Package com.google.common.collect

Class HashMultimap<K,V>

java.lang.Object
com.google.common.collect.HashMultimap<K,V>
All Implemented Interfaces:
Multimap<K,V>, SetMultimap<K,V>, Serializable
@GwtCompatible(serializable=true, emulated=true) @Deprecated(since="2022-12-01") public final class HashMultimap<K,V> extends Object
Deprecated.
The Google Guava Core Libraries are deprecated and will not be part of the AEM SDK after April 2023
Implementation of Multimap using hash tables.

The multimap does not store duplicate key-value pairs. Adding a new key-value pair equal to an existing key-value pair has no effect.

Keys and values may be null. All optional multimap methods are supported, and all returned views are modifiable.

This class is not threadsafe when any concurrent operations update the multimap. Concurrent read operations will work correctly. To allow concurrent update operations, wrap your multimap with a call to Multimaps.synchronizedSetMultimap(com.google.common.collect.SetMultimap<K, V>).

Since:
2.0 (imported from Google Collections Library)
See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    Map<K,Collection<V>>
    asMap()
    Deprecated.
    Returns a map view that associates each key with the corresponding values in the multimap.
    void
    clear()
    Deprecated.
    Removes all key-value pairs from the multimap.
    boolean
    containsEntry(Object key, Object value)
    Deprecated.
    Returns true if the multimap contains the specified key-value pair.
    boolean
    containsKey(Object key)
    Deprecated.
    Returns true if the multimap contains any values for the specified key.
    boolean
    containsValue(Object value)
    Deprecated.
    Returns true if the multimap contains the specified value for any key.
    static <K, V> HashMultimap<K,V>
    create()
    Deprecated.
    Creates a new, empty HashMultimap with the default initial capacities.
    static <K, V> HashMultimap<K,V>
    create(int expectedKeys, int expectedValuesPerKey)
    Deprecated.
    Constructs an empty HashMultimap with enough capacity to hold the specified numbers of keys and values without rehashing.
    static <K, V> HashMultimap<K,V>
    create(Multimap<? extends K,? extends V> multimap)
    Deprecated.
    Constructs a HashMultimap with the same mappings as the specified multimap.
    Set<Map.Entry<K,V>>
    entries()
    Deprecated.
    Returns a collection of all key-value pairs.
    boolean
    equals(Object object)
    Deprecated.
    Compares the specified object to this multimap for equality.
    Set<V>
    get(K key)
    Deprecated.
    Returns a collection view containing the values associated with key in this multimap, if any.
    int
    hashCode()
    Deprecated.
    Returns the hash code for this multimap.
    boolean
    isEmpty()
    Deprecated.
    Returns true if the multimap contains no key-value pairs.
    Multiset<K>
    keys()
    Deprecated.
    Returns a collection, which may contain duplicates, of all keys.
    Set<K>
    keySet()
    Deprecated.
    Returns the set of all keys, each appearing once in the returned set.
    boolean
    put(K key, V value)
    Deprecated.
    Stores a key-value pair in the multimap.
    boolean
    putAll(Multimap<? extends K,? extends V> multimap)
    Deprecated.
    Copies all of another multimap's key-value pairs into this multimap.
    boolean
    putAll(K key, Iterable<? extends V> values)
    Deprecated.
    Stores key-value pairs in this multimap with one key and multiple values.
    boolean
    remove(Object key, Object value)
    Deprecated.
    Removes a single key-value pair from the multimap.
    Set<V>
    removeAll(Object key)
    Deprecated.
    Removes all values associated with a given key.
    Set<V>
    replaceValues(K key, Iterable<? extends V> values)
    Deprecated.
    Stores a collection of values with the same key, replacing any existing values for that key.
    int
    size()
    Deprecated.
    Returns the number of key-value pairs in the multimap.
    String
    toString()
    Deprecated.
    Returns a string representation of the multimap, generated by calling toString on the map returned by Multimap.asMap().
    Collection<V>
    values()
    Deprecated.
    Returns a collection of all values in the multimap.

    Methods inherited from class java.lang.Object

    getClass, notify, notifyAll, wait, wait, wait

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

    clear, containsEntry, containsKey, containsValue, hashCode, isEmpty, keys, keySet, putAll, putAll, remove, size, values

  • Method Details

    • create

      public static <K, V> HashMultimap<K,V> create()
      Deprecated.
      Creates a new, empty HashMultimap with the default initial capacities.

