Package org.apache.qpid.server.query.engine.parsing.expression.function.numeric

Class RoundExpression<T>

java.lang.Object

org.apache.qpid.server.query.engine.parsing.expression.AbstractExpressionNode<T,R>

org.apache.qpid.server.query.engine.parsing.expression.function.AbstractFunctionExpression<T,Number>

org.apache.qpid.server.query.engine.parsing.expression.function.numeric.RoundExpression<T>

Type Parameters:

T - Input parameter type

All Implemented Interfaces:

Function<T,Number>, Expression<T,Number>, ExpressionNode<T,Number>

public class RoundExpression<T>
extends AbstractFunctionExpression<T,Number>

ROUND takes a numeric parameter and rounds it to the specified number of decimal places.

Field Summary

Fields inherited from class org.apache.qpid.server.query.engine.parsing.expression.function.AbstractFunctionExpression

_functionName

Fields inherited from class org.apache.qpid.server.query.engine.parsing.expression.AbstractExpressionNode

_metadata

Constructor Summary

Constructors

Constructor	Description
RoundExpression(String alias, List<ExpressionNode<T,?>> args)	Constructor initializes children expression list

Method Summary

Modifier and Type	Method	Description
Number	apply(T value)	Performs round operation using parameters and the value supplied

Methods inherited from class org.apache.qpid.server.query.engine.parsing.expression.function.AbstractFunctionExpression

evaluateChild, getFunctionName, getOptionalConstantParameter, getOptionalParameter, getRequiredParameter

Methods inherited from class org.apache.qpid.server.query.engine.parsing.expression.AbstractExpressionNode

containsAggregation, ctx, evaluateChild, getAggregations, getAlias, getChild, getChildren, getParent, isAccessor, isInstantlyEvaluable, setAlias, setParent, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.qpid.server.query.engine.parsing.expression.Expression

andThen

Methods inherited from interface java.util.function.Function

andThen, compose

Constructor Detail

RoundExpression

public RoundExpression(String alias,
                       List<ExpressionNode<T,?>> args)

Constructor initializes children expression list

Parameters:

alias - Expression alias

args - List of children expressions

Method Detail

apply

public Number apply(T value)

Performs round operation using parameters and the value supplied

Parameters:

value - Object to handle

Returns:

Resulting number