org.apache.metamodel.query

Class CountAggregateFunction

java.lang.Object

org.apache.metamodel.query.DefaultAggregateFunction<Long>

org.apache.metamodel.query.CountAggregateFunction

All Implemented Interfaces:

Serializable, AggregateFunction, FunctionType

public class CountAggregateFunction
extends DefaultAggregateFunction<Long>

See Also:

Serialized Form

Field Summary

Fields inherited from interface org.apache.metamodel.query.FunctionType

AVG, COUNT, FIRST, JAVA_SUBSTRING, LAST, MAP_VALUE, MAX, MIN, RANDOM, SUBSTRING, SUM, TO_BOOLEAN, TO_DATE, TO_NUMBER, TO_STRING

Constructor Summary

Constructors

Constructor and Description
CountAggregateFunction()

Method Summary

Modifier and Type	Method and Description
AggregateBuilder<Long>	createAggregateBuilder() Creates a specific aggregate builder.
ColumnType	getExpectedColumnType(ColumnType type) Returns the function ColumnType.
String	getFunctionName()

Methods inherited from class org.apache.metamodel.query.DefaultAggregateFunction

evaluate, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

CountAggregateFunction

public CountAggregateFunction()

Method Detail

getFunctionName

public String getFunctionName()

createAggregateBuilder

public AggregateBuilder<Long> createAggregateBuilder()

Description copied from interface: AggregateFunction

Creates a specific aggregate builder.

Returns:

an AggregateBuilder instance

getExpectedColumnType

public ColumnType getExpectedColumnType(ColumnType type)

Description copied from interface: AggregateFunction

Returns the function ColumnType.

Specified by:

getExpectedColumnType in interface AggregateFunction

Specified by:

getExpectedColumnType in interface FunctionType

Overrides:

getExpectedColumnType in class DefaultAggregateFunction<Long>

Returns:

the ColumnType