org.apache.nutch.indexer.IndexingFilters Maven / Gradle / Ivy
/*
* 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;
import org.apache.nutch.plugin.PluginRepository;
import org.apache.nutch.parse.Parse;
import org.apache.hadoop.conf.Configuration;
import org.apache.nutch.crawl.CrawlDatum;
import org.apache.nutch.crawl.Inlinks;
import org.apache.hadoop.io.Text;
/** Creates and caches {@link IndexingFilter} implementing plugins. */
public class IndexingFilters {
public static final String INDEXINGFILTER_ORDER = "indexingfilter.order";
private IndexingFilter[] indexingFilters;
public IndexingFilters(Configuration conf) {
indexingFilters = (IndexingFilter[]) PluginRepository.get(conf)
.getOrderedPlugins(IndexingFilter.class, IndexingFilter.X_POINT_ID,
INDEXINGFILTER_ORDER);
}
/** Run all defined filters. */
public NutchDocument filter(NutchDocument doc, Parse parse, Text url,
CrawlDatum datum, Inlinks inlinks) throws IndexingException {
for (int i = 0; i < this.indexingFilters.length; i++) {
doc = this.indexingFilters[i].filter(doc, parse, url, datum, inlinks);
// break the loop if an indexing filter discards the doc
if (doc == null)
return null;
}
return doc;
}
}