1 /*
   2  * Copyright (c) 1996, 2003, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.corba.se.impl.naming.cosnaming;
  27 
  28 import org.omg.CosNaming.NameComponent;
  29 
  30 /**
  31  * Class InternalBindingKey implements the necessary wrapper code
  32  * around the org.omg.CosNaming::NameComponent class to implement the proper
  33  * equals() method and the hashCode() method for use in a hash table.
  34  * It computes the hashCode once and stores it, and also precomputes
  35  * the lengths of the id and kind strings for faster comparison.
  36  */
  37 public class InternalBindingKey
  38 {
  39     // A key contains a name
  40     public NameComponent name;
  41     private int idLen;
  42     private int kindLen;
  43     private int hashVal;
  44 
  45     // Default Constructor
  46     public InternalBindingKey() {}
  47 
  48     // Normal constructor
  49     public InternalBindingKey(NameComponent n)
  50     {
  51         idLen = 0;
  52         kindLen = 0;
  53         setup(n);
  54     }
  55 
  56     // Setup the object
  57     protected void setup(NameComponent n) {
  58         this.name = n;
  59         // Precompute lengths and values since they will not change
  60         if( this.name.id != null ) {
  61             idLen = this.name.id.length();
  62         }
  63         if( this.name.kind != null ) {
  64             kindLen = this.name.kind.length();
  65         }
  66         hashVal = 0;
  67         if (idLen > 0)
  68             hashVal += this.name.id.hashCode();
  69         if (kindLen > 0)
  70             hashVal += this.name.kind.hashCode();
  71     }
  72 
  73     // Compare the keys by comparing name's id and kind
  74     public boolean equals(java.lang.Object o) {
  75         if (o == null)
  76             return false;
  77         if (o instanceof InternalBindingKey) {
  78             InternalBindingKey that = (InternalBindingKey)o;
  79             // Both lengths must match
  80             if (this.idLen != that.idLen || this.kindLen != that.kindLen) {
  81                 return false;
  82             }
  83             // If id is set is must be equal
  84             if (this.idLen > 0 && this.name.id.equals(that.name.id) == false) {
  85                 return false;
  86             }
  87             // If kind is set it must be equal
  88             if (this.kindLen > 0 && this.name.kind.equals(that.name.kind) == false) {
  89                 return false;
  90             }
  91             // Must be the same
  92             return true;
  93         } else {
  94             return false;
  95         }
  96     }
  97     // Return precomputed value
  98     public int hashCode() {
  99         return this.hashVal;
 100     }
 101 }