Class HashMap<K,​V>

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable, java.util.Map<K,​V>, SCO<java.util.HashMap<K,​V>>, SCOContainer<java.util.HashMap<K,​V>>, SCOMap<java.util.HashMap<K,​V>,​K,​V>, BackedSCO

    public class HashMap<K,​V>
    extends HashMap<K,​V>
    implements BackedSCO
    A mutable second-class HashMap object. Backed by a MapStore object.
    See Also:
    Serialized Form
    • Nested Class Summary

      • Nested classes/interfaces inherited from class java.util.AbstractMap

        java.util.AbstractMap.SimpleEntry<K extends java.lang.Object,​V extends java.lang.Object>, java.util.AbstractMap.SimpleImmutableEntry<K extends java.lang.Object,​V extends java.lang.Object>
      • Nested classes/interfaces inherited from interface java.util.Map

        java.util.Map.Entry<K extends java.lang.Object,​V extends java.lang.Object>
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void clear()
      Method to clear the HashMap.
      java.lang.Object clone()
      Creates and returns a copy of this object.
      boolean containsKey​(java.lang.Object key)
      Method to return if the map contains this key
      boolean containsValue​(java.lang.Object value)
      Method to return if the map contains this value.
      java.util.Set entrySet()
      Accessor for the set of entries in the Map.
      boolean equals​(java.lang.Object o)  
      void forEach​(java.util.function.BiConsumer<? super K,​? super V> action)  
      V get​(java.lang.Object key)
      Accessor for the value stored against a key.
      Store getBackingStore()  
      java.util.HashMap getValue()
      Accessor for the unwrapped value that we are wrapping.
      int hashCode()  
      void initialise()
      Method to initialise the SCO for use.
      void initialise​(java.util.HashMap m)
      Method to initialise the SCO from an existing value.
      void initialise​(java.util.HashMap newValue, java.lang.Object oldValue)
      Method to initialise the SCO for use, where replacing an old value with a new value such as when calling a setter field passing in a new value.
      boolean isEmpty()
      Method to return if the Map is empty.
      boolean isLoaded()
      Method to return if the SCO has its contents loaded.
      java.util.Set keySet()
      Accessor for the set of keys in the Map.
      void load()
      Method to effect the load of the data in the SCO.
      protected void loadFromStore()
      Method to load all elements from the "backing store" where appropriate.
      V put​(K key, V value)
      Method to add a value against a key to the HashMap.
      void putAll​(java.util.Map m)
      Method to add the specified Map's values under their keys here.
      V remove​(java.lang.Object key)
      Method to remove the value for a key from the HashMap.
      int size()
      Method to return the size of the Map.
      void unsetOwner()
      Method to unset the owner and field details.
      void updateEmbeddedKey​(K key, int fieldNumber, java.lang.Object newValue, boolean makeDirty)
      Method to update an embedded key in this map.
      void updateEmbeddedValue​(V value, int fieldNumber, java.lang.Object newValue, boolean makeDirty)
      Method to update an embedded value in this map.
      java.util.Collection values()
      Accessor for the set of values in the Map.
      protected java.lang.Object writeReplace()
      The writeReplace method is called when ObjectOutputStream is preparing to write the object to the stream.
      • Methods inherited from class java.util.HashMap

        compute, computeIfAbsent, computeIfPresent, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll
      • Methods inherited from class java.util.AbstractMap

        toString
      • Methods inherited from class java.lang.Object

        finalize, getClass, notify, notifyAll, wait, wait, wait
    • Field Detail

      • allowNulls

        protected transient boolean allowNulls
      • backingStore

        protected transient MapStore<K,​V> backingStore
      • useCache

        protected transient boolean useCache
      • isCacheLoaded

        protected transient boolean isCacheLoaded
    • Method Detail

      • initialise

        public void initialise​(java.util.HashMap newValue,
                               java.lang.Object oldValue)
        Description copied from interface: SCO
        Method to initialise the SCO for use, where replacing an old value with a new value such as when calling a setter field passing in a new value. Note that oldValue is marked as Object since for cases where the member type is Collection the newValue could be, for example, ArrayList, and the oldValue of type Collection (representing null).
        Specified by:
        initialise in interface SCO<K>
        Overrides:
        initialise in class HashMap<K,​V>
        Parameters:
        newValue - New value (to wrap)
        oldValue - Old value (to use in deciding what needs deleting etc)
      • initialise

