Module org.htmlunit.corejs
Package org.htmlunit.corejs.javascript

Class HashSlotMap<T extends PropHolder<T>>

java.lang.Object
org.htmlunit.corejs.javascript.HashSlotMap<T>
All Implemented Interfaces:
Iterable<Slot<T>>, SlotMap<T>
public class HashSlotMap<T extends PropHolder<T>> extends Object implements SlotMap<T>
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.

  • Constructor Details

    • HashSlotMap

      public HashSlotMap()

    • HashSlotMap

      protected HashSlotMap(int capacity)

    • HashSlotMap

      public HashSlotMap(SlotMap<T> oldMap)

    • HashSlotMap

      public HashSlotMap(SlotMap<T> oldMap, Slot<T> newSlot)

  • Method Details

    • size

      public int size()
      Description copied from interface: SlotMap
      Return the size of the map.
      Specified by:
      size in interface SlotMap<T extends PropHolder<T>>

    • isEmpty

      public boolean isEmpty()
      Description copied from interface: SlotMap
      Return whether the map is empty.
      Specified by:
      isEmpty in interface SlotMap<T extends PropHolder<T>>

    • query

      public Slot<T> 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<T extends PropHolder<T>>
      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<T> modify(SlotMapOwner<T> owner, 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<T extends PropHolder<T>>
      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.

    • compute

      public <S extends Slot<T>> S compute(SlotMapOwner<T> owner, CompoundOperationMap<T> compoundOp, Object key, int index, SlotMap.SlotComputer<S,T> c)
      Specified by:
      compute in interface SlotMap<T extends PropHolder<T>>

    • add

      public void add(SlotMapOwner<T> owner, Slot<T> 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<T extends PropHolder<T>>

    • iterator

      public Iterator<Slot<T>> iterator()
      Specified by:
      iterator in interface Iterable<T extends PropHolder<T>>

    • copyMap

      public SlotMap<T> copyMap()
      Specified by:
      copyMap in interface SlotMap<T extends PropHolder<T>>