E - the class of objects in list.public class RealmList<E extends RealmModel> extends AbstractList<E> implements OrderedRealmCollection<E>
RealmObject.
RealmList has two modes: A managed and unmanaged mode. In managed mode all objects are persisted inside a Realm, in
unmanaged mode it works as a normal ArrayList.
Only Realm can create managed RealmLists. Managed RealmLists will automatically update the content whenever the
underlying Realm is updated, and can only be accessed using the getter of a RealmObject.
Unmanaged RealmLists can be created by the user and can contain both managed and unmanaged RealmObjects. This is
useful when dealing with JSON deserializers like GSON or other frameworks that inject values into a class.
Unmanaged elements in this list can be added to a Realm using the Realm.copyToRealm(Iterable) method.
RealmList can contain more elements than Integer.MAX_VALUE.
In that case, you can access only first Integer.MAX_VALUE elements in it.
| Modifier and Type | Field and Description |
|---|---|
static String |
REMOVE_OUTSIDE_TRANSACTION_ERROR |
| Constructor and Description |
|---|
RealmList()
Creates a RealmList in unmanaged mode, where the elements are not controlled by a Realm.
|
RealmList(E... objects)
Creates a RealmList in unmanaged mode with an initial list of elements.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
add(E object)
Adds the specified object at the end of this List.
|
void |
add(int location,
E object)
Inserts the specified object into this List at the specified location.
|
void |
addChangeListener(OrderedRealmCollectionChangeListener<RealmList<E>> listener)
Adds a change listener to this
RealmList. |
void |
addChangeListener(RealmChangeListener<RealmList<E>> listener)
Adds a change listener to this
RealmList. |
<any> |
asObservable()
Returns an Rx Observable that monitors changes to this RealmList.
|
double |
average(String fieldName)
Returns the average of a given field.
|
void |
clear()
Removes all elements from this list, leaving it empty.
|
boolean |
contains(Object object)
Returns
true if the list contains the specified element when attached to a Realm. |
OrderedRealmCollectionSnapshot<E> |
createSnapshot()
Creates a snapshot from this
OrderedRealmCollection. |
boolean |
deleteAllFromRealm()
This deletes all objects in the collection from the underlying Realm as well as from the collection.
|
boolean |
deleteFirstFromRealm()
Deletes the first object from the Realm.
|
void |
deleteFromRealm(int location)
Deletes the object at the given index from the Realm.
|
boolean |
deleteLastFromRealm()
Deletes the last object from the Realm.
|
E |
first()
Gets the first object from the collection.
|
E |
first(E defaultValue)
Gets the first object from the collection.
|
E |
get(int location)
Returns the element at the specified location in this list.
|
boolean |
isLoaded()
Checks if a collection has finished loading its data yet.
|
boolean |
isManaged()
Checks if the collection is managed by Realm.
|
boolean |
isValid()
Checks if the collection is still valid to use, i.e., the
Realm instance hasn't been closed. |
Iterator<E> |
iterator() |
E |
last()
Gets the last object from the collection.
|
E |
last(E defaultValue)
Gets the last object from the collection.
|
ListIterator<E> |
listIterator() |
ListIterator<E> |
listIterator(int location) |
boolean |
load()
Blocks the collection until all data are available.
|
Number |
max(String fieldName)
Finds the maximum value of a field.
|
Date |
maxDate(String fieldName)
Finds the maximum date.
|
Number |
min(String fieldName)
Finds the minimum value of a field.
|
Date |
minDate(String fieldName)
Finds the minimum date.
|
void |
move(int oldPos,
int newPos)
Moves an object from one position to another, while maintaining a fixed sized list.
|
E |
remove(int location)
Removes the object at the specified location from this list.
|
boolean |
remove(Object object)
Removes one instance of the specified object from this
Collection if one
is contained. |
boolean |
removeAll(Collection<?> collection)
Removes all occurrences in this
Collection of each object in the
specified Collection. |
void |
removeAllChangeListeners()
Removes all user-defined change listeners.
|
void |
removeChangeListener(OrderedRealmCollectionChangeListener<RealmList<E>> listener)
Removes the specified change listener.
|
void |
removeChangeListener(RealmChangeListener<RealmList<E>> listener)
Removes the specified change listener.
|
E |
set(int location,
E object)
Replaces the element at the specified location in this list with the specified object.
|
int |
size()
Returns the number of elements in this
List. |
RealmResults<E> |
sort(String fieldName)
Sorts a collection based on the provided field in ascending order.
