/*
* 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.pdmodel;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSInteger;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSNumber;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdfviewer.PageDrawer;
import org.apache.pdfbox.pdmodel.common.COSArrayList;
import org.apache.pdfbox.pdmodel.common.COSObjectable;
import org.apache.pdfbox.pdmodel.common.PDMetadata;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.common.PDStream;
import org.apache.pdfbox.pdmodel.interactive.action.PDPageAdditionalActions;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotation;
import org.apache.pdfbox.pdmodel.interactive.pagenavigation.PDThreadBead;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.image.ImagingOpException;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterIOException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;
/**
* This represents a single page in a PDF document.
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @version $Revision: 1.29 $
*/
public class PDPage implements COSObjectable, Printable
{
/**
* Log instance.
*/
private static final Log log = LogFactory.getLog(PDPage.class);
private static final int DEFAULT_USER_SPACE_UNIT_DPI = 72;
private COSDictionary page;
/**
* A page size of LETTER or 8.5x11.
*/
public static final PDRectangle PAGE_SIZE_LETTER = new PDRectangle( 612, 792 );
/**
* A page size of A0 Paper.
*/
public static final PDRectangle PAGE_SIZE_A0 = new PDRectangle( 2383, 3370 );
/**
* A page size of A1 Paper.
*/
public static final PDRectangle PAGE_SIZE_A1 = new PDRectangle( 1685, 2383 );
/**
* A page size of A2 Paper.
*/
public static final PDRectangle PAGE_SIZE_A2 = new PDRectangle( 1192, 1685 );
/**
* A page size of A3 Paper.
*/
public static final PDRectangle PAGE_SIZE_A3 = new PDRectangle( 843, 1192 );
/**
* A page size of A4 Paper.
*/
public static final PDRectangle PAGE_SIZE_A4 = new PDRectangle( 596, 843 );
/**
* A page size of A5 Paper.
*/
public static final PDRectangle PAGE_SIZE_A5 = new PDRectangle( 421, 596 );
/**
* A page size of A6 Paper.
*/
public static final PDRectangle PAGE_SIZE_A6 = new PDRectangle( 298, 421 );
/**
* Creates a new instance of PDPage with a size of 8.5x11.
*/
public PDPage()
{
page = new COSDictionary();
page.setItem( COSName.TYPE, COSName.PAGE );
setMediaBox( PAGE_SIZE_LETTER );
}
/**
* Creates a new instance of PDPage.
*
* @param pageDic The existing page dictionary.
*/
public PDPage( COSDictionary pageDic )
{
page = pageDic;
}
/**
* Convert this standard java object to a COS object.
*
* @return The cos object that matches this Java object.
*/
public COSBase getCOSObject()
{
return page;
}
/**
* This will get the underlying dictionary that this class acts on.
*
* @return The underlying dictionary for this class.
*/
public COSDictionary getCOSDictionary()
{
return page;
}
/**
* This is the parent page node. The parent is a required element of the
* page. This will be null until this page is added to the document.
*
* @return The parent to this page.
*/
public PDPageNode getParent()
{
if( parent == null){
COSDictionary parentDic = (COSDictionary)page.getDictionaryObject( "Parent", "P" );
if( parentDic != null )
{
parent = new PDPageNode( parentDic );
}
}
return parent;
}
private PDPageNode parent = null;
/**
* This will set the parent of this page.
*
* @param parent The parent to this page node.
*/
public void setParent( PDPageNode parent )
{
this.parent = parent;
page.setItem( COSName.PARENT, parent.getDictionary() );
}
/**
* This will update the last modified time for the page object.
*/
public void updateLastModified()
{
page.setDate( "LastModified", new GregorianCalendar() );
}
/**
* This will get the date that the content stream was last modified. This
* may return null.
*
* @return The date the content stream was last modified.
*
* @throws IOException If there is an error accessing the date information.
*/
public Calendar getLastModified() throws IOException
{
return page.getDate( "LastModified" );
}
/**
* This will get the resources at this page and not look up the hierarchy.
* This attribute is inheritable, and findResources() should probably used.
* This will return null if no resources are available at this level.
*
* @return The resources at this level in the hierarchy.
*/
public PDResources getResources()
{
PDResources retval = null;
COSDictionary resources = (COSDictionary)page.getDictionaryObject( COSName.RESOURCES );
if( resources != null )
{
retval = new PDResources( resources );
}
return retval;
}
/**
* This will find the resources for this page by looking up the hierarchy until
* it finds them.
*
* @return The resources at this level in the hierarchy.
*/
public PDResources findResources()
{
PDResources retval = getResources();
PDPageNode parent = getParent();
if( retval == null && parent != null )
{
retval = parent.findResources();
}
return retval;
}
/**
* This will set the resources for this page.
