Class PdfStream

java.lang.Object

com.aowagie.text.pdf.PdfObject

com.aowagie.text.pdf.PdfDictionary

com.aowagie.text.pdf.PdfStream

Direct Known Subclasses:

PdfImage, PRStream

public class PdfStream
extends PdfDictionary

PdfStream is the Pdf stream object.

A stream, like a string, is a sequence of characters. However, an application can read a small portion of a stream at a time, while a string must be read in its entirety. For this reason, objects with potentially large amounts of data, such as images and page descriptions, are represented as streams.
A stream consists of a dictionary that describes a sequence of characters, followed by the keyword stream, followed by zero or more lines of characters, followed by the keyword endstream.
All streams must be PdfIndirectObjects. The stream dictionary must be a direct object. The keyword stream that follows the stream dictionary should be followed by a carriage return and linefeed or just a linefeed.
Remark: In this version only the FLATEDECODE-filter is supported.
This object is described in the 'Portable Document Format Reference Manual version 1.7' section 3.2.7 (page 60-63).

See Also:

• PdfObject
• PdfDictionary

Field Summary

Fields

Modifier and Type	Field	Description
static final int	BEST_COMPRESSION	A possible compression level.
protected boolean	compressed	is the stream compressed?
protected int	compressionLevel	The level of compression.
static final int	DEFAULT_COMPRESSION	A possible compression level.
protected InputStream	inputStream
protected int	inputStreamLength
static final int	NO_COMPRESSION	A possible compression level.
protected int	rawLength
protected ByteArrayOutputStream	streamBytes

Fields inherited from class PdfDictionary

hashMap

Fields inherited from class PdfObject

ARRAY, bytes, INDIRECT, STREAM, TEXT_UNICODE, type

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	PdfStream()	Constructs a PdfStream-object.
	PdfStream(byte[] bytes)	Constructs a PdfStream-object.

Method Summary

Modifier and Type	Method	Description
int	getRawLength()	Gets the raw length of the stream.
protected void	superToPdf(PdfWriter writer, OutputStream os)
void	toPdf(PdfWriter writer, OutputStream os)	Writes the PDF representation of this PdfDictionary as an array of byte to the given OutputStream.
String	toString()	Returns a string representation of this PdfDictionary.

Methods inherited from class PdfDictionary

get, getAsArray, getAsDict, getAsName, getAsNumber, getAsString, getDirectObject, getKeys, isCatalog, isFont, isOutlineTree, isPage, isPages, put, remove, size

Methods inherited from class PdfObject

getBytes, getIndRef, isArray, isBoolean, isDictionary, isIndirect, isName, isNull, isNumber, isStream, isString, setContent, setIndRef, type

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

DEFAULT_COMPRESSION

public static final int DEFAULT_COMPRESSION

A possible compression level.

Since:

2.1.3

See Also:

• Constant Field Values

NO_COMPRESSION

public static final int NO_COMPRESSION

A possible compression level.

Since:

2.1.3

See Also:

• Constant Field Values

BEST_COMPRESSION

public static final int BEST_COMPRESSION

A possible compression level.

Since:

2.1.3

See Also:

• Constant Field Values

compressed

protected boolean compressed

is the stream compressed?

compressionLevel

protected int compressionLevel

The level of compression.

Since:

2.1.3

streamBytes

protected ByteArrayOutputStream streamBytes

inputStream

protected InputStream inputStream

inputStreamLength

protected int inputStreamLength

rawLength

protected int rawLength

Constructor Details

PdfStream

public PdfStream(byte[] bytes)

Constructs a PdfStream-object.

Parameters:

bytes - content of the new PdfObject as an array of byte.

PdfStream

protected PdfStream()

Constructs a PdfStream-object.

Method Details

getRawLength

public int getRawLength()

Gets the raw length of the stream.

Returns:

the raw length of the stream

superToPdf

protected void superToPdf(PdfWriter writer,
 OutputStream os)
                   throws IOException

Throws:

IOException

toPdf

public void toPdf(PdfWriter writer,
 OutputStream os)
           throws IOException

Description copied from class: PdfDictionary

Writes the PDF representation of this PdfDictionary as an array of byte to the given OutputStream.

Overrides:

toPdf in class PdfDictionary

Parameters:

writer - for backwards compatibility

os - the OutputStream to write the bytes to.

Throws:

IOException - Exception with a I/O error

See Also:

• PdfDictionary.toPdf(com.aowagie.text.pdf.PdfWriter, java.io.OutputStream)

toString

public String toString()

Description copied from class: PdfDictionary

Returns a string representation of this PdfDictionary. The string doesn't contain any of the content of this dictionary. Rather the string "dictionary" is returned, possibly followed by the type of this PdfDictionary, if set.

Overrides:

toString in class PdfDictionary

Returns:

the string representation of this PdfDictionary

See Also:

• PdfObject.toString()