pdannotation.java

非常有用的操作pdf文件的java源码

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 * Copyright (c) 2003-2005, www.pdfbox.org
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 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package org.pdfbox.pdmodel.interactive.annotation;

import java.io.IOException;

import org.pdfbox.cos.COSArray;
import org.pdfbox.cos.COSDictionary;
import org.pdfbox.cos.COSName;

import org.pdfbox.pdmodel.common.COSObjectable;
import org.pdfbox.pdmodel.common.PDRectangle;
import org.pdfbox.pdmodel.graphics.color.PDGamma;
import org.pdfbox.pdmodel.interactive.action.PDActionFactory;
import org.pdfbox.pdmodel.interactive.action.PDAdditionalActions;
import org.pdfbox.pdmodel.interactive.action.type.PDAction;
import org.pdfbox.util.BitFlagHelper;
import org.pdfbox.cos.COSBase;

/**
 * This class represents a PDF annotation.
 *
 * @author <a href="mailto:[e-mail]">Ben Litchfield</a>
 * @version $Revision: 1.14 $
 */
public abstract class PDAnnotation implements COSObjectable
{
    /**
     * An annotation flag.
     */
    public static final int FLAG_INVISIBLE = 1 << 0;
    /**
     * An annotation flag.
     */
    public static final int FLAG_HIDDEN = 1 << 1;
    /**
     * An annotation flag.
     */
    public static final int FLAG_PRINTED = 1 << 2;
    /**
     * An annotation flag.
     */
    public static final int FLAG_NO_ZOOM = 1 << 3;
    /**
     * An annotation flag.
     */
    public static final int FLAG_NO_ROTATE = 1 << 4;
    /**
     * An annotation flag.
     */
    public static final int FLAG_NO_VIEW = 1 << 5;
    /**
     * An annotation flag.
     */
    public static final int FLAG_READ_ONLY = 1 << 6;
    /**
     * An annotation flag.
     */
    public static final int FLAG_LOCKED = 1 << 7;
    /**
     * An annotation flag.
     */
    public static final int FLAG_TOGGLE_NO_VIEW = 1 << 8;
    
    
    
    private COSDictionary dictionary;
    
    /**
     * Create the correct annotation from the base COS object.
     * 
     * @param base The COS object that is the annotation.
     * @return The correctly typed annotation object.
     * @throws IOException If there is an error while creating the annotation.
     */
    public static PDAnnotation createAnnotation( COSBase base ) throws IOException
    {
        PDAnnotation annot = null;
        if( base instanceof COSDictionary )
        {
            COSDictionary annotDic = (COSDictionary)base;
            String subtype = annotDic.getNameAsString( COSName.SUBTYPE );
            if( subtype.equals( PDAnnotationRubberStamp.SUB_TYPE ) )
            {
                annot = new PDAnnotationRubberStamp(annotDic);
            }
            else if( subtype.equals( PDAnnotationLink.SUB_TYPE ) )
            {
                annot = new PDAnnotationLink(annotDic);
            }
            else if( subtype.equals( PDAnnotationText.SUB_TYPE ) )
            {
                annot = new PDAnnotationText( annotDic);
            }
            else if( subtype.equals( PDAnnotationLine.SUB_TYPE ) )
            {
                annot = new PDAnnotationLine( annotDic );
            }
            else if( subtype.equals( PDAnnotationSquareCircle.SUB_TYPE_SQUARE ) || 
                     subtype.equals( PDAnnotationSquareCircle.SUB_TYPE_CIRCLE ) )
            {
                annot = new PDAnnotationSquareCircle( annotDic );
            }
            else if( subtype.equals( PDAnnotationLink.SUB_TYPE ) )
            {
                annot = new PDAnnotationLink( annotDic );
            }
            else if( subtype.equals( PDAnnotationFileAttachment.SUB_TYPE ) )
            {
                annot = new PDAnnotationFileAttachment( annotDic );
            }
            else if( subtype.equals( PDAnnotationTextMarkup.SUB_TYPE_HIGHLIGHT ) || 
                     subtype.equals( PDAnnotationTextMarkup.SUB_TYPE_UNDERLINE ) || 
                     subtype.equals( PDAnnotationTextMarkup.SUB_TYPE_SQUIGGLY ) || 
                     subtype.equals( PDAnnotationTextMarkup.SUB_TYPE_STRIKEOUT ))
            {
                annot = new PDAnnotationTextMarkup( annotDic );
            }
            else
            {
                annot = new PDAnnotationUnknown( annotDic );
            }
        }
        else
        {
            throw new IOException( "Error: Unknown annotation type " + base );
        }
        
        return annot;
    }

    /** 
     * Constructor.
     */
    public PDAnnotation()
    {
        dictionary = new COSDictionary();
        dictionary.setItem( COSName.TYPE, COSName.getPDFName( "Annot" ) );
    }

