Package it.unimi.dsi.fastutil.ints

Interface Int2ObjectMap<V>

All Superinterfaces:
Function<Integer,​V>, Function<Integer,​V>, Int2ObjectFunction<V>, IntFunction<V>, Map<Integer,​V>
All Known Subinterfaces:
Int2ObjectSortedMap<V>
All Known Implementing Classes:
AbstractInt2ObjectMap, AbstractInt2ObjectSortedMap, Int2ObjectArrayMap, Int2ObjectAVLTreeMap, Int2ObjectLinkedOpenHashMap, Int2ObjectMaps.EmptyMap, Int2ObjectMaps.Singleton, Int2ObjectMaps.SynchronizedMap, Int2ObjectMaps.UnmodifiableMap, Int2ObjectOpenCustomHashMap, Int2ObjectOpenHashMap, Int2ObjectRBTreeMap, Int2ObjectSortedMaps.EmptySortedMap, Int2ObjectSortedMaps.Singleton, Int2ObjectSortedMaps.SynchronizedSortedMap, Int2ObjectSortedMaps.UnmodifiableSortedMap
public interface Int2ObjectMap<V>
extends Int2ObjectFunction<V>, Map<Integer,​V>
A type-specific Map; provides some additional methods that use polymorphism to avoid (un)boxing, and handling of a default return value.

Besides extending the corresponding type-specific function, this interface strengthens Map.entrySet(), keySet() and values(). Moreover, a number of methods, such as size(), defaultReturnValue(), etc., are un-defaulted as their function default do not make sense for a map. Maps returning entry sets of type Int2ObjectMap.FastEntrySet support also fast iteration.

A submap or subset may or may not have an independent default return value (which however must be initialized to the default return value of the originator).

See Also:
Map

  • Nested Class Summary

    Nested Classes 
    Modifier and Type Interface Description
    static interface  Int2ObjectMap.Entry<V>
    A type-specific Map.Entry; provides some additional methods that use polymorphism to avoid (un)boxing.
    static interface  Int2ObjectMap.FastEntrySet<V>
    An entry set providing fast iteration.

  • Method Summary

    Modifier and Type Method Description
    default void clear()
    Removes all of the mappings from this map (optional operation).
    default V compute​(int key, BiFunction<? super Integer,​? super V,​? extends V> remappingFunction)
    Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).
    default V compute​(Integer key, BiFunction<? super Integer,​? super V,​? extends V> remappingFunction)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default V computeIfAbsent​(int key, IntFunction<? extends V> mappingFunction)
    If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map.
    default V computeIfAbsent​(Integer key, Function<? super Integer,​? extends V> mappingFunction)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default V computeIfAbsentPartial​(int key, Int2ObjectFunction<? extends V> mappingFunction)
    If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map, unless the key is not present in the given mapping function.
    default V computeIfPresent​(int key, BiFunction<? super Integer,​? super V,​? extends V> remappingFunction)
    If the value for the specified key is present, attempts to compute a new mapping given the key and its current mapped value.
    default V computeIfPresent​(Integer key, BiFunction<? super Integer,​? super V,​? extends V> remappingFunction)
    Deprecated.
    Please use the corresponding type-specific method instead.
    boolean containsKey​(int key)
    Returns true if this function contains a mapping for the specified key.
    default boolean containsKey​(Object key)
    Deprecated.
    Please use the corresponding type-specific method instead.
    V defaultReturnValue()
    Gets the default return value.
    void defaultReturnValue​(V rv)
    Sets the default return value (optional operation).
    default ObjectSet<Map.Entry<Integer,​V>> entrySet()
    Deprecated.
    Please use the corresponding type-specific method instead.
    default V get​(Object key)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default V getOrDefault​(int key, V defaultValue)
    Returns the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.
    default V getOrDefault​(Object key, V defaultValue)
    Deprecated.
    Please use the corresponding type-specific method instead.
    ObjectSet<Int2ObjectMap.Entry<V>> int2ObjectEntrySet()
    Returns a type-specific set view of the mappings contained in this map.
    IntSet keySet()
    default V merge​(int key, V value, BiFunction<? super V,​? super V,​? extends V> remappingFunction)
    If the specified key is not already associated with a value or is associated with null, associates it with the given non-null value.
    default V merge​(Integer key, V value, BiFunction<? super V,​? super V,​? extends V> remappingFunction)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default V put​(Integer key, V value)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default V putIfAbsent​(int key, V value)
    If the specified key is not already associated with a value, associates it with the given value and returns the default return value, else returns the current value.
    default V putIfAbsent​(Integer key, V value)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default boolean remove​(int key, Object value)
    Removes the entry for the specified key only if it is currently mapped to the specified value.
    default V remove​(Object key)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default boolean remove​(Object key, Object value)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default V replace​(int key, V value)
    Replaces the entry for the specified key only if it is currently mapped to some value.
    default boolean replace​(int key, V oldValue, V newValue)
    Replaces the entry for the specified key only if currently mapped to the specified value.
    default V replace​(Integer key, V value)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default boolean replace​(Integer key, V oldValue, V newValue)
    Deprecated.
    Please use the corresponding type-specific method instead.
    int size()
    Returns the number of key/value mappings in this map.
    ObjectCollection<V> values()

