org.globus.wsrf.utils.io
Class IndexedObjectFileWriter

java.lang.Object
  org.globus.wsrf.utils.io.IndexedObjectFileWriter

public class IndexedObjectFileWriter

extends java.lang.Object

Writes Java objects to an indexed file. The indexing allows for random access to any object in the file. Only Java objects that implement the Serializable interface can be written to the file.

Note: This class is not thread-safe.

See Also:

ObjectOutputStream

Field Summary

private java.io.ByteArrayOutputStream	bos
private java.util.List	index
private long	indexPointer
private java.io.RandomAccessFile	raf

Constructor Summary

IndexedObjectFileWriter(java.lang.String file)

Method Summary

void	close() Writes the object index and closes the file.
int	getIndexSize() Gets the current size of the index (the number of object written so far).
private void	init()
void	writeObject(java.lang.Object obj) Writes the Java object to the file.
private void	writeObjectSub(java.lang.Object obj)

Methods inherited from class java.lang.Object

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

Field Detail

bos

private java.io.ByteArrayOutputStream bos

raf

private java.io.RandomAccessFile raf

indexPointer

private long indexPointer

index

private java.util.List index

Constructor Detail

IndexedObjectFileWriter

public IndexedObjectFileWriter(java.lang.String file)
                        throws java.io.IOException,
                               java.io.FileNotFoundException

Method Detail

init

private void init()
           throws java.io.IOException

Throws:

java.io.IOException

writeObjectSub

private void writeObjectSub(java.lang.Object obj)
                     throws java.io.IOException

Throws:

java.io.IOException

writeObject

public void writeObject(java.lang.Object obj)
                 throws java.io.IOException

Writes the Java object to the file.

Parameters:

obj - object to write.

Throws:

java.io.IOException - if any error occurs.

See Also:

ObjectOutputStream.writeObject(Object)

getIndexSize

public int getIndexSize()

Gets the current size of the index (the number of object written so far).

Returns:

the current size of the index.

close

public void close()
           throws java.io.IOException

Writes the object index and closes the file. This function must be called, otherwise an incomplete file might be created.

Throws:

java.io.IOException - if any error occurs.