|
RealmResults<E> |
sort(String[] fieldNames,
Sort[] sortOrders)
Sorts a collection based on the provided fields and sort orders.
|
RealmResults<E> |
sort(String fieldName,
Sort sortOrder)
Sorts a collection based on the provided field and sort order.
|
RealmResults<E> |
sort(String fieldName1,
Sort sortOrder1,
String fieldName2,
Sort sortOrder2)
Sorts a collection based on the provided fields and sort orders.
|
Number |
sum(String fieldName)
Calculates the sum of a given field.
|
String |
toString() |
RealmQuery<E> |
where()
Returns a RealmQuery, which can be used to query for specific objects of this class.
|
addAll, equals, hashCode, indexOf, lastIndexOf, subListaddAll, containsAll, isEmpty, retainAll, toArray, toArrayaddAll, addAll, containsAll, equals, hashCode, indexOf, isEmpty, lastIndexOf, replaceAll, retainAll, sort, spliterator, subList, toArray, toArrayparallelStream, removeIf, streampublic static final String REMOVE_OUTSIDE_TRANSACTION_ERROR
public RealmList()
ArrayList and it is not possible to query
the objects in this state.
Use Realm.copyToRealm(Iterable) to properly persist its elements in Realm.
public RealmList(E... objects)
ArrayList and it is not possible to query the
objects in this state.
Use Realm.copyToRealm(Iterable) to properly persist all unmanaged elements in Realm.
objects - initial objects in the list.public boolean isValid()
Realm instance hasn't been closed. It
will always return true for an unmanaged collection.isValid in interface RealmCollection<E extends RealmModel>true if it is still valid to use or an unmanaged collection, false otherwise.public boolean isManaged()
If this method returns false, the collection is unmanaged. An unmanaged collection is just a normal java
collection, so it will not be live updated.
isManaged in interface RealmCollection<E extends RealmModel>true if this is a managed RealmCollection, false otherwise.public void add(int location,
E object)
Realm.copyToRealm(RealmModel) afterwards.Realm.copyToRealm(RealmModel)
or Realm.copyToRealmOrUpdate(RealmModel) if it has a primary key.add in interface List<E extends RealmModel>add in class AbstractList<E extends RealmModel>location - the index at which to insert.object - the object to add.IllegalStateException - if Realm instance has been closed or container object has been removed.IndexOutOfBoundsException - if location < 0 || location > size().public boolean add(E object)
Realm.copyToRealm(RealmModel) afterwards.Realm.copyToRealm(RealmModel)
or Realm.copyToRealmOrUpdate(RealmModel) if it has a primary key.add in interface Collection<E extends RealmModel>add in interface List<E extends RealmModel>add in class AbstractList<E extends RealmModel>object - the object to add.true.IllegalStateException - if Realm instance has been closed or parent object has been removed.public E set(int location, E object)
Realm.copyToRealm(RealmModel) afterwards.Realm.copyToRealm(RealmModel) or
Realm.copyToRealmOrUpdate(RealmModel) if it has a primary key.set in interface List<E extends RealmModel>set in class AbstractList<E extends RealmModel>location - the index at which to put the specified object.object - the object to add.IllegalStateException - if Realm instance has been closed or parent object has been removed.IndexOutOfBoundsException - if location < 0 || location >= size().public void move(int oldPos,
int newPos)
null values are introduced.oldPos - index of RealmObject to move.newPos - target position. If newPos < oldPos the object at the location will be shifted to the right. If
oldPos < newPos, indexes > oldPos will be shifted once to the left.IllegalStateException - if Realm instance has been closed or parent object has been removed.IndexOutOfBoundsException - if any position is outside [0, size()].public void clear()
clear in interface Collection<E extends RealmModel>clear in interface List<E extends RealmModel>clear in class AbstractList<E extends RealmModel>IllegalStateException - if Realm instance has been closed or parent object has been removed.List.isEmpty(),
List.size(),
deleteAllFromRealm()public E remove(int location)
remove in interface List<E extends RealmModel>remove in class AbstractList<E extends RealmModel>location - the index of the object to remove.IllegalStateException - if Realm instance has been closed or parent object has been removed.IndexOutOfBoundsException - if location < 0 || location >= size().public boolean remove(Object object)
Collection if one
is contained. This implementation iterates over this
Collection and tests each element e returned by the iterator,
whether e is equal to the given object. If object != null
then this test is performed using object.equals(e), otherwise
using object == null. If an element equal to the given object is
found, then the remove method is called on the iterator and
true is returned, false otherwise. If the iterator does
not support removing elements, an UnsupportedOperationException
is thrown.remove in interface Collection<E extends RealmModel>remove in interface List<E extends RealmModel>remove in class AbstractCollection<E extends RealmModel>object - the object to remove.true if this Collection is modified, false otherwise.ClassCastException - if the object passed is not of the correct type.NullPointerException - if object is null.public boolean removeAll(Collection<?> collection)
Collection of each object in the
specified Collection. After this method returns none of the
elements in the passed Collection can be found in this Collection
anymore.
