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 package org.apache.pdfbox.filter;
18
19 import java.util.HashMap;
20 import java.util.Map;
21
22 /**
23 * This is the used for the LZWDecode filter.
24 *
25 * @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
26 * @version $Revision: 1.4 $
27 */
28 class LZWNode
29 {
30 private long code;
31 private Map subNodes = new HashMap();
32
33 /**
34 * This will get the number of children.
35 *
36 * @return The number of children.
37 */
38 public int childCount()
39 {
40 return subNodes.size();
41 }
42
43 /**
44 * This will set the node for a particular byte.
45 *
46 * @param b The byte for that node.
47 * @param node The node to add.
48 */
49 public void setNode( byte b, LZWNode node )
50 {
51 subNodes.put( new Byte( b ), node );
52 }
53
54 /**
55 * This will get the node that is a direct sub node of this node.
56 *
57 * @param data The byte code to the node.
58 *
59 * @return The node at that value if it exists.
60 */
61 public LZWNode getNode( byte data )
62 {
63 return (LZWNode)subNodes.get( new Byte( data ) );
64 }
65
66
67 /**
68 * This will traverse the tree until it gets to the sub node.
69 * This will return null if the node does not exist.
70 *
71 * @param data The path to the node.
72 *
73 * @return The node that resides at the data path.
74 */
75 public LZWNode getNode( byte[] data )
76 {
77 LZWNode current = this;
78 for( int i=0; i<data.length && current != null; i++ )
79 {
80 current = current.getNode( data[i] );
81 }
82 return current;
83 }
84
85 /** Getter for property code.
86 * @return Value of property code.
87 */
88 public long getCode()
89 {
90 return code;
91 }
92
93 /** Setter for property code.
94 * @param codeValue New value of property code.
95 */
96 public void setCode(long codeValue)
97 {
98 code = codeValue;
99 }
100
101 }