alexh.weak

Class ParentAbsence<Parent extends Dynamic>

java.lang.Object

alexh.weak.ParentAbsence<Parent>

Direct Known Subclasses:

ParentAbsence.Barren, ParentAbsence.Empty

public abstract class ParentAbsence<Parent extends Dynamic>
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ParentAbsence.Barren<P extends Dynamic & alexh.weak.Describer>
static class	ParentAbsence.Empty<P extends Dynamic & alexh.weak.Describer>

Field Summary

Fields

Modifier and Type	Field and Description
static String	ARROW
protected Object	key
protected Parent	parent

Fields inherited from interface alexh.weak.Dynamic

ROOT_KEY

Constructor Summary

Constructors

Constructor and Description
ParentAbsence(Parent parent, Object key)

Method Summary

Modifier and Type	Method and Description
default <T> T	as(Class<T> type) As Weak.asObject() casting to input type, and providing a better message in the exceptional case
Object	asObject() Returns inner value implicitly asserting that the value is not absent, ie Weak.isPresent() is true
Stream<Dynamic>	children()
protected abstract String	describeIssue(LinkedList<Object> ascendingMarkedKeyChain, Object parentKey)
String	describeIssue(List<Object> childKeys)
boolean	equals(Object o)
static alexh.weak.DynamicChild	from(Dynamic parent, Object key, Object val)
Dynamic	get(Object key) Returns a dynamic wrapping the immediate child of this instance with the input key, or a dynamic representing the lack of such a child.
int	hashCode()
boolean	isPresent() Returns if this instance wraps a non-null value.
Dynamic	key() Returns Weak instance wrapping the key for this node.
static alexh.weak.DynamicChild	key(Dynamic parent, Object key)
Dynamic	parent()
Parent	parent()
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface alexh.weak.Dynamic

allChildren, allChildrenBreadthFirst, allChildrenDepthFirst, children, dget, from, get, key

Methods inherited from interface alexh.weak.Weak

asList, asMap, asOptional, asString, convert, is, isList, isMap, isPresent, isString, maybe

Field Detail

ARROW

public static final String ARROW

See Also:

Constant Field Values

parent

protected final Parent extends Dynamic parent

key

protected final Object key

Constructor Detail

ParentAbsence

public ParentAbsence(Parent parent,
                     Object key)

Method Detail

describeIssue

protected abstract String describeIssue(LinkedList<Object> ascendingMarkedKeyChain,
                                        Object parentKey)

describeIssue

public final String describeIssue(List<Object> childKeys)

Parameters:

childKeys - all child keys of this empty child in ascending order

Returns:

the reason this child has an issue

get

public Dynamic get(Object key)

Description copied from interface: Dynamic

Returns a dynamic wrapping the immediate child of this instance with the input key, or a dynamic representing the lack of such a child. This is never null.

Parameters:

key - child key

Returns:

dynamic representing the child matching the input key, or a dynamic representing the key's absence

asObject

public Object asObject()

Description copied from interface: Weak

Returns inner value implicitly asserting that the value is not absent, ie Weak.isPresent() is true

Returns:

unwrapped inner value

from

public static alexh.weak.DynamicChild from(Dynamic parent,
                                           Object key,
                                           Object val)

key

public static alexh.weak.DynamicChild key(Dynamic parent,
                                          Object key)

parent

public Dynamic parent()

as

public <T> T as(Class<T> type)

Description copied from interface: Dynamic

As Weak.asObject() casting to input type, and providing a better message in the exceptional case

Specified by:

as in interface Dynamic

Specified by:

as in interface Weak<Dynamic>

Type Parameters:

T - cast type

Parameters:

type - cast type

Returns:

unwrapped inner value cast to input type

parent

public Parent parent()

key

public Dynamic key()

Description copied from interface: Dynamic

Returns Weak instance wrapping the key for this node. To get the inner key call Weak.asObject() Top-level Dynamic objects have the key value Dynamic.ROOT_KEY

Returns:

key instance wrapper

isPresent

public boolean isPresent()

Description copied from interface: Weak

Returns if this instance wraps a non-null value. True implies Weak.asObject() will not throw

Returns:

if this instance wraps a non-null value

children

public Stream<Dynamic> children()

Returns:

stream of all immediate children of this instance

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object