com.dataiku.scoring

Class Try<T>

java.lang.Object

com.dataiku.scoring.Try<T>

All Implemented Interfaces:

java.io.Serializable

public class Try<T>
extends java.lang.Object
implements java.io.Serializable

A wrapper over computations which may fail.

A try can either be a success of the associated type, or a failure containing an error message.

Try 's allow to chain expressions and propagate errors in a safe and hard-typed manner, rather than throwing exceptions. They furthermore force the user to handle the exception explicitly rather than to rely on chaining throws statements.

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
static <T> Try<T>	failure(java.lang.String e) Constructs a failure with the corresponding error message.
T	get() Returns the result of the corresponding computation if and only if it succeeded.
java.lang.String	getMessage() Returns the error message if the computation failed.
boolean	isError() Returns true if the associated computation resulted in an error.
boolean	isSuccess() Returns true if the associated computation successfully completed.
T	orElse(T t) Returns the result of the computation if it was a success, or the provided value instead.
static <T> Try<T>	success(T t) Constructs a success with the corresponding given value.

Methods inherited from class java.lang.Object

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

Method Detail

isError

public boolean isError()

Returns true if the associated computation resulted in an error.

isSuccess

public boolean isSuccess()

Returns true if the associated computation successfully completed.

get

public T get()

Returns the result of the corresponding computation if and only if it succeeded. Should the Try be a failure, an exception will be thrown.

getMessage

public java.lang.String getMessage()

Returns the error message if the computation failed. If it was a success, null is returned instead.

orElse

public T orElse(T t)

Returns the result of the computation if it was a success, or the provided value instead.

success

public static <T> Try<T> success(T t)

Constructs a success with the corresponding given value.

failure

public static <T> Try<T> failure(java.lang.String e)

Constructs a failure with the corresponding error message. The message should be as informative as possible as to how the error occurred, and if applicable, how it may be solved. NOTE : the error message may NOT be null. This is enforced so as to always have informative error messages.