Package org.teiid.query.function.aggregate

Class FirstLastValue

java.lang.Object

org.teiid.query.function.aggregate.AggregateFunction

org.teiid.query.function.aggregate.SingleArgumentAggregateFunction

org.teiid.query.function.aggregate.FirstLastValue

public class FirstLastValue
extends SingleArgumentAggregateFunction

Just a simple First/Last_value() implementation

Field Summary

Fields inherited from class org.teiid.query.function.aggregate.AggregateFunction

argIndexes

Constructor Summary

Constructors

Constructor	Description
FirstLastValue(Class<?> type, boolean first)

Method Summary

Modifier and Type	Method	Description
void	addInputDirect(Object input, List<?> tuple, CommandContext commandContext)
Object	getResult(CommandContext commandContext)	Called after all values have been processed to get the result.
void	getState(List<Object> state)
List<? extends Class<?>>	getStateTypes()
void	reset()	Called to reset the state of the function.
boolean	respectsNull()
int	setState(List<?> state, int index)

Methods inherited from class org.teiid.query.function.aggregate.SingleArgumentAggregateFunction

addInputDirect, initialize, initialize

Methods inherited from class org.teiid.query.function.aggregate.AggregateFunction

addInput, filter, getArgIndexes, getOutputType, setArgIndexes, setConditionIndex

Methods inherited from class java.lang.Object

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

Constructor Detail

FirstLastValue

public FirstLastValue(Class<?> type,
                      boolean first)

Method Detail

reset

public void reset()

Description copied from class: AggregateFunction

Called to reset the state of the function.

Specified by:

reset in class AggregateFunction

addInputDirect

public void addInputDirect(Object input,
                           List<?> tuple,
                           CommandContext commandContext)
                    throws TeiidProcessingException,
                           TeiidComponentException

Specified by:

addInputDirect in class SingleArgumentAggregateFunction

Throws:

TeiidProcessingException

TeiidComponentException

getResult

public Object getResult(CommandContext commandContext)

Description copied from class: AggregateFunction

Called after all values have been processed to get the result.

Specified by:

getResult in class AggregateFunction

Returns:

Result value

See Also:

AggregateFunction.getResult(CommandContext)

getState

public void getState(List<Object> state)

Overrides:

getState in class AggregateFunction

setState

public int setState(List<?> state,
                    int index)

Overrides:

setState in class AggregateFunction

getStateTypes

public List<? extends Class<?>> getStateTypes()

Overrides:

getStateTypes in class AggregateFunction

respectsNull

public boolean respectsNull()

Overrides:

respectsNull in class AggregateFunction