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.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 }