    Methods inherited from interface it.unimi.dsi.fastutil.Function

    apply

    Methods inherited from interface java.util.function.Function

    andThen, compose

    Methods inherited from interface it.unimi.dsi.fastutil.ints.Int2ObjectFunction

    apply, get, put, remove

    Methods inherited from interface java.util.Map

    containsValue, equals, forEach, hashCode, isEmpty, putAll, replaceAll

  • Method Details

    • size

      int size()
      Returns the number of key/value mappings in this map. If the map contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.
      Specified by:
      size in interface Function<Integer,​V>
      Specified by:
      size in interface Map<Integer,​V>
      Returns:
      the number of key-value mappings in this map.
      See Also:
      Size64

    • clear

      default void clear()
      Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.
      Specified by:
      clear in interface Function<Integer,​V>
      Specified by:
      clear in interface Map<Integer,​V>
      Throws:
      UnsupportedOperationException - if the clear() operation is not supported by this map
      See Also:
      Map.clear()

    • defaultReturnValue

      void defaultReturnValue​(V rv)
      Sets the default return value (optional operation). This value must be returned by type-specific versions of get(), put() and remove() to denote that the map does not contain the specified key. It must be null by default.

      Warning: Changing this to a non-null value can have unforeseen consequences. Especially, it breaks compatibility with the specifications of Java's Map interface. It has to be used with great care and thorough study of all method comments is recommended.

      Specified by:
      defaultReturnValue in interface Int2ObjectFunction<V>
      Parameters:
      rv - the new default return value.
      See Also:
      defaultReturnValue()

    • defaultReturnValue

      V defaultReturnValue()
      Gets the default return value.
      Specified by:
      defaultReturnValue in interface Int2ObjectFunction<V>
      Returns:
      the current default return value.

    • int2ObjectEntrySet

      ObjectSet<Int2ObjectMap.Entry<V>> int2ObjectEntrySet()
      Returns a type-specific set view of the mappings contained in this map.

      This method is necessary because there is no inheritance along type parameters: it is thus impossible to strengthen Map.entrySet() so that it returns an ObjectSet of type-specific entries (the latter makes it possible to access keys and values with type-specific methods).

      Returns:
      a type-specific set view of the mappings contained in this map.
      See Also:
      Map.entrySet()

    • entrySet

      @Deprecated default ObjectSet<Map.Entry<Integer,​V>> entrySet()
      Deprecated.
      Please use the corresponding type-specific method instead.
      Returns a set view of the mappings contained in this map.

      Note that this specification strengthens the one given in Map.entrySet().

      Specified by:
      entrySet in interface Map<Integer,​V>
      Returns:
      a set view of the mappings contained in this map.
      See Also:
      Map.entrySet()

    • put

      @Deprecated default V put​(Integer key, V value)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Associates the specified value with the specified key in this function (optional operation).

      This default implementation just delegates to the corresponding type-specific–function method.

      Specified by:
      put in interface Function<Integer,​V>
      Specified by:
      put in interface Int2ObjectFunction<V>
      Specified by:
      put in interface Map<Integer,​V>
      Parameters:
      key - the key.
      value - the value.
      Returns:
      the old value, or null if no value was present for the given key.
      See Also:
      Map.put(Object,Object)

    • get

      @Deprecated default V get​(Object key)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Returns the value associated by this function to the specified key.

      This default implementation just delegates to the corresponding type-specific–function method.

      Specified by:
      get in interface Function<Integer,​V>
      Specified by:
      get in interface Int2ObjectFunction<V>
      Specified by:
      get in interface Map<Integer,​V>
      Parameters:
      key - the key.
      Returns:
      the corresponding value, or null if no value was present for the given key.
      See Also:
      Map.get(Object)

    • remove

      @Deprecated default V remove​(Object key)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Removes this key and the associated value from this function if it is present (optional operation).

      This default implementation just delegates to the corresponding type-specific–function method.

      Specified by:
      remove in interface Function<Integer,​V>
      Specified by:
      remove in interface Int2ObjectFunction<V>
      Specified by:
      remove in interface Map<Integer,​V>
      Parameters:
      key - the key.
      Returns:
      the old value, or null if no value was present for the given key.
      See Also:
      Map.remove(Object)

    • keySet

      IntSet keySet()

      Note that this specification strengthens the one given in Map.keySet().

      Specified by:
      keySet in interface Map<Integer,​V>
      Returns:
      a set view of the keys contained in this map.
      See Also:
      Map.keySet()

    • values

      ObjectCollection<V> values()

      Note that this specification strengthens the one given in Map.values().

      Specified by:
      values in interface Map<Integer,​V>
      Returns:
      a set view of the values contained in this map.
      See Also:
      Map.values()

    • containsKey

      boolean containsKey​(int key)
      Returns true if this function contains a mapping for the specified key.
      Specified by:
      containsKey in interface Int2ObjectFunction<V>
      Parameters:
      key - the key.
      Returns:
      true if this function associates a value to key.
      See Also:
      Map.containsKey(Object)

    • containsKey

      @Deprecated default boolean containsKey​(Object key)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Returns true if this function contains a mapping for the specified key.

      This default implementation just delegates to the corresponding type-specific–function method.

      Specified by:
      containsKey in interface Function<Integer,​V>
      Specified by:
      containsKey in interface Int2ObjectFunction<V>
      Specified by:
      containsKey in interface Map<Integer,​V>
      Parameters:
      key - the key.
      Returns:
      true if this function associates a value to key.
      See Also:
      Map.containsKey(Object)

    • getOrDefault

      default V getOrDefault​(int key, V defaultValue)
      Returns the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.
      Parameters:
      key - the key.
      defaultValue - the default mapping of the key.
      Returns:
      the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.
      Since:
      8.0.0
      See Also:
      Map.getOrDefault(Object, Object)

    • putIfAbsent

      default V putIfAbsent​(int key, V value)
      If the specified key is not already associated with a value, associates it with the given value and returns the default return value, else returns the current value.
      Parameters:
      key - key with which the specified value is to be associated.
      value - value to be associated with the specified key.
      Returns:
      the previous value associated with the specified key, or the default return value if there was no mapping for the key.
      Since:
      8.0.0
      See Also:
      Map.putIfAbsent(Object, Object)

    • remove

      default boolean remove​(int key, Object value)
      Removes the entry for the specified key only if it is currently mapped to the specified value.
      Parameters:
      key - key with which the specified value is associated.
      value - value expected to be associated with the specified key.
      Returns:
      true if the value was removed.
      Since:
      8.0.0
      See Also:
      Map.remove(Object, Object)

    • replace

      default boolean replace​(int key, V oldValue, V newValue)
      Replaces the entry for the specified key only if currently mapped to the specified value.
      Parameters:
      key - key with which the specified value is associated.
      oldValue - value expected to be associated with the specified key.
      newValue - value to be associated with the specified key.
      Returns:
      true if the value was replaced.
      Since:
      8.0.0
      See Also:
      Map.replace(Object, Object, Object)

    • replace

      default V replace​(int key, V value)
      Replaces the entry for the specified key only if it is currently mapped to some value.
      Parameters:
      key - key with which the specified value is associated.
      value - value to be associated with the specified key.
      Returns:
      the previous value associated with the specified key, or the default return value if there was no mapping for the key.
      Since:
      8.0.0
      See Also:
      Map.replace(Object, Object)

    • computeIfAbsent

      default V computeIfAbsent​(int key, IntFunction<? extends V> mappingFunction)
      If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map.

      Note that contrarily to the default computeIfAbsent(), it is not possible to not add a value for a given key, since the mappingFunction cannot return null. If such a behavior is needed, please use the corresponding nullable version.

      Parameters:
      key - key with which the specified value is to be associated.
      mappingFunction - the function to compute a value.
      Returns:
      the current (existing or computed) value associated with the specified key.
      Since:
      8.0.0
      See Also:
      Map.computeIfAbsent(Object, java.util.function.Function)

    • computeIfAbsentPartial

      default V computeIfAbsentPartial​(int key, Int2ObjectFunction<? extends V> mappingFunction)
      If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map, unless the key is not present in the given mapping function.

      This version of computeIfAbsent() uses a type-specific version of fastutil's Function. Since Function has a containsKey() method, it is possible to avoid adding a key by having containsKey() return false for that key.

