/* Copyright (C) 2012 Intel Corporation.
* All rights reserved.
*
* 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.
*
* For more about this software visit:
* http://www.01.org/GraphBuilder
*/
package com.intel.hadoop.graphbuilder.preprocess.functional;
import java.lang.reflect.ParameterizedType;
import org.apache.hadoop.mapred.JobConf;
import com.intel.hadoop.graphbuilder.types.IntType;
/**
* Represents a counting functional: f x y -> y + 1
*
*
* @param <T>
*/
public class CountFunc<T> implements Functional<T, IntType> {
@Override
public void configure(JobConf job) throws Exception {
}
@Override
public IntType reduce(T a, IntType b) {
return new IntType(b.get() + 1);
}
@Override
public Class<T> getInType() {
return (Class) ((ParameterizedType) this.getClass().getGenericSuperclass())
.getActualTypeArguments()[0];
}
@Override
public Class<IntType> getOutType() {
return IntType.class;
}
@Override
public IntType base() {
return IntType.ZERO;
}
}