Module hw06

Package provided.utils.loader.impl

Class ObjectLoader<ReturnT>

java.lang.Object

provided.utils.loader.impl.AObjectLoader<ReturnT>

provided.utils.loader.impl.ObjectLoader<ReturnT>

Type Parameters:

ReturnT - The type of object to be created.

All Implemented Interfaces:

IObjectLoader<ReturnT>

public class ObjectLoader<ReturnT>
extends AObjectLoader<ReturnT>

Factory that dynamically class loads and instantiates an object of type ReturnT This is a non-recursive object loader that should be used when the fully qualified name of the desired class can be determined BEFORE the object loader is invoked.

Author:

Stephen Wong

Field Summary

Fields

Modifier and Type	Field	Description
private Function<Object[],ReturnT>	errorFac	Lambda function to return an error object of type ReturnT

Fields inherited from class provided.utils.loader.impl.AObjectLoader

logger

Constructor Summary

Constructors

Constructor	Description
ObjectLoader(Function<Object[],ReturnT> errorFac)	Constructor for the class.

Method Summary

Modifier and Type	Method	Description
protected ReturnT	errorHandler(Exception ex, String className, Object... args)	Prints the given Exception to stderr and then invokes the stored errorFac to generate an error object.

Methods inherited from class provided.utils.loader.impl.AObjectLoader

loadInstance

Methods inherited from class java.lang.Object

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

Field Details

errorFac

private Function<Object[],ReturnT> errorFac

Lambda function to return an error object of type ReturnT

Constructor Details

ObjectLoader

public ObjectLoader(Function<Object[],ReturnT> errorFac)

Constructor for the class. The given errorFac is used to generate instances when the loadInstance() method is otherwise unable to do so because of a processing error.

Parameters:

errorFac - A factory method that takes the same array of input parameters that loadInstance() takes and returns an instance of ReturnT.

Method Details

errorHandler

protected ReturnT errorHandler(Exception ex,
 String className,
 Object... args)

Prints the given Exception to stderr and then invokes the stored errorFac to generate an error object.

Specified by:

errorHandler in class AObjectLoader<ReturnT>

Parameters:

ex - The Exception that was generated

className - The fully qualified name of the class that was attempted to be loaded

args - The constructor parameters for the given class name.

Returns:

An "error" object