Clover coverage report - Code Coverage for tapestry release 4.0-beta-2
Coverage timestamp: Sat Jul 9 2005 22:02:17 EDT
file stats: LOC: 104   Methods: 6
NCLOC: 51   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    //
 3    // Licensed under the Apache License, Version 2.0 (the "License");
 4    // 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;
 18    import java.util.Map;
 19   
 20    import org.apache.hivemind.util.Defense;
 21   
 22    /**
 23    * Used to "uniquify" names within a given context. A base name is passed in, and the return value
 24    * is the base name, or the base name extended with a suffix to make it unique.
 25    *
 26    * @author Howard Lewis Ship
 27    * @since 3.0
 28    */
 29   
 30    public class IdAllocator
 31    {
 32    private final Map _generatorMap = new HashMap();
 33   
 34    private final String _namespace;
 35   
 36    private static class NameGenerator
 37    {
 38    private final String _baseId;
 39   
 40    private int _index;
 41   
 42  2856 NameGenerator(String baseId)
 43    {
 44  2856 _baseId = baseId + "$";
 45    }
 46   
 47  191 public String nextId()
 48    {
 49  191 return _baseId + _index++;
 50    }
 51    }
 52   
 53  957 public IdAllocator()
 54    {
 55  957 this("");
 56    }
 57   
 58  1043 public IdAllocator(String namespace)
 59    {
 60  1043 Defense.notNull(namespace, "namespace");
 61   
 62  1043 _namespace = namespace;
 63    }
 64   
 65    /**
 66    * Allocates the id. Repeated calls for the same name will return "name", "name$0", "name$1",
 67    * etc.
 68    */
 69   
 70  3046 public String allocateId(String name)
 71    {
 72  3046 String key = name + _namespace;
 73   
 74  3046 NameGenerator g = (NameGenerator) _generatorMap.get(key);
 75  3046 String result = null;
 76   
 77  3046 if (g == null)
 78    {
 79  2856 g = new NameGenerator(key);
 80  2856 result = key;
 81    }
 82    else
 83  190 result = g.nextId();
 84   
 85    // Handle the degenerate case, where a base name of the form "foo$0" has been
 86    // requested. Skip over any duplicates thus formed.
 87   
 88  3046 while (_generatorMap.containsKey(result))
 89  1 result = g.nextId();
 90   
 91  3046 _generatorMap.put(result, g);
 92   
 93  3046 return result;
 94    }
 95   
 96    /**
 97    * Clears the allocator, resetting it to freshly allocated state.
 98    */
 99   
 100  356 public void clear()
 101    {
 102  356 _generatorMap.clear();
 103    }
 104    }