Package com.google.common.collect

Class JdkBackedImmutableMultiset<E>

java.lang.Object

java.util.AbstractCollection<E>

com.google.common.collect.ImmutableCollection<E>

com.google.common.collect.ImmutableMultisetGwtSerializationDependencies<E>

com.google.common.collect.ImmutableMultiset<E>

com.google.common.collect.JdkBackedImmutableMultiset<E>

All Implemented Interfaces:

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

final class JdkBackedImmutableMultiset<E>
extends ImmutableMultiset<E>

An implementation of ImmutableMultiset backed by a JDK Map and a list of entries. Used to protect against hash flooding attacks.

Nested Class Summary

Nested classes/interfaces inherited from class com.google.common.collect.ImmutableMultiset

ImmutableMultiset.Builder<E>, ImmutableMultiset.ElementSet<E>, ImmutableMultiset.EntrySetSerializedForm<E>, ImmutableMultiset.SerializedForm

Nested classes/interfaces inherited from interface com.google.common.collect.Multiset

Multiset.Entry<E>

Field Summary

Fields

Modifier and Type	Field	Description
private java.util.Map<E,java.lang.Integer>	delegateMap
private ImmutableSet<E>	elementSet
private ImmutableList<Multiset.Entry<E>>	entries
private long	size

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

SPLITERATOR_CHARACTERISTICS

Constructor Summary

Constructors

Modifier	Constructor	Description
private	JdkBackedImmutableMultiset(java.util.Map<E,java.lang.Integer> delegateMap, ImmutableList<Multiset.Entry<E>> entries, long size)

Method Summary

Modifier and Type	Method	Description
int	count(java.lang.Object element)	Returns the number of occurrences of an element in this multiset (the count of the element).
(package private) static <E> ImmutableMultiset<E>	create(java.util.Collection<? extends Multiset.Entry<? extends E>> entries)
ImmutableSet<E>	elementSet()	Returns the set of distinct elements contained in this multiset.
(package private) Multiset.Entry<E>	getEntry(int index)
(package private) boolean	isPartialView()	Returns true if this immutable collection's implementation contains references to user-created objects that aren't accessible via this collection's methods.
int	size()	Returns the total number of all occurrences of all elements in this multiset.

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

add, asList, builder, contains, copyFromEntries, copyIntoArray, copyOf, copyOf, copyOf, entrySet, equals, hashCode, iterator, of, of, of, of, of, of, of, remove, setCount, setCount, toImmutableMultiset, toImmutableMultiset, toString, writeReplace

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

add, addAll, clear, internalArray, internalArrayEnd, internalArrayStart, remove, removeAll, removeIf, retainAll, spliterator, toArray, toArray

Methods inherited from class java.util.AbstractCollection

containsAll, isEmpty

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

addAll, clear, isEmpty, parallelStream, removeIf, stream, toArray, toArray, toArray

Methods inherited from interface com.google.common.collect.Multiset

add, containsAll, forEach, forEachEntry, remove, removeAll, retainAll, spliterator

Field Detail

delegateMap

private final java.util.Map<E,java.lang.Integer> delegateMap

entries

private final ImmutableList<Multiset.Entry<E>> entries

size

private final long size

elementSet

private transient ImmutableSet<E> elementSet

Constructor Detail

JdkBackedImmutableMultiset

private JdkBackedImmutableMultiset(java.util.Map<E,java.lang.Integer> delegateMap,
                                   ImmutableList<Multiset.Entry<E>> entries,
                                   long size)

Method Detail

create

static <E> ImmutableMultiset<E> create(java.util.Collection<? extends Multiset.Entry<? extends E>> entries)

count

public int count(java.lang.Object element)

Description copied from interface: Multiset

Returns the number of occurrences of an element in this multiset (the count of the element). Note that for an Object.equals(java.lang.Object)-based multiset, this gives the same result as Collections.frequency(java.util.Collection<?>, java.lang.Object) (which would presumably perform more poorly).

Note: the utility method Iterables.frequency(java.lang.Iterable<?>, java.lang.Object) generalizes this operation; it correctly delegates to this method when dealing with a multiset, but it can also accept any other iterable type.

Parameters:

element - the element to count occurrences of

Returns:

the number of occurrences of the element in this multiset; possibly zero but never negative

elementSet

public ImmutableSet<E> elementSet()

Description copied from interface: Multiset

Returns the set of distinct elements contained in this multiset. The element set is backed by the same data as the multiset, so any change to either is immediately reflected in the other. The order of the elements in the element set is unspecified.

If the element set supports any removal operations, these necessarily cause all occurrences of the removed element(s) to be removed from the multiset. Implementations are not expected to support the add operations, although this is possible.

A common use for the element set is to find the number of distinct elements in the multiset: elementSet().size().

Specified by:

elementSet in interface Multiset<E>

Specified by:

elementSet in class ImmutableMultiset<E>

Returns:

a view of the set of distinct elements in this multiset

getEntry

Multiset.Entry<E> getEntry(int index)

Specified by:

getEntry in class ImmutableMultiset<E>

isPartialView

boolean isPartialView()

Description copied from class: ImmutableCollection

Returns true if this immutable collection's implementation contains references to user-created objects that aren't accessible via this collection's methods. This is generally used to determine whether copyOf implementations should make an explicit copy to avoid memory leaks.

Specified by:

isPartialView in class ImmutableCollection<E>

size

public int size()

Description copied from interface: Multiset

Returns the total number of all occurrences of all elements in this multiset.

Note: this method does not return the number of distinct elements in the multiset, which is given by entrySet().size().

Specified by:

size in interface java.util.Collection<E>

Specified by:

size in interface Multiset<E>

Specified by:

size in class java.util.AbstractCollection<E>