001/* 002 * Copyright (c) 2007-2016 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 */ 020 021/* 022 * See package LICENSE.txt for additional license information. 023 */ 024 025package cascading.util.jgrapht; 026 027import java.util.HashMap; 028import java.util.Map; 029 030public class IntegerNameProvider<V> implements VertexNameProvider<V> 031 { 032 private int nextID = 1; 033 private final Map<V, Integer> idMap = new HashMap<>(); 034 035 public void clear() 036 { 037 nextID = 1; 038 idMap.clear(); 039 } 040 041 @Override 042 public String getVertexName( V vertex ) 043 { 044 Integer id = idMap.get( vertex ); 045 046 if( id == null ) 047 { 048 id = nextID++; 049 idMap.put( vertex, id ); 050 } 051 052 return id.toString(); 053 } 054 }