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java.lang.Objectorg.axiondb.BaseSelectable
org.axiondb.functions.BaseFunction
org.axiondb.functions.BaseAggregateFunction
org.axiondb.functions.CountFunction
public class CountFunction
COUNT
: an aggregate function returning the number of rows.
Field Summary |
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Fields inherited from class org.axiondb.BaseSelectable |
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_hash |
Constructor Summary | |
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CountFunction()
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Method Summary | |
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java.lang.Object |
evaluate(RowDecoratorIterator rows)
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DataType |
getDataType()
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ConcreteFunction |
makeNewInstance()
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Methods inherited from class org.axiondb.functions.BaseAggregateFunction |
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acceptable, evaluate, isDistinct, isValid, setDistinct, setDistinct |
Methods inherited from class org.axiondb.functions.BaseFunction |
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addArgument, getArgument, getArgumentCount, setArgument, setVariableContext, toString |
Methods inherited from class org.axiondb.BaseSelectable |
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getAlias, getLabel, getName, setAlias, setName |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface org.axiondb.functions.ConcreteFunction |
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isValid |
Methods inherited from interface org.axiondb.Function |
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addArgument, getAlias, getArgument, getArgumentCount, getName, setAlias, setArgument |
Methods inherited from interface org.axiondb.Selectable |
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evaluate, getLabel, setVariableContext |
Constructor Detail |
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public CountFunction()
Method Detail |
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public ConcreteFunction makeNewInstance()
makeNewInstance
in interface FunctionFactory
public DataType getDataType()
getDataType
in interface Selectable
getDataType
in class BaseFunction
public java.lang.Object evaluate(RowDecoratorIterator rows) throws AxionException
evaluate
in interface AggregateFunction
AxionException
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