Package com.google.common.collect
Class JdkBackedImmutableMultiset<E>
- java.lang.Object
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- java.util.AbstractCollection<E>
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- com.google.common.collect.ImmutableCollection<E>
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- com.google.common.collect.ImmutableMultisetGwtSerializationDependencies<E>
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- com.google.common.collect.ImmutableMultiset<E>
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- com.google.common.collect.JdkBackedImmutableMultiset<E>
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- 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.
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Nested Class Summary
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Nested classes/interfaces inherited from class com.google.common.collect.ImmutableMultiset
ImmutableMultiset.Builder<E>, ImmutableMultiset.ElementSet<E>, ImmutableMultiset.EntrySetSerializedForm<E>, ImmutableMultiset.SerializedForm
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Nested classes/interfaces inherited from interface com.google.common.collect.Multiset
Multiset.Entry<E>
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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
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Fields inherited from class com.google.common.collect.ImmutableCollection
SPLITERATOR_CHARACTERISTICS
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Constructor Summary
Constructors Modifier Constructor Description private
JdkBackedImmutableMultiset(java.util.Map<E,java.lang.Integer> delegateMap, ImmutableList<Multiset.Entry<E>> entries, long size)
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods 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()
Returnstrue
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
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Methods inherited from class com.google.common.collect.ImmutableCollection
add, addAll, clear, internalArray, internalArrayEnd, internalArrayStart, remove, removeAll, removeIf, retainAll, spliterator, toArray, toArray
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Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface java.util.Collection
addAll, clear, isEmpty, parallelStream, removeIf, stream, toArray, toArray, toArray
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Methods inherited from interface com.google.common.collect.Multiset
add, containsAll, forEach, forEachEntry, remove, removeAll, retainAll, spliterator
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Field Detail
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delegateMap
private final java.util.Map<E,java.lang.Integer> delegateMap
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entries
private final ImmutableList<Multiset.Entry<E>> entries
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size
private final long size
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elementSet
@CheckForNull private transient ImmutableSet<E> elementSet
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Constructor Detail
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JdkBackedImmutableMultiset
private JdkBackedImmutableMultiset(java.util.Map<E,java.lang.Integer> delegateMap, ImmutableList<Multiset.Entry<E>> entries, long size)
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Method Detail
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create
static <E> ImmutableMultiset<E> create(java.util.Collection<? extends Multiset.Entry<? extends E>> entries)
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count
public int count(@CheckForNull 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 anObject.equals(java.lang.Object)
-based multiset, this gives the same result asCollections.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
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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 interfaceMultiset<E>
- Specified by:
elementSet
in classImmutableMultiset<E>
- Returns:
- a view of the set of distinct elements in this multiset
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getEntry
Multiset.Entry<E> getEntry(int index)
- Specified by:
getEntry
in classImmutableMultiset<E>
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isPartialView
boolean isPartialView()
Description copied from class:ImmutableCollection
Returnstrue
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 whethercopyOf
implementations should make an explicit copy to avoid memory leaks.- Specified by:
isPartialView
in classImmutableCollection<E>
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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()
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