Clover coverage report - Code Coverage for tapestry release 3.1-alpha-1
Coverage timestamp: Mon Feb 21 2005 09:16:14 EST
file stats: LOC: 86   Methods: 4
NCLOC: 39   Classes: 2
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 Source file Conditionals Statements Methods TOTAL
IdAllocator.java 100% 100% 100% 100%
coverage
 1   
 // Copyright 2004, 2005 The Apache Software Foundation
 2   
 //
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 // Licensed under the Apache License, Version 2.0 (the "License");
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 // you may not use this file except in compliance with the License.
 5   
 // You may obtain a copy of the License at
 6   
 //
 7   
 //     http://www.apache.org/licenses/LICENSE-2.0
 8   
 //
 9   
 // Unless required by applicable law or agreed to in writing, software
 10   
 // distributed under the License is distributed on an "AS IS" BASIS,
 11   
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 12   
 // See the License for the specific language governing permissions and
 13   
 // limitations under the License.
 14   
 
 15   
 package org.apache.tapestry.util;
 16   
 
 17   
 import java.util.HashMap;
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 import java.util.Map;
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 20   
 /**
 21   
  * Used to "uniquify" names within a given context. A base name is passed in, and the return value
 22   
  * is the base name, or the base name extended with a suffix to make it unique.
 23   
  * 
 24   
  * @author Howard Lewis Ship
 25   
  * @since 3.0
 26   
  */
 27   
 
 28   
 public class IdAllocator
 29   
 {
 30   
     private Map _generatorMap = new HashMap();
 31   
 
 32   
     private static class NameGenerator
 33   
     {
 34   
         private String _baseId;
 35   
 
 36   
         private int _index;
 37   
 
 38  1039
         NameGenerator(String baseId)
 39   
         {
 40  1039
             _baseId = baseId + "$";
 41   
         }
 42   
 
 43  112
         public String nextId()
 44   
         {
 45  112
             return _baseId + _index++;
 46   
         }
 47   
     }
 48   
 
 49   
     /**
 50   
      * Allocates the id. Repeated calls for the same name will return "name", "name$0", "name$1",
 51   
      * etc.
 52   
      */
 53   
 
 54  1150
     public String allocateId(String name)
 55   
     {
 56  1150
         NameGenerator g = (NameGenerator) _generatorMap.get(name);
 57  1150
         String result = null;
 58   
 
 59  1150
         if (g == null)
 60   
         {
 61  1039
             g = new NameGenerator(name);
 62  1039
             result = name;
 63   
         }
 64   
         else
 65  111
             result = g.nextId();
 66   
 
 67   
         // Handle the degenerate case, where a base name of the form "foo$0" has been
 68   
         // requested. Skip over any duplicates thus formed.
 69   
 
 70  1150
         while (_generatorMap.containsKey(result))
 71  1
             result = g.nextId();
 72   
 
 73  1150
         _generatorMap.put(result, g);
 74   
 
 75  1150
         return result;
 76   
     }
 77   
 
 78   
     /**
 79   
      * Clears the allocator, resetting it to freshly allocated state.
 80   
      */
 81   
 
 82  337
     public void clear()
 83   
     {
 84  337
         _generatorMap.clear();
 85   
     }
 86   
 }