Class EventContentFeatureWriter
- Object
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- EventContentFeatureWriter
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- All Implemented Interfaces:
Closeable
,AutoCloseable
,FeatureWriter<SimpleFeatureType,SimpleFeature>
public class EventContentFeatureWriter extends Object implements FeatureWriter<SimpleFeatureType,SimpleFeature>
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, whileEventContentFeatureWriter
is willing to fire the events as needed.Event generation happens in two passes:
- As features are modified events are sent out one at a time
- When commit() or rollback() is called a "batch" event is sent out
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.- Author:
- Jody Garnett (LISASoft)
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Constructor Summary
Constructors Constructor Description EventContentFeatureWriter(ContentFeatureStore store, FeatureWriter<SimpleFeatureType,SimpleFeature> writer)
EventContentFeatureWriter construction.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
close()
Clean up resources associated with this writer.SimpleFeatureType
getFeatureType()
Supplys FeatureTypeFrom readerboolean
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.
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Constructor Detail
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EventContentFeatureWriter
public EventContentFeatureWriter(ContentFeatureStore store, FeatureWriter<SimpleFeatureType,SimpleFeature> writer)
EventContentFeatureWriter construction.
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Method Detail
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getFeatureType
public SimpleFeatureType getFeatureType()
Supplys FeatureTypeFrom reader- Specified by:
getFeatureType
in interfaceFeatureWriter<SimpleFeatureType,SimpleFeature>
- Returns:
- FeatureType this writer has been configured to create.
- See Also:
FeatureWriter.getFeatureType()
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next
public SimpleFeature next() throws IOException
Next Feature from reader or new content.- Specified by:
next
in interfaceFeatureWriter<SimpleFeatureType,SimpleFeature>
- Returns:
- Feature from Query, or newly appended Feature
- Throws:
IOException
- if the writer has been closed or an I/O error occurs reading the nextFeature
.- See Also:
FeatureWriter.next()
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remove
public void remove() throws IOException
Description copied from interface:FeatureWriter
Removes current Feature, must be called before hasNext.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).
- Specified by:
remove
in interfaceFeatureWriter<SimpleFeatureType,SimpleFeature>
- Throws:
IOException
- See Also:
FeatureWriter.remove()
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write
public void write() throws IOException
Writes out the current feature.- Specified by:
write
in interfaceFeatureWriter<SimpleFeatureType,SimpleFeature>
- Throws:
IOException
- See Also:
FeatureWriter.write()
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hasNext
public boolean hasNext() throws IOException
Query for more content.- Specified by:
hasNext
in interfaceFeatureWriter<SimpleFeatureType,SimpleFeature>
- Returns:
true
if an additionalFeature
is available,false
if not.- Throws:
IOException
- if an I/O error occurs.- See Also:
FeatureWriter.hasNext()
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close
public void close() throws IOException
Clean up resources associated with this writer.Diff is not clear()ed as it is assumed that it belongs to a Transaction.State object and may yet be written out.
- Specified by:
close
in interfaceAutoCloseable
- Specified by:
close
in interfaceCloseable
- Specified by:
close
in interfaceFeatureWriter<SimpleFeatureType,SimpleFeature>
- Throws:
IOException
- if there there are problems releasing underlying resources, or possibly if close has been called (up to the implementation).- See Also:
FeatureWriter.close()
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