/*
* 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.iso.assertion;
import cascading.flow.planner.PlannerContext;
import cascading.flow.planner.graph.ElementGraph;
import cascading.flow.planner.iso.expression.ExpressionGraph;
import cascading.flow.planner.iso.finder.GraphFinder;
import cascading.flow.planner.iso.finder.Match;
import cascading.flow.planner.iso.transformer.Transformed;
/**
* TODO: add level for warning or error, and fail on errors
*/
public abstract class GraphAssert<E extends ElementGraph>
{
private final GraphFinder finder;
private final String message;
public GraphAssert( ExpressionGraph expressionGraph, String message )
{
this.finder = new GraphFinder( expressionGraph );
this.message = message;
}
protected abstract Transformed transform( PlannerContext plannerContext, E graph );
public Asserted assertion( PlannerContext plannerContext, E graph )
{
Transformed<E> transform = transform( plannerContext, graph );
if( transform != null && transform.getEndGraph() != null )
graph = transform.getEndGraph();
Match match = finder.findFirstMatch( plannerContext, graph );
Asserted asserted = new Asserted( plannerContext, this, graph, message, match );
if( transform != null )
asserted.addChildTransform( transform );
return asserted;
}
}