001/*
002 * Copyright (c) 2007-2015 Concurrent, Inc. All Rights Reserved.
003 *
004 * Project and contact information: http://www.cascading.org/
005 *
006 * This file is part of the Cascading project.
007 *
008 * Licensed under the Apache License, Version 2.0 (the "License");
009 * you may not use this file except in compliance with the License.
010 * You may obtain a copy of the License at
011 *
012 *     http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 */
020
021package cascading.flow.planner.iso.expression;
022
023import cascading.flow.FlowElement;
024import cascading.operation.Operation;
025import cascading.pipe.Operator;
026
027/**
028 *
029 */
030public class OperationExpression extends TypeExpression<Operation>
031  {
032  public OperationExpression( ElementCapture capture, boolean exact, Class<? extends Operation> type )
033    {
034    super( capture, exact, type );
035    }
036
037  public OperationExpression( ElementCapture capture, Class<? extends Operation> type )
038    {
039    super( capture, type );
040    }
041
042  public OperationExpression( boolean exact, Class<? extends Operation> type )
043    {
044    super( exact, type );
045    }
046
047  public OperationExpression( Class<? extends Operation> type )
048    {
049    super( type );
050    }
051
052  @Override
053  protected Class<? extends Operation> getType( FlowElement flowElement )
054    {
055    if( !( flowElement instanceof Operator ) )
056      return null;
057
058    return ( (Operator) flowElement ).getOperation().getClass();
059    }
060  }