This implementation iterates over the Collection and tests each
element e returned by the iterator, whether it is contained in
the specified Collection. If this test is positive, then the remove method is called on the iterator.
removeAll in interface Collection<E extends RealmModel>removeAll in interface List<E extends RealmModel>removeAll in class AbstractCollection<E extends RealmModel>collection - the collection of objects to remove.true if this Collection is modified, false otherwise.ClassCastException - if one or more elements of collection isn't of the correct type.NullPointerException - if collection is null.public boolean deleteFirstFromRealm()
deleteFirstFromRealm in interface OrderedRealmCollection<E extends RealmModel>true if an object was deleted, false otherwise.public boolean deleteLastFromRealm()
deleteLastFromRealm in interface OrderedRealmCollection<E extends RealmModel>true if an object was deleted, false otherwise.public E get(int location)
get in interface List<E extends RealmModel>get in class AbstractList<E extends RealmModel>location - the index of the element to return.IllegalStateException - if Realm instance has been closed or parent object has been removed.IndexOutOfBoundsException - if location < 0 || location >= size().public E first()
first in interface OrderedRealmCollection<E extends RealmModel>public E first(E defaultValue)
first in interface OrderedRealmCollection<E extends RealmModel>public E last()
last in interface OrderedRealmCollection<E extends RealmModel>public E last(E defaultValue)
last in interface OrderedRealmCollection<E extends RealmModel>public RealmResults<E> sort(String fieldName)
sort in interface OrderedRealmCollection<E extends RealmModel>fieldName - the field name to sort by. Only fields of type boolean, short, int, long, float, double, Date,
and String are supported.RealmResults will be created and returned. The original collection stays unchanged.public RealmResults<E> sort(String fieldName, Sort sortOrder)
sort in interface OrderedRealmCollection<E extends RealmModel>fieldName - the field name to sort by. Only fields of type boolean, short, int, long, float, double, Date,
and String are supported.sortOrder - the direction to sort by.RealmResults will be created and returned. The original collection stays unchanged.public RealmResults<E> sort(String fieldName1, Sort sortOrder1, String fieldName2, Sort sortOrder2)
sort in interface OrderedRealmCollection<E extends RealmModel>fieldName1 - first field name. Only fields of type boolean, short, int, long, float,
double, Date, and String are supported.sortOrder1 - sort order for first field.fieldName2 - second field name. Only fields of type boolean, short, int, long, float,
double, Date, and String are supported.sortOrder2 - sort order for second field.RealmResults will be created and returned. The original collection stays unchanged.public RealmResults<E> sort(String[] fieldNames, Sort[] sortOrders)
sort in interface OrderedRealmCollection<E extends RealmModel>fieldNames - an array of field names to sort by. Only fields of type boolean, short, int, long, float,
double, Date, and String are supported.sortOrders - the directions to sort by.RealmResults will be created and returned. The original collection stays unchanged.public void deleteFromRealm(int location)
deleteFromRealm in interface OrderedRealmCollection<E extends RealmModel>location - the array index identifying the object to be removed.public int size()
List.size in interface Collection<E extends RealmModel>size in interface List<E extends RealmModel>size in class AbstractCollection<E extends RealmModel>List.IllegalStateException - if Realm instance has been closed or parent object has been removed.public RealmQuery<E> where()
where in interface RealmCollection<E extends RealmModel>IllegalStateException - if Realm instance has been closed or parent object has been removed.RealmQuerypublic Number min(String fieldName)
min in interface RealmCollection<E extends RealmModel>fieldName - the field to look for a minimum on. Only number fields are supported.null as the value for the given field, null will be
returned. Otherwise the minimum value is returned. When determining the minimum value, objects with null
values are ignored.public Number max(String fieldName)
max in interface RealmCollection<E extends RealmModel>fieldName - the field to look for a maximum on. Only number fields are supported.null as the value for the given field, null will be
returned. Otherwise the maximum value is returned. When determining the maximum value, objects with null
values are ignored.public Number sum(String fieldName)
sum in interface RealmCollection<E extends RealmModel>fieldName - the field to sum. Only number fields are supported.null as the value for the given field, 0
will be returned. When computing the sum, objects with null values are ignored.public double average(String fieldName)
