io.realm

Class RealmResults<E extends RealmObject>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractList<E>

io.realm.RealmResults<E>

Type Parameters:

E - The class of objects in this list

All Implemented Interfaces:

java.lang.Iterable<E>, java.util.Collection<E>, java.util.List<E>

public class RealmResults<E extends RealmObject>
extends java.util.AbstractList<E>

A RealmResults list contains a list of objects of a given type that matches the query. The objects are not copied from the Realm to the RealmResults list, but just references the original objects. This preserves memory and increase speed. It also implies that any modification to any object in a RealmResults is reflected in the objects in the Realm that was queried. Updates to objects must be done within a transaction and the modified object is persisted to the backing Realm file during the commit of the transaction.

See Also:

RealmQuery.findAll(), Realm.allObjects(Class)

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	SORT_ORDER_ASCENDING
static boolean	SORT_ORDER_DESCENDING

Fields inherited from class java.util.AbstractList

modCount

Method Summary

Methods

Modifier and Type	Method and Description
boolean	add(E element) Deprecated.
void	add(int index, E element) Deprecated.
double	average(java.lang.String fieldName) Returns the average of a given field.
void	clear() Removes all objects from the list.
E	first() Get the first object from the list.
E	get(int rowIndex)
java.util.Iterator<E>	iterator() Returns an iterator for the results of a query.
E	last() Get the last object from the list.
java.util.ListIterator<E>	listIterator() Returns a list iterator for the results of a query.
java.util.ListIterator<E>	listIterator(int location) Returns a list iterator on the results of a query.
java.lang.Number	max(java.lang.String fieldName) Find the maximum value of a field.
java.util.Date	maxDate(java.lang.String fieldName) Find the maximum date.
java.lang.Number	min(java.lang.String fieldName) Find the minimum value of a field.
java.util.Date	minDate(java.lang.String fieldName) Find the minimum date.
E	remove(int index) Removes an object at a given index.
void	removeLast() Removes the last object in the list.
int	size()
void	sort(java.lang.String fieldName) Sort (ascending) an existing @{link io.realm.RealmList}.
void	sort(java.lang.String fieldName, boolean sortAscending) Sort existing @{link io.realm.RealmList}.
java.lang.Number	sum(java.lang.String fieldName) Calculate the sum of a given field.
RealmQuery<E>	where() Returns a typed @{link io.realm.RealmQuery}, which can be used to query for specific objects of this type.

Methods inherited from class java.util.AbstractList

addAll, equals, hashCode, indexOf, lastIndexOf, removeRange, set, subList

Methods inherited from class java.util.AbstractCollection

addAll, contains, containsAll, isEmpty, remove, removeAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.List

addAll, contains, containsAll, isEmpty, remove, removeAll, retainAll, toArray, toArray

Field Detail

SORT_ORDER_ASCENDING

public static final boolean SORT_ORDER_ASCENDING

See Also:

Constant Field Values

SORT_ORDER_DESCENDING

public static final boolean SORT_ORDER_DESCENDING

See Also:

Constant Field Values

Method Detail

where

public RealmQuery<E> where()

Returns a typed @{link io.realm.RealmQuery}, which can be used to query for specific objects of this type.

Returns:

A typed RealmQuery

See Also:

RealmQuery

get

public E get(int rowIndex)

Specified by:

get in interface java.util.List<E extends RealmObject>

Specified by:

get in class java.util.AbstractList<E extends RealmObject>

first

public E first()

Get the first object from the list.

Returns:

The first object.

last

public E last()

Get the last object from the list.

Returns:

The last object.

iterator

public java.util.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 java.lang.Iterable<E extends RealmObject>

Specified by:

iterator in interface java.util.Collection<E extends RealmObject>

Specified by:

iterator in interface java.util.List<E extends RealmObject>

Overrides:

iterator in class java.util.AbstractList<E extends RealmObject>

Returns:

an iterator on the elements of this list.

See Also:

Iterator

listIterator

public java.util.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 java.util.List<E extends RealmObject>

Overrides:

listIterator in class java.util.AbstractList<E extends RealmObject>

Returns:

a ListIterator on the elements of this list.

