AggregateCharCount.java

/*
 * 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 com.aliyun.odps.udf.local.examples;

import com.aliyun.odps.io.LongWritable;
import com.aliyun.odps.io.Text;
import com.aliyun.odps.io.Writable;
import com.aliyun.odps.udf.Aggregator;
import com.aliyun.odps.udf.UDFException;

public class AggregateCharCount extends Aggregator {

  @Override
  public void iterate(Writable arg0, Writable[] arg1) throws UDFException {
    LongWritable result = (LongWritable) arg0;
    for (Writable item : arg1) {
      Text txt = (Text) item;
      result.set(result.get() + txt.getLength());
    }

  }

  @Override
  public void merge(Writable arg0, Writable arg1) throws UDFException {
    LongWritable result = (LongWritable) arg0;
    LongWritable partial = (LongWritable) arg1;
    result.set(result.get() + partial.get());

  }

  @Override
  public Writable newBuffer() {
    return new LongWritable(0L);
  }

  @Override
  public Writable terminate(Writable arg0) throws UDFException {
    return arg0;
  }

}