Module org.apache.jena.tdb

Package org.apache.jena.tdb1.base.objectfile

Class ObjectFileWrapper

java.lang.Object

org.apache.jena.tdb1.base.objectfile.ObjectFileWrapper

All Implemented Interfaces:

org.apache.jena.atlas.lib.Closeable, org.apache.jena.atlas.lib.Sync, ObjectFile

Direct Known Subclasses:

ObjectFileReadonly, ObjectFileSwitcher

public class ObjectFileWrapper
extends Object
implements ObjectFile

An ObjectFile is an append-read file, that is you can append data to the stream or read any block.

Field Summary

Fields inherited from interface org.apache.jena.tdb1.base.objectfile.ObjectFile

type

Constructor Summary

Constructors

Constructor	Description
ObjectFileWrapper(ObjectFile other)

Method Summary

Modifier and Type	Method	Description
Iterator<org.apache.jena.atlas.lib.Pair<Long,ByteBuffer>>	all()	All the contents as ByteBuffers - debugging aid
void	close()
String	getLabel()	A label to identify this ObjectFile
boolean	isEmpty()	Any objects in this file?
long	length()	Length, in units used by read/write for ids
ByteBuffer	read(long id)	Read a buffer at the accessor number.
void	reposition(long id)	Reset the "append" point; may only be moved earlier.
void	sync()
void	truncate(long size)	Truncate the file
long	write(ByteBuffer buffer)	Write out the buffer - return the accessor number

Methods inherited from class java.lang.Object

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

Constructor Details

ObjectFileWrapper

public ObjectFileWrapper(ObjectFile other)

Method Details

write

public long write(ByteBuffer buffer)

Description copied from interface: ObjectFile

Write out the buffer - return the accessor number

Specified by:

write in interface ObjectFile

reposition

public void reposition(long id)

Description copied from interface: ObjectFile

Reset the "append" point; may only be moved earlier. The new position must correspond to a position returned by ObjectFile.write(ByteBuffer).

Specified by:

reposition in interface ObjectFile

truncate

public void truncate(long size)

Description copied from interface: ObjectFile

Truncate the file

Specified by:

truncate in interface ObjectFile

read

public ByteBuffer read(long id)

Description copied from interface: ObjectFile

Read a buffer at the accessor number.

Specified by:

read in interface ObjectFile

getLabel

public String getLabel()

Description copied from interface: ObjectFile

A label to identify this ObjectFile

Specified by:

getLabel in interface ObjectFile

all

public Iterator<org.apache.jena.atlas.lib.Pair<Long,ByteBuffer>> all()

Description copied from interface: ObjectFile

All the contents as ByteBuffers - debugging aid

Specified by:

all in interface ObjectFile

sync

public void sync()

Specified by:

sync in interface org.apache.jena.atlas.lib.Sync

close

public void close()

Specified by:

close in interface org.apache.jena.atlas.lib.Closeable

length

public long length()

Description copied from interface: ObjectFile

Length, in units used by read/write for ids

Specified by:

length in interface ObjectFile

isEmpty

public boolean isEmpty()

Description copied from interface: ObjectFile

Any objects in this file?

Specified by:

isEmpty in interface ObjectFile