SVGIDGenerator


1   /*
2   
3      Copyright 2001-2003  The Apache Software Foundation 
4   
5      Licensed under the Apache License, Version 2.0 (the "License");
6      you may not use this file except in compliance with the License.
7      You may obtain a copy of the License at
8   
9          http://www.apache.org/licenses/LICENSE-2.0
10  
11     Unless required by applicable law or agreed to in writing, software
12     distributed under the License is distributed on an "AS IS" BASIS,
13     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14     See the License for the specific language governing permissions and
15     limitations under the License.
16  
17   */
18  package org.apache.batik.svggen;
19  
20  import java.util.HashMap  ;
21  import java.util.Map  ;
22  
23  /**
24   * Generates id for an arbitrary number of prefix
25   *
26   * @author <a HREF="mailto:cjolif@ilog.fr">Christophe Jolif</a>
27   * @author <a HREF="mailto:vincent.hardy@eng.sun.com">Vincent Hardy</a>
28   * @version $Id: SVGIDGenerator.java,v 1.7 2004/08/18 07:15:08 vhardy Exp $
29   */
30  public class SVGIDGenerator {
31      private Map   prefixMap = new HashMap  ();
32  
33      public SVGIDGenerator() {
34      }
35  
36      /**
37       * Generates an id for the given prefix. This class keeps
38       * track of all invocations to that it generates unique ids
39       *
40       * @param prefix defines the prefix for which the id should
41       *               be generated.
42       * @return a value of the form <prefix><n>
43       */
44      public String   generateID(String   prefix) {
45          Integer   maxId = (Integer  )prefixMap.get(prefix);
46          if (maxId == null) {
47              maxId = new Integer  (0);
48              prefixMap.put(prefix, maxId);
49          }
50  
51          maxId = new Integer  (maxId.intValue()+1);
52          prefixMap.put(prefix, maxId);
53          return prefix + maxId;
54      }
55  }
56
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