Beispiel #1
0
        public object this[int key]
        {
            get
            {
                // If no entry, DependencyProperty.UnsetValue is returned
                if (null != _mapStore)
                {
                    return _mapStore.Search(key);
                }
                return DependencyProperty.UnsetValue;
            }

            set
            {
                if (value != DependencyProperty.UnsetValue)
                {
                    // If not unset value, ensure write success
                    if (null != _mapStore)
                    {
                        // This is done because forward branches
                        // default prediction is not to be taken
                        // making this a CPU win because set is
                        // a common operation.
                    }
                    else
                    {
                        _mapStore = new SingleObjectMap();
                    }

                    FrugalMapStoreState myState = _mapStore.InsertEntry(key, value);
                    if (FrugalMapStoreState.Success == myState)
                    {
                        return;
                    }
                    else
                    {
                        // Need to move to a more complex storage
                        FrugalMapBase newStore;

                        if (FrugalMapStoreState.ThreeObjectMap == myState)
                        {
                            newStore = new ThreeObjectMap();
                        }
                        else if (FrugalMapStoreState.SixObjectMap == myState)
                        {
                            newStore = new SixObjectMap();
                        }
                        else if (FrugalMapStoreState.Array == myState)
                        {
                            newStore = new ArrayObjectMap();
                        }
                        else if (FrugalMapStoreState.SortedArray == myState)
                        {
                            newStore = new SortedObjectMap();
                        }
                        else if (FrugalMapStoreState.Hashtable == myState)
                        {
                            newStore = new HashObjectMap();
                        }
                        else
                        {
                            throw new InvalidOperationException(SR.Get(SRID.FrugalMap_CannotPromoteBeyondHashtable));
                        }

                        // Extract the values from the old store and insert them into the new store
                        _mapStore.Promote(newStore);

                        // Insert the new value
                        _mapStore = newStore;
                        _mapStore.InsertEntry(key, value);
                    }
                }
                else
                {
                    // DependencyProperty.UnsetValue means remove the value
                    if (null != _mapStore)
                    {
                        _mapStore.RemoveEntry(key);
                        if (_mapStore.Count == 0)
                        {
                            // Map Store is now empty ... throw it away
                            _mapStore = null;
                        }
                    }
                }
            }
        }
Beispiel #2
0
        private void SetCachedDefaultValue(DependencyObject owner, DependencyProperty property, object value)
        {
            FrugalMapBase map = _defaultValueFactoryCache.GetValue(owner); 

            if (map == null) 
            { 
                map = new SingleObjectMap();
                _defaultValueFactoryCache.SetValue(owner, map); 
            }
            else if (!(map is HashObjectMap))
            {
                FrugalMapBase newMap = new HashObjectMap(); 
                map.Promote(newMap);
                map = newMap; 
                _defaultValueFactoryCache.SetValue(owner, map); 
            }
 
            map.InsertEntry(property.GlobalIndex, value);
        }