com.asakusafw.dmdl.directio.util

Class Value<T>

java.lang.Object

com.asakusafw.dmdl.directio.util.Value<T>

Type Parameters:

T - the value type

public final class Value<T>
extends Object

Represents a value.

Since:

0.9.1

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
AstAttributeElement	getDeclaration() Returns the declaration.
T	getEntity() Returns the entity.
int	hashCode()
void	ifPresent(Consumer<T> action) Accepts the entity only if this value is present.
boolean	isDefined() Returns whether or not this value is explicitly defined.
boolean	isPresent() Returns whether or not this value is present.
static <T> Value<T>	of(AstAttributeElement declaration, T entity) Returns a new value.
Value<T>	orDefault(Value<T> defaultValue) Returns this if defined, or the default value.
T	orElse(T defaultValue) Returns this if defined, or the default value.
String	toString()
static <T> Value<T>	undefined() Returns an undefined value.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

undefined

public static <T> Value<T> undefined()

Returns an undefined value.

Type Parameters:

T - the value type

Returns:

undefined value

of

public static <T> Value<T> of(AstAttributeElement declaration,
                              T entity)

Returns a new value.

Type Parameters:

T - the value type

Parameters:

declaration - the original declaration

entity - the actual value

Returns:

the created value

orElse

public T orElse(T defaultValue)

Returns this if defined, or the default value.

Parameters:

defaultValue - the default value.

Returns:

this if defined, otherwise the default value

orDefault

public Value<T> orDefault(Value<T> defaultValue)

Returns this if defined, or the default value.

Parameters:

defaultValue - the default value.

Returns:

this if defined, otherwise the default value

getDeclaration

public AstAttributeElement getDeclaration()

Returns the declaration.

Returns:

the declaration

isDefined

public boolean isDefined()

Returns whether or not this value is explicitly defined.

Returns:

true if it is defined

isPresent

public boolean isPresent()

Returns whether or not this value is present.

Returns:

true if it is present

ifPresent

public void ifPresent(Consumer<T> action)

Accepts the entity only if this value is present.

Parameters:

action - the action

getEntity

public T getEntity()

Returns the entity.

Returns:

the entity

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object