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.transformer; 022 023import java.util.Set; 024 025import cascading.flow.FlowElement; 026import cascading.flow.planner.graph.AnnotatedGraph; 027import cascading.flow.planner.graph.ElementGraph; 028import cascading.flow.planner.graph.ElementMultiGraph; 029import cascading.flow.planner.iso.ElementAnnotation; 030import cascading.flow.planner.iso.expression.ExpressionGraph; 031import cascading.flow.planner.iso.finder.Match; 032import cascading.util.ProcessLogger; 033 034/** 035 * 036 */ 037public class AnnotateGraphTransformer extends RecursiveGraphTransformer<ElementGraph> 038 { 039 private final ElementAnnotation annotation; 040 041 protected final GraphTransformer graphTransformer; 042 043 public AnnotateGraphTransformer( ExpressionGraph match, ElementAnnotation annotation ) 044 { 045 super( match ); 046 this.annotation = annotation; 047 this.graphTransformer = null; 048 } 049 050 public AnnotateGraphTransformer( GraphTransformer graphTransformer, ExpressionGraph match, ElementAnnotation annotation ) 051 { 052 super( match ); 053 this.annotation = annotation; 054 this.graphTransformer = graphTransformer; 055 } 056 057 @Override 058 protected boolean requiresRecursiveSearch() 059 { 060 return graphTransformer != null || super.requiresRecursiveSearch(); 061 } 062 063 @Override 064 protected ElementGraph prepareForMatch( ProcessLogger processLogger, Transformed<ElementGraph> transformed, ElementGraph graph ) 065 { 066 if( graphTransformer == null ) 067 return makeAnnotated( graph ); 068 069 Transformed child = graphTransformer.transform( transformed.getPlannerContext(), graph ); 070 071 transformed.addChildTransform( child ); 072 073 ElementGraph endGraph = child.getEndGraph(); 074 075 return makeAnnotated( endGraph ); 076 } 077 078 private ElementGraph makeAnnotated( ElementGraph endGraph ) 079 { 080 if( endGraph == null ) 081 return null; 082 083 if( endGraph instanceof AnnotatedGraph ) 084 return endGraph; 085 086 return new ElementMultiGraph( endGraph ); 087 } 088 089 @Override 090 protected Set<FlowElement> addExclusions( ElementGraph graph ) 091 { 092 return ( (AnnotatedGraph) graph ).getAnnotations().getValues( annotation.getAnnotation() ); 093 } 094 095 @Override 096 protected boolean transformGraphInPlaceUsing( Transformed<ElementGraph> transformed, ElementGraph graph, Match match ) 097 { 098 Set<FlowElement> captured = match.getCapturedElements( annotation.getCapture() ); 099 100 if( captured.isEmpty() ) 101 return false; 102 103 ( (AnnotatedGraph) graph ).getAnnotations().addAll( annotation.getAnnotation(), captured ); 104 105 return true; 106 } 107 108 }