/*
* 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.hadoop.conf.Configuration;
public class NutchIndexWriterFactory {
@SuppressWarnings("unchecked")
public static NutchIndexWriter[] getNutchIndexWriters(Configuration conf) {
final String[] classes = conf.getStrings("indexer.writer.classes");
final NutchIndexWriter[] writers = new NutchIndexWriter[classes.length];
for (int i = 0; i < classes.length; i++) {
final String clazz = classes[i];
try {
final Class<NutchIndexWriter> implClass =
(Class<NutchIndexWriter>) Class.forName(clazz);
writers[i] = implClass.newInstance();
} catch (final Exception e) {
throw new RuntimeException("Couldn't create " + clazz, e);
}
}
return writers;
}
public static void addClassToConf(Configuration conf,
Class<? extends NutchIndexWriter> clazz) {
final String classes = conf.get("indexer.writer.classes");
final String newClass = clazz.getName();
if (classes == null) {
conf.set("indexer.writer.classes", newClass);
} else {
conf.set("indexer.writer.classes", classes + "," + newClass);
}
}
}