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      1 /*
      2 Copyright (c) 2011 Stanislav Vitvitskiy
      3 
      4 Permission is hereby granted, free of charge, to any person obtaining a copy of this
      5 software and associated documentation files (the "Software"), to deal in the Software
      6 without restriction, including without limitation the rights to use, copy, modify,
      7 merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
      8 permit persons to whom the Software is furnished to do so, subject to the following
      9 conditions:
     10 
     11 The above copyright notice and this permission notice shall be included in all copies or
     12 substantial portions of the Software.
     13 
     14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
     15 INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
     16 PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
     17 FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     18 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
     19 OR OTHER DEALINGS IN THE SOFTWARE.
     20 */
     21 package com.googlecode.mp4parser.h264;
     22 
     23 
     24 /**
     25  * Simple BTree implementation needed for haffman tables
     26  *
     27  * @author Stanislav Vitvitskiy
     28  */
     29 public class BTree {
     30     private BTree zero;
     31     private BTree one;
     32     private Object value;
     33 
     34     /**
     35      * Adds a leaf value to a binary path specified by path
     36      *
     37      * @param str
     38      * @param value
     39      */
     40     public void addString(String path, Object value) {
     41         if (path.length() == 0) {
     42             this.value = value;
     43             return;
     44         }
     45         char charAt = path.charAt(0);
     46         BTree branch;
     47         if (charAt == '0') {
     48             if (zero == null)
     49                 zero = new BTree();
     50             branch = zero;
     51         } else {
     52             if (one == null)
     53                 one = new BTree();
     54             branch = one;
     55         }
     56         branch.addString(path.substring(1), value);
     57     }
     58 
     59     public BTree down(int b) {
     60         if (b == 0)
     61             return zero;
     62         else
     63             return one;
     64     }
     65 
     66     public Object getValue() {
     67         return value;
     68     }
     69 }