/*
* 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 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 RoadSegmentFunction extends BaseOperation implements Function
{
public RoadSegmentFunction( Fields fieldDeclaration )
{
super( 1, fieldDeclaration );
}
public void operate( FlowProcess flowProcess, FunctionCall functionCall )
{
TupleEntry argument = functionCall.getArguments();
String[] geo_list = argument.getString( 0 ).split( "\\s" );
for( int i = 0; i < ( geo_list.length - 1 ); i++ )
{
String[] p0 = geo_list[i].split( "," );
Double lng0 = new Double( p0[0] );
Double lat0 = new Double( p0[1] );
Double alt0 = new Double( p0[2] );
String[] p1 = geo_list[i + 1].split( "," );
Double lng1 = new Double( p1[0] );
Double lat1 = new Double( p1[1] );
Double alt1 = new Double( p1[2] );
Double lat_mid = ( lat0 + lat1 ) / 2.0;
Double lng_mid = ( lng0 + lng1 ) / 2.0;
Tuple result = new Tuple();
result.add( lat0 );
result.add( lng0 );
result.add( alt0 );
result.add( lat1 );
result.add( lng1 );
result.add( alt1 );
result.add( lat_mid );
result.add( lng_mid );
functionCall.getOutputCollector().add( result );
}
}
}