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Java > Open Source Codes > org > pdfbox > filter > LZWNode


1 /**
2  * Copyright (c) 2003, www.pdfbox.org
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright notice,
9  * this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
12  * and/or other materials provided with the distribution.
13  * 3. Neither the name of pdfbox; nor the names of its
14  * contributors may be used to endorse or promote products derived from this
15  * software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20  * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
24  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  * http://www.pdfbox.org
29  *
30  */
31 package org.pdfbox.filter;
32
33 import java.util.HashMap JavaDoc;
34 import java.util.Map JavaDoc;
35
36 /**
37  * This is the used for the LZWDecode filter.
38  *
39  * @author <a HREF="mailto:ben@benlitchfield.com">Ben Litchfield</a>
40  * @version $Revision: 1.4 $
41  */
42 class LZWNode
43 {
44     private long code;
45     private Map JavaDoc subNodes = new HashMap JavaDoc();
46
47     /**
48      * This will get the number of children.
49      *
50      * @return The number of children.
51      */
52     public int childCount()
53     {
54         return subNodes.size();
55     }
56
57     /**
58      * This will set the node for a particular byte.
59      *
60      * @param b The byte for that node.
61      * @param node The node to add.
62      */
63     public void setNode( byte b, LZWNode node )
64     {
65         subNodes.put( new Byte JavaDoc( b ), node );
66     }
67
68     /**
69      * This will get the node that is a direct sub node of this node.
70      *
71      * @param data The byte code to the node.
72      *
73      * @return The node at that value if it exists.
74      */
75     public LZWNode getNode( byte data )
76     {
77         return (LZWNode)subNodes.get( new Byte JavaDoc( data ) );
78     }
79
80
81     /**
82      * This will traverse the tree until it gets to the sub node.
83      * This will return null if the node does not exist.
84      *
85      * @param data The path to the node.
86      *
87      * @return The node that resides at the data path.
88      */
89     public LZWNode getNode( byte[] data )
90     {
91         LZWNode current = this;
92         for( int i=0; i<data.length && current != null; i++ )
93         {
94             current = current.getNode( data[i] );
95         }
96         return current;
97     }
98
99     /** Getter for property code.
100      * @return Value of property code.
101      */
102     public long getCode()
103     {
104         return code;
105     }
106
107     /** Setter for property code.
108      * @param codeValue New value of property code.
109      */
110     public void setCode(long codeValue)
111     {
112         code = codeValue;
113     }
114
115 }
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