Package com.levigo.jadice.server.html.worker.request

Class HierarchyResolver

java.lang.Object

com.levigo.jadice.server.html.worker.request.HierarchyResolver

All Implemented Interfaces:

StreamResolver, Serializable

public class HierarchyResolver
extends Object
implements StreamResolver, Serializable

A StreamResolver which searches the stream hierarchy upwards for a resolver which knows about streams it is asked for.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
HierarchyResolver(StreamDescriptor sd)

Method Summary

Modifier and Type	Method	Description
Stream	getStream(String cid)	Retrieve the corresponding Stream by its stream identifier - here the cid (Content-ID).
List<Stream>	getUnusedStreams()	Retrieve all streams that were not used so far.
boolean	markUnused(String cid)	Mark a Stream as being unused and reset it to an unused state.

Methods inherited from class java.lang.Object

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

Constructor Detail

HierarchyResolver

public HierarchyResolver(StreamDescriptor sd)

Method Detail

getStream

public Stream getStream(String cid)
                 throws IOException

Description copied from interface: StreamResolver

Retrieve the corresponding Stream by its stream identifier - here the cid (Content-ID).

Specified by:

getStream in interface StreamResolver

Parameters:

cid - the Content-ID that identifies the Stream that shall be retrieved.

Returns:

the correspondig Stream.

Throws:

IOException - if reading a stream failed.

getUnusedStreams

public List<Stream> getUnusedStreams()
                              throws IOException

Description copied from interface: StreamResolver

Retrieve all streams that were not used so far. Per definition, these streams are regarded when this method was called

Specified by:

getUnusedStreams in interface StreamResolver

Returns:

unused streams

Throws:

IOException - in case of I/O errors

markUnused

public boolean markUnused(String cid)

Description copied from interface: StreamResolver

Mark a Stream as being unused and reset it to an unused state. This method can only be used once to add the Stream to the unused streams collection. In subsequent invocations it will only return if marking the Stream as unused succeeded once but will not add it to the collection of unused streams again.

Specified by:

markUnused in interface StreamResolver

Parameters:

cid - the Content-ID that identifies the Stream that shall be retrieved.

Returns:

true if resetting the Stream to an unused state succeeded otherwise false.