Class DoubleSumOperator
- java.lang.Object
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- org.eclipse.viatra.query.runtime.matchers.psystem.aggregations.AbstractMemorylessAggregationOperator<java.lang.Double,java.lang.Double>
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- org.eclipse.viatra.query.runtime.matchers.aggregators.DoubleSumOperator
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- All Implemented Interfaces:
IMultisetAggregationOperator<java.lang.Double,java.lang.Double,java.lang.Double>
public class DoubleSumOperator extends AbstractMemorylessAggregationOperator<java.lang.Double,java.lang.Double>
Incrementally computes the sum of java.lang.Double values- Since:
- 1.4
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Field Summary
Fields Modifier and Type Field Description static DoubleSumOperator
INSTANCE
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Double
aggregateStream(java.util.stream.Stream<java.lang.Double> stream)
Calculates the aggregate results from a given stream of values; all values are considered as insertedjava.lang.Double
createNeutral()
java.lang.String
getName()
A name or identifier of the operator.java.lang.String
getShortDescription()
A textual description of the operator.boolean
isNeutral(java.lang.Double result)
java.lang.Double
update(java.lang.Double oldResult, java.lang.Double updateValue, boolean isInsertion)
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Methods inherited from class org.eclipse.viatra.query.runtime.matchers.psystem.aggregations.AbstractMemorylessAggregationOperator
clone, getAggregate
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.eclipse.viatra.query.runtime.matchers.psystem.aggregations.IMultisetAggregationOperator
combine, contains, prettyPrint
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Field Detail
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INSTANCE
public static final DoubleSumOperator INSTANCE
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Method Detail
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getShortDescription
public java.lang.String getShortDescription()
Description copied from interface:IMultisetAggregationOperator
A textual description of the operator.
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getName
public java.lang.String getName()
Description copied from interface:IMultisetAggregationOperator
A name or identifier of the operator.
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createNeutral
public java.lang.Double createNeutral()
- Returns:
- the neutral element, i.e. the interim result of aggregating an empty multiset.
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isNeutral
public boolean isNeutral(java.lang.Double result)
- Returns:
- true if the interim result is equivalent to the neutral element, as if there are no values in the multiset. Must return true if the multiset is empty.
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update
public java.lang.Double update(java.lang.Double oldResult, java.lang.Double updateValue, boolean isInsertion)
- Returns:
- an updated intermediate result, changed to reflect that a given object was added to / removed from the multiset (as indicated by the parameter isInsertion)
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aggregateStream
public java.lang.Double aggregateStream(java.util.stream.Stream<java.lang.Double> stream)
Description copied from interface:IMultisetAggregationOperator
Calculates the aggregate results from a given stream of values; all values are considered as inserted- Returns:
- the aggregate result, or null if no result can be calculated (e.g. because of an empty stream)
- Since:
- 2.0
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