Package org.mozilla.javascript
Class HashSlotMap
- java.lang.Object
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- org.mozilla.javascript.HashSlotMap
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public class HashSlotMap extends java.lang.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.
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Constructor Summary
Constructors Constructor Description HashSlotMap()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidadd(Slot newSlot)Insert a new slot to the map.booleanisEmpty()Return whether the map is empty.java.util.Iterator<Slot>iterator()Slotmodify(java.lang.Object key, int index, int attributes)Return the Slot that matches EITHER "key" or "index".Slotquery(java.lang.Object key, int index)Retrieve the slot at EITHER key or index, or return null if the slot cannot be found.voidremove(java.lang.Object key, int index)Remove the slot at either "key" or "index".voidreplace(Slot oldSlot, Slot newSlot)Replace "slot" with a new slot.intsize()Return the size of the map.
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Method Detail
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size
public int size()
Description copied from interface:SlotMapReturn the size of the map.
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isEmpty
public boolean isEmpty()
Description copied from interface:SlotMapReturn whether the map is empty.
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query
public Slot query(java.lang.Object key, int index)
Description copied from interface:SlotMapRetrieve the slot at EITHER key or index, or return null if the slot cannot be found.
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modify
public Slot modify(java.lang.Object key, int index, int attributes)
Description copied from interface:SlotMapReturn 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:
modifyin interfaceSlotMap- 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.
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replace
public void replace(Slot oldSlot, Slot newSlot)
Description copied from interface:SlotMapReplace "slot" with a new slot. This is used to change slot types.
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add
public void add(Slot newSlot)
Description copied from interface:SlotMapInsert a new slot to the map. Both "name" and "indexOrHash" must be populated. Note that ScriptableObject generally adds slots via the "modify" method.
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remove
public void remove(java.lang.Object key, int index)Description copied from interface:SlotMapRemove the slot at either "key" or "index".
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