org.neo4j.helpers.collection

Class Visitor.SafeGenerics

java.lang.Object

org.neo4j.helpers.collection.Visitor.SafeGenerics

Enclosing interface:

Visitor<E,FAILURE extends Exception>

public static final class Visitor.SafeGenerics
extends Object

Method Summary

Modifier and Type	Method and Description
static <T,F extends Exception> Visitor<? super T,? extends F>	castOrNull(Class<T> eType, Class<F> fType, Object visitor) Useful for determining "is this an object that can visit the things I can provide?" Checks if the passed in object is a Visitor and if the objects it can visit is compatible (super type of) with the provided type.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

castOrNull

public static <T,F extends Exception> Visitor<? super T,? extends F> castOrNull(Class<T> eType,
                                                                                Class<F> fType,
                                                                                Object visitor)

Useful for determining "is this an object that can visit the things I can provide?" Checks if the passed in object is a Visitor and if the objects it can visit is compatible (super type of) with the provided type. Returns the visitor cast to compatible type parameters. If the passed in object is not an instance of Visitor, or if it is a Visitor but one that visits another type of object, this method returns null.

Type Parameters:

T - type of the elements

F - type of the exception

Parameters:

eType - element type of the visitor

fType - failure type of the visitor

visitor - the visitor

Returns:

the visitor cast to compatible type parameters or null