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java.lang.Objectcom.espertech.esper.epl.agg.aggregator.AggregatorFirstEver
com.espertech.esper.epl.agg.aggregator.AggregatorFirstEverFilter
public class AggregatorFirstEverFilter
Aggregator for the very first value.
Field Summary |
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Fields inherited from class com.espertech.esper.epl.agg.aggregator.AggregatorFirstEver |
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firstValue, isSet |
Constructor Summary | |
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AggregatorFirstEverFilter()
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Method Summary | |
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void |
enter(java.lang.Object parameters)
Apply the value as entering aggregation (entering window). |
Methods inherited from class com.espertech.esper.epl.agg.aggregator.AggregatorFirstEver |
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clear, getFirstValue, getValue, isSet, leave, setFirstValue, setSet |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public AggregatorFirstEverFilter()
Method Detail |
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public void enter(java.lang.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
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