/**
* 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.feed;
//JDK imports
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
//APACHE imports
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Text;
import org.apache.nutch.crawl.CrawlDatum;
import org.apache.nutch.crawl.Inlinks;
import org.apache.nutch.indexer.IndexingException;
import org.apache.nutch.indexer.IndexingFilter;
import org.apache.nutch.indexer.NutchDocument;
import org.apache.nutch.indexer.lucene.LuceneWriter;
import org.apache.nutch.metadata.Feed;
import org.apache.nutch.metadata.Metadata;
import org.apache.nutch.parse.Parse;
import org.apache.nutch.parse.ParseData;
/**
* @author dogacan
* @author mattmann
* @since NUTCH-444
*
* An {@link IndexingFilter} implementation to pull out the
* relevant extracted {@link Metadata} fields from the RSS feeds
* and into the index.
*
*/
public class FeedIndexingFilter implements IndexingFilter {
public static final String dateFormatStr = "yyyyMMddHHmm";
private Configuration conf;
private final static String PUBLISHED_DATE = "publishedDate";
private final static String UPDATED_DATE = "updatedDate";
/**
* Extracts out the relevant fields:
*
* <ul>
* <li>FEED_AUTHOR</li>
* <li>FEED_TAGS</li>
* <li>FEED_PUBLISHED</li>
* <li>FEED_UPDATED</li>
* <li>FEED</li>
* </ul>
*
* And sends them to the {@link Indexer} for indexing within the Nutch
* index.
*
*/
public NutchDocument filter(NutchDocument doc, Parse parse, Text url, CrawlDatum datum,
Inlinks inlinks) throws IndexingException {
ParseData parseData = parse.getData();
Metadata parseMeta = parseData.getParseMeta();
String[] authors = parseMeta.getValues(Feed.FEED_AUTHOR);
String[] tags = parseMeta.getValues(Feed.FEED_TAGS);
String published = parseMeta.get(Feed.FEED_PUBLISHED);
String updated = parseMeta.get(Feed.FEED_UPDATED);
String feed = parseMeta.get(Feed.FEED);
if (authors != null) {
for (String author : authors) {
doc.add(Feed.FEED_AUTHOR, author);
}
}
if (tags != null) {
for (String tag : tags) {
doc.add(Feed.FEED_TAGS, tag);
}
}
if (feed != null)
doc.add(Feed.FEED, feed);
SimpleDateFormat sdf = new SimpleDateFormat(dateFormatStr);
sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
if (published != null) {
Date date = new Date(Long.parseLong(published));
String dateString = sdf.format(date);
doc.add(PUBLISHED_DATE, dateString);
}
if (updated != null) {
Date date = new Date(Long.parseLong(updated));
String dateString = sdf.format(date);
doc.add(UPDATED_DATE, dateString);
}
return doc;
}
/**
* @return the {@link Configuration} object used to configure
* this {@link IndexingFilter}.
*/
public Configuration getConf() {
return conf;
}
public void addIndexBackendOptions(Configuration conf) {
LuceneWriter.addFieldOptions(Feed.FEED_AUTHOR,
LuceneWriter.STORE.YES, LuceneWriter.INDEX.TOKENIZED, conf);
LuceneWriter.addFieldOptions(Feed.FEED_TAGS,
LuceneWriter.STORE.YES, LuceneWriter.INDEX.TOKENIZED, conf);
LuceneWriter.addFieldOptions(Feed.FEED,
LuceneWriter.STORE.YES, LuceneWriter.INDEX.TOKENIZED, conf);
LuceneWriter.addFieldOptions(PUBLISHED_DATE,
LuceneWriter.STORE.YES, LuceneWriter.INDEX.NO_NORMS, conf);
LuceneWriter.addFieldOptions(UPDATED_DATE,
LuceneWriter.STORE.YES, LuceneWriter.INDEX.NO_NORMS, conf);
}
/**
* Sets the {@link Configuration} object used to configure this
* {@link IndexingFilter}.
*
* @param conf The {@link Configuration} object used to configure
* this {@link IndexingFilter}.
*/
public void setConf(Configuration conf) {
this.conf = conf;
}
}