    • create

      public static <K, V> HashMultimap<K,V> create(int expectedKeys, int expectedValuesPerKey)
      Deprecated.
      Constructs an empty HashMultimap with enough capacity to hold the specified numbers of keys and values without rehashing.
      Parameters:
      expectedKeys - the expected number of distinct keys
      expectedValuesPerKey - the expected average number of values per key
      Throws:
      IllegalArgumentException - if expectedKeys or expectedValuesPerKey is negative

    • create

      public static <K, V> HashMultimap<K,V> create(Multimap<? extends K,? extends V> multimap)
      Deprecated.
      Constructs a HashMultimap with the same mappings as the specified multimap. If a key-value mapping appears multiple times in the input multimap, it only appears once in the constructed multimap.
      Parameters:
      multimap - the multimap whose contents are copied to this multimap

    • get

      public Set<V> get(@Nullable K key)
      Deprecated.
      Returns a collection view containing the values associated with key in this multimap, if any. Note that even when (containsKey(key) is false, get(key) still returns an empty collection, not null.

      Changes to the returned collection will update the underlying multimap, and vice versa.

      The returned collection is not serializable.

      Because a SetMultimap has unique values for a given key, this method returns a Set, instead of the Collection specified in the Multimap interface.

      Specified by:
      get in interface Multimap<K,V>
      Specified by:
      get in interface SetMultimap<K,V>
      Parameters:
      key - key to search for in multimap
      Returns:
      a view collection containing the zero or more values that the key maps to

    • entries

      public Set<Map.Entry<K,V>> entries()
      Deprecated.
      Returns a collection of all key-value pairs. Changes to the returned collection will update the underlying multimap, and vice versa. The entries collection does not support the add or addAll operations.

      The iterator generated by the returned collection traverses the values for one key, followed by the values of a second key, and so on.

      Each entry is an immutable snapshot of a key-value mapping in the multimap, taken at the time the entry is returned by a method call to the collection or its iterator.

      Because a SetMultimap has unique values for a given key, this method returns a Set, instead of the Collection specified in the Multimap interface.

      Specified by:
      entries in interface Multimap<K,V>
      Specified by:
      entries in interface SetMultimap<K,V>
      Returns:
      collection of map entries consisting of key-value pairs

    • removeAll

      public Set<V> removeAll(@Nullable Object key)
      Deprecated.
      Removes all values associated with a given key.

      Once this method returns, key will not be mapped to any values, so it will not appear in Multimap.keySet(), Multimap.asMap(), or any other views.

      The returned collection is immutable.

      Because a SetMultimap has unique values for a given key, this method returns a Set, instead of the Collection specified in the Multimap interface.

      Specified by:
      removeAll in interface Multimap<K,V>
      Specified by:
      removeAll in interface SetMultimap<K,V>
      Parameters:
      key - key of entries to remove from the multimap
      Returns:
      the collection of removed values, or an empty collection if no values were associated with the provided key. The collection may be modifiable, but updating it will have no effect on the multimap.

    • replaceValues

      public Set<V> replaceValues(@Nullable K key, Iterable<? extends V> values)
      Deprecated.
      Stores a collection of values with the same key, replacing any existing values for that key.

      If values is empty, this is equivalent to removeAll(key).

      The returned collection is immutable.

      Because a SetMultimap has unique values for a given key, this method returns a Set, instead of the Collection specified in the Multimap interface.

      Any duplicates in values will be stored in the multimap once.

      Specified by:
      replaceValues in interface Multimap<K,V>
      Specified by:
      replaceValues in interface SetMultimap<K,V>
      Parameters:
      key - key to store in the multimap
      values - values to store in the multimap
      Returns:
      the collection of replaced values, or an empty collection if no values were previously associated with the key. The collection may be modifiable, but updating it will have no effect on the multimap.

    • asMap

      public Map<K,Collection<V>> asMap()
      Deprecated.
      Returns a map view that associates each key with the corresponding values in the multimap. Changes to the returned map, such as element removal, will update the underlying multimap. The map does not support setValue() on its entries, put, or putAll.

      When passed a key that is present in the map, asMap().get(Object) has the same behavior as Multimap.get(K), returning a live collection. When passed a key that is not present, however, asMap().get(Object) returns null instead of an empty collection.

      Though the method signature doesn't say so explicitly, the returned map has Set values.

      Specified by:
      asMap in interface Multimap<K,V>
      Specified by:
      asMap in interface SetMultimap<K,V>
      Returns:
      a map view from a key to its collection of values

    • put

      public boolean put(@Nullable K key, @Nullable V value)
      Deprecated.
      Stores a key-value pair in the multimap.
      Specified by:
      put in interface Multimap<K,V>
      Parameters:
      key - key to store in the multimap
      value - value to store in the multimap
      Returns:
      true if the method increased the size of the multimap, or false if the multimap already contained the key-value pair

    • equals

      public boolean equals(@Nullable Object object)
      Deprecated.
      Compares the specified object to this multimap for equality.

      Two SetMultimap instances are equal if, for each key, they contain the same values. Equality does not depend on the ordering of keys or values.

