    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  }