fop 2.1

org.apache.fop.pdf
Class PDFObject

java.lang.Object
  extended by org.apache.fop.pdf.PDFObject
All Implemented Interfaces:
PDFWritable
Direct Known Subclasses:
AbstractPDFStream, PDFAction, PDFAnnotList, PDFArray, PDFCharProcs, PDFCIDFont, PDFCIDSystemInfo, PDFDestination, PDFDictionary, PDFEncryptionJCE, PDFFunction, PDFGState, PDFICCBasedColorSpace, PDFInfo, PDFLink, PDFName, PDFNumber, PDFNumsArray, PDFOutline, PDFOutputIntent, PDFPages, PDFPathPaint, PDFShading, PDFText

public abstract class PDFObject
extends java.lang.Object
implements PDFWritable

generic PDF object. A PDF Document is essentially a collection of these objects. A PDF Object has a number and a generation (although the generation will always be 0 in new documents).


Field Summary
protected static org.apache.commons.logging.Log log
          logger for all PDFObjects (and descendants)
 
Constructor Summary
PDFObject()
          Default constructor.
PDFObject(PDFObject parent)
          Constructor for direct objects.
 
Method Summary
protected  boolean contentEquals(PDFObject o)
          Check if the other PDFObject has the same content as the current object.
static byte[] encode(java.lang.String text)
          Converts text to a byte array for writing to a PDF file.
protected  void encodeBinaryToHexString(byte[] data, java.io.OutputStream out)
          Encodes binary data as hexadecimal string object.
protected  byte[] encodeString(java.lang.String string)
          Encodes a String (3.2.3 in PDF 1.4 specs)
protected  byte[] encodeText(java.lang.String text)
          Encodes a Text String (3.8.1 in PDF 1.4 specs)
protected  void formatObject(java.lang.Object obj, java.io.OutputStream out, java.lang.StringBuilder textBuffer)
          Formats an object for serialization to PDF.
 void getChildren(java.util.Set<PDFObject> children)
           
 PDFDocument getDocument()
          Returns the parent PDFDocument if assigned.
 PDFDocument getDocumentSafely()
          Returns the parent PDFDocument, but unlike getDocument() it throws an informative Exception if the parent document is unavailable instead of having a NullPointerException somewhere without a message.
 int getGeneration()
          Returns this object's generation.
 java.lang.String getObjectID()
          Returns the PDF representation of the Object ID.
 PDFObjectNumber getObjectNumber()
          Returns the object's number.
 PDFObject getParent()
          Returns this objects's parent.
 boolean hasObjectNumber()
          Indicates whether this PDFObject has already been assigned an object number.
 PDFReference makeReference()
          Creates and returns a reference to this object.
 int output(java.io.OutputStream stream)
          Write the PDF represention of this object
 void outputInline(java.io.OutputStream out, java.lang.StringBuilder textBuffer)
          Writes a "direct object" (inline object) representation to the stream.
 java.lang.String referencePDF()
          Returns the PDF representation of a reference to this object.
 void setDocument(PDFDocument doc)
          Sets the parent PDFDocument.
 void setObjectNumber(int objectNumber)
           
 void setObjectNumber(PDFDocument document)
          Sets the object number
 void setObjectNumber(PDFObjectNumber objectNumber)
           
 void setParent(PDFObject parent)
          Sets the direct parent object.
protected  byte[] toPDF()
          Encodes the object as a byte array for output to a PDF file.
protected  java.lang.String toPDFString()
          This method returns a String representation of the PDF object.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

log

protected static final org.apache.commons.logging.Log log
logger for all PDFObjects (and descendants)

Constructor Detail

PDFObject

public PDFObject()
Default constructor.


PDFObject

public PDFObject(PDFObject parent)
Constructor for direct objects.

Parameters:
parent - the containing PDFObject instance
Method Detail

getObjectNumber

public PDFObjectNumber getObjectNumber()
Returns the object's number.

Returns:
the PDF Object number

hasObjectNumber

public boolean hasObjectNumber()
Indicates whether this PDFObject has already been assigned an object number.

Returns:
True if it has an object number

setObjectNumber

public void setObjectNumber(PDFDocument document)
Sets the object number


setObjectNumber

public void setObjectNumber(PDFObjectNumber objectNumber)

setObjectNumber

public void setObjectNumber(int objectNumber)

getGeneration

public int getGeneration()
Returns this object's generation.

Returns:
the PDF Object generation

getDocument

public final PDFDocument getDocument()
Returns the parent PDFDocument if assigned.

