Package it.unimi.dsi.fastutil.doubles

Interface Double2DoubleMap

All Superinterfaces:
Double2DoubleFunction, DoubleUnaryOperator, Function<Double,Double>, Function<Double,Double>, Map<Double,Double>
All Known Subinterfaces:
Double2DoubleSortedMap
All Known Implementing Classes:
AbstractDouble2DoubleMap, AbstractDouble2DoubleSortedMap, Double2DoubleArrayMap, Double2DoubleAVLTreeMap, Double2DoubleLinkedOpenHashMap, Double2DoubleMaps.EmptyMap, Double2DoubleMaps.Singleton, Double2DoubleMaps.SynchronizedMap, Double2DoubleMaps.UnmodifiableMap, Double2DoubleOpenCustomHashMap, Double2DoubleOpenHashMap, Double2DoubleRBTreeMap, Double2DoubleSortedMaps.EmptySortedMap, Double2DoubleSortedMaps.Singleton, Double2DoubleSortedMaps.SynchronizedSortedMap, Double2DoubleSortedMaps.UnmodifiableSortedMap
public interface Double2DoubleMap extends Double2DoubleFunction, Map<Double,Double>
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 Double2DoubleMap.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:

  • 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<Double,Double>
      Specified by:
      size in interface Map<Double,Double>
      Returns:
      the number of key-value mappings in this map.
      See Also:

    • 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<Double,Double>
      Specified by:
      clear in interface Map<Double,Double>
      Throws:
      UnsupportedOperationException - if the clear() operation is not supported by this map
      See Also:

    • defaultReturnValue

      void defaultReturnValue(double 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 0/false by default.
      Specified by:
      defaultReturnValue in interface Double2DoubleFunction
      Parameters:
      rv - the new default return value.
      See Also:

    • defaultReturnValue

      double defaultReturnValue()
      Gets the default return value.
      Specified by:
      defaultReturnValue in interface Double2DoubleFunction
      Returns:
      the current default return value.

    • double2DoubleEntrySet

      ObjectSet<Double2DoubleMap.Entry> double2DoubleEntrySet()
      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:

    • entrySet

      @Deprecated default ObjectSet<Map.Entry<Double,Double>> entrySet()
      Deprecated.
      Please use the corresponding type-specific method instead.
      Returns a set view of the mappings contained in this map.
      Specified by:
      entrySet in interface Map<Double,Double>
      Returns:
      a set view of the mappings contained in this map.
      See Also:
      API Notes:
      Note that this specification strengthens the one given in Map.entrySet().

    • put

      @Deprecated default Double put(Double key, Double 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 Double2DoubleFunction
      Specified by:
      put in interface Function<Double,Double>
      Specified by:
      put in interface Map<Double,Double>
      Parameters:
      key - the key.
      value - the value.
      Returns:
      the old value, or null if no value was present for the given key.
      See Also:

    • get

      @Deprecated default Double 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 Double2DoubleFunction
      Specified by:
      get in interface Function<Double,Double>
      Specified by:
      get in interface Map<Double,Double>
      Parameters:
      key - the key.
      Returns:
      the corresponding value, or null if no value was present for the given key.
      See Also:

    • remove

      @Deprecated default Double 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 Double2DoubleFunction
      Specified by:
      remove in interface Function<Double,Double>
      Specified by:
      remove in interface Map<Double,Double>
      Parameters:
      key - the key.
      Returns:
      the old value, or null if no value was present for the given key.
      See Also:

    • keySet

      DoubleSet keySet()
      Specified by:
      keySet in interface Map<Double,Double>
      Returns:
      a set view of the keys contained in this map.
      See Also:
      API Notes:
      Note that this specification strengthens the one given in Map.keySet().

    • values

      DoubleCollection values()
      Specified by:
      values in interface Map<Double,Double>
      Returns:
      a set view of the values contained in this map.
      See Also:
      API Notes:
      Note that this specification strengthens the one given in Map.values().

    • containsKey

      boolean containsKey(double key)
      Returns true if this function contains a mapping for the specified key.
      Specified by:
      containsKey in interface Double2DoubleFunction
      Parameters:
      key - the key.
      Returns:
      true if this function associates a value to key.
      See Also:

    • 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 Double2DoubleFunction
      Specified by:
      containsKey in interface Function<Double,Double>
      Specified by:
      containsKey in interface Map<Double,Double>
      Parameters:
      key - the key.
      Returns:
      true if this function associates a value to key.
      See Also:

    • containsValue

      boolean containsValue(double value)
      Returns true if this map maps one or more keys to the specified value.
      See Also:

    • containsValue

      @Deprecated default boolean containsValue(Object value)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Specified by:
      containsValue in interface Map<Double,Double>

    • forEach

      default void forEach(BiConsumer<? super Double,? super Double> consumer)
      Specified by:
      forEach in interface Map<Double,Double>

    • getOrDefault

      default double getOrDefault(double key, double defaultValue)
      Returns the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.
      Specified by:
      getOrDefault in interface Double2DoubleFunction
      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:

    • getOrDefault

      @Deprecated default Double getOrDefault(Object key, Double defaultValue)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Returns the value associated by this function to the specified key, or give the specified value if not present.

