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


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.JDBCResultSetReader;
25 import org.jboss.logging.Logger;
26
27 import java.sql.SQLException JavaDoc;
28 import java.sql.ResultSet JavaDoc;
29
30 /**
31  * This abstract syntax node represents a square root 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: 37459 $
36  */
37 public final class ASTSqrt
38    extends SimpleNode
39    implements SelectFunction
40 {
41    private final Logger log;
42
43    public ASTSqrt(int id)
44    {
45       super(id);
46       log = Logger.getLogger(getClass());
47    }
48
49    /** Accept the visitor. **/
50    public Object JavaDoc jjtAccept(JBossQLParserVisitor visitor, Object JavaDoc data)
51    {
52       return visitor.visit(this, data);
53    }
54
55    // SelectFunction implementation
56
57    /**
58     * Reads results.
59     * @param rs the result set to read from.
60     * @return the result of the function
61     * @throws SQLException
62     */
63    public Object JavaDoc readResult(ResultSet JavaDoc rs) throws SQLException JavaDoc
64    {
65       return JDBCResultSetReader.DOUBLE_READER.get(rs, 1, Double JavaDoc.class, log);
66    }
67 }
68
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