org.teiid.query.function.aggregate

Class Avg

java.lang.Object

org.teiid.query.function.aggregate.AggregateFunction

org.teiid.query.function.aggregate.SingleArgumentAggregateFunction

org.teiid.query.function.aggregate.Sum

org.teiid.query.function.aggregate.Avg

public class Avg
extends Sum

Accumulates (per tuple) and calculates the average of the values of a column. The type of the result varies depending on the type of the input AggregateSymbol - the type will not be an integral type but will always be some kind of decimal type.

Field Summary

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

accumulatorType, BIG_DECIMAL, BIG_INTEGER, DOUBLE, LONG

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

argIndexes

Constructor Summary

Constructors

Constructor and Description
Avg()

Method Summary

Modifier and Type	Method and 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	initialize(Class<?> dataType, Class<?> inputType)
void	reset() Called to reset the state of the function.
int	setState(List<?> state, int index)

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

getAccumulatorType

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

addInputDirect, initialize

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

addInput, filter, getArgIndexes, getOutputType, respectsNull, setArgIndexes, setConditionIndex

Methods inherited from class java.lang.Object

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

Constructor Detail

Avg

public Avg()

Method Detail

initialize

public void initialize(Class<?> dataType,
                       Class<?> inputType)

Overrides:

initialize in class Sum

See Also:

org.teiid.query.function.aggregate.AggregateFunction#initialize(String, Class)

reset

public void reset()

Description copied from class: AggregateFunction

Called to reset the state of the function.

Overrides:

reset in class Sum

addInputDirect

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

Overrides:

addInputDirect in class Sum

Throws:

FunctionExecutionException

ExpressionEvaluationException

TeiidComponentException

See Also:

org.teiid.query.function.aggregate.AggregateFunction#addInputDirect(List, CommandContext, CommandContext)

getResult

public Object getResult(CommandContext commandContext)
                 throws FunctionExecutionException,
                        ExpressionEvaluationException,
                        TeiidComponentException

Description copied from class: AggregateFunction

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

Overrides:

getResult in class Sum

Returns:

Result value

Throws:

FunctionExecutionException

ExpressionEvaluationException

TeiidComponentException

See Also:

AggregateFunction.getResult(CommandContext)

getStateTypes

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

Overrides:

getStateTypes in class Sum

getState

public void getState(List<Object> state)

Overrides:

getState in class Sum

setState

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

Overrides:

setState in class Sum