/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox.filter;
import java.util.HashMap;
import java.util.Map;
/**
* This is the used for the LZWDecode filter.
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @version $Revision: 1.4 $
*/
class LZWNode
{
private long code;
private Map subNodes = new HashMap();
/**
* This will get the number of children.
*
* @return The number of children.
*/
public int childCount()
{
return subNodes.size();
}
/**
* This will set the node for a particular byte.
*
* @param b The byte for that node.
* @param node The node to add.
*/
public void setNode( byte b, LZWNode node )
{
subNodes.put( new Byte( b ), node );
}
/**
* This will get the node that is a direct sub node of this node.
*
* @param data The byte code to the node.
*
* @return The node at that value if it exists.
*/
public LZWNode getNode( byte data )
{
return (LZWNode)subNodes.get( new Byte( data ) );
}
/**
* This will traverse the tree until it gets to the sub node.
* This will return null if the node does not exist.
*
* @param data The path to the node.
*
* @return The node that resides at the data path.
*/
public LZWNode getNode( byte[] data )
{
LZWNode current = this;
for( int i=0; i<data.length && current != null; i++ )
{
current = current.getNode( data[i] );
}
return current;
}
/** Getter for property code.
* @return Value of property code.
*/
public long getCode()
{
return code;
}
/** Setter for property code.
* @param codeValue New value of property code.
*/
public void setCode(long codeValue)
{
code = codeValue;
}
}