Coverage Report - org.apache.commons.lang3.builder.IDKey
 
Classes in this File Line Coverage Branch Coverage Complexity
IDKey
81%
9/11
50%
3/6
2,333
 
 1  
 /*
 2  
  * Licensed to the Apache Software Foundation (ASF) under one or more
 3  
  * contributor license agreements.  See the NOTICE file distributed with
 4  
  * this work for additional information regarding copyright ownership.
 5  
  * The ASF licenses this file to You under the Apache License, Version 2.0
 6  
  * (the "License"); you may not use this file except in compliance with
 7  
  * the License.  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.commons.lang3.builder;
 19  
 
 20  
 // adapted from org.apache.axis.utils.IDKey
 21  
 
 22  
 /**
 23  
  * Wrap an identity key (System.identityHashCode()) 
 24  
  * so that an object can only be equal() to itself.
 25  
  * 
 26  
  * This is necessary to disambiguate the occasional duplicate
 27  
  * identityHashCodes that can occur.
 28  
  */ 
 29  
 final class IDKey {
 30  
         private final Object value;
 31  
         private final int id;
 32  
 
 33  
         /**
 34  
          * Constructor for IDKey
 35  
          * @param _value The value
 36  
          */ 
 37  2598
         public IDKey(final Object _value) {
 38  
             // This is the Object hashcode 
 39  2598
             id = System.identityHashCode(_value);  
 40  
             // There have been some cases (LANG-459) that return the 
 41  
             // same identity hash code for different objects.  So 
 42  
             // the value is also added to disambiguate these cases.
 43  2598
             value = _value;
 44  2598
         }
 45  
 
 46  
         /**
 47  
          * returns hashcode - i.e. the system identity hashcode.
 48  
          * @return the hashcode
 49  
          */ 
 50  
         @Override
 51  
         public int hashCode() {
 52  1906
            return id;
 53  
         }
 54  
 
 55  
         /**
 56  
          * checks if instances are equal
 57  
          * @param other The other object to compare to
 58  
          * @return if the instances are for the same object
 59  
          */ 
 60  
         @Override
 61  
         public boolean equals(final Object other) {
 62  948
             if (!(other instanceof IDKey)) {
 63  0
                 return false;
 64  
             }
 65  948
             final IDKey idKey = (IDKey) other;
 66  948
             if (id != idKey.id) {
 67  0
                 return false;
 68  
             }
 69  
             // Note that identity equals is used.
 70  948
             return value == idKey.value;
 71  
          }
 72  
 }