forked from cwensel/cascading.multitool
/
ConcatFactory.java
65 lines (55 loc) · 1.66 KB
/
ConcatFactory.java
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/*
* 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 multitool.factory;
import java.util.Map;
import cascading.operation.text.FieldJoiner;
import cascading.pipe.Each;
import cascading.pipe.Pipe;
import cascading.tuple.Fields;
/**
*
*/
public class ConcatFactory extends PipeFactory
{
public ConcatFactory( String alias )
{
super( alias );
}
public String getUsage()
{
return "join the given fields, will join ALL by default";
}
public String[] getParameters()
{
return new String[]{"delim"};
}
public String[] getParametersUsage()
{
return new String[]{"delimiter, defaut: '\\t' (TAB)"};
}
public Pipe addAssembly( String value, Map<String, String> subParams, Map<String, Pipe> pipes, Pipe pipe )
{
Fields fields = asFields( value );
String delim = getString( subParams, "delim", "\t" );
if( fields == null )
fields = Fields.ALL;
return new Each( pipe, fields, new FieldJoiner( delim ) );
}
}