*
* @param resources The new resources for this page.
*/
public void setResources( PDResources resources )
{
page.setItem( COSName.RESOURCES, resources );
}
/**
* A rectangle, expressed
* in default user space units, defining the boundaries of the physical
* medium on which the page is intended to be displayed or printed
*
* This will get the MediaBox at this page and not look up the hierarchy.
* This attribute is inheritable, and findMediaBox() should probably used.
* This will return null if no MediaBox are available at this level.
*
* @return The MediaBox at this level in the hierarchy.
*/
public PDRectangle getMediaBox()
{
if( mediaBox == null){
COSArray array = (COSArray)page.getDictionaryObject( COSName.MEDIA_BOX );
if( array != null )
{
mediaBox = new PDRectangle( array );
}
}
return mediaBox;
}
private PDRectangle mediaBox = null;
/**
* This will find the MediaBox for this page by looking up the hierarchy until
* it finds them.
*
* @return The MediaBox at this level in the hierarchy.
*/
public PDRectangle findMediaBox()
{
PDRectangle retval = getMediaBox();
if( retval == null && getParent() != null )
{
retval = getParent().findMediaBox();
}
return retval;
}
/**
* This will set the mediaBox for this page.
*
* @param mediaBox The new mediaBox for this page.
*/
public void setMediaBox( PDRectangle mediaBox )
{
this.mediaBox = mediaBox;
if( mediaBox == null )
{
page.removeItem( COSName.MEDIA_BOX );
}
else
{
page.setItem( COSName.MEDIA_BOX, mediaBox.getCOSArray() );
}
}
/**
* A rectangle, expressed in default user space units,
* defining the visible region of default user space. When the page is displayed
* or printed, its contents are to be clipped (cropped) to this rectangle
* and then imposed on the output medium in some implementationdefined
* manner
*
* This will get the CropBox at this page and not look up the hierarchy.
* This attribute is inheritable, and findCropBox() should probably used.
* This will return null if no CropBox is available at this level.
*
* @return The CropBox at this level in the hierarchy.
*/
public PDRectangle getCropBox()
{
PDRectangle retval = null;
COSArray array = (COSArray)page.getDictionaryObject( COSName.CROP_BOX);
if( array != null )
{
retval = new PDRectangle( array );
}
return retval;
}
/**
* This will find the CropBox for this page by looking up the hierarchy until
* it finds them.
*
* @return The CropBox at this level in the hierarchy.
*/
public PDRectangle findCropBox()
{
PDRectangle retval = getCropBox();
PDPageNode parent = getParent();
if( retval == null && parent != null )
{
retval = findParentCropBox( parent );
}
//default value for cropbox is the media box
if( retval == null )
{
retval = findMediaBox();
}
return retval;
}
/**
* This will search for a crop box in the parent and return null if it is not
* found. It will NOT default to the media box if it cannot be found.
*
* @param node The node
*/
private PDRectangle findParentCropBox( PDPageNode node )
{
PDRectangle rect = node.getCropBox();
PDPageNode parent = node.getParent();
if( rect == null && parent != null )
{
rect = findParentCropBox( parent );
}
return rect;
}
/**
* This will set the CropBox for this page.
*
* @param cropBox The new CropBox for this page.
*/
public void setCropBox( PDRectangle cropBox )
{
if( cropBox == null )
{
page.removeItem( COSName.CROP_BOX );
}
else
{
page.setItem( COSName.CROP_BOX, cropBox.getCOSArray() );
}
}
/**
* A rectangle, expressed in default user space units, defining
* the region to which the contents of the page should be clipped
* when output in a production environment. The default is the CropBox.
*
* @return The BleedBox attribute.
*/
public PDRectangle getBleedBox()
{
PDRectangle retval = null;
COSArray array = (COSArray)page.getDictionaryObject( COSName.BLEED_BOX );
if( array != null )
{
retval = new PDRectangle( array );
}
else
{
retval = findCropBox();
}
return retval;
}
/**
* This will set the BleedBox for this page.
*
* @param bleedBox The new BleedBox for this page.
*/
public void setBleedBox( PDRectangle bleedBox )
{
if( bleedBox == null )
{
page.removeItem( COSName.BLEED_BOX );
}
else
{
page.setItem( COSName.BLEED_BOX, bleedBox.getCOSArray() );
}
}
/**
* A rectangle, expressed in default user space units, defining
* the intended dimensions of the finished page after trimming.
* The default is the CropBox.
*
* @return The TrimBox attribute.
