loci.poi.hpsf

Class SpecialPropertySet

java.lang.Object

loci.poi.hpsf.PropertySet

loci.poi.hpsf.MutablePropertySet

loci.poi.hpsf.SpecialPropertySet

Direct Known Subclasses:

DocumentSummaryInformation, SummaryInformation

public abstract class SpecialPropertySet
extends MutablePropertySet

Abstract superclass for the convenience classes SummaryInformation and DocumentSummaryInformation.

The motivation behind this class is quite nasty if you look behind the scenes, but it serves the application programmer well by providing him with the easy-to-use SummaryInformation and DocumentSummaryInformation classes. When parsing the data a property set stream consists of (possibly coming from an InputStream) we want to read and process each byte only once. Since we don't know in advance which kind of property set we have, we can expect only the most general PropertySet. Creating a special subclass should be as easy as calling the special subclass' constructor and pass the general PropertySet in. To make things easy internally, the special class just holds a reference to the general PropertySet and delegates all method calls to it.

A cleaner implementation would have been like this: The PropertySetFactory parses the stream data into some internal object first. Then it finds out whether the stream is a SummaryInformation, a DocumentSummaryInformation or a general PropertySet. However, the current implementation went the other way round historically: the convenience classes came only late to my mind.

Since:

2002-02-09

Version:

$Id: SpecialPropertySet.java 489730 2006-12-22 19:18:16Z bayard $

Author:

Rainer Klute <klute@rainer-klute.de>

Field Summary

Fields

Modifier and Type	Field and Description
private MutablePropertySet	delegate The "real" property set SpecialPropertySet delegates to.

Fields inherited from class loci.poi.hpsf.PropertySet

BYTE_ORDER_ASSERTION, byteOrder, classID, format, FORMAT_ASSERTION, OS_MACINTOSH, OS_WIN16, OS_WIN32, osVersion, sections

Constructor Summary

Constructors

Constructor and Description
SpecialPropertySet(MutablePropertySet ps) Creates a SpecialPropertySet.
SpecialPropertySet(PropertySet ps) Creates a SpecialPropertySet.

Method Summary

Methods

Modifier and Type	Method and Description
void	addSection(Section section) Adds a section to this property set.
void	clearSections() Removes all sections from this property set.
boolean	equals(Object o) Returns true if the PropertySet is equal to the specified parameter, else false.
int	getByteOrder() Returns the property set stream's low-level "byte order" field.
ClassID	getClassID() Returns the property set stream's low-level "class ID" field.
Section	getFirstSection() Gets the PropertySet's first section.
int	getFormat() Returns the property set stream's low-level "format" field.
int	getOSVersion() Returns the property set stream's low-level "OS version" field.
Property[]	getProperties() Convenience method returning the Property array contained in this property set.
protected Object	getProperty(int id) Convenience method returning the value of the property with the specified ID.
protected boolean	getPropertyBooleanValue(int id) Convenience method returning the value of a boolean property with the specified ID.
protected int	getPropertyIntValue(int id) Convenience method returning the value of the numeric property with the specified ID.
int	getSectionCount() Returns the number of Sections in the property set.
List	getSections() Returns the Sections in the property set.
int	hashCode()
boolean	isDocumentSummaryInformation() Checks whether this PropertySet is a Document Summary Information.
boolean	isSummaryInformation() Checks whether this PropertySet represents a Summary Information.
void	setByteOrder(int byteOrder) Sets the "byteOrder" property.
void	setClassID(ClassID classID) Sets the property set stream's low-level "class ID" field.
void	setFormat(int format) Sets the "format" property.
void	setOSVersion(int osVersion) Sets the "osVersion" property.
RandomAccessInputStream	toInputStream() Returns the contents of this property set stream as an input stream.
String	toString()
boolean	wasNull() Checks whether the property which the last call to PropertySet.getPropertyIntValue(int) or PropertySet.getProperty(int) tried to access was available or not.
void	write(DirectoryEntry dir, String name) Writes a property set to a document in a POI filesystem directory.
void	write(OutputStream out) Writes the property set to an output stream.

Methods inherited from class loci.poi.hpsf.PropertySet

getSingleSection, isPropertySetStream, isPropertySetStream

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

delegate

private MutablePropertySet delegate

The "real" property set SpecialPropertySet delegates to.

Constructor Detail

SpecialPropertySet

public SpecialPropertySet(PropertySet ps)

Creates a SpecialPropertySet.

Parameters:

ps - The property set to be encapsulated by the SpecialPropertySet

SpecialPropertySet

public SpecialPropertySet(MutablePropertySet ps)

Creates a SpecialPropertySet.

