Package com.github.mizool.core

Class Optionals

java.lang.Object

com.github.mizool.core.Optionals

public final class Optionals
extends Object

Method Summary

Modifier and Type	Method	Description
static <T> Stream<T>	streamPresentValue(@NonNull Optional<T> optional)	Used in streams to flat-map each Optional to its value if present. This method is intended to be used as follows:
static <T> Function<Optional<T>,T>	unwrapRequiredObject(@NonNull Class<T> classOfT)	Used when an object can be reasonably expected to exist, resulting in a DataInconsistencyException if it does not exist.
static <T> T	unwrapRequiredObject(@NonNull Optional<T> wrapped, @NonNull Class<T> classOfT)	Used when an object can be reasonably expected to exist, resulting in a DataInconsistencyException if it does not exist.
static <T> T	unwrapRequiredObject(com.google.common.base.Optional<T> wrapped, @NonNull Class<T> classOfT)	Deprecated. Use unwrapRequiredObject(Optional, Class) instead.
static <T> Function<Optional<T>,T>	unwrapUserMentionedObject(@NonNull Class<T> classOfT)	Used when a user-submitted entity refers to another object, resulting in a UnprocessableEntityException if that object does not exist.
static <T> T	unwrapUserMentionedObject(@NonNull Optional<T> wrapped, @NonNull Class<T> classOfT)	Used when a user-submitted entity refers to another object, resulting in a UnprocessableEntityException if that object does not exist.
static <T> T	unwrapUserMentionedObject(com.google.common.base.Optional<T> wrapped, @NonNull Class<T> classOfT)	Deprecated. Use unwrapUserMentionedObject(Optional, Class) instead.
static <T> Function<Optional<T>,T>	unwrapUserRequestedObject(@NonNull Class<T> classOfT)	Used when a user directly requests an object, resulting in an ObjectNotFoundException if it does not exist.
static <T> T	unwrapUserRequestedObject(@NonNull Optional<T> wrapped, @NonNull Class<T> classOfT)	Used when a user directly requests an object, resulting in an ObjectNotFoundException if it does not exist.
static <T> T	unwrapUserRequestedObject(com.google.common.base.Optional<T> wrapped, @NonNull Class<T> classOfT)	Deprecated. Use unwrapUserRequestedObject(Optional, Class) instead.

Methods inherited from class java.lang.Object

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

Method Detail

unwrapUserRequestedObject

public static <T> T unwrapUserRequestedObject(@NonNull
                                              @NonNull Optional<T> wrapped,
                                              @NonNull
                                              @NonNull Class<T> classOfT)

Used when a user directly requests an object, resulting in an ObjectNotFoundException if it does not exist.

unwrapUserRequestedObject

public static <T> Function<Optional<T>,T> unwrapUserRequestedObject(@NonNull
                                                                          @NonNull Class<T> classOfT)

Used when a user directly requests an object, resulting in an ObjectNotFoundException if it does not exist.

unwrapUserRequestedObject

@Deprecated
public static <T> T unwrapUserRequestedObject(@NonNull
                                              com.google.common.base.Optional<T> wrapped,
                                              @NonNull
                                              @NonNull Class<T> classOfT)

Deprecated.

Use unwrapUserRequestedObject(Optional, Class) instead.

Used when a user directly requests an object, resulting in an ObjectNotFoundException if it does not exist.

unwrapRequiredObject

public static <T> T unwrapRequiredObject(@NonNull
                                         @NonNull Optional<T> wrapped,
                                         @NonNull
                                         @NonNull Class<T> classOfT)

Used when an object can be reasonably expected to exist, resulting in a DataInconsistencyException if it does not exist.

unwrapRequiredObject

public static <T> Function<Optional<T>,T> unwrapRequiredObject(@NonNull
                                                                     @NonNull Class<T> classOfT)

Used when an object can be reasonably expected to exist, resulting in a DataInconsistencyException if it does not exist.

unwrapRequiredObject

@Deprecated
public static <T> T unwrapRequiredObject(@NonNull
                                         com.google.common.base.Optional<T> wrapped,
                                         @NonNull
                                         @NonNull Class<T> classOfT)

Deprecated.

Use unwrapRequiredObject(Optional, Class) instead.

Used when an object can be reasonably expected to exist, resulting in a DataInconsistencyException if it does not exist.

unwrapUserMentionedObject

public static <T> T unwrapUserMentionedObject(@NonNull
                                              @NonNull Optional<T> wrapped,
                                              @NonNull
                                              @NonNull Class<T> classOfT)

Used when a user-submitted entity refers to another object, resulting in a UnprocessableEntityException if that object does not exist.

unwrapUserMentionedObject

public static <T> Function<Optional<T>,T> unwrapUserMentionedObject(@NonNull
                                                                          @NonNull Class<T> classOfT)

Used when a user-submitted entity refers to another object, resulting in a UnprocessableEntityException if that object does not exist.

unwrapUserMentionedObject

@Deprecated
public static <T> T unwrapUserMentionedObject(@NonNull
                                              com.google.common.base.Optional<T> wrapped,
                                              @NonNull
                                              @NonNull Class<T> classOfT)

Deprecated.

Use unwrapUserMentionedObject(Optional, Class) instead.

Used when a user-submitted entity refers to another object, resulting in a UnprocessableEntityException if that object does not exist.

streamPresentValue

public static <T> Stream<T> streamPresentValue(@NonNull
                                               @NonNull Optional<T> optional)

Used in streams to flat-map each Optional to its value if present.

This method is intended to be used as follows:

     .flatMap(Optionals::streamPresentValue)
 

Using this method is equivalent of chaining Optional.isPresent() and Optional.get() like this:

     .filter(Optional::isPresent)
     .map(Optional::get)