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.process; 022 023import java.util.Set; 024 025import cascading.flow.FlowElement; 026import cascading.flow.planner.graph.ElementGraph; 027import cascading.flow.planner.graph.ElementGraphs; 028import cascading.util.Util; 029 030/** 031 * 032 */ 033public class ProcessModels 034 { 035 /** 036 * Does the given process perform any work? 037 * 038 * @param process 039 * @param excludingType 040 * @return 041 */ 042 public static boolean isIdentity( ProcessModel process, Class<? extends FlowElement> excludingType ) 043 { 044 ElementGraph elementGraph = ElementGraphs.asExtentMaskedSubGraph( process.getElementGraph() ); 045 046 Set<? extends FlowElement> sourceElements = Util.narrowIdentitySet( excludingType, process.getSourceElements(), false ); 047 Set<? extends FlowElement> sinkElements = Util.narrowIdentitySet( excludingType, process.getSinkElements(), false ); 048 049 return elementGraph.vertexSet().size() == ( sourceElements.size() + sinkElements.size() ); 050 } 051 052 /** 053 * Does the given process perform any work? 054 * 055 * @param process 056 * @return 057 */ 058 public static boolean isIdentity( ProcessModel process ) 059 { 060 ElementGraph elementGraph = ElementGraphs.asExtentMaskedSubGraph( process.getElementGraph() ); 061 062 Set<FlowElement> sourceElements = process.getSourceElements(); 063 Set<FlowElement> sinkElements = process.getSinkElements(); 064 065 return elementGraph.vertexSet().size() == ( sourceElements.size() + sinkElements.size() ); 066 } 067 }