Package org.apache.poi.hpsf

Class Property

java.lang.Object

org.apache.poi.hpsf.Property

Direct Known Subclasses:

CustomProperty

public class Property
extends Object

A property in a Section of a PropertySet.

The property's ID gives the property a meaning in the context of its Section. Each Section spans its own name space of property IDs.

The property's type determines how its value is interpreted. For example, if the type is Variant.VT_LPSTR (byte string), the value consists of a DWord telling how many bytes the string contains. The bytes follow immediately, including any null bytes that terminate the string. The type Variant.VT_I4 denotes a four-byte integer value, Variant.VT_FILETIME some date and time (of a file).

Please note that not all Variant types yet. This might change over time but largely depends on your feedback so that the POI team knows which variant types are really needed. So please feel free to submit error reports or patches for the types you need.

See Also:

Section, Variant, [MS-OLEPS]: Object Linking and Embedding (OLE) Property Set Data Structures

Field Summary

Fields

Modifier and Type	Field	Description
static int	DEFAULT_CODEPAGE	Default codepage for CodePageStrings

Constructor Summary

Constructors

Constructor	Description
Property()	Creates an empty property.
Property(long id, byte[] src, long offset, int length, int codepage)	Creates a Property instance by reading its bytes from the property set stream.
Property(long id, long type, Object value)	Creates a property.
Property(long id, LittleEndianByteArrayInputStream leis, int length, int codepage)	Creates a Property instance by reading its bytes from the property set stream.
Property(Property p)	Creates a Property as a copy of an existing Property.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)	Compares two properties.
long	getID()	Returns the property's ID.
protected int	getSize(int property)	Returns the property's size in bytes.
long	getType()	Returns the property's type.
Object	getValue()	Returns the property's value.
int	hashCode()
void	setID(long id)	Sets the property's ID.
void	setType(long type)	Sets the property's type.
void	setValue(Object value)	Sets the property's value.
String	toString()
String	toString(int codepage, PropertyIDMap idMap)
int	write(OutputStream out, int codepage)	Writes the property to an output stream.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_CODEPAGE

public static final int DEFAULT_CODEPAGE

Default codepage for CodePageStrings

See Also:

Constant Field Values

Constructor Detail

Property

public Property()

Creates an empty property. It must be filled using the set method to be usable.

Property

public Property(Property p)

Creates a Property as a copy of an existing Property.

Parameters:

p - The property to copy.

Property

public Property(long id,
                long type,
                Object value)

Creates a property.

Parameters:

id - the property's ID.

type - the property's type, see Variant.

value - the property's value. Only certain types are allowed, see Variant.

Property

public Property(long id,
                byte[] src,
                long offset,
                int length,
                int codepage)
         throws UnsupportedEncodingException

Creates a Property instance by reading its bytes from the property set stream.

Parameters:

id - The property's ID.

src - The bytes the property set stream consists of.

offset - The property's type/value pair's offset in the section.

length - The property's type/value pair's length in bytes.

codepage - The section's and thus the property's codepage. It is needed only when reading string values.

Throws:

UnsupportedEncodingException - if the specified codepage is not supported.

Property

public Property(long id,
                LittleEndianByteArrayInputStream leis,
                int length,
                int codepage)
         throws UnsupportedEncodingException

Creates a Property instance by reading its bytes from the property set stream.

Parameters:

id - The property's ID.

leis - The bytes the property set stream consists of.

length - The property's type/value pair's length in bytes.

codepage - The section's and thus the property's codepage. It is needed only when reading string values.

Throws:

UnsupportedEncodingException - if the specified codepage is not supported.

Method Detail

getID

public long getID()

Returns the property's ID.

Returns:

The ID value

setID

public void setID(long id)

Sets the property's ID.

Parameters:

id - the ID

getType

public long getType()

Returns the property's type.

Returns:

The type value

setType

public void setType(long type)

Sets the property's type.

Parameters:

type - the property's type

getValue

public Object getValue()

Returns the property's value.

Returns:

The property's value

setValue

public void setValue(Object value)

Sets the property's value.

Parameters:

value - the property's value

getSize

protected int getSize(int property)
               throws WritingNotSupportedException

Returns the property's size in bytes. This is always a multiple of 4.

Parameters:

property - The integer property to check

Returns:

the property's size in bytes

Throws:

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

equals

public boolean equals(Object o)

Compares two properties.

Please beware that a property with ID == 0 is a special case: It does not have a type, and its value is the section's dictionary. Another special case are strings: Two properties may have the different types Variant.VT_LPSTR and Variant.VT_LPWSTR;

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

toString

public String toString(int codepage,
                       PropertyIDMap idMap)

write

public int write(OutputStream out,
                 int codepage)
          throws IOException,
                 WritingNotSupportedException

Writes the property to an output stream.

Parameters:

out - The output stream to write to.

codepage - The codepage to use for writing non-wide strings

Returns:

the number of bytes written to the stream

Throws:

IOException - if an I/O error occurs

WritingNotSupportedException - if a variant type is to be written that is not yet supported