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

Class CurrentTimestampExpression<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,Instant>

org.apache.qpid.server.query.engine.parsing.expression.function.datetime.CurrentTimestampExpression<T>

Type Parameters:

T - Input parameter type

All Implemented Interfaces:

Function<T,Instant>, Expression<T,Instant>, ExpressionNode<T,Instant>

public class CurrentTimestampExpression<T>
extends AbstractFunctionExpression<T,Instant>

The CURRENT_TIMESTAMP() function returns current date and time.

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

Method Summary

Modifier and Type	Method	Description
Instant	apply(T value)	Returns current datetime

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

CurrentTimestampExpression

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

Constructor initializes children expression list

Parameters:

alias - Expression alias

args - List of children expressions

Method Detail

apply

public Instant apply(T value)

Returns current datetime

Parameters:

value - Object to handle

Returns:

Current datetime