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## org.apache.fop.pdf
Class PDFObject

    java.lang.Object
      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)

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