/*
* Copyright 2004-2009 the original author or authors.
*
* Licensed 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.compass.core.lucene.engine.merge.policy;
import org.apache.lucene.index.MergePolicy;
import org.compass.core.config.CompassSettings;
import org.compass.core.config.ConfigurationException;
import org.compass.core.lucene.LuceneEnvironment;
import org.compass.core.util.ClassUtils;
/**
* A {@link org.apache.lucene.index.MergePolicy} factory creating based on the type of the provider
* the actual implementation of {@link org.compass.core.lucene.engine.merge.policy.MergePolicyProvider}
* and then using it to create the merge factory.
*
* @author kimchy
*/
public class MergePolicyFactory {
public static MergePolicy createMergePolicy(CompassSettings settings) throws ConfigurationException {
String type = settings.getSetting(LuceneEnvironment.MergePolicy.TYPE, LuceneEnvironment.MergePolicy.LogByteSize.NAME);
MergePolicyProvider provider;
if (type.equals(LuceneEnvironment.MergePolicy.LogByteSize.NAME)) {
provider = new LogByteSizeMergePolicyProvider();
} else if (type.equals(LuceneEnvironment.MergePolicy.LogDoc.NAME)) {
provider = new LogDocMergePolicyProvider();
} else {
try {
provider = (MergePolicyProvider) ClassUtils.forName(type, settings.getClassLoader()).newInstance();
} catch (Exception e) {
throw new ConfigurationException("Failed to load/create merge policy provider [" + type + "]", e);
}
}
return provider.create(settings);
}
}