/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.api.java.typeutils.runtime;
import eu.stratosphere.api.common.typeutils.TypeComparator;
import eu.stratosphere.api.common.typeutils.TypeComparatorFactory;
import eu.stratosphere.configuration.Configuration;
import eu.stratosphere.util.InstantiationUtil;
public final class RuntimeComparatorFactory<T> implements TypeComparatorFactory<T>, java.io.Serializable {
private static final long serialVersionUID = 1L;
private static final String CONFIG_KEY = "SER_DATA";
private TypeComparator<T> comparator;
public RuntimeComparatorFactory() {}
public RuntimeComparatorFactory(TypeComparator<T> comparator) {
this.comparator = comparator;
}
@Override
public void writeParametersToConfig(Configuration config) {
try {
InstantiationUtil.writeObjectToConfig(comparator, config, CONFIG_KEY);
}
catch (Exception e) {
throw new RuntimeException("Could not serialize comparator into the configuration.", e);
}
}
@SuppressWarnings("unchecked")
@Override
public void readParametersFromConfig(Configuration config, ClassLoader cl) throws ClassNotFoundException {
try {
comparator = (TypeComparator<T>) InstantiationUtil.readObjectFromConfig(config, CONFIG_KEY, cl);
}
catch (ClassNotFoundException e) {
throw e;
}
catch (Exception e) {
throw new RuntimeException("Could not serialize serializer into the configuration.", e);
}
}
@Override
public TypeComparator<T> createComparator() {
if (comparator != null) {
return comparator;
} else {
throw new RuntimeException("ComparatorFactory has not been initialized from configuration.");
}
}
}