      Specified by:
      equals in interface Multimap<K,V>
      Specified by:
      equals in interface SetMultimap<K,V>

    • size

      public int size()
      Deprecated.
      Description copied from interface: Multimap
      Returns the number of key-value pairs in the multimap.
      Specified by:
      size in interface Multimap<K,V>

    • containsKey

      public boolean containsKey(@Nullable Object key)
      Deprecated.
      Description copied from interface: Multimap
      Returns true if the multimap contains any values for the specified key.
      Specified by:
      containsKey in interface Multimap<K,V>
      Parameters:
      key - key to search for in multimap

    • clear

      public void clear()
      Deprecated.
      Description copied from interface: Multimap
      Removes all key-value pairs from the multimap.
      Specified by:
      clear in interface Multimap<K,V>

    • values

      public Collection<V> values()
      Deprecated.
      Returns a collection of all values in the multimap. Changes to the returned collection will update the underlying multimap, and vice versa.

      The iterator generated by the returned collection traverses the values for one key, followed by the values of a second key, and so on.

      Specified by:
      values in interface Multimap<K,V>
      Returns:
      collection of values, which may include the same value multiple times if it occurs in multiple mappings

    • isEmpty

      public boolean isEmpty()
      Deprecated.
      Description copied from interface: Multimap
      Returns true if the multimap contains no key-value pairs.
      Specified by:
      isEmpty in interface Multimap<K,V>

    • containsValue

      public boolean containsValue(@Nullable Object value)
      Deprecated.
      Description copied from interface: Multimap
      Returns true if the multimap contains the specified value for any key.
      Specified by:
      containsValue in interface Multimap<K,V>
      Parameters:
      value - value to search for in multimap

    • containsEntry

      public boolean containsEntry(@Nullable Object key, @Nullable Object value)
      Deprecated.
      Description copied from interface: Multimap
      Returns true if the multimap contains the specified key-value pair.
      Specified by:
      containsEntry in interface Multimap<K,V>
      Parameters:
      key - key to search for in multimap
      value - value to search for in multimap

    • remove

      public boolean remove(@Nullable Object key, @Nullable Object value)
      Deprecated.
      Description copied from interface: Multimap
      Removes a single key-value pair from the multimap.
      Specified by:
      remove in interface Multimap<K,V>
      Parameters:
      key - key of entry to remove from the multimap
      value - value of entry to remove the multimap
      Returns:
      true if the multimap changed

    • putAll

      public boolean putAll(@Nullable K key, Iterable<? extends V> values)
      Deprecated.
      Description copied from interface: Multimap
      Stores key-value pairs in this multimap with one key and multiple values.

      This is equivalent to 

         

   for (V value : values) {
     put(key, value);
   }

      In particular, this is a no-op if values is empty.

      Specified by:
      putAll in interface Multimap<K,V>
      Parameters:
      key - key to store in the multimap
      values - values to store in the multimap
      Returns:
      true if the multimap changed

    • putAll

      public boolean putAll(Multimap<? extends K,? extends V> multimap)
      Deprecated.
      Description copied from interface: Multimap
      Copies all of another multimap's key-value pairs into this multimap. The order in which the mappings are added is determined by multimap.entries().
      Specified by:
      putAll in interface Multimap<K,V>
      Parameters:
      multimap - mappings to store in this multimap
      Returns:
      true if the multimap changed

    • keySet

      public Set<K> keySet()
      Deprecated.
      Description copied from interface: Multimap
      Returns the set of all keys, each appearing once in the returned set. Changes to the returned set will update the underlying multimap, and vice versa.

      Note that the key set contains a key if and only if this multimap maps that key to at least one value.

      Specified by:
      keySet in interface Multimap<K,V>
      Returns:
      the collection of distinct keys

    • keys

      public Multiset<K> keys()
      Deprecated.
      Description copied from interface: Multimap
      Returns a collection, which may contain duplicates, of all keys. The number of times of key appears in the returned multiset equals the number of mappings the key has in the multimap. Changes to the returned multiset will update the underlying multimap, and vice versa.
      Specified by:
      keys in interface Multimap<K,V>
      Returns:
      a multiset with keys corresponding to the distinct keys of the multimap and frequencies corresponding to the number of values that each key maps to

    • hashCode

      public int hashCode()
      Deprecated.
      Returns the hash code for this multimap.

      The hash code of a multimap is defined as the hash code of the map view, as returned by Multimap.asMap().

      Specified by:
      hashCode in interface Multimap<K,V>
      Overrides:
      hashCode in class Object
      See Also:

    • toString

      public String toString()
      Deprecated.
      Returns a string representation of the multimap, generated by calling toString on the map returned by Multimap.asMap().
      Overrides:
      toString in class Object
      Returns:
      a string representation of the multimap