OrderedRealmCollectionSnapshot (Realm 5.8.0)

java.lang.Object
- java.util.AbstractCollection<E>
- - java.util.AbstractList<E>
  - - io.realm.OrderedRealmCollectionSnapshot<E>

All Implemented Interfaces:: OrderedRealmCollection<E>, RealmCollection<E>, Iterable<E>, Collection<E>, List<E>

public class OrderedRealmCollectionSnapshot<E>
extends AbstractList<E>

An OrderedRealmCollectionSnapshot is a special type of OrderedRealmCollection. It can be created by calling OrderedRealmCollection.createSnapshot(). Unlike RealmResults and RealmList, its size and order of elements will never be changed after creation.

OrderedRealmCollectionSnapshot is useful when making changes which may impact the size or order of the collection in simple loops. For example:

 
 final RealmResults<Dog>  dogs = realm.where(Dog.class).findAll();
 final OrderedRealmCollectionSnapshot<Dog> snapshot = dogs.createSnapshot();
 final int dogsCount = snapshot.size(); // dogs.size() == snapshot.size() == 10
 realm.executeTransaction(new Realm.Transaction() {
     /@Override
     public void execute(Realm realm) {
         for (int i = 0; i < dogsCount; i++) {
         // This won't work since RealmResults is always up-to-date, its size gets decreased by 1 after every loop. An
         // IndexOutOfBoundsException will be thrown after 5 loops.
         // dogs.deleteFromRealm(i);
         snapshot.deleteFromRealm(i); // Deletion on OrderedRealmCollectionSnapshot won't change the size of it.
         }
     }
 });

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`boolean`	`add(E element)` Deprecated.
`void`	`add(int index, E element)` Deprecated.
`boolean`	`addAll(Collection<? extends E> collection)` Deprecated.
`boolean`	`addAll(int location, Collection<? extends E> collection)` Deprecated.
`double`	`average(String fieldName)` Returns the average of a given field.
`void`	`clear()` Deprecated.
`boolean`	`contains(Object object)` Searches this `OrderedRealmCollection` for the specified object.
`OrderedRealmCollectionSnapshot<E>`	`createSnapshot()` Creates a snapshot from this `OrderedRealmCollection`.
`boolean`	`deleteAllFromRealm()` This deletes all objects in the collection from the underlying Realm.
`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.
`Realm`	`getRealm()` Returns the `Realm` instance to which this collection belongs.
`boolean`	`isLoaded()` Checks if a collection has finished loading its data yet.
`boolean`	`isManaged()` A `RealmResults` or a `OrderedRealmCollectionSnapshot` is always a managed collection.
`boolean`	`isValid()` Checks if the collection is still valid to use, i.e., the `Realm` instance hasn't been closed.
`Iterator<E>`	`iterator()` Returns an iterator for the results of a query.
`E`	`last()` Gets the last object from the collection.
`E`	`last(E defaultValue)` Gets the last object from the collection.
`ListIterator<E>`	`listIterator()` Returns a list iterator for the results of a query.
`ListIterator<E>`	`listIterator(int location)` Returns a list iterator on the results of a query.
`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.
`E`	`remove(int index)` Deprecated.
`boolean`	`remove(Object object)` Deprecated.
`boolean`	`removeAll(Collection<?> collection)` Deprecated.
`boolean`	`retainAll(Collection<?> collection)` Deprecated.
`E`	`set(int location, E object)` Deprecated.
`int`	`size()` Returns the number of elements in this query result.
`RealmResults<E>`	`sort(String fieldName)` Not supported by `OrderedRealmCollectionSnapshot`.
`RealmResults<E>`	`sort(String[] fieldNames, Sort[] sortOrders)` Not supported by `OrderedRealmCollectionSnapshot`.
`RealmResults<E>`	`sort(String fieldName, Sort sortOrder)` Not supported by `OrderedRealmCollectionSnapshot`.
`RealmResults<E>`	`sort(String fieldName1, Sort sortOrder1, String fieldName2, Sort sortOrder2)` Not supported by `OrderedRealmCollectionSnapshot`.
`Number`	`sum(String fieldName)` Calculates the sum of a given field.
`RealmQuery<E>`	`where()` Deprecated.

