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Java > Open Source Codes > org > apache > slide > search > basic > expression > CheckResourceTypeExpression


1 /*
2  * $Header: /home/cvs/jakarta-slide/src/share/org/apache/slide/search/basic/expression/CheckResourceTypeExpression.java,v 1.4 2004/07/28 09:34:50 ib Exp $
3  * $Revision: 1.4 $
4  * $Date: 2004/07/28 09:34:50 $
5  *
6  * ====================================================================
7  *
8  * Copyright 1999-2002 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
24 package org.apache.slide.search.basic.expression;
25
26 import org.apache.slide.content.NodeProperty.NamespaceCache;
27 import org.apache.slide.search.InvalidQueryException;
28 import org.apache.slide.search.basic.ComparableResource;
29 import org.apache.slide.search.basic.ComparableResourcesPool;
30 import org.apache.slide.search.basic.Literals;
31 import org.jdom.Element;
32
33 /**
34  * Represents an expression that check for a specific resourcetype.
35  *
36  * @version $Revision: 1.4 $
37  */
38 public abstract class CheckResourceTypeExpression extends ComparePropertyExpression {
39     
40     /**
41      * Creates a resourcetype expression
42      *
43      * @param e jdom element, that describes the expression
44      * @param requestedResourcesPool the pool of resources to apply the expression to.
45      */
46     public CheckResourceTypeExpression (Element e, ComparableResourcesPool requestedResourcesPool) throws InvalidQueryException {
47         super(e, requestedResourcesPool, new ComparedProperty(Literals.RESOURCETYPE, NamespaceCache.DEFAULT_URI));
48     }
49        
50     /**
51      * checks, if the value of resourcetype contains the specified literal
52      *
53      * @param item a BasicDataItem
54      *
55      * @return true, if item is a collection
56      *
57      */
58     protected boolean compare (ComparableResource item) {
59         String JavaDoc resourceTypeValue =
60             (String JavaDoc) item.getThisValue (comparedProperty.getProperty(),
61                                         comparedProperty.getPropNamespace());
62         
63         int index = resourceTypeValue.indexOf (comparedProperty.getLiteral());
64         
65         return index > -1;
66     }
67 }
68
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