java.util.AbstractCollection<E>
com.google.common.collect.TreeMultiset<E>
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java.lang.Object
@GwtCompatible(emulated=true) public final class TreeMultiset<E>
A multiset which maintains the ordering of its elements, according to either their natural order
or an explicit Comparator. In all cases, this implementation uses
Comparable.compareTo(T) or Comparator.compare(T, T) instead of Object.equals(java.lang.Object) to
determine equivalence of instances.
Warning: The comparison must be consistent with equals as explained by the
Comparable class specification. Otherwise, the resulting multiset will violate the
Collection contract, which is specified in terms of Object.equals(java.lang.Object).
See the Guava User Guide article on
Multiset.
| Nested Class Summary |
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| Nested classes/interfaces inherited from interface com.google.common.collect.Multiset |
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Multiset.Entry<E> |
| Method Summary | ||
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boolean |
add(E element)
Adds a single occurrence of the specified element to this multiset. |
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int |
add(E element,
int occurrences)
Adds a number of occurrences of an element to this multiset. |
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boolean |
addAll(Collection<? extends E> elementsToAdd)
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void |
clear()
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Comparator<? super E> |
comparator()
Returns the comparator that orders this multiset, or Ordering.natural() if the natural ordering of the elements is used. |
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boolean |
contains(Object element)
Determines whether this multiset contains the specified element. |
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int |
count(Object element)
Returns the number of occurrences of an element in this multiset (the count of the element). |
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static
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create()
Creates a new, empty multiset, sorted according to the elements' natural order. |
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static
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create(Comparator<? super E> comparator)
Creates a new, empty multiset, sorted according to the specified comparator. |
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static
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create(Iterable<? extends E> elements)
Creates an empty multiset containing the given initial elements, sorted according to the elements' natural order. |
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SortedMultiset<E> |
descendingMultiset()
Returns a descending view of this multiset. |
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SortedSet<E> |
elementSet()
Returns the set of distinct elements contained in this multiset. |
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Set<Multiset.Entry<E>> |
entrySet()
Returns a view of the contents of this multiset, grouped into Multiset.Entry instances, each providing an element of the multiset and
the count of that element. |
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boolean |
equals(Object object)
Compares the specified object with this multiset for equality. |
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Multiset.Entry<E> |
firstEntry()
Returns the entry of the first element in this multiset, or null if
this multiset is empty. |
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int |
hashCode()
Returns the hash code for this multiset. |
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SortedMultiset<E> |
headMultiset(E upperBound,
BoundType boundType)
Returns a view of this multiset restricted to the elements less than upperBound, optionally including upperBound itself. |
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boolean |
isEmpty()
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Iterator<E> |
iterator()
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Multiset.Entry<E> |
lastEntry()
Returns the entry of the last element in this multiset, or null if
this multiset is empty. |
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Multiset.Entry<E> |
pollFirstEntry()
Returns and removes the entry associated with the lowest element in this multiset, or returns null if this multiset is empty. |
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Multiset.Entry<E> |
pollLastEntry()
Returns and removes the entry associated with the greatest element in this multiset, or returns null if this multiset is empty. |
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boolean |
remove(Object element)
Removes a single occurrence of the specified element from this multiset, if present. |
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int |
remove(Object element,
int occurrences)
Removes a number of occurrences of the specified element from this multiset. |
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boolean |
removeAll(Collection<?> elementsToRemove)
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boolean |
retainAll(Collection<?> elementsToRetain)
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int |
setCount(E element,
int count)
Adds or removes the necessary occurrences of an element such that the element attains the desired count. |
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boolean |
setCount(E element,
int oldCount,
int newCount)
Conditionally sets the count of an element to a new value, as described in Multiset.setCount(Object, int), provided that the element has the expected
current count. |
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int |
size()
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SortedMultiset<E> |
subMultiset(E fromElement,
BoundType fromBoundType,
E toElement,
BoundType toBoundType)
Returns a view of this multiset restricted to the range between lowerBound and upperBound. |
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SortedMultiset<E> |
tailMultiset(E lowerBound,
BoundType boundType)
Returns a view of this multiset restricted to the elements greater than lowerBound, optionally including lowerBound itself. |
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String |
toString()
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| Methods inherited from class java.util.AbstractCollection |
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containsAll, toArray, toArray |
| Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Methods inherited from interface com.google.common.collect.SortedMultiset |
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iterator |
| Methods inherited from interface com.google.common.collect.Multiset |
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add, contains, containsAll, entrySet, equals, hashCode, remove, removeAll, retainAll, toString |
| Methods inherited from interface java.util.Collection |
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addAll, clear, isEmpty, toArray, toArray |
| Method Detail |
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public static <E extends Comparable> TreeMultiset<E> create()
Comparable interface. Furthermore, all
such elements must be mutually comparable: e1.compareTo(e2) must not throw a
ClassCastException for any elements e1 and e2 in the multiset. If the
user attempts to add an element to the multiset that violates this constraint (for example,
the user attempts to add a string element to a set whose elements are integers), the
add(Object) call will throw a ClassCastException.
