content: /*
   * 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.hadoop.chukwa;
  
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  
  import org.apache.pig.EvalFunc;
  import org.apache.pig.data.DataBag;
  import org.apache.pig.data.DataType;
  import org.apache.pig.data.Tuple;
  import org.apache.pig.impl.logicalLayer.FrontendException;
  import org.apache.pig.impl.logicalLayer.schema.Schema;
  
  /**
   * return time,Map
   * 
   */
  public class RecordMerger extends EvalFunc<Map<String,Object>> {
    
    @SuppressWarnings("unchecked")
    @Override
    public Map<String,Object> exec(Tuple input) throws IOException {
      
      Map<String, Object> newPigMapFields = new HashMap<String, Object>();
      DataBag bg = (DataBag) input.get(0);
      Iterator<Tuple> bagIterator = bg.iterator();
      Object s = null;
      while (bagIterator.hasNext()) {
  
        Map<Object, Object> map = (Map<Object,Object>) bagIterator.next().get(0);
        Iterator<Object> mapIterator = map.keySet().iterator();
        while (mapIterator.hasNext()) {
          s = mapIterator.next();
          newPigMapFields.put(s.toString(), map.get(s));
        }
      }
  
      return newPigMapFields;
    }
  
    @Override
    public Schema outputSchema(Schema input) {
      Schema schema = null;
      try {
        schema = new Schema(new Schema.FieldSchema(input.getField(0).alias, DataType.MAP));
      } catch (FrontendException e) {
        e.printStackTrace();
      }
      return schema;
    }
  }
  