public class AggregatorFirstEverFilter extends AggregatorFirstEver
firstValue, isSet
Constructor and Description |
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AggregatorFirstEverFilter() |
Modifier and Type | Method and Description |
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void |
enter(Object parameters)
Apply the value as entering aggregation (entering window).
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clear, getFirstValue, getValue, isSet, leave, setFirstValue, setSet
public void enter(Object parameters)
AggregationMethod
The value can be null since 'null' values may be counted as unique separate values.
enter
in interface AggregationMethod
enter
in class AggregatorFirstEver
parameters
- to add to aggregate