The type specification is <E extends Comparable>, instead of the more specific
<E extends Comparable<? super E>>, to support classes defined without generics.
public static <E> TreeMultiset<E> create(@Nullable
Comparator<? super E> comparator)
comparator.compare(e1,
e2) must not throw a ClassCastException for any elements e1 and e2 in
the multiset. If the user attempts to add an element to the multiset that violates this
constraint, the add(Object) call will throw a ClassCastException.
comparator - the comparator that will be used to sort this multiset. A null value indicates that
the elements' natural ordering should be used.public static <E extends Comparable> TreeMultiset<E> create(Iterable<? extends E> elements)
This implementation is highly efficient when elements is itself a Multiset.
The type specification is <E extends Comparable>, instead of the more specific
<E extends Comparable<? super E>>, to support classes defined without generics.
public int size()
size in interface Collection<E>
public int count(@Nullable
Object element)
MultisetObject.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.
count in interface Multiset<E>element - the element to count occurrences of
public int add(@Nullable
E element,
int occurrences)
Multisetoccurrences == 1, this method has the identical effect to Multiset.add(Object). This method is functionally equivalent (except in the case
of overflow) to the call addAll(Collections.nCopies(element,
occurrences)), which would presumably perform much more poorly.
add in interface Multiset<E>element - the element to add occurrences of; may be null only if
explicitly allowed by the implementationoccurrences - the number of occurrences of the element to add. May be
zero, in which case no change will be made.
public int remove(@Nullable
Object element,
int occurrences)
Multisetoccurrences == 1, this is functionally equivalent to the call
remove(element).
remove in interface Multiset<E>element - the element to conditionally remove occurrences ofoccurrences - the number of occurrences of the element to remove. May
be zero, in which case no change will be made.
public int setCount(@Nullable
E element,
int count)
Multiset
setCount in interface Multiset<E>element - the element to add or remove occurrences of; may be null
only if explicitly allowed by the implementationcount - the desired count of the element in this multiset
public boolean setCount(@Nullable
E element,
int oldCount,
int newCount)
MultisetMultiset.setCount(Object, int), provided that the element has the expected
current count. If the current count is not oldCount, no change is
made.
setCount in interface Multiset<E>element - the element to conditionally set the count of; may be null
only if explicitly allowed by the implementationoldCount - the expected present count of the element in this multisetnewCount - the desired count of the element in this multiset
true if the condition for modification was met. This
implies that the multiset was indeed modified, unless
oldCount == newCount.
public SortedMultiset<E> headMultiset(@Nullable
E upperBound,
BoundType boundType)
SortedMultisetupperBound, optionally including upperBound itself. The
returned multiset is a view of this multiset, so changes to one will be
reflected in the other. The returned multiset supports all operations that
this multiset supports.
The returned multiset will throw an IllegalArgumentException on
attempts to add elements outside its range.
headMultiset in interface SortedMultiset<E>
public SortedMultiset<E> tailMultiset(@Nullable
E lowerBound,
BoundType boundType)
SortedMultisetlowerBound, optionally including lowerBound itself. The
returned multiset is a view of this multiset, so changes to one will be
reflected in the other. The returned multiset supports all operations that
this multiset supports.
The returned multiset will throw an IllegalArgumentException on
attempts to add elements outside its range.
tailMultiset in interface SortedMultiset<E>public SortedSet<E> elementSet()
MultisetIf 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().
elementSet in interface Multiset<E>elementSet in interface SortedMultiset<E>public Comparator<? super E> comparator()
SortedMultisetOrdering.natural() if the natural ordering of the elements is used.
comparator in interface SortedMultiset<E>public Multiset.Entry<E> firstEntry()
SortedMultisetnull if
this multiset is empty.
firstEntry in interface SortedMultiset<E>public Multiset.Entry<E> lastEntry()
SortedMultisetnull if
this multiset is empty.
lastEntry in interface SortedMultiset<E>public Multiset.Entry<E> pollFirstEntry()
SortedMultisetnull if this multiset is empty.
pollFirstEntry in interface SortedMultiset<E>public Multiset.Entry<E> pollLastEntry()
SortedMultisetnull if this multiset is empty.
pollLastEntry in interface SortedMultiset<E>
public SortedMultiset<E> subMultiset(@Nullable
E fromElement,
BoundType fromBoundType,
@Nullable
E toElement,
BoundType toBoundType)
SortedMultisetlowerBound and upperBound. The returned multiset is a view
of this multiset, so changes to one will be reflected in the other. The
returned multiset supports all operations that this multiset supports.
The returned multiset will throw an IllegalArgumentException on
attempts to add elements outside its range.
