Class HashSlotMap

java.lang.Object
org.htmlunit.corejs.javascript.HashSlotMap
All Implemented Interfaces:
Iterable<Slot>, SlotMap

public class HashSlotMap extends Object implements SlotMap
This class implements the SlotMap interface using a java.util.HashMap. This class has more overhead than EmbeddedSlotMap, especially because it puts each "Slot" inside an intermediate object. However it is much more resistant to large number of hash collisions than EmbeddedSlotMap and therefore we use this implementation when an object gains a large number of properties.
  • Field Details

  • Constructor Details

    • HashSlotMap

      public HashSlotMap()
  • Method Details

    • size

      public int size()
      Description copied from interface: SlotMap
      Return the size of the map.
      Specified by:
      size in interface SlotMap
    • isEmpty

      public boolean isEmpty()
      Description copied from interface: SlotMap
      Return whether the map is empty.
      Specified by:
      isEmpty in interface SlotMap
    • query

      public Slot query(Object key, int index)
      Description copied from interface: SlotMap
      Retrieve the slot at EITHER key or index, or return null if the slot cannot be found.
      Specified by:
      query in interface SlotMap
      Parameters:
      key - The key for the slot, which should be a String or a Symbol.
      index - if key is zero, then this will be used as the key instead.
      Returns:
      either the Slot that matched the key and index, or null
    • modify

      public Slot modify(Object key, int index, int attributes)
      Description copied from interface: SlotMap
      Return the Slot that matches EITHER "key" or "index". (It will use "key" if it is not null, and otherwise "index".) If no slot exists, then create a default slot class.
      Specified by:
      modify in interface SlotMap
      Parameters:
      key - The key for the slot, which should be a String or a Symbol.
      index - if key is zero, then this will be used as the key instead.
      attributes - the attributes to be set on the slot if a new slot is created. Existing slots will not be modified.
      Returns:
      a Slot, which will be created anew if no such slot exists.
    • replace

      public void replace(Slot oldSlot, Slot newSlot)
      Description copied from interface: SlotMap
      Replace "slot" with a new slot. This is used to change slot types.
      Specified by:
      replace in interface SlotMap
    • createSlot

      private Slot createSlot(Object key, int index, int attributes)
    • add

      public void add(Slot newSlot)
      Description copied from interface: SlotMap
      Insert a new slot to the map. Both "name" and "indexOrHash" must be populated. Note that ScriptableObject generally adds slots via the "modify" method.
      Specified by:
      add in interface SlotMap
    • remove

      public void remove(Object key, int index)
      Description copied from interface: SlotMap
      Remove the slot at either "key" or "index".
      Specified by:
      remove in interface SlotMap
      Parameters:
      key - The key for the slot, which should be a String or a Symbol.
      index - if key is zero, then this will be used as the key instead.
    • iterator

      public Iterator<Slot> iterator()
      Specified by:
      iterator in interface Iterable<Slot>
    • makeKey

      private Object makeKey(Object name, int index)
    • makeKey

      private Object makeKey(Slot slot)