com.imagero.uio.blob
Class Blob

java.lang.Object
  com.imagero.uio.blob.Blob

Direct Known Subclasses:

Blob.BaBlob, Blob.IaBlob, Blob.RoBlob

public abstract class Blob

extends java.lang.Object

Blob - Object which encapsulates (possible deferred) data which may come from different sources.

Nested Class Summary

static class	Blob.BaBlob
static class	Blob.IaBlob
static class	Blob.RoBlob

Constructor Summary

Blob()

Method Summary

abstract void	clear() release reloadable resources
protected abstract long	computeLength()
abstract int	get(long start, byte[] dest) retrieve data from this Blob
abstract byte[]	get(long start, int length) retrieve data from this Blob
java.io.InputStream	getInputStream()
long	getLength()
java.lang.Object	getProperty(java.lang.Object key)
protected boolean	lengthKnown()
abstract void	set(long start, byte[] data) set data (work only if writable returns true)
void	setProperty(java.lang.Object key, java.lang.Object property)
abstract boolean	writable() determine if this Blob is writable and method set(long, byte[]) can be used to change content of this Blob

Methods inherited from class java.lang.Object

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

Constructor Detail

Blob

public Blob()

Method Detail

get

public abstract byte[] get(long start,
                           int length)
                    throws java.io.IOException

retrieve data from this Blob

Parameters:

start - start offset

length - how much bytes to get

Returns:

byte array with data

Throws:

java.io.IOException

get

public abstract int get(long start,
                        byte[] dest)
                 throws java.io.IOException

retrieve data from this Blob

Parameters:

start - start offset

dest - where to copy data

Returns:

how much byte were copied

Throws:

java.io.IOException

writable

public abstract boolean writable()

determine if this Blob is writable and method set(long, byte[]) can be used to change content of this Blob

Returns:

true if Blob is writable

set

public abstract void set(long start,
                         byte[] data)
                  throws java.io.IOException

set data (work only if writable returns true)

Parameters:

start - start in destination

data - new data

Throws:

java.io.IOException

clear

public abstract void clear()

release reloadable resources

lengthKnown

protected boolean lengthKnown()

computeLength

protected abstract long computeLength()
                               throws java.io.IOException

Throws:

java.io.IOException

getLength

public long getLength()

getInputStream

public java.io.InputStream getInputStream()
                                   throws java.io.IOException

Throws:

java.io.IOException

getProperty

public java.lang.Object getProperty(java.lang.Object key)

setProperty

public void setProperty(java.lang.Object key,
                        java.lang.Object property)