cosarraylist.java

非常有用的操作pdf文件的java源码

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 * Copyright (c) 2003-2006, www.pdfbox.org
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 *    this list of conditions and the following disclaimer.
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package org.pdfbox.pdmodel.common;

import org.pdfbox.cos.COSArray;
import org.pdfbox.cos.COSBase;
import org.pdfbox.cos.COSDictionary;
import org.pdfbox.cos.COSInteger;
import org.pdfbox.cos.COSFloat;
import org.pdfbox.cos.COSString;
import org.pdfbox.cos.COSName;
import org.pdfbox.cos.COSNull;
import org.pdfbox.cos.COSNumber;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

/**
 * This is an implementation of a List that will sync its contents to a COSArray.
 *
 * @author <a href="mailto:[e-mail]">Ben Litchfield</a>
 * @version $Revision: 1.15 $
 */
public class COSArrayList implements List
{
    private COSArray array;
    private List actual;
    
    private COSDictionary parentDict;
    private String dictKey;
    
    /**
     * Default constructor.
     */
    public COSArrayList()
    {
        array = new COSArray();
        actual = new ArrayList();
    }

    /**
     * Constructor.
     *
     * @param actualList The list of standard java objects
     * @param cosArray The COS array object to sync to.
     */
    public COSArrayList( List actualList, COSArray cosArray )
    {
        actual = actualList;
        array = cosArray;
    }
    
    /**
     * This is a really special constructor.  Sometimes the PDF spec says 
     * that a dictionary entry can either be a single item or an array of those
     * items.  But in the PDModel interface we really just want to always return
     * a java.util.List.  In the case were we get the list and never modify it
     * we don't want to convert to COSArray and put one element, unless we append
     * to the list.  So here we are going to create this object with a single
     * item instead of a list, but allow more items to be added and then converted
     * to an array.
     *
     * @param actualObject The PDModel object.
     * @param item The COS Model object.
     * @param dictionary The dictionary that holds the item, and will hold the array if an item is added.
     * @param dictionaryKey The key into the dictionary to set the item.
     */
    public COSArrayList( Object actualObject, COSBase item, COSDictionary dictionary, String dictionaryKey )
    {
        array = new COSArray();
        array.add( item );
        actual = new ArrayList();
        actual.add( actualObject );
        
        parentDict = dictionary;
        dictKey = dictionaryKey;
    }

    /**
     * {@inheritDoc}
     */
    public int size()
    {
        return actual.size();
    }

    /**
     * {@inheritDoc}
     */
    public boolean isEmpty()
    {
        return actual.isEmpty();
    }

    /**
     * {@inheritDoc}
     */
    public boolean contains(Object o)
    {
        return actual.contains(o);
    }

    /**
     * {@inheritDoc}
     */
    public Iterator iterator()
    {
        return actual.iterator();
    }

    /**
     * {@inheritDoc}
     */
    public Object[] toArray()
    {
        return actual.toArray();
    }

    /**
     * {@inheritDoc}
     */
    public Object[] toArray(Object[] a)
    {
        return actual.toArray(a);

    }

    /**
     * {@inheritDoc}
     */
    public boolean add(Object o)
    {
        //when adding if there is a parentDict then change the item 
        //in the dictionary from a single item to an array.
        if( parentDict != null )
        {
            parentDict.setItem( dictKey, array );
            //clear the parent dict so it doesn't happen again, there might be
            //a usecase for keeping the parentDict around but not now.
            parentDict = null;
        }
        //string is a special case because we can't subclass to be COSObjectable
        if( o instanceof String )
        {
            array.add( new COSString( (String)o ) );
        }
        else if( o instanceof DualCOSObjectable )
        {
            DualCOSObjectable dual = (DualCOSObjectable)o;
            array.add( dual.getFirstCOSObject() );
            array.add( dual.getSecondCOSObject() );
        }
        else
        {
            array.add( ((COSObjectable)o).getCOSObject() );
        }
        return actual.add(o);
    }

    /**
     * {@inheritDoc}
     */
    public boolean remove(Object o)
    {
        boolean retval = true;
        int index = actual.indexOf( o );
        if( index >= 0 )
        {
            actual.remove( index );
            array.remove( index );
        }
        else
        {
            retval = false;
        }
        return retval;
    }

    /**
     * {@inheritDoc}
     */
    public boolean containsAll(Collection c)
    {
        return actual.containsAll( c );
    }

    /**
     * {@inheritDoc}
     */
    public boolean addAll(Collection c)
    {
        //when adding if there is a parentDict then change the item 
        //in the dictionary from a single item to an array.
        if( parentDict != null && c.size() > 0)
        {
            parentDict.setItem( dictKey, array );
            //clear the parent dict so it doesn't happen again, there might be
            //a usecase for keeping the parentDict around but not now.
            parentDict = null;
        }
        array.addAll( toCOSObjectList( c ) );
        return actual.addAll( c );
    }

    /**
     * {@inheritDoc}
     */
    public boolean addAll(int index, Collection c)
    {
        //when adding if there is a parentDict then change the item 
        //in the dictionary from a single item to an array.
        if( parentDict != null && c.size() > 0)
        {
            parentDict.setItem( dictKey, array );
            //clear the parent dict so it doesn't happen again, there might be
            //a usecase for keeping the parentDict around but not now.
            parentDict = null;
        }
        
        if( c.size() >0 && c.toArray()[0] instanceof DualCOSObjectable )
        {
            array.addAll( index*2, toCOSObjectList( c ) );
        }
        else
        {
            array.addAll( index, toCOSObjectList( c ) );
        }
        return actual.addAll( index, c );
    }

    /**
     * This will take an array of COSNumbers and return a COSArrayList of
     * java.lang.Integer values.
     *
     * @param intArray The existing integer Array.
     *
     * @return A list that is part of the core Java collections.
     */
    public static List convertIntegerCOSArrayToList( COSArray intArray )
    {
        List numbers = new ArrayList();
        for( int i=0; i<intArray.size(); i++ )
        {
            numbers.add( new Integer( ((COSNumber)intArray.get( i )).intValue() ) );
        }
        return new COSArrayList( numbers, intArray );
    }

    /**
     * This will take an array of COSNumbers and return a COSArrayList of
     * java.lang.Float values.
     *
     * @param floatArray The existing float Array.
     *
     * @return The list of Float objects.
     */
    public static List convertFloatCOSArrayToList( COSArray floatArray )
    {
        List retval = null;
        if( floatArray != null )
        {
            List numbers = new ArrayList();
            for( int i=0; i<floatArray.size(); i++ )
            {
                numbers.add( new Float( ((COSNumber)floatArray.get( i )).floatValue() ) );
            }
            retval = new COSArrayList( numbers, floatArray );
        }
        return retval;
    }

    /**
     * This will take an array of COSName and return a COSArrayList of
     * java.lang.String values.
     *
     * @param nameArray The existing name Array.
     *
     * @return The list of String objects.
     */
    public static List convertCOSNameCOSArrayToList( COSArray nameArray )
    {
        List retval = null;
        if( nameArray != null )
        {
            List names = new ArrayList();
            for( int i=0; i<nameArray.size(); i++ )
            {
                names.add( ((COSName)nameArray.getObject( i )).getName() );
            }
            retval = new COSArrayList( names, nameArray );
        }
        return retval;
    }

    /**
     * This will take an array of COSString and return a COSArrayList of
     * java.lang.String values.
     *
     * @param stringArray The existing name Array.