Package org.apache.qpid.server.query.engine.parsing.expression.accessor

Class DelegatingObjectAccessor<T,R>

java.lang.Object

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

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

Type Parameters:

T - Input parameter type

R - Output parameter type

All Implemented Interfaces:

java.util.function.Function<T,R>, Expression<T,R>, ExpressionNode<T,R>

public class DelegatingObjectAccessor<T,R>
extends AbstractExpressionNode<T,R>

Delegating object accessor delegates value retrieval to other accessor types

Field Summary

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

_metadata

Constructor Summary

Constructors

Constructor	Description
DelegatingObjectAccessor(java.lang.String alias, java.lang.String property)	Constructor stores alias and object property name

Method Summary

Modifier and Type	Method	Description
R	apply(T value)	Evaluates expression using parameters and the value supplied
java.lang.String	getAlias()	Returns expression alias
java.lang.String	toString()

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

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

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

DelegatingObjectAccessor

public DelegatingObjectAccessor(java.lang.String alias,
                                java.lang.String property)

Constructor stores alias and object property name

Parameters:

alias - Expression alias

property - Object property name

Method Detail

apply

public R apply(T value)

Evaluates expression using parameters and the value supplied

Parameters:

value - Object to handle

Returns:

Evaluation result

getAlias

public java.lang.String getAlias()

Description copied from class: AbstractExpressionNode

Returns expression alias

Specified by:

getAlias in interface ExpressionNode<T,R>

Overrides:

getAlias in class AbstractExpressionNode<T,R>

Returns:

Expression alias

toString

public java.lang.String toString()

Overrides:

toString in class AbstractExpressionNode<T,R>