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Java > Open Source Codes > org > apache > slide > store > impl > rdbms > expression > RDBMSExpression


1 /*
2  * $Header: /home/cvs/jakarta-slide/src/stores/org/apache/slide/store/impl/rdbms/expression/RDBMSExpression.java,v 1.2.2.1 2004/09/13 16:42:57 unico Exp $
3  * $Revision: 1.2.2.1 $
4  * $Date: 2004/09/13 16:42:57 $
5  *
6  * ====================================================================
7  *
8  * Copyright 1999-2004 The Apache Software Foundation
9  *
10  * Licensed under the Apache License, Version 2.0 (the "License");
11  * you may not use this file except in compliance with the License.
12  * You may obtain a copy of the License at
13  *
14  * http://www.apache.org/licenses/LICENSE-2.0
15  *
16  * Unless required by applicable law or agreed to in writing, software
17  * distributed under the License is distributed on an "AS IS" BASIS,
18  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19  * See the License for the specific language governing permissions and
20  * limitations under the License.
21  *
22  */
23 package org.apache.slide.store.impl.rdbms.expression;
24
25 import org.apache.slide.search.SearchException;
26 import org.apache.slide.search.basic.IBasicExpression;
27 import org.apache.slide.search.basic.IBasicExpressionFactory;
28 import org.apache.slide.search.basic.IBasicResultSet;
29
30 /**
31  * Base class for RDBMS expressions.
32  */
33 public abstract class RDBMSExpression implements IBasicExpression {
34
35     protected RDBMSExpressionFactory _factory;
36     protected RDBMSQueryContext _context;
37
38     public RDBMSExpression(RDBMSQueryContext context) {
39         _context = context;
40     }
41     
42     public IBasicExpressionFactory getFactory() {
43         return _factory;
44     }
45
46     public void setFactory(IBasicExpressionFactory factory) {
47         _factory = (RDBMSExpressionFactory) factory;
48     }
49
50     protected abstract IBasicResultSet compile(RDBMSMergeExpression expression)
51     throws SearchException;
52
53 }
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