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Java > Open Source Codes > org > alfresco > jcr > item > JCRPatternMatch


1 /*
2  * Copyright (C) 2005 Alfresco, Inc.
3  *
4  * Licensed under the Mozilla Public License version 1.1
5  * with a permitted attribution clause. You may obtain a
6  * copy of the License at
7  *
8  * http://www.alfresco.org/legal/license.txt
9  *
10  * Unless required by applicable law or agreed to in writing,
11  * software distributed under the License is distributed on an
12  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
13  * either express or implied. See the License for the specific
14  * language governing permissions and limitations under the
15  * License.
16  */
17 package org.alfresco.jcr.item;
18
19 import java.util.ArrayList JavaDoc;
20 import java.util.List JavaDoc;
21 import java.util.StringTokenizer JavaDoc;
22
23 import org.alfresco.service.namespace.NamespacePrefixResolver;
24 import org.alfresco.service.namespace.QName;
25 import org.alfresco.service.namespace.QNamePattern;
26
27 /**
28  * Checks if the QName matches the passed JCR pattern.
29  *
30  * The pattern may be a full name or a partial name with one or more wildcard
31  * characters ("*"), or a disjunction (using the "|" character to represent
32  * logical OR) of these. For example,
33  *
34  * isMatch("jcr:* | myapp:report | my doc")
35  *
36  * Note that leading and trailing whitespace around a disjunct is ignored,
37  * but whitespace within a disjunct forms part of the pattern to be matched.
38  *
39  * The EBNF for namePattern is:
40  *
41  * namePattern ::= disjunct {'|' disjunct}
42  * disjunct ::= name [':' name]
43  * name ::= '*' | ['*'] fragment {'*' fragment} ['*']
44  * fragment ::= char {char}
45  * char ::= nonspace | ' '
46  * nonspace ::= (* Any Unicode character except: '/', ':', '[', ']', '*', ''', '"', '|' or any whitespace character *)
47  */
48 public class JCRPatternMatch implements QNamePattern
49 {
50     private List JavaDoc<String JavaDoc> searches = new ArrayList JavaDoc<String JavaDoc>();
51     private NamespacePrefixResolver resolver;
52     
53     
54     /**
55      * Construct
56      * @param pattern JCR Pattern
57      * @param resolver Namespace Prefix Resolver
58      */
59     public JCRPatternMatch(String JavaDoc pattern, NamespacePrefixResolver resolver)
60     {
61         // TODO: Check for valid pattern
62
63         // Convert to regular expression
64 String JavaDoc regexPattern = pattern.replaceAll("\\*", ".*");
65
66         // Split into independent search strings
67 StringTokenizer JavaDoc tokenizer = new StringTokenizer JavaDoc(regexPattern, "|", false);
68         while (tokenizer.hasMoreTokens())
69         {
70             String JavaDoc disjunct = tokenizer.nextToken().trim();
71             this.searches.add(disjunct);
72         }
73         
74         this.resolver = resolver;
75     }
76     
77     /* (non-Javadoc)
78      * @see org.alfresco.service.namespace.QNamePattern#isMatch(org.alfresco.service.namespace.QName)
79      */
80     public boolean isMatch(QName qname)
81     {
82         String JavaDoc prefixedName = qname.toPrefixString(resolver);
83         for (String JavaDoc search : searches)
84         {
85             if (prefixedName.matches(search))
86             {
87                 return true;
88             }
89         }
90         return false;
91     }
92
93 }
94
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