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 /*
  * 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.pig;
This class is used to provide a free implementation of the EvalFunc exec function given implementation of the Accumulator interface. Instead of having to provide a redundant implementation, this provides the base exec function for free, given that the methods associated with the Accumulator interface are implemented. For information on how to implement Accumulator, see Accumulator.
public abstract class AccumulatorEvalFunc<T> extends EvalFunc<T> implements Accumulator<T> {
    @Override
    public abstract void accumulate(Tuple bthrows IOException;
    @Override
    public abstract void cleanup();
    @Override
    public abstract T getValue();
    @Override
    public T exec(Tuple inputthrows IOException {
        accumulate(input);
        T result = getValue();
        cleanup();
        return result;
    }
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