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Java > Open Source Codes > org > xquark > extractor > sql > SfSubString


1 /*
2  * This file belongs to the XQuark distribution.
3  * Copyright (C) 2003 Universite de Versailles Saint-Quentin.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307.
18  * You can also get it at http://www.gnu.org/licenses/lgpl.html
19  *
20  * For more information on this software, see http://www.xquark.org.
21  */
22
23 package org.xquark.extractor.sql;
24
25
26 public class SfSubString extends SqlFunction {
27
28     private static final String JavaDoc RCSRevision = "$Revision: 1.4 $";
29     private static final String JavaDoc RCSName = "$Name: $";
30
31     private static final String JavaDoc OPERATOR_ID = "SUBSTR";
32
33     public SfSubString()
34     {
35         super("SfSubString");
36     }
37
38     public SfSubString(SqlExpression arg0, SqlExpression arg1)
39     {
40         super("SfSubString");
41         setArgument(0,arg0);
42         setArgument(1,arg1);
43     }
44
45     public SfSubString(SqlExpression arg0, SqlExpression arg1, SqlExpression arg2)
46     {
47         super("SfSubString");
48         setArgument(0,arg0);
49         setArgument(1,arg1);
50         setArgument(2,arg2);
51     }
52
53     public String JavaDoc toSql (Context context)
54     {
55         //Trace.enter(this,"toSql(Context context)");
56
57         StringBuffer JavaDoc retVal = new StringBuffer JavaDoc();
58         retVal.append(getOperatorId());
59         retVal.append('(');
60         retVal.append(getArgument(0).toSql(context));
61         int num = getArgumentNumber();
62         if (1 < num){
63             retVal.append(",");
64             retVal.append(getArgument(1).toSql(context));
65         }
66         if ( 2 < num){
67             retVal.append(",");
68             retVal.append(getArgument(2).toSql(context));
69         }
70         retVal.append(")");
71
72         //Trace.exit(this,"toSql(Context context)");
73 return retVal.toString();
74     }
75     
76     protected String JavaDoc getOperatorId() { return OPERATOR_ID;}
77 }
78
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