Methods inherited from class java.util.AbstractList
equals, hashCode, indexOf, lastIndexOf, subList

Methods inherited from class java.util.AbstractCollection
containsAll, isEmpty, toArray, toArray, toString

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.List
containsAll, equals, hashCode, indexOf, isEmpty, lastIndexOf, replaceAll, sort, spliterator, subList, toArray, toArray

Methods inherited from interface java.util.Collection
parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable
forEach

- Method Detail
  - size
```
public int size()
```
    Returns the number of elements in this query result.
    
    Specified by:
    
    size in interface Collection<E>
    
    Specified by:
    
    size in interface List<E>
    
    Returns:
    
    the number of elements in this query result.
  - sort
```
public RealmResults<E> sort(String fieldName)
```
    Not supported by OrderedRealmCollectionSnapshot. Use 'sort()' on the original OrderedRealmCollection instead.
    
    Specified by:
    
    sort in interface OrderedRealmCollection<E>
    
    Parameters:
    
    fieldName - the field name to sort by. Only fields of type boolean, short, int, long, float, double, Date, and String are supported.
    
    Returns:
    
    a new sorted RealmResults will be created and returned. The original collection stays unchanged.
    
    Throws:
    
    UnsupportedOperationException
  - sort
```
public RealmResults<E> sort(String fieldName,
                            Sort sortOrder)
```
    Not supported by OrderedRealmCollectionSnapshot. Use 'sort()' on the original OrderedRealmCollection instead.
    
    Specified by:
    
    sort in interface OrderedRealmCollection<E>
    
    Parameters:
    
    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.
    
    Returns:
    
    a new sorted RealmResults will be created and returned. The original collection stays unchanged.
    
    Throws:
    
    UnsupportedOperationException
  - sort
```
public RealmResults<E> sort(String fieldName1,
                            Sort sortOrder1,
                            String fieldName2,
                            Sort sortOrder2)
```
    Not supported by OrderedRealmCollectionSnapshot. Use 'sort()' on the original OrderedRealmCollection instead.
    
    Specified by:
    
    sort in interface OrderedRealmCollection<E>
    
    Parameters:
    
    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.
    
    Returns:
    
    a new sorted RealmResults will be created and returned. The original collection stays unchanged.
    
    Throws:
    
    UnsupportedOperationException
  - sort
```
public RealmResults<E> sort(String[] fieldNames,
                            Sort[] sortOrders)
```
    Not supported by OrderedRealmCollectionSnapshot. Use 'sort()' on the original OrderedRealmCollection instead.
    
    Specified by:
    
    sort in interface OrderedRealmCollection<E>
    
    Parameters:
    
    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.
    
    Returns:
    
    a new sorted RealmResults will be created and returned. The original collection stays unchanged.
    
    Throws:
    
    UnsupportedOperationException
  - where
```
@Deprecated
public RealmQuery<E> where()
```
    Deprecated.
    
    Not supported by OrderedRealmCollectionSnapshot. Use 'where()' on the original OrderedRealmCollection instead.
    
    Returns:
    
    a RealmQuery object.
    
    Throws:
    
    UnsupportedOperationException
    
    See Also:
    
    RealmQuery
  - isLoaded
```
public boolean isLoaded()
```
    Checks if a collection has finished loading its data yet.
    
    Returns:
    
    true if data has been loaded and is available, false if data is still being loaded.
  - load
```
public boolean load()
```
    Blocks the collection until all data are available.
    
    Returns:
    
    true if the data could be successfully loaded, false otherwise.
  - createSnapshot
```
public OrderedRealmCollectionSnapshot<E> createSnapshot()
```
    Creates a snapshot from this OrderedRealmCollection.
    
    Specified by:
    
    createSnapshot in interface OrderedRealmCollection<E>
    
    Returns:
    
    the snapshot of this collection.
    
    See Also:
    
    OrderedRealmCollectionSnapshot
  - deleteFromRealm
```
public void deleteFromRealm(int location)
```
    Deletes the object at the given index from the Realm. The object at the given index will become invalid. Just returns if the object is invalid already.
    
    Specified by:
    
    deleteFromRealm in interface OrderedRealmCollection<E>
    
    Parameters:
    
    location - the array index identifying the object to be removed.
    
    Throws:
    
    IndexOutOfBoundsException - if location < 0 || location >= size().
    
