/**
* Copyright 2005 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
*/
package org.apache.nutch.indexer.basic;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.nutch.parse.Parse;
import org.apache.nutch.indexer.IndexingFilter;
import org.apache.nutch.indexer.IndexingException;
import org.apache.hadoop.io.UTF8;
import org.apache.nutch.crawl.CrawlDatum;
import org.apache.nutch.crawl.Inlinks;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.hadoop.conf.Configuration;
/** Adds basic searchable fields to a document. */
public class BasicIndexingFilter implements IndexingFilter {
public static final Log LOG = LogFactory.getLog(BasicIndexingFilter.class);
private int MAX_TITLE_LENGTH;
private Configuration conf;
public Document filter(Document doc, Parse parse, UTF8 url, CrawlDatum datum, Inlinks inlinks)
throws IndexingException {
String host = null;
try {
URL u = new URL(url.toString());
host = u.getHost();
} catch (MalformedURLException e) {
throw new IndexingException(e);
}
if (host != null) {
// add host as un-stored, indexed and tokenized
doc.add(new Field("host", host, Field.Store.NO, Field.Index.TOKENIZED));
// add site as un-stored, indexed and un-tokenized
doc.add(new Field("site", host, Field.Store.NO, Field.Index.UN_TOKENIZED));
}
// url is both stored and indexed, so it's both searchable and returned
doc.add(new Field("url", url.toString(), Field.Store.YES, Field.Index.TOKENIZED));
// content is indexed, so that it's searchable, but not stored in index
doc.add(new Field("content", parse.getText(), Field.Store.NO, Field.Index.TOKENIZED));
// anchors are indexed, so they're searchable, but not stored in index
try {
String[] anchors = (inlinks != null ? inlinks.getAnchors() : new String[0]);
for (int i = 0; i < anchors.length; i++) {
doc.add(new Field("anchor", anchors[i], Field.Store.NO, Field.Index.TOKENIZED));
}
} catch (IOException ioe) {
if (LOG.isWarnEnabled()) {
LOG.warn("BasicIndexingFilter: can't get anchors for " + url.toString());
}
}
// title
String title = parse.getData().getTitle();
if (title.length() > MAX_TITLE_LENGTH) { // truncate title if needed
title = title.substring(0, MAX_TITLE_LENGTH);
}
// add title indexed and stored so that it can be displayed
doc.add(new Field("title", title, Field.Store.YES, Field.Index.TOKENIZED));
return doc;
}
public void setConf(Configuration conf) {
this.conf = conf;
this.MAX_TITLE_LENGTH = conf.getInt("indexer.max.title.length", 100);
}
public Configuration getConf() {
return this.conf;
}
}