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Java > Open Source Codes > com > caucho > db > sql > BinaryEqExpr


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */

28
29 package com.caucho.db.sql;
30
31 import com.caucho.log.Log;
32
33 import java.sql.SQLException JavaDoc;
34 import java.util.ArrayList JavaDoc;
35 import java.util.logging.Logger JavaDoc;
36
37 class BinaryEqExpr extends Expr {
38   private static final Logger JavaDoc log = Log.open(BinaryEqExpr.class);
39
40   private ColumnExpr _column;
41   private byte []_matchBuffer;
42
43   BinaryEqExpr(ColumnExpr left, StringExpr right)
44   {
45     _column = left;
46
47     try {
48       _matchBuffer = right.getValue().getBytes("UTF8");
49     } catch (Exception JavaDoc e) {
50       throw new RuntimeException JavaDoc(e);
51     }
52   }
53
54   protected Expr bind(Query query)
55     throws SQLException JavaDoc
56   {
57     throw new UnsupportedOperationException JavaDoc();
58   }
59
60   /**
61    * Returns the type of the expression.
62    */

63   public Class JavaDoc getType()
64   {
65     return boolean.class;
66   }
67
68   /**
69    * Returns the cost based on the given FromList.
70    */

71   public long subCost(ArrayList JavaDoc<FromItem> fromList)
72   {
73     return _column.subCost(fromList);
74   }
75
76   /**
77    * Evaluates the expression as a boolean.
78    */

79   public int evalBoolean(QueryContext context)
80     throws SQLException JavaDoc
81   {
82     if (_column.isNull(context))
83       return UNKNOWN;
84     else
85       return _column.evalEqual(context, _matchBuffer) ? TRUE : FALSE;
86   }
87
88   public String JavaDoc evalString(QueryContext context)
89     throws SQLException JavaDoc
90   {
91     throw new SQLException JavaDoc("can't convert string to boolean");
92   }
93
94   public String JavaDoc toString()
95   {
96     return "(" + _column + " = byte[])";
97   }
98 }
99
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