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Java > Open Source Codes > org > mdarad > framework > index > AbstractIndexDelegate


1 package org.mdarad.framework.index;
2
3 import java.io.IOException JavaDoc;
4 import java.util.Collection JavaDoc;
5 import java.util.HashMap JavaDoc;
6 import java.util.Iterator JavaDoc;
7 import java.util.Locale JavaDoc;
8 import java.util.Map JavaDoc;
9
10 import org.apache.lucene.analysis.Analyzer;
11 import org.apache.lucene.analysis.standard.StandardAnalyzer;
12 import org.apache.lucene.document.Document;
13 import org.apache.lucene.index.IndexWriter;
14 import org.apache.lucene.queryParser.ParseException;
15 import org.apache.lucene.queryParser.QueryParser;
16 import org.apache.lucene.search.Hits;
17 import org.apache.lucene.search.IndexSearcher;
18 import org.apache.lucene.search.Query;
19 import org.apache.lucene.search.Searcher;
20 import org.apache.lucene.store.Directory;
21 import org.apache.lucene.store.RAMDirectory;
22 import org.mdarad.framework.delegates.BusinessDelegate;
23 import org.mdarad.framework.exception.SystemException;
24
25 abstract public class AbstractIndexDelegate implements BusinessDelegate {
26     public final static String JavaDoc DEFAULT_FIELD_NAME = "org.mdarad.framework.index.AbstractIndexFacade.DEFAULT_FIELD_NAME";
27     abstract public Map JavaDoc getEntityDocuments();
28     
29     Map JavaDoc directories = null;
30
31     public void buildIndex() throws SystemException {
32         try {
33             Map JavaDoc documents = getEntityDocuments();
34
35             Map JavaDoc newDirectories = new HashMap JavaDoc();
36             Iterator JavaDoc documentLocaleIterator = documents.keySet().iterator();
37             while(documentLocaleIterator.hasNext()) {
38                 Locale JavaDoc locale = (Locale JavaDoc) documentLocaleIterator.next();
39                 Directory directory = new RAMDirectory();
40                 newDirectories.put(locale, directory);
41                 Collection JavaDoc documentsForLocale = (Collection JavaDoc) documents.get(locale);
42
43                 IndexWriter indexWriter = new IndexWriter(directory, getAnalyzerer(locale), true);
44
45                 Iterator JavaDoc documentIterator = documentsForLocale.iterator();
46                 while(documentIterator.hasNext()) {
47                     indexWriter.addDocument((Document) documentIterator.next());
48                 }
49
50                 indexWriter.optimize();
51                 indexWriter.close();
52             }
53
54             directories = newDirectories;
55         } catch (IOException JavaDoc ioe) {
56             throw new SystemException(ioe);
57         }
58     }
59     
60     public Hits getSearchResults(String JavaDoc queryString, Locale JavaDoc locale) throws IndexNotFoundException {
61         Hits hits = null;
62         Directory directory = null;
63         
64         if(directories == null) throw new IndexNotFoundException("Directory map has not been initialized.");
65         
66         Map JavaDoc directories = this.directories;
67         if(directories != null) {
68             directory = (Directory) directories.get(locale);
69         }
70         
71         if(directory == null) throw new IndexNotFoundException("Directory map does not contain locale.");
72
73         Searcher searcher = null;
74         
75         try {
76             searcher = new IndexSearcher(directory);
77         } catch (IOException JavaDoc ioe) {
78             throw new IndexNotFoundException(ioe);
79         }
80         
81         Query query = null;
82         
83         try {
84             
85             query = QueryParser.parse(queryString, DEFAULT_FIELD_NAME, getAnalyzerer(locale));
86             
87         } catch (ParseException e) {
88             // TODO Auto-generated catch block
89 e.printStackTrace();
90         }
91         
92         try {
93             hits = searcher.search(query);
94         } catch (IOException JavaDoc e) {
95             // TODO Auto-generated catch block
96 e.printStackTrace();
97         }
98         
99         return hits;
100     }
101     
102     static Analyzer defaultAnalyzer = new StandardAnalyzer();
103     public Analyzer getAnalyzerer(Locale JavaDoc locale) {
104         // TODO : get right Analyzer
105 return defaultAnalyzer;
106     }
107 }
108
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