org.globus.wsrf.utils.io
Class IndexedObjectFileReader

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

public class IndexedObjectFileReader

extends java.lang.Object

Reads Java objects from an indexed file. The indexing allows for random access to any object in the file.

Note: This class is not thread-safe.

See Also:

ObjectInputStream

Field Summary

private byte[]	buffer
private java.util.List	index
private long	indexPointer
private java.io.RandomAccessFile	raf

Constructor Summary

IndexedObjectFileReader(java.lang.String file)

Method Summary

void	close() Closes the file.
int	getIndexSize() Gets the size of the index (the number of objects in the file).
private void	init()
void	jumpTo(int index) Jumps to the object at the specified position in the file.
java.lang.Object	readObject() Reads a Java object from the file.
private java.lang.Object	readObjectSub()

Methods inherited from class java.lang.Object

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

Field Detail

raf

private java.io.RandomAccessFile raf

buffer

private byte[] buffer

indexPointer

private long indexPointer

index

private java.util.List index

Constructor Detail

IndexedObjectFileReader

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

Method Detail

init

private void init()
           throws java.io.IOException,
                  java.lang.ClassNotFoundException

Throws:

java.io.IOException

java.lang.ClassNotFoundException

readObjectSub

private java.lang.Object readObjectSub()
                                throws java.io.IOException,
                                       java.lang.ClassNotFoundException

Throws:

java.io.IOException

java.lang.ClassNotFoundException

readObject

public java.lang.Object readObject()
                            throws java.io.IOException,
                                   java.lang.ClassNotFoundException

Reads a Java object from the file.

Returns:

the object read from the file.

Throws:

java.io.IOException - if any error occurs.

java.lang.ClassNotFoundException - if cannot find the class for the object in the file.

java.io.EOFException - if end of the file is reached.

See Also:

ObjectInputStream.readObject()

getIndexSize

public int getIndexSize()

Gets the size of the index (the number of objects in the file).

Returns:

the size of the index.

jumpTo

public void jumpTo(int index)
            throws java.io.IOException

Jumps to the object at the specified position in the file.

Parameters:

index - the position to jump to.

Throws:

java.io.IOException - if the position specified is invalid or any other error occurs.

close

public void close()
           throws java.io.IOException

Closes the file.

Throws:

java.io.IOException - if any error occurs.