/**
* 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.searcher;
// Commons Logging imports
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
// Hadoop imports
import org.apache.hadoop.conf.Configuration;
// Nutch imports
import org.apache.nutch.plugin.Extension;
import org.apache.nutch.plugin.PluginRepository;
/**
* A factory for retrieving {@link Summarizer} extensions.
*
* @author Jérôme Charron
*/
public class SummarizerFactory {
/** My logger */
public final static Log LOG = LogFactory.getLog(SummarizerFactory.class);
/** The first available {@link Summarizer} */
private Summarizer summarizer = null;
public SummarizerFactory(Configuration conf) {
try {
Extension[] extensions = PluginRepository
.get(conf)
.getExtensionPoint(Summarizer.X_POINT_ID)
.getExtensions();
summarizer = (Summarizer) extensions[0].getExtensionInstance();
if (LOG.isInfoEnabled()) {
LOG.info("Using the first summarizer extension found: " +
extensions[0].getId());
}
} catch (Exception e) {
if (LOG.isWarnEnabled()) { LOG.warn(e.toString()); }
}
}
/**
* Get the first available {@link Summarizer} extension.
* @return the first available {@link Summarizer} extension, or
* <code>null</code> if none available.
*/
public Summarizer getSummarizer() {
return summarizer;
}
}