org.dmfs.optional.decorators

Class DelegatingOptional<T>

java.lang.Object

org.dmfs.optional.decorators.DelegatingOptional<T>

All Implemented Interfaces:

Optional<T>

Direct Known Subclasses:

FirstPresent, MapCollapsed, NextPresent

Deprecated.

in favour of DelegatingOptional.

@Deprecated
public abstract class DelegatingOptional<T>
extends java.lang.Object
implements Optional<T>

An abstract Optional which delegates all method calls to another given Optional.

This class is abstract and is meant to be a convenient way of composing Optionals despite the lack of native support for the decoration pattern in Java.

Constructor Summary

Constructors

Constructor and Description
DelegatingOptional(Optional<T> delegate) Deprecated.

Method Summary

Modifier and Type	Method and Description
boolean	isPresent() Deprecated. Returns whether the optional value is present.
T	value() Deprecated. Returns the optional value.
T	value(T defaultValue) Deprecated. Returns the optional value or the given default value if the optional value is not present.

Methods inherited from class java.lang.Object

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

Constructor Detail

DelegatingOptional

public DelegatingOptional(Optional<T> delegate)

Deprecated.

Method Detail

isPresent

public final boolean isPresent()

Deprecated.

Description copied from interface: Optional

Returns whether the optional value is present.

Specified by:

isPresent in interface Optional<T>

Returns:

true if the value is present, false otherwise.

value

public final T value(T defaultValue)

Deprecated.

Description copied from interface: Optional

Returns the optional value or the given default value if the optional value is not present.

Parameters:

defaultValue - The value to return if the optional value is not present.

Returns:

The optional value or the default value.

value

public final T value()
              throws java.util.NoSuchElementException

Deprecated.

Description copied from interface: Optional

Returns the optional value.

Specified by:

value in interface Optional<T>

Returns:

The value.

Throws:

java.util.NoSuchElementException - if the optional value is not present.