/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.DateTools;
import org.apache.nutch.metadata.Nutch;
import org.apache.nutch.parse.Parse;
import org.apache.nutch.indexer.IndexingFilter;
import org.apache.nutch.indexer.IndexingException;
import org.apache.nutch.indexer.NutchDocument;
import org.apache.nutch.indexer.lucene.LuceneWriter;
import org.apache.hadoop.io.Text;
import org.apache.nutch.crawl.CrawlDatum;
import org.apache.nutch.crawl.Inlinks;
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 NutchDocument filter(NutchDocument doc, Parse parse, Text url, CrawlDatum datum, Inlinks inlinks)
throws IndexingException {
Text reprUrl = (Text) datum.getMetaData().get(Nutch.WRITABLE_REPR_URL_KEY);
String reprUrlString = reprUrl != null ? reprUrl.toString() : null;
String urlString = url.toString();
String host = null;
try {
URL u;
if (reprUrlString != null) {
u = new URL(reprUrlString);
} else {
u = new URL(urlString);
}
host = u.getHost();
} catch (MalformedURLException e) {
throw new IndexingException(e);
}
if (host != null) {
doc.add("host", host);
doc.add("site", host);
}
doc.add("url", reprUrlString == null ? urlString : reprUrlString);
doc.add("content", parse.getText());
// title
String title = parse.getData().getTitle();
if (title.length() > MAX_TITLE_LENGTH) { // truncate title if needed
title = title.substring(0, MAX_TITLE_LENGTH);
}
doc.add("title", title);
// add cached content/summary display policy, if available
String caching = parse.getData().getMeta(Nutch.CACHING_FORBIDDEN_KEY);
if (caching != null && !caching.equals(Nutch.CACHING_FORBIDDEN_NONE)) {
doc.add("cache", caching);
}
// add timestamp when fetched, for deduplication
doc.add("tstamp",
DateTools.timeToString(datum.getFetchTime(),
DateTools.Resolution.MILLISECOND));
return doc;
}
public void addIndexBackendOptions(Configuration conf) {
///////////////////////////
// add lucene options //
///////////////////////////
// host is un-stored, indexed and tokenized
LuceneWriter.addFieldOptions("host", LuceneWriter.STORE.NO,
LuceneWriter.INDEX.TOKENIZED, conf);
// site is un-stored, indexed and un-tokenized
LuceneWriter.addFieldOptions("site", LuceneWriter.STORE.NO,
LuceneWriter.INDEX.UNTOKENIZED, conf);
// url is both stored and indexed, so it's both searchable and returned
LuceneWriter.addFieldOptions("url", LuceneWriter.STORE.YES,
LuceneWriter.INDEX.TOKENIZED, conf);
// content is indexed, so that it's searchable, but not stored in index
LuceneWriter.addFieldOptions("content", LuceneWriter.STORE.NO,
LuceneWriter.INDEX.TOKENIZED, conf);
// anchors are indexed, so they're searchable, but not stored in index
LuceneWriter.addFieldOptions("anchor", LuceneWriter.STORE.NO,
LuceneWriter.INDEX.TOKENIZED, conf);
// title is indexed and stored so that it can be displayed
LuceneWriter.addFieldOptions("title", LuceneWriter.STORE.YES,
LuceneWriter.INDEX.TOKENIZED, conf);
LuceneWriter.addFieldOptions("cache", LuceneWriter.STORE.YES, LuceneWriter.INDEX.NO, conf);
LuceneWriter.addFieldOptions("tstamp", LuceneWriter.STORE.YES, LuceneWriter.INDEX.NO, conf);
}
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;
}
}