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Diffstat (limited to 'src/main/java/org/pdfbox/pdmodel/PDPage.java')
| -rw-r--r-- | src/main/java/org/pdfbox/pdmodel/PDPage.java | 776 |
1 files changed, 776 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/pdmodel/PDPage.java b/src/main/java/org/pdfbox/pdmodel/PDPage.java new file mode 100644 index 0000000..3739a5a --- /dev/null +++ b/src/main/java/org/pdfbox/pdmodel/PDPage.java @@ -0,0 +1,776 @@ +/**
+ * Copyright (c) 2003-2005, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * 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.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ * contributors may be used to endorse or promote products derived from this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.pdmodel;
+
+import org.pdfbox.cos.COSArray;
+import org.pdfbox.cos.COSBase;
+import org.pdfbox.cos.COSDictionary;
+import org.pdfbox.cos.COSInteger;
+import org.pdfbox.cos.COSName;
+import org.pdfbox.cos.COSNumber;
+import org.pdfbox.cos.COSStream;
+
+import org.pdfbox.pdfviewer.PageDrawer;
+import org.pdfbox.pdmodel.common.COSArrayList;
+import org.pdfbox.pdmodel.common.COSObjectable;
+import org.pdfbox.pdmodel.common.PDMetadata;
+import org.pdfbox.pdmodel.common.PDRectangle;
+import org.pdfbox.pdmodel.common.PDStream;
+import org.pdfbox.pdmodel.interactive.action.PDPageAdditionalActions;
+import org.pdfbox.pdmodel.interactive.annotation.PDAnnotation;
+import org.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.print.PageFormat;
+import java.awt.print.Paper;
+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 Ben Litchfield (ben@benlitchfield.com)
+ * @version $Revision: 1.24 $
+ */
+public class PDPage implements COSObjectable, Printable
+{
+ private COSDictionary page;
+
+ /**
+ * A page size of LETTER or 8.5x11.
+ */
+ public static final PDRectangle PAGE_SIZE_LETTER = new PDRectangle( 612, 792 );
+
+
+ /**
+ * 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()
+ {
+ PDPageNode parent = null;
+ COSDictionary parentDic = (COSDictionary)page.getDictionaryObject( COSName.PARENT );
+ if( parentDic != null )
+ {
+ parent = new PDPageNode( parentDic );
+ }
+ return parent;
+ }
+
+ /**
+ * This will set the parent of this page.
+ *
+ * @param parent The parent to this page node.
+ */
+ public void setParent( PDPageNode 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()
+ {
+ PDRectangle retval = null;
+ COSArray array = (COSArray)page.getDictionaryObject( COSName.MEDIA_BOX );
+ if( array != null )
+ {
+ retval = new PDRectangle( array );
+ }
+ return retval;
+ }
+
+ /**
+ * 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();
+ PDPageNode parent = getParent();
+ if( retval == null && parent != null )
+ {
+ retval = parent.findMediaBox();
+ }
+ return retval;
+ }
+
+ /**
+ * This will set the mediaBox for this page.
+ *
+ * @param mediaBox The new mediaBox for this page.
+ */
+ public void setMediaBox( PDRectangle 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.
+ *
+ * @return A graphical representation of this page.
+ *
+ * @throws IOException If there is an error drawing to the image.
+ */
+ public BufferedImage convertToImage() throws IOException
+ {
+ int scaling = 2;
+ int rotation = findRotation();
+ PDRectangle mBox = findMediaBox();
+ int width = (int)(mBox.getWidth());//*2);
+ int height = (int)(mBox.getHeight());//*2);
+ if( rotation == 90 || rotation == 270 )
+ {
+ int tmp = width;
+ width = height;
+ height = tmp;
+ }
+ Dimension pageDimension = new Dimension( width, height );
+
+ //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.
+ BufferedImage retval =
+ new BufferedImage( width*scaling, height*scaling, BufferedImage.TYPE_BYTE_INDEXED );
+ Graphics2D graphics = (Graphics2D)retval.getGraphics();
+ graphics.setColor( Color.WHITE );
+ graphics.fillRect(0,0,width*scaling, height*scaling);
+ graphics.scale( scaling, scaling );
+ PageDrawer drawer = new PageDrawer();
+ drawer.drawPage( graphics, this, pageDimension );
+
+
+ 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 ) );
+ }
+
+ /**
+ * @see Printable#print(java.awt.Graphics, java.awt.print.PageFormat, int)
+ */
+ public int print(Graphics graphics, PageFormat pageFormat, int pageIndex)
+ throws PrinterException
+ {
+ int retval = Printable.NO_SUCH_PAGE;
+ if( pageIndex == 0 )
+ {
+ try
+ {
+ retval = Printable.PAGE_EXISTS;
+ PageDrawer drawer = new PageDrawer();
+ PDRectangle pageSize = findMediaBox();
+ Paper paper = new Paper();
+
+ paper.setImageableArea( 0, 0, pageSize.getWidth(), pageSize.getHeight());
+ pageFormat.setPaper( paper );
+ drawer.drawPage( graphics, this, pageSize.createDimension() );
+
+ }
+ catch( IOException io )
+ {
+ throw new PrinterIOException( io );
+ }
+
+ }
+ return retval;
+ }
+
+ /**
+ * @see Object#equals( Object )
+ */
+ public boolean equals( Object other )
+ {
+ return other instanceof PDPage && ((PDPage)other).getCOSObject() == this.getCOSObject();
+ }
+
+ /**
+ * @see Object#hashCode()
+ */
+ public int hashCode()
+ {
+ return this.getCOSDictionary().hashCode();
+ }
+}
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