Class SingleEntryMap

  • All Implemented Interfaces:
    Callable, MapItem, Function, GroundedValue, Item, Sequence

    public class SingleEntryMap
    extends java.lang.Object
    implements MapItem
    A key and a corresponding value to be held in a Map. A key-value pair also acts as a singleton map in its own right.
    • Method Detail

      • get

        public GroundedValue get​(AtomicValue key)
        Get an entry from the Map
        Specified by:
        get in interface MapItem
        key - the value of the key
        the value associated with the given key, or null if the key is not present in the map.
      • size

        public int size()
        Get the size of the map
        Specified by:
        size in interface MapItem
        the number of keys/entries present in this map
      • isEmpty

        public boolean isEmpty()
        Ask whether the map is empty
        Specified by:
        isEmpty in interface MapItem
        true if and only if the size of the map is zero
      • keys

        public AtomicIterator keys()
        Get the set of all key values in the map.
        Specified by:
        keys in interface MapItem
        a set containing all the key values present in the map, in unpredictable order
      • keyValuePairs

        public java.lang.Iterable<KeyValuePair> keyValuePairs()
        Get the set of all key-value pairs in the map
        Specified by:
        keyValuePairs in interface MapItem
        an iterable containing all the key-value pairs
      • addEntry

        public MapItem addEntry​(AtomicValue key,
                                GroundedValue value)
        Create a new map containing the existing entries in the map plus an additional entry, without modifying the original. If there is already an entry with the specified key, this entry is replaced by the new entry.
        Specified by:
        addEntry in interface MapItem
        key - the key of the new entry
        value - the value associated with the new entry
        the new map containing the additional entry
      • remove

        public MapItem remove​(AtomicValue key)
        Remove an entry from the map
        Specified by:
        remove in interface MapItem
        key - the key of the entry to be removed
        a new map in which the requested entry has been removed; or this map unchanged if the specified key was not present
      • conforms

        public boolean conforms​(AtomicType keyType,
                                SequenceType valueType,
                                TypeHierarchy th)
        Ask whether the map conforms to a given map type
        Specified by:
        conforms in interface MapItem
        keyType - the required keyType
        valueType - the required valueType
        th - the type hierarchy cache for the configuration
        true if the map conforms to the required type
      • getItemType

        public ItemType getItemType​(TypeHierarchy th)
        Get the type of the map. This method is used largely for diagnostics, to report the type of a map when it differs from the required type.
        Specified by:
        getItemType in interface MapItem
        th - the type hierarchy cache
        the type of this map
      • getKeyUType

        public UType getKeyUType()
        Get the lowest common item type of the keys in the map
        Specified by:
        getKeyUType in interface MapItem
        the most specific type to which all the keys belong. If the map is empty, return UType.VOID