org.apache.poi.hslf.usermodel

Class HSLFPictureData

java.lang.Object

org.apache.poi.hslf.usermodel.HSLFPictureData

All Implemented Interfaces:

PictureData

Direct Known Subclasses:

Bitmap, Metafile

public abstract class HSLFPictureData
extends java.lang.Object
implements PictureData

A class that represents image data contained in a slide show.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.poi.sl.usermodel.PictureData

PictureData.PictureType

Field Summary

Fields

Modifier and Type	Field and Description
protected static int	CHECKSUM_SIZE Size of the image checksum calculated using MD5 algorithm.

Constructor Summary

Constructors

Constructor and Description
HSLFPictureData()

Method Summary

Modifier and Type	Method and Description
static HSLFPictureData	create(PictureData.PictureType type) Create an instance of PictureData by type.
byte[]	getChecksum() Gets the checksum - the checksum can be of various length - mostly it's 8 (XSLF) or 16 (HSLF) bytes long.
static byte[]	getChecksum(byte[] data) Compute 16-byte checksum of this picture using MD5 algorithm.
java.lang.String	getContentType() Returns content type (mime type) of this picture.
byte[]	getHeader() Return 24 byte header which preceeds the actual picture data.
java.awt.Dimension	getImageDimensionInPixels() Return the original image dimensions in pixels
int	getIndex()
int	getOffset() File offset in the 'Pictures' stream
byte[]	getRawData() Returns the raw binary data of this Picture excluding the first 8 bytes which hold image signature and size of the image data.
protected abstract int	getSignature() Blip signature.
byte[]	getUID() Returns 16-byte checksum of this picture
protected int	getUIDInstanceCount() The instance type/signatures defines if one or two UID instances will be included
void	setIndex(int index)
void	setOffset(int offset) Set offset of this picture in the 'Pictures' stream.
void	setRawData(byte[] data)
abstract void	setSignature(int signature)
protected void	setUIDInstanceCount(int uidInstanceCount) The instance type/signatures defines if one or two UID instances will be included
void	write(java.io.OutputStream out) Write this picture into OutputStream

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.poi.sl.usermodel.PictureData

getData, getImageDimension, getType, setData

Field Detail

CHECKSUM_SIZE

protected static final int CHECKSUM_SIZE

Size of the image checksum calculated using MD5 algorithm.

See Also:

Constant Field Values

Constructor Detail

HSLFPictureData

public HSLFPictureData()

Method Detail

getSignature

protected abstract int getSignature()

Blip signature.

setSignature

public abstract void setSignature(int signature)

getUIDInstanceCount

protected int getUIDInstanceCount()

The instance type/signatures defines if one or two UID instances will be included

setUIDInstanceCount

protected void setUIDInstanceCount(int uidInstanceCount)

The instance type/signatures defines if one or two UID instances will be included

Parameters:

uidInstanceCount - the number of uid sequences

getRawData

public byte[] getRawData()

Returns the raw binary data of this Picture excluding the first 8 bytes which hold image signature and size of the image data.

Returns:

picture data

setRawData

public void setRawData(byte[] data)

getOffset

public int getOffset()

File offset in the 'Pictures' stream

Returns:

offset in the 'Pictures' stream

setOffset

public void setOffset(int offset)

Set offset of this picture in the 'Pictures' stream. We need to set it when a new picture is created.

Parameters:

offset - in the 'Pictures' stream

getUID

public byte[] getUID()

Returns 16-byte checksum of this picture

getChecksum

public byte[] getChecksum()

Description copied from interface: PictureData

Gets the checksum - the checksum can be of various length - mostly it's 8 (XSLF) or 16 (HSLF) bytes long.

Specified by:

getChecksum in interface PictureData

Returns:

the checksum

getChecksum

public static byte[] getChecksum(byte[] data)

Compute 16-byte checksum of this picture using MD5 algorithm.

write

public void write(java.io.OutputStream out)
           throws java.io.IOException

Write this picture into OutputStream

Throws:

java.io.IOException

create

public static HSLFPictureData create(PictureData.PictureType type)

Create an instance of PictureData by type.

Parameters:

type - type of the picture data. Must be one of the static constants defined in the Picture class.

Returns:

concrete instance of PictureData

getHeader

public byte[] getHeader()

Return 24 byte header which preceeds the actual picture data.

The header consists of 2-byte signature, 2-byte type, 4-byte image size and 16-byte checksum of the image data.

Returns:

the 24 byte header which preceeds the actual picture data.

getIndex

public int getIndex()

Returns:

the 1-based index of this pictures within the pictures stream

setIndex

public void setIndex(int index)

Parameters:

index - sets the 1-based index of this pictures within the pictures stream

getContentType

public final java.lang.String getContentType()

Description copied from interface: PictureData

Returns content type (mime type) of this picture.

Specified by:

getContentType in interface PictureData

Returns:

content type of this picture.

getImageDimensionInPixels

public java.awt.Dimension getImageDimensionInPixels()

Description copied from interface: PictureData

Return the original image dimensions in pixels

Specified by:

getImageDimensionInPixels in interface PictureData

See Also:

PictureData.getImageDimension()