    IllegalStateException - if the Realm is closed or the method is called from the wrong thread.
  - deleteFirstFromRealm
```
public boolean deleteFirstFromRealm()
```
    Deletes the first object from the Realm. The first object will become invalid.
    
    Specified by:
    
    deleteFirstFromRealm in interface OrderedRealmCollection<E>
    
    Returns:
    
    true if an object was deleted, false otherwise.
    
    Throws:
    
    IllegalStateException - if the Realm is closed or the method is called on the wrong thread.
  - deleteLastFromRealm
```
public boolean deleteLastFromRealm()
```
    Deletes the last object from the Realm. The last object will become invalid.
    
    Specified by:
    
    deleteLastFromRealm in interface OrderedRealmCollection<E>
    
    Returns:
    
    true if an object was deleted, false otherwise.
    
    Throws:
    
    IllegalStateException - if the Realm is closed or the method is called from the wrong thread.
  - deleteAllFromRealm
```
public boolean deleteAllFromRealm()
```
    This deletes all objects in the collection from the underlying Realm. All objects in the collection snapshot will become invalid.
    
    Specified by:
    
    deleteAllFromRealm in interface RealmCollection<E>
    
    Returns:
    
    true if objects was deleted, false otherwise.
    
    Throws:
    
    IllegalStateException - if the corresponding Realm is closed or in an incorrect thread.
    
    IllegalStateException - if the Realm has been closed or called from an incorrect thread.
  - isValid
```
public boolean isValid()
```
    Checks if the collection is still valid to use, i.e., the Realm instance hasn't been closed. It will always return true for an unmanaged collection.
    
    Specified by:
    
    isValid in interface RealmCollection<E>
    
    Returns:
    
    true if it is still valid to use or an unmanaged collection, false otherwise.
  - isManaged
```
public boolean isManaged()
```
    A RealmResults or a OrderedRealmCollectionSnapshot is always a managed collection.
    
    Specified by:
    
    isManaged in interface RealmCollection<E>
    
    Returns:
    
    true.
    
    See Also:
    
    RealmCollection.isManaged()
  - contains
```
public boolean contains(Object object)
```
    Searches this OrderedRealmCollection for the specified object.
    
    Specified by:
    
    contains in interface RealmCollection<E>
    
    Specified by:
    
    contains in interface Collection<E>
    
    Specified by:
    
    contains in interface List<E>
    
    Overrides:
    
    contains in class AbstractCollection<E>
    
    Parameters:
    
    object - the object to search for.
    
    Returns:
    
    true if object is an element of this OrderedRealmCollection, false otherwise.
  - get
```
public E get(int location)
```
    Returns the element at the specified location in this list.
    
    Specified by:
    
    get in interface List<E>
    
    Specified by:
    
    get in class AbstractList<E>
    
    Parameters:
    
    location - the index of the element to return.
    
    Returns:
    
    the element at the specified index.
    
    Throws:
    
    IndexOutOfBoundsException - if location < 0 || location >= size().
  - first
```
public E first()
```
    Gets the first object from the collection.
    
    Specified by:
    
    first in interface OrderedRealmCollection<E>
    
    Returns:
    
    the first object.
  - first
```
public E first(E defaultValue)
```
    Gets the first object from the collection. If the collection is empty, the provided default will be used instead.
    
    Specified by:
    
    first in interface OrderedRealmCollection<E>
    
    Returns:
    
    the first object or the provided default.
  - last
```
public E last()
```
    Gets the last object from the collection.
    
    Specified by:
    
    last in interface OrderedRealmCollection<E>
    
    Returns:
    
    the last object.
  - last
```
public E last(E defaultValue)
```
    Gets the last object from the collection. If the collection is empty, the provided default will be used instead.
    
    Specified by:
    
    last in interface OrderedRealmCollection<E>
    
    Returns:
    
    the last object or the provided default.
  - iterator
```
public Iterator<E> iterator()
```
    Returns an iterator for the results of a query. Any change to Realm while iterating will cause this iterator to throw a ConcurrentModificationException if accessed.
    
    Specified by:
    
    iterator in interface Iterable<E>
    
    Specified by:
    
    iterator in interface Collection<E>
    
    Specified by:
    
    iterator in interface List<E>
    
    Overrides:
    
    iterator in class AbstractList<E>
    
    Returns:
    
    an iterator on the elements of this list.
    
