/*
* Copyright (c) 2007-2014 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 cascading.flow.iso.graph;
import java.util.HashMap;
import java.util.Map;
import cascading.flow.iso.NonTap;
import cascading.flow.planner.graph.FlowElementGraph;
import cascading.operation.Function;
import cascading.operation.Identity;
import cascading.operation.regex.RegexSplitter;
import cascading.pipe.Each;
import cascading.pipe.HashJoin;
import cascading.pipe.Merge;
import cascading.pipe.Pipe;
import cascading.tuple.Fields;
/**
*
*/
public class HashJoinsIntoMerge extends FlowElementGraph
{
public HashJoinsIntoMerge()
{
Map sources = new HashMap();
sources.put( "lower", new NonTap( "lower", new Fields( "offset", "line" ) ) );
sources.put( "upper", new NonTap( "upper", new Fields( "offset", "line" ) ) );
sources.put( "lhs", new NonTap( "lhs", new Fields( "offset", "line" ) ) );
sources.put( "rhs", new NonTap( "rhs", new Fields( "offset", "line" ) ) );
Map sinks = new HashMap();
sinks.put( "sink", new NonTap( "sink", new Fields( "offset", "line" ) ) );
Function splitter = new RegexSplitter( new Fields( "num", "char" ), " " );
Pipe pipeLower = new Each( new Pipe( "lower" ), new Fields( "line" ), splitter );
Pipe pipeUpper = new Each( new Pipe( "upper" ), new Fields( "line" ), splitter );
Pipe pipeLhs = new Each( new Pipe( "lhs" ), new Fields( "line" ), splitter );
Pipe pipeRhs = new Each( new Pipe( "rhs" ), new Fields( "line" ), splitter );
Pipe upperLower = new HashJoin( pipeLower, new Fields( "num" ), pipeUpper, new Fields( "num" ), new Fields( "num1", "char1", "num2", "char2" ) );
upperLower = new Each( upperLower, new Identity() );
Pipe lhsRhs = new HashJoin( pipeLhs, new Fields( "num" ), pipeRhs, new Fields( "num" ), new Fields( "num1", "char1", "num2", "char2" ) );
lhsRhs = new Each( lhsRhs, new Identity() );
Pipe merge = new Merge( "sink", Pipe.pipes( upperLower, lhsRhs ) );
initialize( sources, sinks, merge );
}
}