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

Class CollectionObjectAccessor<R>

java.lang.Object

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

org.apache.qpid.server.query.engine.parsing.expression.accessor.CollectionObjectAccessor<R>

Type Parameters:

R - Return parameter type

All Implemented Interfaces:

Function<Collection<R>,R>, Expression<Collection<R>,R>, ExpressionNode<Collection<R>,R>

public class CollectionObjectAccessor<R>
extends AbstractExpressionNode<Collection<R>,R>

Collection object accessor retrieves values from a collection

Field Summary

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

_metadata

Constructor Summary

Constructors

Constructor	Description
CollectionObjectAccessor(Integer index)	Constructor stores index value

Method Summary

Modifier and Type	Method	Description
R	apply(Collection<R> items)	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

CollectionObjectAccessor

public CollectionObjectAccessor(Integer index)

Constructor stores index value

Parameters:

index - Collection index

Method Detail

apply

public R apply(Collection<R> items)

Evaluates expression using parameters and the value supplied

Parameters:

items - Collection to handle

Returns:

Evaluation result