/*
* Copyright (c) 2007-2012 Concurrent, Inc. All Rights Reserved.
*
* Project and contact information: http://www.cascading.org/
*
* This file is part of the Cascading project.
*
* 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.
*/
package copa;
import org.apache.lucene.spatial.geohash.GeoHashUtils;
import cascading.flow.FlowProcess;
import cascading.operation.BaseOperation;
import cascading.operation.Function;
import cascading.operation.FunctionCall;
import cascading.tuple.Fields;
import cascading.tuple.Tuple;
import cascading.tuple.TupleEntry;
public class GeoHashFunction extends BaseOperation implements Function
{
protected Integer hash_length = 0;
public GeoHashFunction( Fields fieldDeclaration, Integer hash_length )
{
super( 1, fieldDeclaration );
this.hash_length = hash_length;
}
public void operate( FlowProcess flowProcess, FunctionCall functionCall )
{
TupleEntry argument = functionCall.getArguments();
Double lat = argument.getDouble( 0 );
Double lng = argument.getDouble( 1 );
GeoHashUtils ghu = new GeoHashUtils();
String geohash = ghu.encode( lat, lng );
Tuple result = new Tuple();
result.add( geohash.substring( 0, hash_length ) );
functionCall.getOutputCollector().add( result );
}
}