    See Also:
    
    Iterator
  - listIterator
```
public ListIterator<E> listIterator()
```
    Returns a list iterator for the results of a query. Any change to Realm while iterating will cause the iterator to throw a ConcurrentModificationException if accessed.
    
    Specified by:
    
    listIterator in interface List<E>
    
    Overrides:
    
    listIterator in class AbstractList<E>
    
    Returns:
    
    a ListIterator on the elements of this list.
    
    See Also:
    
    ListIterator
  - listIterator
```
public ListIterator<E> listIterator(int location)
```
    Returns a list iterator on the results of a query. Any change to Realm while iterating will cause the iterator to throw a ConcurrentModificationException if accessed.
    
    Specified by:
    
    listIterator in interface List<E>
    
    Overrides:
    
    listIterator in class AbstractList<E>
    
    Parameters:
    
    location - the index at which to start the iteration.
    
    Returns:
    
    a ListIterator on the elements of this list.
    
    Throws:
    
    IndexOutOfBoundsException - if location < 0 || location > size().
    
    See Also:
    
    ListIterator
  - min
```
public Number min(String fieldName)
```
    Finds the minimum value of a field.
    
    Specified by:
    
    min in interface RealmCollection<E>
    
    Parameters:
    
    fieldName - the field to look for a minimum on. Only number fields are supported.
    
    Returns:
    
    if no objects exist or they all have 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.
  - minDate
```
public Date minDate(String fieldName)
```
    Finds the minimum date.
    
    Specified by:
    
    minDate in interface RealmCollection<E>
    
    Parameters:
    
    fieldName - the field to look for the minimum date. If fieldName is not of Date type, an exception is thrown.
    
    Returns:
    
    if no objects exist or they all have 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.
  - max
```
public Number max(String fieldName)
```
    Finds the maximum value of a field.
    
    Specified by:
    
    max in interface RealmCollection<E>
    
    Parameters:
    
    fieldName - the field to look for a maximum on. Only number fields are supported.
    
    Returns:
    
    if no objects exist or they all have 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.
  - maxDate
```
public Date maxDate(String fieldName)
```
    Finds the maximum date.
    
    Specified by:
    
    maxDate in interface RealmCollection<E>
    
    Parameters:
    
    fieldName - the field to look for the maximum date. If fieldName is not of Date type, an exception is thrown.
    
    Returns:
    
    if no objects exist or they all have 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.
    
    Throws:
    
    IllegalArgumentException - if fieldName is not a Date field.
  - sum
```
public Number sum(String fieldName)
```
    Calculates the sum of a given field.
    
    Specified by:
    
    sum in interface RealmCollection<E>
    
    Parameters:
    
    fieldName - the field to sum. Only number fields are supported.
    
    Returns:
    
    the sum. If no objects exist or they all have null as the value for the given field, 0 will be returned. When computing the sum, objects with null values are ignored.
  - average
```
public double average(String fieldName)
```
    Returns the average of a given field.
    
    Specified by:
    
    average in interface RealmCollection<E>
    
    Parameters:
    
    fieldName - the field to calculate average on. Only number fields are supported.
    
    Returns:
    
    the average for the given field amongst objects in query results. This will be of type double for all types of number fields. If no objects exist or they all have null as the value for the given field, 0 will be returned. When computing the average, objects with null values are ignored.
  - remove
```
@Deprecated
public E remove(int index)
```
    Deprecated.
    
    Not supported by RealmResults and OrderedRealmCollectionSnapshot.
    
    Specified by:
    
    remove in interface List<E>
    
    Overrides:
    
    remove in class AbstractList<E>
    
    Throws:
    
    UnsupportedOperationException
  - remove
```
@Deprecated
public boolean remove(Object object)
```
    Deprecated.
    
    Not supported by RealmResults and OrderedRealmCollectionSnapshot.
    
    Specified by:
    
    remove in interface Collection<E>
    
    Specified by:
    
    remove in interface List<E>
    
    Overrides:
    
    remove in class AbstractCollection<E>
    
    Throws:
    
    UnsupportedOperationException
  - removeAll
```
@Deprecated
public boolean removeAll(Collection<?> collection)
```
    Deprecated.
    
