/*
* 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.graphics.form;
import java.awt.geom.AffineTransform;
import java.io.IOException;
import java.io.InputStream;
import org.apache.pdfbox.contentstream.PDContentStream;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSFloat;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.ResourceCache;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.common.PDStream;
import org.apache.pdfbox.pdmodel.graphics.PDXObject;
import org.apache.pdfbox.util.Matrix;
/*
TODO There are further Form XObjects to implement:
+ PDFormXObject
|- PDReferenceXObject
|- PDGroupXObject
|- PDTransparencyXObject
See PDF 32000 p111
When doing this all methods on PDFormXObject should probably be made
final and all fields private.
*/
/**
* A Form XObject.
*
* @author Ben Litchfield
*/
public class PDFormXObject extends PDXObject implements PDContentStream
{
private PDTransparencyGroupAttributes group;
private final ResourceCache cache;
/**
* Creates a Form XObject for reading.
* @param stream The XObject stream
*/
public PDFormXObject(PDStream stream)
{
super(stream, COSName.FORM);
cache = null;
}
/**
* Creates a Form XObject for reading.
* @param stream The XObject stream
*/
public PDFormXObject(COSStream stream)
{
super(stream, COSName.FORM);
cache = null;
}
/**
* Creates a Form XObject for reading.
* @param stream The XObject stream
*/
public PDFormXObject(COSStream stream, ResourceCache cache)
{
super(stream, COSName.FORM);
this.cache = cache;
}
/**
* Creates a Form Image XObject for writing, in the given document.
* @param document The current document
*/
public PDFormXObject(PDDocument document)
{
super(document, COSName.FORM);
cache = null;
}
/**
* This will get the form type, currently 1 is the only form type.
* @return The form type.
*/
public int getFormType()
{
return getCOSObject().getInt(COSName.FORMTYPE, 1);
}
/**
* Set the form type.
* @param formType The new form type.
*/
public void setFormType(int formType)
{
getCOSObject().setInt(COSName.FORMTYPE, formType);
}
/**
* Returns the group attributes dictionary.
*
* @return the group attributes dictionary
*/
public PDTransparencyGroupAttributes getGroup()
{
if( group == null )
{
COSDictionary dic = (COSDictionary) getCOSObject().getDictionaryObject(COSName.GROUP);
if( dic != null )
{
group = new PDTransparencyGroupAttributes(dic);
}
}
return group;
}
public PDStream getContentStream()
{
return new PDStream(getCOSObject());
}
@Override
public InputStream getContents() throws IOException
{
return getCOSObject().createInputStream();
}
/**
* This will get the resources for this Form XObject.
* This will return null if no resources are available.
*
* @return The resources for this Form XObject.
*/
@Override
public PDResources getResources()
{
COSDictionary resources = (COSDictionary) getCOSObject().getDictionaryObject(COSName.RESOURCES);
if (resources != null)
{
return new PDResources(resources, cache);
}
return null;
}
/**
* This will set the resources for this page.
* @param resources The new resources for this page.
*/
public void setResources(PDResources resources)
{
getCOSObject().setItem(COSName.RESOURCES, resources);
}
/**
* An array of four numbers in the form coordinate system (see below),
* giving the coordinates of the left, bottom, right, and top edges, respectively,
* of the form XObject's bounding box.
* These boundaries are used to clip the form XObject and to determine its size for caching.
* @return The BBox of the form.
*/
@Override
public PDRectangle getBBox()
{
PDRectangle retval = null;
COSArray array = (COSArray) getCOSObject().getDictionaryObject(COSName.BBOX);
if (array != null)
{
retval = new PDRectangle(array);
}
return retval;
}
/**
* This will set the BBox (bounding box) for this form.
* @param bbox The new BBox for this form.
*/
public void setBBox(PDRectangle bbox)
{
if (bbox == null)
{
getCOSObject().removeItem(COSName.BBOX);
}
else
{
getCOSObject().setItem(COSName.BBOX, bbox.getCOSArray());
}
}
/**
* This will get the optional Matrix of an XObjectForm. It maps the form space to user space.
* @return the form matrix if available, or the identity matrix.
*/
@Override
public Matrix getMatrix()
{
COSArray array = (COSArray) getCOSObject().getDictionaryObject(COSName.MATRIX);
if (array != null)
{
return new Matrix(array);
}
else
{
// default value is the identity matrix
return new Matrix();
}
}
/**
* Sets the optional Matrix entry for the form XObject.
* @param transform the transformation matrix
*/
public void setMatrix(AffineTransform transform)
{
COSArray matrix = new COSArray();
double[] values = new double[6];
transform.getMatrix(values);
for (double v : values)
{
matrix.add(new COSFloat((float) v));
}
getCOSObject().setItem(COSName.MATRIX, matrix);
}
/**
* This will get the key of this XObjectForm in the structural parent tree.
* Required if the form XObject contains marked-content sequences that are
* structural content items.
* @return the integer key of the XObjectForm's entry in the structural parent tree
*/
public int getStructParents()
{
return getCOSObject().getInt(COSName.STRUCT_PARENTS, 0);
}
/**
* This will set the key for this XObjectForm in the structural parent tree.
* @param structParent The new key for this XObjectForm.
*/
public void setStructParents(int structParent)
{
getCOSObject().setInt(COSName.STRUCT_PARENTS, structParent);
}
}