com.atlassian.confluence.api.model.reference

Class Reference<T>

java.lang.Object

com.atlassian.confluence.api.model.reference.Reference<T>

Type Parameters:

T - - the type of the Referent object

All Implemented Interfaces:

java.lang.Iterable<T>

Direct Known Subclasses:

CollapsedReference, EmptyReference, ExpandedReference

@ExperimentalApi
public abstract class Reference<T>
extends java.lang.Object
implements java.lang.Iterable<T>

A reference to a model object. References can be either expanded or collapsed. The object that a reference points to can either exist or not. If a reference both exists and is expanded then call to get() will return the referenced object. Collapsed References provide id properties that give just enough information to identify the referenced object. Model object that wish to be able to have references generated for them need to provide an enum named IdProperties. This enum must have values that match the name of the fields in the object that comprise it's ID.

Constructor Summary

Constructors

Constructor and Description
Reference()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> Reference<T>	collapsed(java.lang.Class objClass, java.util.Map idProperties)
static <T> Reference<T>	collapsed(T obj) create a collapse reference to the given object
static <T> Reference<T>	empty(java.lang.Class<T> referrentClass) create an empty reference to the given class
abstract boolean	exists()
abstract T	get()
abstract java.util.Map<java.lang.Object,java.lang.Object>	getIdProperties() A map of properties key by the idProperty enum in the model class for the referent object.
java.lang.Object	getIdProperty(java.lang.Enum key)
abstract boolean	isExpanded() indicates a reference is expanded and can be resolved to an object by calling get, or whether the reference is collapsed and calling get will throw an exception.
static <T> Reference<T>	orEmpty(Reference<T> reference, java.lang.Class<T> referentClass)
static <T> Reference<T>	orEmpty(T entity, java.lang.Class<T> referentClass)
abstract java.lang.Class<? extends T>	referentClass()
static <T> Reference<T>	to(T obj) create an exanded reference to the referent object

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

iterator

Constructor Detail

Reference

public Reference()

Method Detail

get

public abstract T get()
               throws java.lang.IllegalStateException

Returns:

the reference object or null if the object does not exist. It is Illegal to call get() on a reference that has not been expanded

Throws:

java.lang.IllegalStateException

exists

public abstract boolean exists()

Returns:

true if the object is expanded and exists, or is collapsed and has enough information to identify itself, false if the object does not exist (is empty)

isExpanded

public abstract boolean isExpanded()

indicates a reference is expanded and can be resolved to an object by calling get, or whether the reference is collapsed and calling get will throw an exception.

Returns:

true if the reference is expanded, false otherwise

getIdProperties

public abstract java.util.Map<java.lang.Object,java.lang.Object> getIdProperties()

A map of properties key by the idProperty enum in the model class for the referent object. The map contains properties sufficient to identify the referent object.

Returns:

a map of id properties keyed by idProperty enum

getIdProperty

public java.lang.Object getIdProperty(java.lang.Enum key)

referentClass

public abstract java.lang.Class<? extends T> referentClass()

Returns:

the class of the referent object.

empty

public static <T> Reference<T> empty(java.lang.Class<T> referrentClass)

create an empty reference to the given class

Type Parameters:

T -

Parameters:

referrentClass -

Returns:

orEmpty

public static <T> Reference<T> orEmpty(Reference<T> reference,
                       java.lang.Class<T> referentClass)

Type Parameters:

T -

Parameters:

reference -

referentClass -

Returns:

the reference parameter or an empty reference if the reference is null or does not exist

orEmpty

public static <T> Reference<T> orEmpty(T entity,
                       java.lang.Class<T> referentClass)

collapsed

public static <T> Reference<T> collapsed(T obj)

create a collapse reference to the given object

Parameters:

obj -

Returns:

collapsed

public static <T> Reference<T> collapsed(java.lang.Class objClass,
                         java.util.Map idProperties)

to

public static <T> Reference<T> to(T obj)

create an exanded reference to the referent object

Parameters:

obj -

Returns: