Package com.google.common.collect

Class LinkedListMultimap<K extends @Nullable Object,​V extends @Nullable Object>

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      Map<K,​Collection<V>> asMap()
      Returns a view of this multimap as a Map from each distinct key to the nonempty collection of that key's associated values.
      void clear()
      Removes all key-value pairs from the multimap, leaving it empty.
      boolean containsEntry​(Object key, Object value)
      Returns true if this multimap contains at least one key-value pair with the key key and the value value.
      boolean containsKey​(Object key)
      Returns true if this multimap contains at least one key-value pair with the key key.
      boolean containsValue​(Object value)
      Returns true if this multimap contains at least one key-value pair with the value value.
      static <K extends @Nullable Object,​V extends @Nullable Object>
      LinkedListMultimap<K,​V>      		 create()
      Creates a new, empty LinkedListMultimap with the default initial capacity.
      static <K extends @Nullable Object,​V extends @Nullable Object>
      LinkedListMultimap<K,​V>      		 create​(int expectedKeys)
      Constructs an empty LinkedListMultimap with enough capacity to hold the specified number of keys without rehashing.
      static <K extends @Nullable Object,​V extends @Nullable Object>
      LinkedListMultimap<K,​V>      		 create​(Multimap<? extends K,​? extends V> multimap)
      Constructs a LinkedListMultimap with the same mappings as the specified Multimap.
      List<Map.Entry<K,​V>> entries()
      Returns a view collection of all key-value pairs contained in this multimap, as Map.Entry instances.
      boolean equals​(Object object)
      Indicates whether some other object is "equal to" this one.
      List<V> get​(K key)
      Returns a view collection of the values associated with key in this multimap, if any.
      int hashCode()
      Returns the hash code for this multimap.
      boolean isEmpty()
      Returns true if this multimap contains no key-value pairs.
      Multiset<K> keys()
      Returns a view collection containing the key from each key-value pair in this multimap, without collapsing duplicates.
      Set<K> keySet()
      Returns a view collection of all distinct keys contained in this multimap.
      boolean put​(K key, V value)
      Stores a key-value pair in the multimap.
      boolean putAll​(Multimap<? extends K,​? extends V> multimap)
      Stores all key-value pairs of multimap in this multimap, in the order returned by multimap.entries().
      boolean putAll​(K key, Iterable<? extends V> values)
      Stores a key-value pair in this multimap for each of values, all using the same key, key.
      boolean remove​(Object key, Object value)
      Removes a single key-value pair with the key key and the value value from this multimap, if such exists.
      List<V> removeAll​(@Nullable Object key)
      Removes all values associated with the key key.
      List<V> replaceValues​(K key, Iterable<? extends V> values)
      Stores a collection of values with the same key, replacing any existing values for that key.
      int size()
      Returns the number of key-value pairs in this multimap.
      String toString()
      Returns a string representation of the multimap, generated by calling toString on the map returned by Multimap.asMap().
      List<V> values()
      Returns a view collection containing the value from each key-value pair contained in this multimap, without collapsing duplicates (so values().size() == size()).

    • Method Detail

      • create

        public static <K extends @Nullable Object,​V extends @Nullable Object> LinkedListMultimap<K,​V> create​(Multimap<? extends K,​? extends V> multimap)
        Constructs a LinkedListMultimap with the same mappings as the specified Multimap. The new multimap has the same Multimap.entries() iteration order as the input multimap.
        Parameters:
        multimap - the multimap whose contents are copied to this multimap

      • size

        public int size()
        Description copied from interface: Multimap
        Returns the number of key-value pairs in this multimap.

        Note: this method does not return the number of distinct keys in the multimap, which is given by keySet().size() or asMap().size(). See the opening section of the Multimap class documentation for clarification.

        Specified by:
        size in interface Multimap<K extends @Nullable Object,​V extends @Nullable Object>

      • isEmpty

        public boolean isEmpty()
        Description copied from interface: Multimap
        Returns true if this multimap contains no key-value pairs. Equivalent to size() == 0, but can in some cases be more efficient.
        Specified by:
        isEmpty in interface Multimap<K extends @Nullable Object,​V extends @Nullable Object>

      • get

        public List<V> get​(K key)
        Returns a view collection of the values associated with key in this multimap, if any. Note that when containsKey(key) is false, this returns an empty collection, not null.

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

        Because the values for a given key may have duplicates and follow the insertion ordering, this method returns a List, instead of the Collection specified in the Multimap interface.

        If the multimap is modified while an iteration over the list is in progress (except through the iterator's own add, set or remove operations) the results of the iteration are undefined.

        The returned list is not serializable and does not have random access.

        Specified by:
        get in interface ListMultimap<K extends @Nullable Object,​V extends @Nullable Object>
        Specified by:
        get in interface Multimap<K extends @Nullable Object,​V extends @Nullable Object>

      • values

        public List<V> values()
        Returns a view collection containing the value from each key-value pair contained in this multimap, without collapsing duplicates (so values().size() == size()).

        Changes to the returned collection will update the underlying multimap, and vice versa. However, adding to the returned collection is not possible.

        The iterator generated by the returned collection traverses the values in the order they were added to the multimap. Because the values may have duplicates and follow the insertion ordering, this method returns a List, instead of the Collection specified in the ListMultimap interface.

        Specified by:
        values in interface Multimap<K extends @Nullable Object,​V extends @Nullable Object>

      • entries

        public List<Map.Entry<K,​V>> entries()
        Returns a view collection of all key-value pairs contained in this multimap, as Map.Entry instances.

        Changes to the returned collection or the entries it contains will update the underlying multimap, and vice versa. However, adding to the returned collection is not possible.

        The iterator generated by the returned collection traverses the entries in the order they were added to the multimap. Because the entries may have duplicates and follow the insertion ordering, this method returns a List, instead of the Collection specified in the ListMultimap interface.

        An entry's Map.Entry.getKey() method always returns the same key, regardless of what happens subsequently. As long as the corresponding key-value mapping is not removed from the multimap, Map.Entry.getValue() returns the value from the multimap, which may change over time, and Map.Entry.setValue(V) modifies that value. Removing the mapping from the multimap does not alter the value returned by getValue(), though a subsequent setValue() call won't update the multimap but will lead to a revised value being returned by getValue().

        Specified by:
        entries in interface Multimap<K extends @Nullable Object,​V extends @Nullable Object>

      • putAll

        @CanIgnoreReturnValue
public boolean putAll​(K key,
                      Iterable<? extends V> values)
        Description copied from interface: Multimap
        Stores a key-value pair in this multimap for each of values, all using the same key, key. Equivalent to (but expected to be more efficient than): 
        
 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 extends @Nullable Object,​V extends @Nullable Object>
        Returns:
        true if the multimap changed

      • keySet

        public Set<K> keySet()
        Description copied from interface: Multimap
        Returns a view collection of all distinct keys contained in this multimap. Note that the key set contains a key if and only if this multimap maps that key to at least one value.

        Changes to the returned set will update the underlying multimap, and vice versa. However, adding to the returned set is not possible.

        Specified by:
        keySet in interface Multimap<K extends @Nullable Object,​V extends @Nullable Object>

      • keys

        public Multiset<K> keys()
        Description copied from interface: Multimap
        Returns a view collection containing the key from each key-value pair in this multimap, without collapsing duplicates. This collection has the same size as this multimap, and keys().count(k) == get(k).size() for all k.

        Changes to the returned multiset will update the underlying multimap, and vice versa. However, adding to the returned collection is not possible.

        Specified by:
        keys in interface Multimap<K extends @Nullable Object,​V extends @Nullable Object>

      • asMap

        public Map<K,​Collection<V>> asMap()
        Description copied from interface: Multimap
        Returns a view of this multimap as a Map from each distinct key to the nonempty collection of that key's associated values. Note that this.asMap().get(k) is equivalent to this.get(k) only when k is a key contained in the multimap; otherwise it returns null as opposed to an empty collection.

        Changes to the returned map or the collections that serve as its values will update the underlying multimap, and vice versa. The map does not support put or putAll, nor do its entries support setValue.

        Specified by:
        asMap in interface Multimap<K extends @Nullable Object,​V extends @Nullable Object>

      • equals

        public boolean equals​(@CheckForNull
                      Object object)
        Description copied from class: java.lang.Object
        Indicates whether some other object is "equal to" this one.

        The equals method implements an equivalence relation on non-null object references:

        • It is reflexive: for any non-null reference value x, x.equals(x) should return true.
        • It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
        • It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
        • It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
        • For any non-null reference value x, x.equals(null) should return false.

        The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

        Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

        Specified by:
        equals in interface Multimap<K extends @Nullable Object,​V extends @Nullable Object>
        Overrides:
        equals in class Object
        Parameters:
        object - the reference object with which to compare.
        Returns:
        true if this object is the same as the obj argument; false otherwise.
        See Also:
        Object.hashCode(), HashMap

      • toString

        public String toString()
        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