SqlBinOpUnion


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 SqlBinOpUnion extends SqlBinaryOperator implements Executable
27  {
28  
29      private static final String   RCSRevision = "$Revision: 1.4 $";
30      private static final String   RCSName     = "$Name:  $";
31  
32  
33      private int _operator;
34  
35      /**
36      @param operator
37      @param leftOperand
38      @param rightOperand
39      @roseuid 3BD177D8036B
40       */
41      public SqlBinOpUnion(int operator, SqlExpression leftOperand, SqlExpression rightOperand)
42      {
43          super (  leftOperand,  rightOperand );
44          _operator = operator ;
45      }
46  
47      /**
48      @param leftOperator
49      @param rightOperator
50      @roseuid 3BD177D80339
51       */
52      public SqlBinOpUnion()
53      {
54  
55      }
56  
57      /**
58      @return int
59      @roseuid 3BD177D90131
60       */
61      public int getOperator()
62      {
63          return _operator;
64      }
65  
66      /**
67      @param aOperator
68      @roseuid 3BD177D90163
69       */
70      public void setOperator(int aOperator)
71      {
72          _operator = aOperator;
73      }
74  
75      /**
76      @return String
77      @roseuid 3BD177D901F9
78       */
79      public String   toSql(Context context)
80      {
81          //Trace.enter(this,"toSql(Context context)");
82          StringBuffer   retVal = new StringBuffer  ();
83  
84          retVal.append(getLeftOperand().toSql(context)) ;
85          retVal.append(" ");
86          retVal.append(UNION_MODE [_operator]);
87          retVal.append(" ");
88          retVal.append(getRightOperand().toSql(context));
89  
90          //Trace.exit(this,"toSql(Context context)", retVal);
91          return retVal.toString();
92      }
93  }
94
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