Parameters:

ps - The mutable property set to be encapsulated by the SpecialPropertySet

Method Detail

getByteOrder

public int getByteOrder()

Description copied from class: PropertySet

Returns the property set stream's low-level "byte order" field. It is always 0xFFFE .

Overrides:

getByteOrder in class PropertySet

Returns:

The property set stream's low-level "byte order" field.

See Also:

PropertySet.getByteOrder()

getFormat

public int getFormat()

Description copied from class: PropertySet

Returns the property set stream's low-level "format" field. It is always 0x0000 .

Overrides:

getFormat in class PropertySet

Returns:

The property set stream's low-level "format" field.

See Also:

PropertySet.getFormat()

getOSVersion

public int getOSVersion()

Description copied from class: PropertySet

Returns the property set stream's low-level "OS version" field.

Overrides:

getOSVersion in class PropertySet

Returns:

The property set stream's low-level "OS version" field.

See Also:

PropertySet.getOSVersion()

getClassID

public ClassID getClassID()

Description copied from class: PropertySet

Returns the property set stream's low-level "class ID" field.

Overrides:

getClassID in class PropertySet

Returns:

The property set stream's low-level "class ID" field.

See Also:

PropertySet.getClassID()

getSectionCount

public int getSectionCount()

Description copied from class: PropertySet

Returns the number of Sections in the property set.

Overrides:

getSectionCount in class PropertySet

Returns:

The number of Sections in the property set.

See Also:

PropertySet.getSectionCount()

getSections

public List getSections()

Description copied from class: PropertySet

Returns the Sections in the property set.

Overrides:

getSections in class PropertySet

Returns:

The Sections in the property set.

See Also:

PropertySet.getSections()

isSummaryInformation

public boolean isSummaryInformation()

Description copied from class: PropertySet

Checks whether this PropertySet represents a Summary Information.

Overrides:

isSummaryInformation in class PropertySet

Returns:

true if this PropertySet represents a Summary Information, else false.

See Also:

PropertySet.isSummaryInformation()

isDocumentSummaryInformation

public boolean isDocumentSummaryInformation()

Description copied from class: PropertySet

Checks whether this PropertySet is a Document Summary Information.

Overrides:

isDocumentSummaryInformation in class PropertySet

Returns:

true if this PropertySet represents a Document Summary Information, else false.

See Also:

PropertySet.isDocumentSummaryInformation()

getFirstSection

public Section getFirstSection()

Description copied from class: PropertySet

Gets the PropertySet's first section.

Overrides:

getFirstSection in class PropertySet

Returns:

The PropertySet's first section.

See Also:

PropertySet.getSingleSection()

addSection

public void addSection(Section section)

Description copied from class: MutablePropertySet

Adds a section to this property set.

Overrides:

addSection in class MutablePropertySet

Parameters:

section - The Section to add. It will be appended after any sections that are already present in the property set and thus become the last section.

See Also:

MutablePropertySet.addSection(loci.poi.hpsf.Section)

clearSections

public void clearSections()

Description copied from class: MutablePropertySet

Removes all sections from this property set.

Overrides:

clearSections in class MutablePropertySet

See Also:

MutablePropertySet.clearSections()

setByteOrder

public void setByteOrder(int byteOrder)

Description copied from class: MutablePropertySet

Sets the "byteOrder" property.

Overrides:

setByteOrder in class MutablePropertySet

Parameters:

byteOrder - the byteOrder value to set

See Also:

MutablePropertySet.setByteOrder(int)

setClassID

public void setClassID(ClassID classID)

Description copied from class: MutablePropertySet

Sets the property set stream's low-level "class ID" field.

Overrides:

setClassID in class MutablePropertySet

Parameters:

classID - The property set stream's low-level "class ID" field.

See Also:

MutablePropertySet.setClassID(loci.poi.hpsf.ClassID)

setFormat

public void setFormat(int format)

Description copied from class: MutablePropertySet

Sets the "format" property.

Overrides:

setFormat in class MutablePropertySet

Parameters:

format - the format value to set

See Also:

MutablePropertySet.setFormat(int)

setOSVersion

public void setOSVersion(int osVersion)

Description copied from class: MutablePropertySet

Sets the "osVersion" property.

Overrides:

setOSVersion in class MutablePropertySet

Parameters:

osVersion - the osVersion value to set

See Also:

MutablePropertySet.setOSVersion(int)

toInputStream

public RandomAccessInputStream toInputStream()
                                      throws IOException,
                                             WritingNotSupportedException

Description copied from class: MutablePropertySet

Returns the contents of this property set stream as an input stream. The latter can be used for example to write the property set into a POIFS document. The input stream represents a snapshot of the property set. If the latter is modified while the input stream is still being read, the modifications will not be reflected in the input stream but in the MutablePropertySet only.