average in interface RealmCollection<E extends RealmModel>fieldName - the field to calculate average on. Only number fields are supported.null as the value for the given field,
0 will be returned. When computing the average, objects with null values are ignored.public Date maxDate(String fieldName)
maxDate in interface RealmCollection<E extends RealmModel>fieldName - the field to look for the maximum date. If fieldName is not of Date type, an exception is
thrown.null as the value for the given date field, null
will be returned. Otherwise the maximum date is returned. When determining the maximum date, objects with
null values are ignored.public Date minDate(String fieldName)
minDate in interface RealmCollection<E extends RealmModel>fieldName - the field to look for the minimum date. If fieldName is not of Date type, an exception is
thrown.null as the value for the given date field, null
will be returned. Otherwise the minimum date is returned. When determining the minimum date, objects with
null values are ignored.public boolean deleteAllFromRealm()
deleteAllFromRealm in interface RealmCollection<E extends RealmModel>true if objects was deleted, false otherwise.public boolean isLoaded()
isLoaded in interface RealmCollection<E extends RealmModel>true if data has been loaded and is available, false if data is still being loaded.public boolean load()
load in interface RealmCollection<E extends RealmModel>true if the data could be successfully loaded, false otherwise.public boolean contains(Object object)
true if the list contains the specified element when attached to a Realm. This
method will query the native Realm underlying storage engine to quickly find the specified element.
If the list is not attached to a Realm, the default List.contains(Object)
implementation will occur.
contains in interface RealmCollection<E extends RealmModel>contains in interface Collection<E extends RealmModel>contains in interface List<E extends RealmModel>contains in class AbstractCollection<E extends RealmModel>object - the element whose presence in this list is to be tested.true if this list contains the specified element otherwise false.public Iterator<E> iterator()
iterator in interface Iterable<E extends RealmModel>iterator in interface Collection<E extends RealmModel>iterator in interface List<E extends RealmModel>iterator in class AbstractList<E extends RealmModel>public ListIterator<E> listIterator()
listIterator in interface List<E extends RealmModel>listIterator in class AbstractList<E extends RealmModel>public ListIterator<E> listIterator(int location)
listIterator in interface List<E extends RealmModel>listIterator in class AbstractList<E extends RealmModel>public OrderedRealmCollectionSnapshot<E> createSnapshot()
OrderedRealmCollection.createSnapshot in interface OrderedRealmCollection<E extends RealmModel>OrderedRealmCollectionSnapshotpublic String toString()
toString in class AbstractCollection<E extends RealmModel>public <any> asObservable()
onComplete will never be called.
If you would like the asObservable() to stop emitting items you can instruct RxJava to
only emit only the first item by using the first() operator:
list.asObservable()
.first()
.subscribe( ... ) // You only get the results once
Note that when the Realm is accessed from threads other than where it was created,
IllegalStateException will be thrown. Care should be taken when using different schedulers
with subscribeOn() and observeOn().
onNext. It will never call onComplete or OnError.UnsupportedOperationException - if the required RxJava framework is not on the classpath or the
corresponding Realm instance doesn't support RxJava.public void addChangeListener(OrderedRealmCollectionChangeListener<RealmList<E>> listener)
RealmList.listener - the change listener to be notified.IllegalArgumentException - if the change listener is null.IllegalStateException - if you try to add a listener from a non-Looper or
IntentService thread.public void removeChangeListener(OrderedRealmCollectionChangeListener<RealmList<E>> listener)
listener - the change listener to be removed.IllegalArgumentException - if the change listener is null.IllegalStateException - if you try to remove a listener from a non-Looper Thread.RealmChangeListenerpublic void addChangeListener(RealmChangeListener<RealmList<E>> listener)
RealmList.listener - the change listener to be notified.IllegalArgumentException - if the change listener is null.IllegalStateException - if you try to add a listener from a non-Looper or
IntentService thread.public void removeChangeListener(RealmChangeListener<RealmList<E>> listener)
listener - the change listener to be removed.IllegalArgumentException - if the change listener is null.IllegalStateException - if you try to remove a listener from a non-Looper Thread.RealmChangeListenerpublic void removeAllChangeListeners()
IllegalStateException - if you try to remove listeners from a non-Looper Thread.RealmChangeListener