org.gcube.data.tmf.impl
Class AbstractWriter

java.lang.Object
  org.gcube.data.tmf.impl.AbstractWriter

All Implemented Interfaces:

Serializable, SourceWriter

public abstract class AbstractWriter
extends Object
implements SourceWriter

Partial implementation of SourceWriter.

Plugins that extend this class need only to implement SourceWriter.add(Tree) and SourceWriter.update(Tree), as the implementation of the stream-based methods can be derived from these methods.

Note that the derived implementations are naive and highly inefficient if the data source supports more direct implementations. In this case, plugins can override derived implementations selectively.

Author:

Fabio Simeoni

See Also:

SourceWriter, Serialized Form

Constructor Summary

AbstractWriter()

Method Summary

org.gcube.data.streams.Stream<org.gcube.data.trees.data.Tree>	add(org.gcube.data.streams.Stream<org.gcube.data.trees.data.Tree> stream) Default implementation of SourceWriter.add(Stream) based on repeated delegation to SourceWriter.add(Tree).
org.gcube.data.streams.Stream<org.gcube.data.trees.data.Tree>	update(org.gcube.data.streams.Stream<org.gcube.data.trees.data.Tree> deltaStream) Default implementation of SourceWriter.update(Stream) based on repeated delegation to SourceWriter.update(Tree).

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.gcube.data.tmf.api.SourceWriter

add, update

Constructor Detail

AbstractWriter

public AbstractWriter()

Method Detail

add

public org.gcube.data.streams.Stream<org.gcube.data.trees.data.Tree> add(org.gcube.data.streams.Stream<org.gcube.data.trees.data.Tree> stream)
                                                                  throws UnsupportedOperationException,
                                                                         Exception

Default implementation of SourceWriter.add(Stream) based on repeated delegation to SourceWriter.add(Tree).

It should be inherited only if the source does not support stream-based additions.

Specified by:

add in interface SourceWriter

Parameters:

stream - the stream of trees

Returns:

a stream with the outcomes of adding the input trees. Successful outcomes are trees; if not otherwise documented for this plugin, these are the input trees with modifications made at the point of addition if any. Unsuccessful outcomes are failures and will be raised as the stream is consumed.

Throws:

UnsupportedOperationException - if the data source does not support this operation

UnsupportedRequestException - if the data source does not support this request

Exception - if the operation fails as a whole for an unexpected error

See Also:

SourceWriter.add(Stream)

update

public org.gcube.data.streams.Stream<org.gcube.data.trees.data.Tree> update(org.gcube.data.streams.Stream<org.gcube.data.trees.data.Tree> deltaStream)
                                                                     throws UnsupportedOperationException,
                                                                            Exception

Default implementation of SourceWriter.update(Stream) based on repeated delegation to SourceWriter.update(Tree).

It should be inherited only if the source does not support stream-based updates.

Specified by:

update in interface SourceWriter

Parameters:

deltaStream - the delta trees

Returns:

a stream with the outcomes of updating the input trees. Successful outcomes are trees; if not otherwise documented for this plugin, these are the input trees with modifications made at the point of addition if any. Unsuccessful outcomes are failures and will be raised as the stream is consumed.

Throws:

UnsupportedOperationException - if the data source does not support this operation

UnsupportedRequestException - if the data source does not support this request

Exception - if the operation fails as a whole for an expected error

See Also:

SourceWriter.update(Stream)