*/
public PDRectangle getTrimBox()
{
PDRectangle retval = null;
COSArray array = (COSArray)page.getDictionaryObject( COSName.TRIM_BOX );
if( array != null )
{
retval = new PDRectangle( array );
}
else
{
retval = findCropBox();
}
return retval;
}
/**
* This will set the TrimBox for this page.
*
* @param trimBox The new TrimBox for this page.
*/
public void setTrimBox( PDRectangle trimBox )
{
if( trimBox == null )
{
page.removeItem( COSName.TRIM_BOX );
}
else
{
page.setItem( COSName.TRIM_BOX, trimBox.getCOSArray() );
}
}
/**
* A rectangle, expressed in default user space units, defining
* the extent of the page's meaningful content (including potential
* white space) as intended by the page's creator The default isthe CropBox.
*
* @return The ArtBox attribute.
*/
public PDRectangle getArtBox()
{
PDRectangle retval = null;
COSArray array = (COSArray)page.getDictionaryObject( COSName.ART_BOX );
if( array != null )
{
retval = new PDRectangle( array );
}
else
{
retval = findCropBox();
}
return retval;
}
/**
* This will set the ArtBox for this page.
*
* @param artBox The new ArtBox for this page.
*/
public void setArtBox( PDRectangle artBox )
{
if( artBox == null )
{
page.removeItem( COSName.ART_BOX );
}
else
{
page.setItem( COSName.ART_BOX, artBox.getCOSArray() );
}
}
//todo BoxColorInfo
//todo Contents
/**
* A value representing the rotation. This will be null if not set at this level
* The number of degrees by which the page should
* be rotated clockwise when displayed or printed. The value must be a multiple
* of 90.
*
* This will get the rotation at this page and not look up the hierarchy.
* This attribute is inheritable, and findRotation() should probably used.
* This will return null if no rotation is available at this level.
*
* @return The rotation at this level in the hierarchy.
*/
public Integer getRotation()
{
Integer retval = null;
COSNumber value = (COSNumber)page.getDictionaryObject( COSName.ROTATE );
if( value != null )
{
retval = new Integer( value.intValue() );
}
return retval;
}
/**
* This will find the rotation for this page by looking up the hierarchy until
* it finds them.
*
* @return The rotation at this level in the hierarchy.
*/
public int findRotation()
{
int retval = 0;
Integer rotation = getRotation();
if( rotation != null )
{
retval = rotation.intValue();
}
else
{
PDPageNode parent = getParent();
if( parent != null )
{
retval = parent.findRotation();
}
}
return retval;
}
/**
* This will set the rotation for this page.
*
* @param rotation The new rotation for this page.
*/
public void setRotation( int rotation )
{
page.setItem( COSName.ROTATE, new COSInteger( rotation ) );
}
/**
* This will get the contents of the PDF Page, in the case that the contents
* of the page is an array then then the entire array of streams will be
* be wrapped and appear as a single stream.
*
* @return The page content stream.
*
* @throws IOException If there is an error obtaining the stream.
*/
public PDStream getContents() throws IOException
{
return PDStream.createFromCOS( page.getDictionaryObject( COSName.CONTENTS ) );
}
/**
* This will set the contents of this page.
*
* @param contents The new contents of the page.
*/
public void setContents( PDStream contents )
{
page.setItem( COSName.CONTENTS, contents );
}
/**
* This will get a list of PDThreadBead objects, which are article threads in the
* document. This will return an empty list of there are no thread beads.
*
* @return A list of article threads on this page.
*/
public List getThreadBeads()
{
COSArray beads = (COSArray)page.getDictionaryObject( COSName.B );
if( beads == null )
{
beads = new COSArray();
}
List pdObjects = new ArrayList();
for( int i=0; i<beads.size(); i++)
{
COSDictionary beadDic = (COSDictionary)beads.getObject( i );
PDThreadBead bead = null;
//in some cases the bead is null
if( beadDic != null )
{
bead = new PDThreadBead( beadDic );
}
pdObjects.add( bead );
}
return new COSArrayList(pdObjects, beads);
}
/**
* This will set the list of thread beads.
*
* @param beads A list of PDThreadBead objects or null.
*/
public void setThreadBeads( List beads )
{
page.setItem( COSName.B, COSArrayList.converterToCOSArray( beads ) );
}
/**
* Get the metadata that is part of the document catalog. This will
* return null if there is no meta data for this object.
*
* @return The metadata for this object.
*/
public PDMetadata getMetadata()
{
PDMetadata retval = null;
COSStream stream = (COSStream)page.getDictionaryObject( COSName.METADATA );
if( stream != null )
{
retval = new PDMetadata( stream );
}
return retval;
}
/**
* Set the metadata for this object. This can be null.
*
* @param meta The meta data for this object.
