pddocumentnamedictionary.java

非常有用的操作pdf文件的java源码

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 * Copyright (c) 2005, www.pdfbox.org
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 * modification, are permitted provided that the following conditions are met:
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 *    this list of conditions and the following disclaimer.
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 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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package org.pdfbox.pdmodel;

import org.pdfbox.cos.COSBase;
import org.pdfbox.cos.COSDictionary;
import org.pdfbox.pdmodel.common.COSObjectable;

/**
 * This class holds all of the name trees that are available at the document level.
 *
 * @author <a href="mailto:[e-mail]">Ben Litchfield</a>
 * @version $Revision: 1.3 $
 */
public class PDDocumentNameDictionary implements COSObjectable
{
    private COSDictionary nameDictionary;
    private PDDocumentCatalog catalog;

    /**
     * Constructor.
     * 
     * @param cat The document catalog that this dictionary is part of.
     */
    public PDDocumentNameDictionary( PDDocumentCatalog cat )
    {
        nameDictionary = new COSDictionary();
        catalog = cat;
    }
 
    /**
     * Constructor.
     * 
     * @param cat The document that this dictionary is part of.
     * @param names The names dictionary.
     */
    public PDDocumentNameDictionary( PDDocumentCatalog cat, COSDictionary names )
    {
        catalog = cat;
        nameDictionary = names;
    }
    
    /**
     * Convert this standard java object to a COS object.
     *
     * @return The cos object that matches this Java object.
     */
    public COSBase getCOSObject()
    {
        return nameDictionary;
    }
    
    /**
     * Convert this standard java object to a COS object.
     *
     * @return The cos dictionary for this object.
     */
    public COSDictionary getCOSDictionary()
    {
        return nameDictionary;
    }
    
    /**
     * Get the destination named tree node.  The value in this name tree will be PDDestination
     * objects.
     * 
     * @return The destination name tree node.
     */
    public PDDestinationNameTreeNode getDests()
    {
        PDDestinationNameTreeNode dests = null;
        
        COSDictionary dic = (COSDictionary)nameDictionary.getDictionaryObject( "Dests" );
        
        //The document catalog also contains the Dests entry sometimes
        //so check there as well.
        if( dic == null )
        {
            dic = (COSDictionary)catalog.getCOSDictionary().getDictionaryObject( "Dests" );
        }
        
        if( dic != null )
        {
            dests = new PDDestinationNameTreeNode( dic );
        }
        
        
        return dests;
    }
    
    /**
     * Set the named destinations that are associated with this document.
     * 
     * @param dests The destination names.
     */
    public void setDests( PDDestinationNameTreeNode dests )
    {
        nameDictionary.setItem( "Dests", dests );
        //The dests can either be in the document catalog or in the
        //names dictionary, PDFBox will just maintain the one in the 
        //names dictionary for now unless there is a reason to do 
        //something else.
        //clear the potentially out of date Dests reference.
        catalog.getCOSDictionary().setItem( "Dests", (COSObjectable)null);
    }
    
    /**
     * Get the embedded files named tree node.  The value in this name tree will be PDComplexFileSpecification
     * objects.
     * 
     * @return The embedded files name tree node.
     */
    public PDEmbeddedFilesNameTreeNode getEmbeddedFiles()
    {
        PDEmbeddedFilesNameTreeNode retval = null;
        
        COSDictionary dic = (COSDictionary)nameDictionary.getDictionaryObject( "EmbeddedFiles" );
        
        if( dic != null )
        {
            retval = new PDEmbeddedFilesNameTreeNode( dic );
        }
        
        return retval;
    }
    
    /**
     * Set the named embedded files that are associated with this document.
     * 
     * @param ef The new embedded files
     */
    public void setEmbeddedFiles( PDEmbeddedFilesNameTreeNode ef )
    {
        nameDictionary.setItem( "EmbeddedFiles", ef );
    }
}