com.google.common.collect
Class ImmutableList<E>

java.lang.Object
  com.google.common.collect.ImmutableCollection<E>
      com.google.common.collect.ImmutableList<E>

All Implemented Interfaces:

java.io.Serializable, java.lang.Iterable<E>, java.util.Collection<E>, java.util.List<E>, java.util.RandomAccess

public abstract class ImmutableList<E>
extends ImmutableCollection<E>
implements java.util.List<E>, java.util.RandomAccess

A high-performance, immutable, random-access List implementation. Does not permit null elements.

Unlike Collections.unmodifiableList(java.util.List), which is a view of a separate collection that can still change, an instance of ImmutableList contains its own private data and will never change. ImmutableList is convenient for public static final lists ("constant lists") and also lets you easily make a "defensive copy" of a list provided to your class by a caller.

Note: Although this class is not final, it cannot be subclassed as it has no public or protected constructors. Thus, instances of this type are guaranteed to be immutable.

Author:

Kevin Bourrillion

See Also:

ImmutableMap, ImmutableSet, Serialized Form

Method Summary

void	add(int index, E element) Guaranteed to throw an exception and leave the list unmodified.
boolean	addAll(int index, java.util.Collection<? extends E> newElements) Guaranteed to throw an exception and leave the list unmodified.
static <E> ImmutableList<E>	copyOf(java.lang.Iterable<? extends E> elements) Returns an immutable list containing the given elements, in order.
abstract int	indexOf(java.lang.Object object)
abstract int	lastIndexOf(java.lang.Object object)
static <E> ImmutableList<E>	of() Returns the empty immutable list.
static <E> ImmutableList<E>	of(E... elements) Returns an immutable list containing the given elements, in order.
static <E> ImmutableList<E>	of(E element) Returns an immutable list containing a single element.
E	remove(int index) Guaranteed to throw an exception and leave the list unmodified.
E	set(int index, E element) Guaranteed to throw an exception and leave the list unmodified.
abstract ImmutableList<E>	subList(int fromIndex, int toIndex) Returns an immutable list of the elements between the specified fromIndex, inclusive, and toIndex, exclusive.

Methods inherited from class com.google.common.collect.ImmutableCollection

add, addAll, clear, contains, containsAll, remove, removeAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.List

add, addAll, clear, contains, containsAll, equals, get, hashCode, isEmpty, iterator, listIterator, listIterator, remove, removeAll, retainAll, size, toArray, toArray

Method Detail

of

public static <E> ImmutableList<E> of()

Returns the empty immutable list. This set behaves and performs comparably to Collections.emptyList(), and is preferable mainly for consistency and maintainability of your code.

of

public static <E> ImmutableList<E> of(E element)

Returns an immutable list containing a single element. This list behaves and performs comparably to Collections.singleton(T), but will not accept a null element. It is preferable mainly for consistency and maintainability of your code.

of

public static <E> ImmutableList<E> of(E... elements)

Returns an immutable list containing the given elements, in order.

Throws:

java.lang.NullPointerException - if any of elements is null

copyOf

public static <E> ImmutableList<E> copyOf(java.lang.Iterable<? extends E> elements)

Returns an immutable list containing the given elements, in order. Note that if list is a List<String>, then ImmutableList.copyOf(list) returns an ImmutableList<String> containing each of the strings in list, while ImmutableList.of(list)} returns an ImmutableList<List<String>> containing one element (the given list itself).

Note: Despite what the method name suggests, if elements is an ImmutableList, no copy will actually be performed, and the given list itself will be returned.

Throws:

java.lang.NullPointerException - if any of elements are null

indexOf

public abstract int indexOf(@Nullable
                            java.lang.Object object)

Specified by:

indexOf in interface java.util.List<E>

lastIndexOf

public abstract int lastIndexOf(@Nullable
                                java.lang.Object object)

Specified by:

lastIndexOf in interface java.util.List<E>

subList

public abstract ImmutableList<E> subList(int fromIndex,
                                         int toIndex)

Returns an immutable list of the elements between the specified fromIndex, inclusive, and toIndex, exclusive. (If fromIndex and toIndex are equal, the empty immutable list is returned.)

Specified by:

subList in interface java.util.List<E>

addAll

public final boolean addAll(int index,
                            java.util.Collection<? extends E> newElements)

Guaranteed to throw an exception and leave the list unmodified.

Specified by:

addAll in interface java.util.List<E>

Throws:

java.lang.UnsupportedOperationException - always

set

public final E set(int index,
                   E element)

Guaranteed to throw an exception and leave the list unmodified.

Specified by:

set in interface java.util.List<E>

Throws:

java.lang.UnsupportedOperationException - always

add

public final void add(int index,
                      E element)

Guaranteed to throw an exception and leave the list unmodified.

Specified by:

add in interface java.util.List<E>

Throws:

java.lang.UnsupportedOperationException - always

remove

public final E remove(int index)

Guaranteed to throw an exception and leave the list unmodified.

Specified by:

remove in interface java.util.List<E>

Throws:

java.lang.UnsupportedOperationException - always