001/* 002 * Copyright (c) 2007-2017 Xplenty, 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.rule.transformer; 022 023import cascading.flow.planner.iso.expression.ExpressionGraph; 024import cascading.flow.planner.iso.transformer.ReplaceGraphFactoryBasedTransformer; 025import cascading.flow.planner.rule.PlanPhase; 026import cascading.flow.planner.rule.RuleExpression; 027import cascading.flow.planner.rule.RuleTransformer; 028 029/** 030 * RuleTransformer that uses the supplied expression to fetch the FlowElement to replace. 031 * The replacement FlowElement is created using the supplied factory. 032 */ 033public class RuleReplaceFactoryBasedTransformer extends RuleTransformer 034 { 035 public RuleReplaceFactoryBasedTransformer( PlanPhase phase, RuleExpression ruleExpression, String factoryName ) 036 { 037 super( phase, ruleExpression ); 038 039 ExpressionGraph matchExpression = ruleExpression.getMatchExpression(); 040 041 if( subGraphTransformer != null ) 042 graphTransformer = new ReplaceGraphFactoryBasedTransformer( subGraphTransformer, matchExpression, factoryName ); 043 else if( contractedTransformer != null ) 044 graphTransformer = new ReplaceGraphFactoryBasedTransformer( contractedTransformer, matchExpression, factoryName ); 045 else 046 graphTransformer = new ReplaceGraphFactoryBasedTransformer( matchExpression, factoryName ); 047 } 048 }