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.JDBCResultSetReader;
25: import org.jboss.logging.Logger;
26:
27: import java.sql.SQLException;
28: import java.sql.ResultSet;
29:
30: /**
31: * This abstract syntax node represents a substring function.
32: *
33: * @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
34: * @author <a href="mailto:alex@jboss.org">Alex Loubyansky</a>
35: * @version $Revision: 57209 $
36: */
37: public final class ASTSubstring extends SimpleNode implements
38: SelectFunction {
39: private final Logger log;
40:
41: public ASTSubstring(int id) {
42: super (id);
43: log = Logger.getLogger(getClass());
44: }
45:
46: /** Accept the visitor. **/
47: public Object jjtAccept(JBossQLParserVisitor visitor, Object data) {
48: return visitor.visit(this , data);
49: }
50:
51: /**
52: * Reads results.
53: * @param rs the result set to read from.
54: * @return the result of the function
55: * @throws SQLException
56: */
57: public Object readResult(ResultSet rs) throws SQLException {
58: return JDBCResultSetReader.STRING_READER.get(rs, 1,
59: String.class, log);
60: }
61: }
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