Package it.unimi.dsi.fastutil.bytes

Class AbstractByte2ByteMap

  • All Implemented Interfaces:
    Byte2ByteFunction, Byte2ByteMap, Function<java.lang.Byte,​java.lang.Byte>, java.io.Serializable, java.util.function.Function<java.lang.Byte,​java.lang.Byte>, java.util.function.IntUnaryOperator, java.util.Map<java.lang.Byte,​java.lang.Byte>
    Direct Known Subclasses:
    AbstractByte2ByteSortedMap, Byte2ByteArrayMap, Byte2ByteOpenCustomHashMap, Byte2ByteOpenHashMap
    public abstract class AbstractByte2ByteMap
extends AbstractByte2ByteFunction
implements Byte2ByteMap, java.io.Serializable
    An abstract class providing basic methods for maps implementing a type-specific interface.

    Optional operations just throw an UnsupportedOperationException. Generic versions of accessors delegate to the corresponding type-specific counterparts following the interface rules (they take care of returning null on a missing key).

    As a further help, this class provides a BasicEntry inner class that implements a type-specific version of Map.Entry; it is particularly useful for those classes that do not implement their own entries (e.g., most immutable maps).

    See Also:
    Serialized Form

    • Method Detail

      • containsKey

        public boolean containsKey​(byte k)
        Returns true if this function contains a mapping for the specified key.
        Specified by:
        containsKey in interface Byte2ByteFunction
        Specified by:
        containsKey in interface Byte2ByteMap
        Parameters:
        k - the key.
        Returns:
        true if this function associates a value to key.
        See Also:
        Map.containsKey(Object)
        Implementation Specification:
        This implementation does a linear search over the entry set, finding an entry that has the key specified.

        If you override keySet(), you should probably override this method too to take advantage of the (presumably) faster key membership test your keySet() provides.

        If you override this method but not keySet(), then the returned key set will take advantage of this method.

      • containsValue

        public boolean containsValue​(byte v)
        Returns true if this map maps one or more keys to the specified value.
        Specified by:
        containsValue in interface Byte2ByteMap
        See Also:
        Map.containsValue(Object)
        Implementation Specification:
        This implementation does a linear search over the entry set, finding an entry that has the value specified.

        If you override values(), you should probably override this method too to take advantage of the (presumably) faster value membership test your values() provides.

        If you override this method but not values(), then the returned values collection will take advantage of this method.

      • isEmpty

        public boolean isEmpty()
        Specified by:
        isEmpty in interface java.util.Map<java.lang.Byte,​java.lang.Byte>

      • keySet

        public ByteSet keySet()
        Returns a type-specific-set view of the keys of this map.

        The view is backed by the set returned by Map.entrySet(). Note that no attempt is made at caching the result of this method, as this would require adding some attributes that lightweight implementations would not need. Subclasses may easily override this policy by calling this method and caching the result, but implementors are encouraged to write more efficient ad-hoc implementations.

        Specified by:
        keySet in interface Byte2ByteMap
        Specified by:
        keySet in interface java.util.Map<java.lang.Byte,​java.lang.Byte>
        Returns:
        a set view of the keys of this map; it may be safely cast to a type-specific interface.
        See Also:
        Map.keySet()

      • values

        public ByteCollection values()
        Returns a type-specific-set view of the values of this map.

        The view is backed by the set returned by Map.entrySet(). Note that no attempt is made at caching the result of this method, as this would require adding some attributes that lightweight implementations would not need. Subclasses may easily override this policy by calling this method and caching the result, but implementors are encouraged to write more efficient ad-hoc implementations.

        Specified by:
        values in interface Byte2ByteMap
        Specified by:
        values in interface java.util.Map<java.lang.Byte,​java.lang.Byte>
        Returns:
        a set view of the values of this map; it may be safely cast to a type-specific interface.
        See Also:
        Map.values()

      • putAll

        public void putAll​(java.util.Map<? extends java.lang.Byte,​? extends java.lang.Byte> m)
        Specified by:
        putAll in interface java.util.Map<java.lang.Byte,​java.lang.Byte>

      • hashCode

        public int hashCode()
        Returns a hash code for this map. The hash code of a map is computed by summing the hash codes of its entries.
        Specified by:
        hashCode in interface java.util.Map<java.lang.Byte,​java.lang.Byte>
        Overrides:
        hashCode in class java.lang.Object
        Returns:
        a hash code for this map.

      • equals

        public boolean equals​(java.lang.Object o)
        Specified by:
        equals in interface java.util.Map<java.lang.Byte,​java.lang.Byte>
        Overrides:
        equals in class java.lang.Object

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object