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* Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.*; import org.apache.lucene.document.*; import org.apache.lucene.demo.html.HTMLParser; /** A utility for making Lucene Documents for HTML documents. */ public class HTMLDocument { static char dirSep = System.getProperty("file.separator").charAt(0); public static String uid(File f) { // Append path and date into a string in such a way that lexicographic // sorting gives the same results as a walk of the file hierarchy. // separate the path from the date. return f.getPath().replace(dirSep, '\u0000') + "\u0000" + DateField.timeToString(f.lastModified()); } public static String uid2url(String uid) { String url = uid.replace('\u0000', '/'); // replace nulls with slashes return url.substring(0, url.lastIndexOf('/')); // remove date from end } public static Document Document(File f) throws IOException, InterruptedException { // make a new, empty document Document doc = new Document(); // Add the url as a field named "url". Use an UnIndexed field, so Thus // null (\u0000) is used both to separate directory components and to
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// that the url is just stored with the document, but is not searchable. doc.add(Field.UnIndexed("url", f.getPath().replace(dirSep, '/')));
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// Add the last modified date of the file a field named "modified". // to tokenize the field into words. doc.add( Field.Keyword( "modified", DateField.timeToString(f.lastModified()))); // Add the uid as a field, so that the index can be incrementally // maintained.
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// Keyword field, so that it's searchable, but so that no attempt is made
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// This field is not stored with the document; it is indexed, but it is // not tokenized prior to indexing. doc.add(new Field("uid", uid(f), false, true, false)); HTMLParser parser = new HTMLParser(f); // Add the tag-stripped contents as a Reader-valued Text field so it will // get tokenized and indexed. doc.add(Field.Text("contents", parser.getReader())); // Add the summary as an UnIndexed field, so that it is stored and // returned with hit documents for display. doc.add(Field.UnIndexed("summary", parser.getSummary())); // Add the title as a separate Text field, so that it can be searched // separately. doc.add(Field.Text("title", parser.getTitle())); // return the document return doc; } private HTMLDocument() { } }
Adding Documents with the IndexWriter
After we create the Lucene document from the file, we need to add the document to the index. We call the addDocument() method on the instance of the IndexWriter we created:
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// add the document to the index try { Document doc = HTMLDocument.Document(file); writer.addDocument(doc); } catch (IOException e) { System.out.println("Error adding document: " + e.getMessage()); } catch (InterruptedException e) { System.out.println("Error adding document: " + e.getMessage()); }
Lucene makes adding documents to the index easy.
Optimizing and Closing the Index
The last step is to optimize the index, which means that Lucene will merge all of the different segment files it stored in the directory into one file. This improves the performance of queries. We also close the IndexWriter, which removes the lock from the index directory. We are using the index directory as the lock directory instead of the default Java temporary directory because our portlet does not share the same Java temporary directory when it runs on Pluto.
//optimize the index writer.optimize(); //close the index writer.close();
If you do not remember to call the close() method, your future index updates will fail because of the lock file.
Indexer Java Class
Here is our completed Lucene indexer class:
package com.portalbook.search; import java.io.*;
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import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.analysis.standard.StandardAnalyzer; import org.apache.lucene.demo.HTMLDocument; import org.apache.lucene.document.Document; import org.apache.lucene.index.IndexWriter; public class Indexer { protected IndexWriter writer = null; protected Analyzer analyzer = new StandardAnalyzer(); public void init(String indexPath) throws IOException { //set Lucene lockdir System.setProperty("org.apache.lucene.lockdir", indexPath); //create a new Lucene index, overwriting the existing one. writer = new IndexWriter(indexPath, analyzer, true); } public void indexFiles(String contentPath) throws IOException { File contentDir = new File(contentPath); if (!contentDir.exists()) { throw new IOException("Content directory does not exist."); } if (!contentDir.isDirectory()) { System.out.println(contentPath + " is not a directory."); return; } File[] indexableFiles = contentDir.listFiles(); { if (indexableFiles != null) { for (int ctr = 0; ctr < indexableFiles.length; ctr++) { if (indexableFiles[ctr].isFile()) {
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