      Parameters:
      key - key with which the specified value is to be associated.
      mappingFunction - the function to compute a value.
      Returns:
      the current (existing or computed) value associated with the specified key.
      Since:
      8.0.0
      See Also:
      Map.computeIfAbsent(Object, java.util.function.Function)

    • computeIfPresent

      default V computeIfPresent​(int key, BiFunction<? super Integer,​? super V,​? extends V> remappingFunction)
      If the value for the specified key is present, attempts to compute a new mapping given the key and its current mapped value.
      Parameters:
      key - key with which the specified value is to be associated.
      remappingFunction - the function to compute a value.
      Returns:
      the new value associated with the specified key, or the default return value if none.
      Since:
      8.0.0
      See Also:
      Map.computeIfPresent(Object, java.util.function.BiFunction)

    • compute

      default V compute​(int key, BiFunction<? super Integer,​? super V,​? extends V> remappingFunction)
      Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).

      If the function returns null, the mapping is removed (or remains absent if initially absent). If the function itself throws an (unchecked) exception, the exception is rethrown, and the current mapping is left unchanged.

      Parameters:
      key - key with which the specified value is to be associated.
      remappingFunction - the function to compute a value.
      Returns:
      the new value associated with the specified key, or the default return value if none.
      Since:
      8.0.0
      See Also:
      Map.compute(Object, java.util.function.BiFunction)

    • merge

      default V merge​(int key, V value, BiFunction<? super V,​? super V,​? extends V> remappingFunction)
      If the specified key is not already associated with a value or is associated with null, associates it with the given non-null value. Otherwise, replaces the associated value with the results of the given remapping function, or removes if the result is null.
      Parameters:
      key - key with which the resulting value is to be associated.
      value - the non-null value to be merged with the existing value associated with the key or, if no existing value is associated with the key, to be associated with the key.
      remappingFunction - the function to recompute a value if present.
      Returns:
      the new value associated with the specified key, or the default return value if no value is associated with the key.
      Since:
      8.0.0
      See Also:
      Map.merge(Object, Object, java.util.function.BiFunction)

    • getOrDefault

      @Deprecated default V getOrDefault​(Object key, V defaultValue)
      Deprecated.
      Please use the corresponding type-specific method instead.

      This default implementation just delegates to the corresponding Map method.

      Specified by:
      getOrDefault in interface Map<Integer,​V>

    • putIfAbsent

      @Deprecated default V putIfAbsent​(Integer key, V value)
      Deprecated.
      Please use the corresponding type-specific method instead.

      This default implementation just delegates to the corresponding Map method.

      Specified by:
      putIfAbsent in interface Map<Integer,​V>

    • remove

      @Deprecated default boolean remove​(Object key, Object value)
      Deprecated.
      Please use the corresponding type-specific method instead.

      This default implementation just delegates to the corresponding Map method.

      Specified by:
      remove in interface Map<Integer,​V>

    • replace

      @Deprecated default boolean replace​(Integer key, V oldValue, V newValue)
      Deprecated.
      Please use the corresponding type-specific method instead.

      This default implementation just delegates to the corresponding Map method.

      Specified by:
      replace in interface Map<Integer,​V>

    • replace

      @Deprecated default V replace​(Integer key, V value)
      Deprecated.
      Please use the corresponding type-specific method instead.

      This default implementation just delegates to the corresponding Map method.

      Specified by:
      replace in interface Map<Integer,​V>

    • computeIfAbsent

      @Deprecated default V computeIfAbsent​(Integer key, Function<? super Integer,​? extends V> mappingFunction)
      Deprecated.
      Please use the corresponding type-specific method instead.

      This default implementation just delegates to the corresponding Map method.

      Specified by:
      computeIfAbsent in interface Map<Integer,​V>

    • computeIfPresent

      @Deprecated default V computeIfPresent​(Integer key, BiFunction<? super Integer,​? super V,​? extends V> remappingFunction)
      Deprecated.
      Please use the corresponding type-specific method instead.

      This default implementation just delegates to the corresponding Map method.

      Specified by:
      computeIfPresent in interface Map<Integer,​V>

    • compute

      @Deprecated default V compute​(Integer key, BiFunction<? super Integer,​? super V,​? extends V> remappingFunction)
      Deprecated.
      Please use the corresponding type-specific method instead.

      This default implementation just delegates to the corresponding Map method.

      Specified by:
      compute in interface Map<Integer,​V>

    • merge

      @Deprecated default V merge​(Integer key, V value, BiFunction<? super V,​? super V,​? extends V> remappingFunction)
      Deprecated.
      Please use the corresponding type-specific method instead.

      This default implementation just delegates to the corresponding Map method.

      Specified by:
      merge in interface Map<Integer,​V>