See Also:

ListIterator

listIterator

public java.util.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 java.util.List<E extends RealmObject>

Overrides:

listIterator in class java.util.AbstractList<E extends RealmObject>

Parameters:

location - the index at which to start the iteration.

Returns:

a ListIterator on the elements of this list.

Throws:

java.lang.IndexOutOfBoundsException - if location < 0 || location > size()

See Also:

ListIterator

sort

public void sort(java.lang.String fieldName)

Sort (ascending) an existing @{link io.realm.RealmList}.

Parameters:

fieldName - The field name to sort by. Only fields of type boolean, short, int, long, float, double, Date, and String are supported.

Throws:

java.lang.IllegalArgumentException - if field name does not exist.

sort

public void sort(java.lang.String fieldName,
        boolean sortAscending)

Sort existing @{link io.realm.RealmList}.

Parameters:

fieldName - The field name to sort by. Only fields of type boolean, short, int, long, float, double, Date, and String are supported.

sortAscending - The direction to sort by; if true ascending, otherwise descending You can use the constants SORT_ORDER_ASCENDING and SORT_ORDER_DESCENDING for readability.

Throws:

java.lang.IllegalArgumentException - if field name does not exist.

size

public int size()

Specified by:

size in interface java.util.Collection<E extends RealmObject>

Specified by:

size in interface java.util.List<E extends RealmObject>

Specified by:

size in class java.util.AbstractCollection<E extends RealmObject>

min

public java.lang.Number min(java.lang.String fieldName)

Find the minimum value of a field.

Parameters:

fieldName - The field to look for a minimum on. Only int, float, and double are supported.

Returns:

The minimum value.

Throws:

java.lang.IllegalArgumentException - if field is not int, float or double.

minDate

public java.util.Date minDate(java.lang.String fieldName)

Find the minimum date.

Parameters:

fieldName - The field to look for the minimum date. If fieldName is not of Date type, an exception is thrown.

Returns:

The minimum date.

Throws:

java.lang.IllegalArgumentException - if fieldName is not a Date field.

max

public java.lang.Number max(java.lang.String fieldName)

Find the maximum value of a field.

Parameters:

fieldName - The field to look for a maximum on. Only int, float, and double are supported.

Returns:

The maximum value.

Throws:

java.lang.IllegalArgumentException - if field is not int, float or double.

maxDate

public java.util.Date maxDate(java.lang.String fieldName)

Find the maximum date.

Parameters:

fieldName - The field to look for the maximum date. If fieldName is not of Date type, an exception is thrown.

Returns:

The maximum date.

Throws:

java.lang.IllegalArgumentException - if fieldName is not a Date field.

sum

public java.lang.Number sum(java.lang.String fieldName)

Calculate the sum of a given field.

Parameters:

fieldName - The field to sum. Only int, float, and double are supported.

Returns:

The sum.

Throws:

java.lang.IllegalArgumentException - if field is not int, float or double.

average

public double average(java.lang.String fieldName)

Returns the average of a given field.

Parameters:

fieldName - The field to calculate average on. Only properties of type int, float and double are supported.

Returns:

The average for the given field amongst objects in an RealmList. This will be of type double for both float and double field.

Throws:

java.lang.IllegalArgumentException - if field is not int, float or double.

remove

public E remove(int index)

Removes an object at a given index.

Specified by:

remove in interface java.util.List<E extends RealmObject>

Overrides:

remove in class java.util.AbstractList<E extends RealmObject>

Parameters:

index - The array index identifying the object to be removed.

Returns:

Always return null.

removeLast

public void removeLast()

Removes the last object in the list.

clear

public void clear()

Removes all objects from the list.

Specified by:

clear in interface java.util.Collection<E extends RealmObject>

Specified by:

clear in interface java.util.List<E extends RealmObject>

Overrides:

clear in class java.util.AbstractList<E extends RealmObject>

add

@Deprecated
public boolean add(E element)

Deprecated.

Specified by:

add in interface java.util.Collection<E extends RealmObject>

Specified by:

add in interface java.util.List<E extends RealmObject>

Overrides:

add in class java.util.AbstractList<E extends RealmObject>

add

@Deprecated
public void add(int index,
                  E element)

Deprecated.

Specified by:

add in interface java.util.List<E extends RealmObject>

Overrides:

add in class java.util.AbstractList<E extends RealmObject>