        public void initialise​(java.util.HashMap m)
        Method to initialise the SCO from an existing value.
        Specified by:
        initialise in interface SCO<K>
        Overrides:
        initialise in class HashMap<K,​V>
        Parameters:
        m - Object to set value using.
      • initialise

        public void initialise()
        Method to initialise the SCO for use.
        Specified by:
        initialise in interface SCO<K>
        Overrides:
        initialise in class HashMap<K,​V>
      • getValue

        public java.util.HashMap getValue()
        Accessor for the unwrapped value that we are wrapping.
        Specified by:
        getValue in interface SCO<K>
        Overrides:
        getValue in class HashMap<K,​V>
        Returns:
        The unwrapped value
      • load

        public void load()
        Method to effect the load of the data in the SCO. Used when the SCO supports lazy-loading to tell it to load all now.
        Specified by:
        load in interface SCOContainer<K>
        Overrides:
        load in class HashMap<K,​V>
      • isLoaded

        public boolean isLoaded()
        Method to return if the SCO has its contents loaded. If the SCO doesn't support lazy loading will just return true.
        Specified by:
        isLoaded in interface BackedSCO
        Specified by:
        isLoaded in interface SCOContainer<K>
        Overrides:
        isLoaded in class HashMap<K,​V>
        Returns:
        Whether it is loaded
      • loadFromStore

        protected void loadFromStore()
        Method to load all elements from the "backing store" where appropriate.
      • updateEmbeddedKey

        public void updateEmbeddedKey​(K key,
                                      int fieldNumber,
                                      java.lang.Object newValue,
                                      boolean makeDirty)
        Method to update an embedded key in this map.
        Specified by:
        updateEmbeddedKey in interface SCOMap<java.util.HashMap<K,​V>,​K,​V>
        Overrides:
        updateEmbeddedKey in class HashMap<K,​V>
        Parameters:
        key - The key
        fieldNumber - Number of field in the key
        newValue - New value for this field
        makeDirty - Whether to make the SCO field dirty.
      • updateEmbeddedValue

        public void updateEmbeddedValue​(V value,
                                        int fieldNumber,
                                        java.lang.Object newValue,
                                        boolean makeDirty)
        Method to update an embedded value in this map.
        Specified by:
        updateEmbeddedValue in interface SCOMap<java.util.HashMap<K,​V>,​K,​V>
        Overrides:
        updateEmbeddedValue in class HashMap<K,​V>
        Parameters:
        value - The value
        fieldNumber - Number of field in the value
        newValue - New value for this field
        makeDirty - Whether to make the SCO field dirty.
      • unsetOwner

        public void unsetOwner()
        Method to unset the owner and field details.
        Specified by:
        unsetOwner in interface SCO<K>
        Overrides:
        unsetOwner in class HashMap<K,​V>
      • clone

        public java.lang.Object clone()
        Creates and returns a copy of this object.

        Mutable second-class Objects are required to provide a public clone method in order to allow for copying persistable objects. In contrast to Object.clone(), this method must not throw a CloneNotSupportedException.