Overrides:

toInputStream in class MutablePropertySet

Returns:

the contents of this property set stream

Throws:

IOException - if an I/O exception occurs.

WritingNotSupportedException - if HPSF does not yet support writing of a property's variant type.

See Also:

MutablePropertySet.toInputStream()

write

public void write(DirectoryEntry dir,
         String name)
           throws WritingNotSupportedException,
                  IOException

Description copied from class: MutablePropertySet

Writes a property set to a document in a POI filesystem directory.

Overrides:

write in class MutablePropertySet

Parameters:

dir - The directory in the POI filesystem to write the document to.

name - The document's name. If there is already a document with the same name in the directory the latter will be overwritten.

Throws:

WritingNotSupportedException

IOException

See Also:

MutablePropertySet.write(loci.poi.poifs.filesystem.DirectoryEntry, java.lang.String)

write

public void write(OutputStream out)
           throws WritingNotSupportedException,
                  IOException

Description copied from class: MutablePropertySet

Writes the property set to an output stream.

Overrides:

write in class MutablePropertySet

Parameters:

out - the output stream to write the section to

Throws:

WritingNotSupportedException - if HPSF does not yet support writing a property's variant type.

IOException - if an error when writing to the output stream occurs

See Also:

MutablePropertySet.write(java.io.OutputStream)

equals

public boolean equals(Object o)

Description copied from class: PropertySet

Returns true if the PropertySet is equal to the specified parameter, else false.

Overrides:

equals in class PropertySet

Parameters:

o - the object to compare this PropertySet with

Returns:

true if the objects are equal, false if not

See Also:

PropertySet.equals(java.lang.Object)

getProperties

public Property[] getProperties()
                         throws NoSingleSectionException

Description copied from class: PropertySet

Convenience method returning the Property array contained in this property set. It is a shortcut for getting the PropertySet's Sections list and then getting the Property array from the first Section.

Overrides:

getProperties in class PropertySet

Returns:

The properties of the only Section of this PropertySet.

Throws:

NoSingleSectionException - if the PropertySet has more or less than one Section.

See Also:

PropertySet.getProperties()

getProperty

protected Object getProperty(int id)
                      throws NoSingleSectionException

Description copied from class: PropertySet

Convenience method returning the value of the property with the specified ID. If the property is not available, null is returned and a subsequent call to PropertySet.wasNull() will return true .

Overrides:

getProperty in class PropertySet

Parameters:

id - The property ID

Returns:

The property value

Throws:

NoSingleSectionException - if the PropertySet has more or less than one Section.

See Also:

PropertySet.getProperty(int)

getPropertyBooleanValue

protected boolean getPropertyBooleanValue(int id)
                                   throws NoSingleSectionException

Description copied from class: PropertySet

Convenience method returning the value of a boolean property with the specified ID. If the property is not available, false is returned. A subsequent call to PropertySet.wasNull() will return true to let the caller distinguish that case from a real property value of false.

Overrides:

getPropertyBooleanValue in class PropertySet

Parameters:

id - The property ID

Returns:

The property value

Throws:

NoSingleSectionException - if the PropertySet has more or less than one Section.

See Also:

PropertySet.getPropertyBooleanValue(int)

getPropertyIntValue

protected int getPropertyIntValue(int id)
                           throws NoSingleSectionException

Description copied from class: PropertySet

Convenience method returning the value of the numeric property with the specified ID. If the property is not available, 0 is returned. A subsequent call to PropertySet.wasNull() will return true to let the caller distinguish that case from a real property value of 0.

Overrides:

getPropertyIntValue in class PropertySet

Parameters:

id - The property ID

Returns:

The propertyIntValue value

Throws:

NoSingleSectionException - if the PropertySet has more or less than one Section.

See Also:

PropertySet.getPropertyIntValue(int)

hashCode

public int hashCode()

Overrides:

hashCode in class PropertySet

See Also:

PropertySet.hashCode()

toString

public String toString()

Overrides:

toString in class PropertySet

See Also:

PropertySet.toString()

wasNull

public boolean wasNull()
                throws NoSingleSectionException

Description copied from class: PropertySet

Checks whether the property which the last call to PropertySet.getPropertyIntValue(int) or PropertySet.getProperty(int) tried to access was available or not. This information might be important for callers of PropertySet.getPropertyIntValue(int) since the latter returns 0 if the property does not exist. Using PropertySet.wasNull(), the caller can distiguish this case from a property's real value of 0.

Overrides:

wasNull in class PropertySet

Returns:

true if the last call to PropertySet.getPropertyIntValue(int) or PropertySet.getProperty(int) tried to access a property that was not available, else false.

Throws:

NoSingleSectionException - if the PropertySet has more than one Section.

See Also:

PropertySet.wasNull()