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

Class DelegatingCollectionAccessorExpression<T,R,INDEX,COLLECTION extends java.util.Collection<R>,MAP extends java.util.Map<java.lang.String,R>>

java.lang.Object

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

org.apache.qpid.server.query.engine.parsing.expression.accessor.DelegatingCollectionAccessorExpression<T,R,INDEX,COLLECTION,MAP>

Type Parameters:

T - Input type parameter

R - Return type parameter

INDEX - Index type

COLLECTION - Collection type

MAP - Map type

All Implemented Interfaces:

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

public class DelegatingCollectionAccessorExpression<T,R,INDEX,COLLECTION extends java.util.Collection<R>,MAP extends java.util.Map<java.lang.String,R>>
extends AbstractExpressionNode<T,R>

Delegating collection accessor retrieves values either from indexed collections or from maps

Field Summary

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

_metadata

Constructor Summary

Constructors

Constructor	Description
DelegatingCollectionAccessorExpression(java.lang.String alias, java.lang.String property, Expression<T,INDEX> index)	Constructor stores field values

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

DelegatingCollectionAccessorExpression

public DelegatingCollectionAccessorExpression(java.lang.String alias,
                                              java.lang.String property,
                                              Expression<T,INDEX> index)

Constructor stores field values

Parameters:

alias - Expression alias

property - Property name

index - Property index

Method Detail

apply

public R apply(T value)

Evaluates expression using parameters and the value supplied

Parameters:

value - Object to handle

Returns:

Evaluation result