    /**
     * Constructor.
     *
     * @param dict The annotations dictionary.
     */
    public PDAnnotation( COSDictionary dict )
    {
        dictionary = dict;
    }

    /**
     * returns the dictionary.
     * @return the dictionary
     */
    public COSDictionary getDictionary()
    {
        return dictionary;
    }

    /**
     * The annotation rectangle, defining the location of the annotation
     * on the page in default user space units.  This is usually required and should
     * not return null on valid PDF documents.  But where this is a parent form field
     * with children, such as radio button collections then the rectangle will be null.
     *
     * @return The Rect value of this annotation.
     */
    public PDRectangle getRectangle()
    {
        COSArray rectArray = (COSArray)dictionary.getDictionaryObject( COSName.getPDFName( "Rect" ) );
        PDRectangle rectangle = null;
        if( rectArray != null )
        {
            rectangle = new PDRectangle( rectArray );
        }
        return rectangle;
    }

    /**
     * This will set the rectangle for this annotation.
     *
     * @param rectangle The new rectangle values.
     */
    public void setRectangle( PDRectangle rectangle )
    {
        dictionary.setItem( COSName.getPDFName( "Rect" ), rectangle.getCOSArray() );
    }

   /**
     * This will get the flags for this field.
     *
     * @return flags The set of flags.
     */
    public int getAnnotationFlags()
    {
        return getDictionary().getInt( "F", 0 );
    }

    /**
     * This will set the flags for this field.
     *
     * @param flags The new flags.
     */
    public void setAnnotationFlags( int flags )
    {
        getDictionary().setInt( "F", flags );
    }

    /**
     * Interface method for COSObjectable.
     *
     * @return This object as a standard COS object.
     */
    public COSBase getCOSObject()
    {
        return getDictionary();
    }

    /**
     * This will get the name of the current appearance stream if any.
     *
     * @return The name of the appearance stream.
     */
    public String getAppearanceStream()
    {
        String retval = null;
        COSName name = (COSName)getDictionary().getDictionaryObject( COSName.getPDFName( "AS" ) );
        if( name != null )
        {
            retval = name.getName();
        }
        return retval;
    }

    /**
     * This will set the annotations appearance stream name.
     *
     * @param as The name of the appearance stream.
     */
    public void setAppearanceStream( String as )
    {
        if( as == null )
        {
            getDictionary().removeItem( COSName.getPDFName( "AS" ) );
        }
        else
        {
            getDictionary().setItem( COSName.getPDFName( "AS" ), COSName.getPDFName( as ) );
        }
    }

    /**
     * This will get the appearance dictionary associated with this annotation.
     * This may return null.
     *
     * @return This annotations appearance.
     */
    public PDAppearanceDictionary getAppearance()
    {
        PDAppearanceDictionary ap = null;
        COSDictionary apDic = (COSDictionary)dictionary.getDictionaryObject( COSName.getPDFName( "AP" ) );
        if( apDic != null )
        {
            ap = new PDAppearanceDictionary( apDic );
        }
        return ap;
    }

    /**
     * This will set the appearance associated with this annotation.
     *
     * @param appearance The appearance dictionary for this annotation.
     */
    public void setAppearance( PDAppearanceDictionary appearance )
    {
        COSDictionary ap = null;
        if( appearance != null )
        {
            ap = appearance.getDictionary();
        }
        dictionary.setItem( COSName.getPDFName( "AP" ), ap );
    }
    
    /**
     * Get the invisible flag.
     * 
     * @return The invisible flag.
     */
    public boolean isInvisible()
    {
        return BitFlagHelper.getFlag( getDictionary(), "F", FLAG_INVISIBLE );
    }
    
    /**
     * Set the invisible flag.
     * 
     * @param invisible The new invisible flag.
     */
    public void setInvisible( boolean invisible )
    {
        BitFlagHelper.setFlag( getDictionary(), "F", FLAG_INVISIBLE, invisible );
    }
    
    /**
     * Get the hidden flag.
     * 
     * @return The hidden flag.
     */
    public boolean isHidden()
    {
        return BitFlagHelper.getFlag( getDictionary(), "F", FLAG_HIDDEN );
    }