Package uk.ac.starlink.ttools.task
Interface Aggregator
public interface Aggregator
Defines an aggregation operation.
An instance of this class can take multiple values associated with a
given metadata item, and collapse them down to a single value.
- Since:
- 16 Nov 2022
- Author:
- Mark Taylor
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Nested Class Summary
Nested ClassesModifier and TypeInterfaceDescriptionstatic interface
Can accumulate multiple data items of a consistent type and yield an aggregate value corresponding to the set.static interface
Object that can manage aggregation for a given type of input data. -
Method Summary
Modifier and TypeMethodDescriptioncreateAggregation
(uk.ac.starlink.table.ValueInfo info) Creates an object that can manage aggregation for data described by given metadata.Returns a short textual description for this aggregator.getName()
Returns the name of this aggregator.
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Method Details
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getName
String getName()Returns the name of this aggregator.- Returns:
- user-readable short name
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getDescription
String getDescription()Returns a short textual description for this aggregator.- Returns:
- plain text description
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createAggregation
Creates an object that can manage aggregation for data described by given metadata. If the metadata describes data that is not suitable for use by this object, null is returned.- Parameters:
info
- input data description- Returns:
- new aggregation, or null
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