        Specified by:
        clone in interface SCO<K>
        Overrides:
        clone in class HashMap<K,​V>
        Returns:
        The cloned object
      • containsKey

        public boolean containsKey​(java.lang.Object key)
        Method to return if the map contains this key
        Specified by:
        containsKey in interface java.util.Map<K,​V>
        Overrides:
        containsKey in class HashMap<K,​V>
        Parameters:
        key - The key
        Returns:
        Whether it is contained
      • containsValue

        public boolean containsValue​(java.lang.Object value)
        Method to return if the map contains this value.
        Specified by:
        containsValue in interface java.util.Map<K,​V>
        Overrides:
        containsValue in class HashMap<K,​V>
        Parameters:
        value - The value
        Returns:
        Whether it is contained
      • entrySet

        public java.util.Set entrySet()
        Accessor for the set of entries in the Map.
        Specified by:
        entrySet in interface java.util.Map<K,​V>
        Overrides:
        entrySet in class HashMap<K,​V>
        Returns:
        Set of entries
      • equals

        public boolean equals​(java.lang.Object o)
        Specified by:
        equals in interface java.util.Map<K,​V>
        Overrides:
        equals in class HashMap<K,​V>
      • forEach

        public void forEach​(java.util.function.BiConsumer<? super K,​? super V> action)
        Specified by:
        forEach in interface java.util.Map<K,​V>
        Overrides:
        forEach in class HashMap<K,​V>
      • get

        public V get​(java.lang.Object key)
        Accessor for the value stored against a key.
        Specified by:
        get in interface java.util.Map<K,​V>
        Overrides:
        get in class HashMap<K,​V>
        Parameters:
        key - The key
        Returns:
        The value.
      • hashCode

        public int hashCode()
        Specified by:
        hashCode in interface java.util.Map<K,​V>
        Overrides:
        hashCode in class HashMap<K,​V>
      • isEmpty

        public boolean isEmpty()
        Method to return if the Map is empty.
        Specified by:
        isEmpty in interface java.util.Map<K,​V>
        Overrides:
        isEmpty in class HashMap<K,​V>
        Returns:
        Whether it is empty.
      • keySet

        public java.util.Set keySet()
        Accessor for the set of keys in the Map.
        Specified by:
        keySet in interface java.util.Map<K,​V>
        Overrides:
        keySet in class HashMap<K,​V>
        Returns:
        Set of keys.
      • size

        public int size()
        Method to return the size of the Map.
        Specified by:
        size in interface java.util.Map<K,​V>
        Overrides:
        size in class HashMap<K,​V>
        Returns:
        The size
      • values

        public java.util.Collection values()
        Accessor for the set of values in the Map.
        Specified by:
        values in interface java.util.Map<K,​V>
        Overrides:
        values in class HashMap<K,​V>
        Returns:
        Set of values.
      • clear

        public void clear()
        Method to clear the HashMap.
        Specified by:
        clear in interface java.util.Map<K,​V>
        Overrides:
        clear in class HashMap<K,​V>
      • put

        public V put​(K key,
                     V value)
        Method to add a value against a key to the HashMap.
        Specified by:
        put in interface java.util.Map<K,​V>
        Overrides:
        put in class HashMap<K,​V>
        Parameters:
        key - The key
        value - The value
        Returns:
        The previous value for the specified key.
      • putAll

        public void putAll​(java.util.Map m)
        Method to add the specified Map's values under their keys here.
        Specified by:
        putAll in interface java.util.Map<K,​V>
        Overrides:
        putAll in class HashMap<K,​V>
        Parameters:
        m - The map
      • remove

        public V remove​(java.lang.Object key)
        Method to remove the value for a key from the HashMap.
        Specified by:
        remove in interface java.util.Map<K,​V>
        Overrides:
        remove in class HashMap<K,​V>
        Parameters:
        key - The key to remove
        Returns:
        The value that was removed from this key.
      • writeReplace

        protected java.lang.Object writeReplace()
                                         throws java.io.ObjectStreamException
        The writeReplace method is called when ObjectOutputStream is preparing to write the object to the stream. The ObjectOutputStream checks whether the class defines the writeReplace method. If the method is defined, the writeReplace method is called to allow the object to designate its replacement in the stream. The object returned should be either of the same type as the object passed in or an object that when read and resolved will result in an object of a type that is compatible with all references to the object.
        Overrides:
        writeReplace in class HashMap<K,​V>
        Returns:
        the replaced object
        Throws:
        java.io.ObjectStreamException - if an error occurs