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ObjectEventContentFeatureWriter
public class EventContentFeatureWriter
FeatureWriter wrapper that issues events modifications as required.
It is the responsibility of a FeatureStore to issue events to interested parties as content is modified. The ContentState
keeps track of
the listeners, while EventContentFeatureWriter
is willing to fire the events as needed.
Event generation happens in two passes:
BatchFeatureEvent
maintains a map of BEFORE/AFTER values allowing any interested party to update their seleciton.
Please note that if you are using DiffFeatureWriter
it sends out events on its own.
Constructor Summary | |
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EventContentFeatureWriter(ContentFeatureStore store,
FeatureWriter<SimpleFeatureType,SimpleFeature> writer)
EventContentFeatureWriter construction. |
Method Summary | |
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void |
close()
Clean up resources associated with this writer. |
SimpleFeatureType |
getFeatureType()
Supplys FeatureTypeFrom reader |
boolean |
hasNext()
Query for more content. |
SimpleFeature |
next()
Next Feature from reader or new content. |
void |
remove()
Removes current Feature, must be called before hasNext. |
void |
write()
Writes out the current feature. |
Methods inherited from class Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public EventContentFeatureWriter(ContentFeatureStore store, FeatureWriter<SimpleFeatureType,SimpleFeature> writer)
reader
- diff
- filter
- Method Detail |
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public SimpleFeatureType getFeatureType()
getFeatureType
in interface FeatureWriter<SimpleFeatureType,SimpleFeature>
FeatureWriter.getFeatureType()
public SimpleFeature next() throws IOException
next
in interface FeatureWriter<SimpleFeatureType,SimpleFeature>
IOException
- DOCUMENT ME!FeatureWriter.next()
public void remove() throws IOException
FeatureWriter
FeatureWriters will need to allow all FeatureSources of the same
typeName to issue a FeatureEvent event of type
FeatureEvent.FEATURES_REMOVED
when this method is called.
If this FeatureWriter is opperating against a Transaction FEATURES_REMOVED events should only be sent to FeatureSources operating on the same Transaction. When Transaction commit() is called other FeatureSources will be informed of the modifications.
When the current Feature has been provided as new content, this method "cancels" the add opperation (and notification needed).
remove
in interface FeatureWriter<SimpleFeatureType,SimpleFeature>
IOException
- DOCUMENT ME!FeatureWriter.remove()
public void write() throws IOException
write
in interface FeatureWriter<SimpleFeatureType,SimpleFeature>
IOException
FeatureWriter.write()
public boolean hasNext() throws IOException
hasNext
in interface FeatureWriter<SimpleFeatureType,SimpleFeature>
true
if an additional Feature
is
available.
IOException
- DOCUMENT ME!FeatureWriter.hasNext()
public void close() throws IOException
Diff is not clear()ed as it is assumed that it belongs to a Transaction.State object and may yet be written out.
close
in interface Closeable
close
in interface FeatureWriter<SimpleFeatureType,SimpleFeature>
IOException
- if there there are problems releasing underlying resources, or
possibly if close has been called (up to the implementation).FeatureWriter.close()
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