: import java.sql.ResultSet;
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: 57209 $
37: */
38: public final class ASTConcat extends SimpleNode implements
39: SelectFunction {
40: private final Logger log;
41:
42: public ASTConcat(int id) {
43: super (id);
44: log = Logger.getLogger(getClass());
45: }
46:
47: /** Accept the visitor. **/
48: public Object jjtAccept(JBossQLParserVisitor visitor, Object data) {
49: return visitor.visit(this , data);
50: }
51:
52: /**
53: * Reads results.
54: * @param rs the result set to read from.
55: * @return the result of the function
56: * @throws SQLException
57: */
58: public Object readResult(ResultSet rs) throws SQLException {
59: return JDBCResultSetReader.STRING_READER.get(rs, 1,
60: String.class, log);
61: }
62: }
|