Returns:
the parent PDFDocument (May be null if the parent PDFDocument has not been assigned)

getDocumentSafely

public final PDFDocument getDocumentSafely()
Returns the parent PDFDocument, but unlike getDocument() it throws an informative Exception if the parent document is unavailable instead of having a NullPointerException somewhere without a message.

Returns:
the parent PDFDocument

setDocument

public void setDocument(PDFDocument doc)
Sets the parent PDFDocument.

Parameters:
doc - the PDFDocument.

getParent

public PDFObject getParent()
Returns this objects's parent. The parent is null if it is a "direct object".

Returns:
the parent or null if there's no parent (or it hasn't been set)

setParent

public void setParent(PDFObject parent)
Sets the direct parent object.

Parameters:
parent - the direct parent

getObjectID

public java.lang.String getObjectID()
Returns the PDF representation of the Object ID.

Returns:
the Object ID

referencePDF

public java.lang.String referencePDF()
Returns the PDF representation of a reference to this object.

Returns:
the reference string

makeReference

public PDFReference makeReference()
Creates and returns a reference to this object.

Returns:
the object reference

output

public int output(java.io.OutputStream stream)
           throws java.io.IOException
Write the PDF represention of this object

Parameters:
stream - the stream to write the PDF to
Returns:
the number of bytes written
Throws:
java.io.IOException - if there is an error writing to the stream

outputInline

public void outputInline(java.io.OutputStream out,
                         java.lang.StringBuilder textBuffer)
                  throws java.io.IOException
Writes a "direct object" (inline object) representation to the stream. A text buffer is given for optimized encoding of text content.

IMPORTANT: If you need to write out binary output, call PDFDocument.flushTextBuffer(StringBuilder, OutputStream) before writing any content to the OutputStream!

Specified by:
outputInline in interface PDFWritable
Parameters:
out - the OutputStream (for binary content)
textBuffer - the text buffer for text content
Throws:
java.io.IOException - if an I/O error occurs

toPDF

protected byte[] toPDF()
Encodes the object as a byte array for output to a PDF file.

Returns:
PDF string

toPDFString

protected java.lang.String toPDFString()
This method returns a String representation of the PDF object. The result is normally converted/encoded to a byte array by toPDF(). Only use this method to implement the serialization if the object can be fully represented as text. If the PDF representation of the object contains binary content use toPDF() or output(OutputStream) instead. This applies to any object potentially containing a string object because string object are encrypted and therefore need to be binary.

Returns:
String the String representation

encode

public static final byte[] encode(java.lang.String text)
Converts text to a byte array for writing to a PDF file.

Parameters:
text - text to convert/encode
Returns:
byte[] the resulting byte array

encodeText

protected byte[] encodeText(java.lang.String text)
Encodes a Text String (3.8.1 in PDF 1.4 specs)

Parameters:
text - the text to encode
Returns:
byte[] the encoded text

encodeString

protected byte[] encodeString(java.lang.String string)
Encodes a String (3.2.3 in PDF 1.4 specs)

Parameters:
string - the string to encode
Returns:
byte[] the encoded string

encodeBinaryToHexString

protected void encodeBinaryToHexString(byte[] data,
                                       java.io.OutputStream out)
                                throws java.io.IOException
Encodes binary data as hexadecimal string object.

Parameters:
data - the binary data
out - the OutputStream to write the encoded object to
Throws:
java.io.IOException - if an I/O error occurs

formatObject

protected void formatObject(java.lang.Object obj,
                            java.io.OutputStream out,
                            java.lang.StringBuilder textBuffer)
                     throws java.io.IOException
Formats an object for serialization to PDF.

IMPORTANT: If you need to write out binary output, call PDFDocument.flushTextBuffer(StringBuilder, OutputStream) before writing any content to the OutputStream!

Parameters:
obj - the object
out - the OutputStream to write to
textBuffer - a text buffer for text output
Throws:
java.io.IOException - If an I/O error occurs

contentEquals

protected boolean contentEquals(PDFObject o)
Check if the other PDFObject has the same content as the current object.

Note: This function has a contract which is less binding than Object.equals(Object). Whereas equals would require all values to be identical, this method is not required to check everything. In the case of PDFObjects, this means that the overriding function does not have to check for getObjectID().

Parameters:
o - object to compare to.
Returns:
true if the other object has the same content.

getChildren

public void getChildren(java.util.Set<PDFObject> children)

fop 2.1

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