    Not supported by RealmResults and OrderedRealmCollectionSnapshot.
    
    Specified by:
    
    removeAll in interface Collection<E>
    
    Specified by:
    
    removeAll in interface List<E>
    
    Overrides:
    
    removeAll in class AbstractCollection<E>
    
    Throws:
    
    UnsupportedOperationException
  - set
```
@Deprecated
public E set(int location,
                         E object)
```
    Deprecated.
    
    Not supported by RealmResults and OrderedRealmCollectionSnapshot.
    
    Specified by:
    
    set in interface List<E>
    
    Overrides:
    
    set in class AbstractList<E>
    
    Throws:
    
    UnsupportedOperationException
  - retainAll
```
@Deprecated
public boolean retainAll(Collection<?> collection)
```
    Deprecated.
    
    Not supported by RealmResults and OrderedRealmCollectionSnapshot.
    
    Specified by:
    
    retainAll in interface Collection<E>
    
    Specified by:
    
    retainAll in interface List<E>
    
    Overrides:
    
    retainAll in class AbstractCollection<E>
    
    Throws:
    
    UnsupportedOperationException
  - clear
```
@Deprecated
public void clear()
```
    Deprecated.
    
    Not supported by RealmResults and OrderedRealmCollectionSnapshot.
    
    Specified by:
    
    clear in interface Collection<E>
    
    Specified by:
    
    clear in interface List<E>
    
    Overrides:
    
    clear in class AbstractList<E>
    
    Throws:
    
    UnsupportedOperationException - always.
  - add
```
@Deprecated
public boolean add(E element)
```
    Deprecated.
    
    Not supported by RealmResults and OrderedRealmCollectionSnapshot.
    
    Specified by:
    
    add in interface Collection<E>
    
    Specified by:
    
    add in interface List<E>
    
    Overrides:
    
    add in class AbstractList<E>
    
    Throws:
    
    UnsupportedOperationException - always.
  - add
```
@Deprecated
public void add(int index,
                            E element)
```
    Deprecated.
    
    Not supported by RealmResults and OrderedRealmCollectionSnapshot.
    
    Specified by:
    
    add in interface List<E>
    
    Overrides:
    
    add in class AbstractList<E>
    
    Throws:
    
    UnsupportedOperationException - always.
  - addAll
```
@Deprecated
public boolean addAll(int location,
                                  Collection<? extends E> collection)
```
    Deprecated.
    
    Not supported by RealmResults and OrderedRealmCollectionSnapshot.
    
    Specified by:
    
    addAll in interface List<E>
    
    Overrides:
    
    addAll in class AbstractList<E>
    
    Throws:
    
    UnsupportedOperationException - always.
  - addAll
```
@Deprecated
public boolean addAll(Collection<? extends E> collection)
```
    Deprecated.
    
    Not supported by RealmResults and OrderedRealmCollectionSnapshot.
    
    Specified by:
    
    addAll in interface Collection<E>
    
    Specified by:
    
    addAll in interface List<E>
    
    Overrides:
    
    addAll in class AbstractCollection<E>
    
    Throws:
    
    UnsupportedOperationException - always.
  - getRealm
```
public Realm getRealm()
```
    Returns the Realm instance to which this collection belongs.
    Calling BaseRealm.close() on the returned instance is discouraged as it is the same as calling it on the original Realm instance which may cause the Realm to fully close invalidating the query result.
    
    Returns:
    
    Realm instance this collection belongs to.
    
    Throws:
    
    IllegalStateException - if the Realm is an instance of DynamicRealm or the Realm was already closed.

Class OrderedRealmCollectionSnapshot<E>

Method Summary

Methods inherited from class java.util.AbstractList

Methods inherited from class java.util.AbstractCollection

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.List

Methods inherited from interface java.util.Collection

Methods inherited from interface java.lang.Iterable

Method Detail

size

sort

sort

sort

sort

where

isLoaded

load

createSnapshot

deleteFromRealm

deleteFirstFromRealm

deleteLastFromRealm

deleteAllFromRealm

isValid

isManaged

contains

get

first

first

last

last

iterator

listIterator

listIterator

min

minDate

max

maxDate

sum

average

remove

remove

removeAll

set

retainAll

clear

add

add

addAll

addAll

getRealm