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Yosegi Hive library.
There is a newer version: 2.0.6_hive-1.2.1000.2.6.4.0-91
/**
 * 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 jp.co.yahoo.yosegi.message.parser.hive;

import jp.co.yahoo.yosegi.message.objects.PrimitiveObject;
import jp.co.yahoo.yosegi.message.parser.IParser;
import org.apache.hadoop.hive.serde2.objectinspector.MapObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.io.Text;

import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class HiveMapParser implements IHiveParser {

  private final MapObjectInspector mapObjectInspector;
  private final ObjectInspector childObjectInspector;
  private final IHivePrimitiveConverter childConverter;
  private final boolean childHasParser;
  private Map keyMapping = new HashMap();
  private Object row;

  /**
   * Initialize map information set.
   */
  public HiveMapParser( final MapObjectInspector mapObjectInspector ) {
    IHivePrimitiveConverter keyConverter = HivePrimitiveConverterFactory.get(
        mapObjectInspector.getMapKeyObjectInspector() );
    if ( ! ( keyConverter instanceof HiveStringPrimitiveConverter ) ) {
      throw new UnsupportedOperationException(
          "Map type key only supports String type : " + keyConverter.getClass().getName() );
    }

    this.mapObjectInspector = mapObjectInspector;
    childObjectInspector = mapObjectInspector.getMapValueObjectInspector();
    childConverter = HivePrimitiveConverterFactory.get( childObjectInspector );

    childHasParser = HiveParserFactory.hasParser( childObjectInspector );
  }

  @Override
  public void setObject( final Object row ) throws IOException {
    this.row = row;
    keyMapping.clear();
    Map map = mapObjectInspector.getMap( row );
    Iterator keyIterator = map.keySet().iterator();
    while ( keyIterator.hasNext() ) {
      Object keyObj = keyIterator.next();
      keyMapping.put( keyObj.toString() , keyObj );
    }
  }

  @Override
  public PrimitiveObject get(final String key ) throws IOException {
    return childConverter.get(
        mapObjectInspector.getMapValueElement( row , keyMapping.get( key ) ) );
  }

  @Override
  public PrimitiveObject get( final int index ) throws IOException {
    return get( Integer.toString( index ) );
  }

  @Override
  public IParser getParser( final String key ) throws IOException {
    Object childRow = mapObjectInspector.getMapValueElement( row , keyMapping.get( key ) );
    if ( childRow == null ) {
      return new HiveNullParser();
    }
    IHiveParser childParser =  HiveParserFactory.get( childObjectInspector );
    childParser.setObject( childRow );
    return childParser;
  }

  @Override
  public IParser getParser( final int index ) throws IOException {
    return getParser( Integer.toString( index ) );
  }

  @Override
  public String[] getAllKey() throws IOException {
    String[] keys = new String[keyMapping.size()];

    Iterator keyIterator = keyMapping.keySet().iterator();
    int index = 0;
    while ( keyIterator.hasNext() ) {
      keys[index] = keyIterator.next();
      index++;
    }

    return keys;
  }

  @Override
  public boolean containsKey( final String key ) throws IOException {
    return get( key ) != null;
  }

  @Override
  public int size() throws IOException {
    return mapObjectInspector.getMapSize( row );
  }

  @Override
  public boolean isArray() throws IOException {
    return false;
  }

  @Override
  public boolean isMap() throws IOException {
    return true;
  }

  @Override
  public boolean isStruct() throws IOException {
    return false;
  }

  @Override
  public boolean hasParser( final int index ) throws IOException {
    return childHasParser;
  }

  @Override
  public boolean hasParser( final String key ) throws IOException {
    return childHasParser;
  }

  @Override
  public Object toJavaObject() throws IOException {
    Map result = new HashMap();
    for ( String key : getAllKey() ) {
      if ( hasParser(key) ) {
        result.put( key , getParser(key).toJavaObject() );
      } else {
        result.put( key , get(key) );
      }
    }

    return result;
  }

}