Package cz.cvut.kbss.jopa.proxy.lazy

Class LazyLoadingMapProxy<T,K,V>

java.lang.Object

cz.cvut.kbss.jopa.proxy.lazy.LazyLoadingMapProxy<T,K,V>

Type Parameters:

T - Type of the object whose attribute value is this map proxy

K - Map key type

V - Map value type

All Implemented Interfaces:

LazyLoadingProxy<Map<K,V>>, Map<K,V>

public class LazyLoadingMapProxy<T,K,V>
extends Object
implements LazyLoadingProxy<Map<K,V>>, Map<K,V>

Map proxy that triggers lazy loading when its contents is accessed.

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Field Summary

Fields

Modifier and Type	Field	Description
protected final FieldSpecification<? super T,Map<K,V>>	fieldSpec
protected final T	owner
protected final UnitOfWork	persistenceContext

Constructor Summary

Constructors

Constructor	Description
LazyLoadingMapProxy(T owner, FieldSpecification<? super T,Map<K,V>> fieldSpec, UnitOfWork persistenceContext)

Method Summary

Modifier and Type	Method	Description
void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set<Map.Entry<K,V>>	entrySet()
V	get(Object key)
Map<K,V>	getLoadedValue()	If this proxy has already been loaded, this method returns the loaded value.
boolean	isEmpty()
boolean	isLoaded()	Checks whether this proxy has already been loaded.
Set<K>	keySet()
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> m)
V	remove(Object key)
int	size()
String	toString()
Map<K,V>	triggerLazyLoading()	Triggers value loading.
Map<K,V>	unwrap()	Gets a value that should be used to replace this proxy outside a persistence context.
Collection<V>	values()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, forEach, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Details

owner

protected final T owner

fieldSpec

protected final FieldSpecification<? super T,Map<K,V>> fieldSpec

persistenceContext

protected final UnitOfWork persistenceContext

Constructor Details

LazyLoadingMapProxy

public LazyLoadingMapProxy(T owner,
 FieldSpecification<? super T,Map<K,V>> fieldSpec,
 UnitOfWork persistenceContext)

Method Details

triggerLazyLoading

public Map<K,V> triggerLazyLoading()

Description copied from interface: LazyLoadingProxy

Triggers value loading.

Specified by:

triggerLazyLoading in interface LazyLoadingProxy<T>

Returns:

Loaded value

isLoaded

public boolean isLoaded()

Description copied from interface: LazyLoadingProxy

Checks whether this proxy has already been loaded.

Specified by:

isLoaded in interface LazyLoadingProxy<T>

Returns:

true if this proxy has been loaded, false otherwise

getLoadedValue

public Map<K,V> getLoadedValue()

Description copied from interface: LazyLoadingProxy

If this proxy has already been loaded, this method returns the loaded value.

Specified by:

getLoadedValue in interface LazyLoadingProxy<T>

Returns:

The loaded value, null if this proxy has not been loaded, yet

See Also:

• LazyLoadingProxy.isLoaded()

unwrap

public Map<K,V> unwrap()

Description copied from interface: LazyLoadingProxy

Gets a value that should be used to replace this proxy outside a persistence context.

Specified by:

unwrap in interface LazyLoadingProxy<T>

Returns:

Default value to replace this proxy with

size

public int size()

Specified by:

size in interface Map<T,K>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<T,K>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<T,K>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<T,K>

get

public V get(Object key)

Specified by:

get in interface Map<T,K>

put

public V put(K key,
 V value)

Specified by:

put in interface Map<T,K>

remove

public V remove(Object key)

Specified by:

remove in interface Map<T,K>

putAll

public void putAll(Map<? extends K,? extends V> m)

Specified by:

putAll in interface Map<T,K>

clear

public void clear()

Specified by:

clear in interface Map<T,K>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<T,K>

values

public Collection<V> values()

Specified by:

values in interface Map<T,K>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<T,K>

toString

public String toString()

Overrides:

toString in class Object