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      1 /*
      2 The MIT License
      3 
      4 Copyright (c) 2008 Tahseen Ur Rehman
      5 
      6 Permission is hereby granted, free of charge, to any person obtaining a copy
      7 of this software and associated documentation files (the "Software"), to deal
      8 in the Software without restriction, including without limitation the rights
      9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     10 copies of the Software, and to permit persons to whom the Software is
     11 furnished to do so, subject to the following conditions:
     12 
     13 The above copyright notice and this permission notice shall be included in
     14 all copies or substantial portions of the Software.
     15 
     16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     19 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     22 THE SOFTWARE.
     23 */
     24 
     25 package ds.tree;
     26 
     27 import java.util.ArrayList;
     28 import java.util.List;
     29 
     30 /**
     31  * Represents a node of a Radix tree {@link RadixTreeImpl}
     32  *
     33  * @author Tahseen Ur Rehman
     34  * @email tahseen.ur.rehman {at.spam.me.not} gmail.com
     35  * @param <T>
     36  */
     37 class RadixTreeNode<T> {
     38     private String key;
     39 
     40     private List<RadixTreeNode<T>> childern;
     41 
     42     private boolean real;
     43 
     44     private T value;
     45 
     46     /**
     47      * intailize the fields with default values to avoid null reference checks
     48      * all over the places
     49      */
     50     public RadixTreeNode() {
     51         key = "";
     52         childern = new ArrayList<RadixTreeNode<T>>();
     53         real = false;
     54     }
     55 
     56     public T getValue() {
     57         return value;
     58     }
     59 
     60     public void setValue(T data) {
     61         this.value = data;
     62     }
     63 
     64     public String getKey() {
     65         return key;
     66     }
     67 
     68     public void setKey(String value) {
     69         this.key = value;
     70     }
     71 
     72     public boolean isReal() {
     73         return real;
     74     }
     75 
     76     public void setReal(boolean datanode) {
     77         this.real = datanode;
     78     }
     79 
     80     public List<RadixTreeNode<T>> getChildern() {
     81         return childern;
     82     }
     83 
     84     public void setChildern(List<RadixTreeNode<T>> childern) {
     85         this.childern = childern;
     86     }
     87 
     88     public int getNumberOfMatchingCharacters(String key) {
     89         int numberOfMatchingCharacters = 0;
     90         while (numberOfMatchingCharacters < key.length() && numberOfMatchingCharacters < this.getKey().length()) {
     91             if (key.charAt(numberOfMatchingCharacters) != this.getKey().charAt(numberOfMatchingCharacters)) {
     92                 break;
     93             }
     94             numberOfMatchingCharacters++;
     95         }
     96         return numberOfMatchingCharacters;
     97     }
     98 
     99     @Override
    100     public String toString() {
    101         return key;
    102     }
    103 }
    104