/*
* 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.planner.graph;
import java.util.Set;
import cascading.flow.planner.Scope;
import cascading.pipe.Pipe;
/**
*
*/
public class Extent extends Pipe
{
/** Field head */
public static final Extent head = new Extent( "head" );
/** Field tail */
public static final Extent tail = new Extent( "tail" );
private Extent( String name )
{
super( name );
}
@Override
public Scope outgoingScopeFor( Set<Scope> scopes )
{
return new Scope();
}
@Override
public String toString()
{
return "[" + getName() + "]";
}
@Override
public boolean equals( Object object )
{
if( object == null )
return false;
if( this == object )
return true;
if( object.getClass() != this.getClass() )
return false;
return this.getName().equals( ( (Pipe) object ).getName() );
}
}