    001/*
    002 * Copyright (c) 2007-2016 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.assertion;
    022
    023import cascading.flow.planner.PlannerContext;
    024import cascading.flow.planner.graph.ElementGraph;
    025import cascading.flow.planner.iso.expression.ExpressionGraph;
    026import cascading.flow.planner.iso.finder.GraphFinder;
    027import cascading.flow.planner.iso.finder.Match;
    028import cascading.flow.planner.iso.transformer.Transformed;
    029
    030/**
    031 * TODO: add level for warning or error, and fail on errors
    032 */
    033public abstract class GraphAssert<E extends ElementGraph>
    034  {
    035  public enum AssertionType
    036    {
    037      Unsupported,
    038      Illegal
    039    }
    040
    041  private final GraphFinder finder;
    042  private final String message;
    043  private AssertionType assertionType = AssertionType.Illegal;
    044
    045  public GraphAssert( ExpressionGraph expressionGraph, String message )
    046    {
    047    this( expressionGraph, message, null );
    048    }
    049
    050  public GraphAssert( ExpressionGraph expressionGraph, String message, AssertionType assertionType )
    051    {
    052    this.finder = new GraphFinder( expressionGraph );
    053    this.message = message;
    054
    055    if( assertionType != null )
    056      this.assertionType = assertionType;
    057    }
    058
    059  protected abstract Transformed transform( PlannerContext plannerContext, E graph );
    060
    061  public Asserted assertion( PlannerContext plannerContext, E graph )
    062    {
    063    Transformed<E> transform = transform( plannerContext, graph );
    064
    065    if( transform != null && transform.getEndGraph() != null )
    066      graph = transform.getEndGraph();
    067
    068    Match match = finder.findFirstMatch( plannerContext, graph );
    069
    070    Asserted asserted = new Asserted( plannerContext, this, graph, message, assertionType, match );
    071
    072    if( transform != null )
    073      asserted.addChildTransform( transform );
    074
    075    return asserted;
    076    }
    077  }