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

Class ChainedObjectAccessor<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.ChainedObjectAccessor<T,R>

Type Parameters:

T - Input parameter type

R - Return parameter type

All Implemented Interfaces:

Function<T,R>, Expression<T,R>, ExpressionNode<T,R>

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

Chained object accessor retrieves values from expressions having form parent.child.grandchild

Field Summary

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

_metadata

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
R	apply(T value)	Evaluates expression using parameters and the value supplied

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

ChainedObjectAccessor

public ChainedObjectAccessor(String alias,
                             ExpressionNode<T,R> first,
                             List<ExpressionNode<R,?>> args)

Constructor initializes children expression list

Parameters:

alias - Expression alias

first - First argument in the chain

args - Subsequent arguments in the chain

Method Detail

apply

public R apply(T value)

Evaluates expression using parameters and the value supplied

Parameters:

value - Object to handle

Returns:

Evaluation result