*/
public void setMetadata( PDMetadata meta )
{
page.setItem( COSName.METADATA, meta );
}
/**
* Convert this page to an output image with 8 bits per pixel and the double
* default screen resolution.
*
* @return A graphical representation of this page.
*
* @throws IOException If there is an error drawing to the image.
*/
public BufferedImage convertToImage() throws IOException
{
//note we are doing twice as many pixels because
//the default size is not really good resolution,
//so create an image that is twice the size
//and let the client scale it down.
return convertToImage(8, 2 * DEFAULT_USER_SPACE_UNIT_DPI);
}
/**
* Convert this page to an output image.
*
* @param imageType the image type (see {@link BufferedImage}.TYPE_*)
* @param resolution the resolution in dpi (dots per inch)
* @return A graphical representation of this page.
*
* @throws IOException If there is an error drawing to the image.
*/
public BufferedImage convertToImage(int imageType, int resolution) throws IOException
{
PDRectangle mBox = findMediaBox();
float widthPt = mBox.getWidth();
float heightPt = mBox.getHeight();
float scaling = resolution / (float)DEFAULT_USER_SPACE_UNIT_DPI;
int widthPx = Math.round(widthPt * scaling);
int heightPx = Math.round(heightPt * scaling);
//TODO The following reduces accuracy. It should really be a Dimension2D.Float.
Dimension pageDimension = new Dimension( (int)widthPt, (int)heightPt );
BufferedImage retval = new BufferedImage( widthPx, heightPx, imageType );
Graphics2D graphics = (Graphics2D)retval.getGraphics();
graphics.setBackground( Color.WHITE );
graphics.clearRect( 0, 0, retval.getWidth(), retval.getHeight() );
graphics.scale( scaling, scaling );
PageDrawer drawer = new PageDrawer();
drawer.drawPage( graphics, this, pageDimension );
//TODO This could be done directly by manipulating the transformation matrix before painting.
//That could result in a better image quality.
try
{
int rotation = findRotation();
if (rotation == 90 || rotation == 270)
{
int w = retval.getWidth();
int h = retval.getHeight();
BufferedImage rotatedImg = new BufferedImage(w, h, retval.getType());
Graphics2D g = rotatedImg.createGraphics();
g.rotate(Math.toRadians(rotation), w/2, h/2);
g.drawImage(retval, null, 0, 0);
}
}
catch (ImagingOpException e)
{
log.warn("Unable to rotate page image", e);
}
return retval;
}
/**
* Get the page actions.
*
* @return The Actions for this Page
*/
public PDPageAdditionalActions getActions()
{
COSDictionary addAct = (COSDictionary) page.getDictionaryObject(COSName.AA);
if (addAct == null)
{
addAct = new COSDictionary();
page.setItem(COSName.AA, addAct);
}
return new PDPageAdditionalActions(addAct);
}
/**
* Set the page actions.
*
* @param actions The actions for the page.
*/
public void setActions( PDPageAdditionalActions actions )
{
page.setItem( COSName.AA, actions );
}
/**
* This will return a list of the Annotations for this page.
*
* @return List of the PDAnnotation objects.
*
* @throws IOException If there is an error while creating the annotations.
*/
public List getAnnotations() throws IOException
{
COSArrayList retval = null;
COSArray annots = (COSArray)page.getDictionaryObject(COSName.ANNOTS);
if (annots == null)
{
annots = new COSArray();
page.setItem(COSName.ANNOTS, annots);
retval = new COSArrayList(new ArrayList(), annots);
}
else
{
List actuals = new ArrayList();
for (int i=0; i < annots.size(); i++)
{
COSBase item = annots.getObject(i);
actuals.add( PDAnnotation.createAnnotation( item ) );
}
retval = new COSArrayList(actuals, annots);
}
return retval;
}
/**
* This will set the list of annotations.
*
* @param annots The new list of annotations.
*/
public void setAnnotations( List annots )
{
page.setItem( COSName.ANNOTS, COSArrayList.converterToCOSArray( annots ) );
}
/**
* {@inheritDoc}
*/
public int print(Graphics graphics, PageFormat pageFormat, int pageIndex)
throws PrinterException
{
int retval = Printable.PAGE_EXISTS;
try
{
PageDrawer drawer = new PageDrawer();
PDRectangle cropBox = findCropBox();
drawer.drawPage( graphics, this, cropBox.createDimension() );
}
catch( IOException io )
{
throw new PrinterIOException( io );
}
return retval;
}
/**
* {@inheritDoc}
*/
public boolean equals( Object other )
{
return other instanceof PDPage && ((PDPage)other).getCOSObject() == this.getCOSObject();
}
/**
* {@inheritDoc}
*/
public int hashCode()
{
return this.getCOSDictionary().hashCode();
}
}