      This default implementation just delegates to the corresponding Map method.

      Specified by:
      getOrDefault in interface Double2DoubleFunction
      Specified by:
      getOrDefault in interface Function<Double,Double>
      Specified by:
      getOrDefault in interface Map<Double,Double>
      Parameters:
      key - the key.
      defaultValue - the default value to return if not present.
      Returns:
      the corresponding value, or defaultValue if no value was present for the given key.
      See Also:

    • putIfAbsent

      default double putIfAbsent(double key, double 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:

    • remove

      default boolean remove(double key, double 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:

    • replace

      default boolean replace(double key, double oldValue, double 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:

    • replace

      default double replace(double key, double 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:

    • computeIfAbsent

      default double computeIfAbsent(double key, DoubleUnaryOperator 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:
      API Notes:
      all computeIfAbsent() methods have a different logic based on the argument; no delegation is performed, contrarily to other superficially similar methods such as Iterator.forEachRemaining(java.util.function.Consumer<? super E>) or List.replaceAll(java.util.function.UnaryOperator<E>).

    • computeIfAbsentNullable

      default double computeIfAbsentNullable(double key, DoubleFunction<? extends Double> 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 it is null.

      Note that this version of computeIfAbsent() should be used only if you plan to return null in the mapping function.

      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, or the default return value if the computed value is null.
      Since:
      8.0.0
      See Also:

    • computeIfAbsent

      default double computeIfAbsent(double key, Double2DoubleFunction 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:
      API Notes:
      all computeIfAbsent() methods have a different logic based on the argument; no delegation is performed, contrarily to other superficially similar methods such as Iterator.forEachRemaining(java.util.function.Consumer<? super E>) or List.replaceAll(java.util.function.UnaryOperator<E>).

    • computeIfAbsentPartial

      @Deprecated default double computeIfAbsentPartial(double key, Double2DoubleFunction mappingFunction)
      Deprecated.
      Please use computeIfAbsent() instead.

    • computeIfPresent

      default double computeIfPresent(double key, BiFunction<? super Double,? super Double,? extends Double> 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:
      API Notes:
      The JDK specification for this method equates not being associated with a value with being associated with {code null}. This is not the case for this method.

    • compute

      default double compute(double key, BiFunction<? super Double,? super Double,? extends Double> 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:

    • merge

      default double merge(double key, double value, BiFunction<? super Double,? super Double,? extends Double> remappingFunction)
      If the specified key is not already associated with a value, associates it with the given 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 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:
      API Notes:
      The JDK specification for this method equates not being associated with a value with being associated with {code null}. This is not the case for this method.

    • mergeDouble

      default double mergeDouble(double key, double value, DoubleBinaryOperator remappingFunction)
      If the specified key is not already associated with a value, associates it with the given value. Otherwise, replaces the associated value with the results of the given remapping function.
      Parameters:
      key - key with which the resulting value is to be associated.
      value - the 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.
      Since:
      8.5.0
      See Also:
      API Notes:
      The JDK specification for this method equates not being associated with a value with being associated with {code null}. This is not the case for this method. Moreover, this method cannot delete entries as the type-specific remapping function cannot return null.

    • mergeDouble

      default double mergeDouble(double key, double value, DoubleBinaryOperator remappingFunction)
      If the specified key is not already associated with a value, associates it with the given value. Otherwise, replaces the associated value with the results of the given remapping function.
      Parameters:
      key - key with which the resulting value is to be associated.
      value - the 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.
      Since:
      8.5.1
      See Also:
      API Notes:
      The JDK specification for this method equates not being associated with a value with being associated with {code null}. This is not the case for this method. Moreover, this method cannot delete entries as the type-specific remapping function cannot return null.

      WARNING: Overriding this method is almost always a mistake, as this overload only exists to disambiguate. Instead, override the overload that uses the JDK's primitive binary operator (e.g. IntBinaryOperator).

      If Java supported final default methods, this would be one, but sadly it does not.

      If you checked and are overriding the version with java.util.function.XBinaryOperator, and still see this warning, then your IDE is incorrectly conflating this method with the proper method to override, and you can safely ignore this message.

    • putIfAbsent

      @Deprecated default Double putIfAbsent(Double key, Double 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<Double,Double>

    • 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<Double,Double>

    • replace

      @Deprecated default boolean replace(Double key, Double oldValue, Double 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<Double,Double>

    • replace

      @Deprecated default Double replace(Double key, Double 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<Double,Double>

    • computeIfAbsent

      @Deprecated default Double computeIfAbsent(Double key, Function<? super Double,? extends Double> 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<Double,Double>

    • computeIfPresent

      @Deprecated default Double computeIfPresent(Double key, BiFunction<? super Double,? super Double,? extends Double> 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<Double,Double>

    • compute

      @Deprecated default Double compute(Double key, BiFunction<? super Double,? super Double,? extends Double> 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<Double,Double>

    • merge

      @Deprecated default Double merge(Double key, Double value, BiFunction<? super Double,? super Double,? extends Double> 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<Double,Double>