This method is equivalent to
tailMultiset(lowerBound, lowerBoundType).headMultiset(upperBound,
upperBoundType).
subMultiset in interface SortedMultiset<E>public SortedMultiset<E> descendingMultiset()
SortedMultiset
descendingMultiset in interface SortedMultiset<E>public boolean isEmpty()
isEmpty in interface Collection<E>isEmpty in class AbstractCollection<E>
public boolean contains(@Nullable
Object element)
MultisetThis method refines Collection.contains(java.lang.Object) to further specify that
it may not throw an exception in response to element being
null or of the wrong type.
contains in interface Multiset<E>contains in interface Collection<E>contains in class AbstractCollection<E>element - the element to check for
true if this multiset contains at least one occurrence of
the elementpublic Iterator<E> iterator()
MultisetElements that occur multiple times in the multiset will appear multiple times in this iterator, though not necessarily sequentially.
iterator in interface Multiset<E>iterator in interface Iterable<E>iterator in interface Collection<E>iterator in class AbstractCollection<E>
public boolean add(@Nullable
E element)
MultisetThis method refines Collection.add(E), which only ensures
the presence of the element, to further specify that a successful call must
always increment the count of the element, and the overall size of the
collection, by one.
add in interface Multiset<E>add in interface Collection<E>add in class AbstractCollection<E>element - the element to add one occurrence of; may be null only if
explicitly allowed by the implementation
true always, since this call is required to modify the
multiset, unlike other Collection types
public boolean remove(@Nullable
Object element)
MultisetThis method refines Collection.remove(java.lang.Object) to further specify that it
may not throw an exception in response to element being null
or of the wrong type.
remove in interface Multiset<E>remove in interface Collection<E>remove in class AbstractCollection<E>element - the element to remove one occurrence of
true if an occurrence was found and removedpublic boolean addAll(Collection<? extends E> elementsToAdd)
This implementation is highly efficient when elementsToAdd
is itself a Multiset.
addAll in interface Collection<E>addAll in class AbstractCollection<E>public boolean removeAll(Collection<?> elementsToRemove)
MultisetNote: This method ignores how often any element might appear in
c, and only cares whether or not an element appears at all.
If you wish to remove one occurrence in this multiset for every occurrence
in c, see Multisets.removeOccurrences(Multiset, Multiset).
This method refines Collection.removeAll(java.util.Collection) to further specify that
it may not throw an exception in response to any of elements
being null or of the wrong type.
removeAll in interface Multiset<E>removeAll in interface Collection<E>removeAll in class AbstractCollection<E>public boolean retainAll(Collection<?> elementsToRetain)
MultisetNote: This method ignores how often any element might appear in
c, and only cares whether or not an element appears at all.
If you wish to remove one occurrence in this multiset for every occurrence
in c, see Multisets.retainOccurrences(Multiset, Multiset).
This method refines Collection.retainAll(java.util.Collection) to further specify that
it may not throw an exception in response to any of elements
being null or of the wrong type.
retainAll in interface Multiset<E>retainAll in interface Collection<E>retainAll in class AbstractCollection<E>Multisets.retainOccurrences(Multiset, Multiset)public void clear()
clear in interface Collection<E>clear in class AbstractCollection<E>public Set<Multiset.Entry<E>> entrySet()
MultisetMultiset.Entry instances, each providing an element of the multiset and
the count of that element. This set contains exactly one entry for each
distinct element in the multiset (thus it always has the same size as the
Multiset.elementSet()). The order of the elements in the element set is
unspecified.
The entry set is backed by the same data as the multiset, so any change
to either is immediately reflected in the other. However, multiset changes
may or may not be reflected in any Entry instances already
retrieved from the entry set (this is implementation-dependent).
Furthermore, implementations are not required to support modifications to
the entry set at all, and the Entry instances themselves don't
even have methods for modification. See the specific implementation class
for more details on how its entry set handles modifications.
entrySet in interface Multiset<E>
public boolean equals(@Nullable
Object object)
true if the given object is also a multiset and contains equal
elements with equal counts, regardless of order.
This implementation returns true if object is a multiset
of the same size and if, for each element, the two multisets have the same
count.
equals in interface Multiset<E>equals in interface Collection<E>equals in class Objectpublic int hashCode()
((element == null) ? 0 : element.hashCode()) ^ count(element)
over all distinct elements in the multiset. It follows that a multiset and
its entry set always have the same hash code.
This implementation returns the hash code of Multiset.entrySet().
hashCode in interface Multiset<E>hashCode in interface Collection<E>hashCode in class Objectpublic String toString()
It is recommended, though not mandatory, that this method return the
result of invoking Multiset.toString() on the Multiset.entrySet(), yielding a
result such as [a x 3, c, d x 2, e].
This implementation returns the result of invoking toString on
Multiset.entrySet().
toString in interface Multiset<E>toString in class AbstractCollection<E>
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