/// <summary>
/// Gets the value of a <see cref="ModelProperty"/> for this instance.
/// </summary>
/// <param name="property">The <see cref="ModelProperty"/> to query.</param>
/// <returns>The current value of the <see cref="ModelProperty"/> for this instance.</returns>
public virtual object GetValue(ModelProperty property)
{
object value;
if (!_values.TryGetValue(property.Key, out value))
{
value = property.DefaultValue;
var uninitializedValue = value as ModelProperty.UnitializedValue;
if (uninitializedValue != null)
{
_values = _values.AddOrUpdate(property.Key, null); // set a temporary placeholder to prevent infinite recursion
value = uninitializedValue.GetValue(this);
SetValueCore(property, value);
}
}
return(value);
}
/// <summary>
/// Registers a callback to call when a specified property changes.
/// </summary>
/// <param name="property">The property to monitor.</param>
/// <param name="handler">The method to call when the property changes.</param>
public void AddPropertyChangedHandler(ModelProperty property, EventHandler <ModelPropertyChangedEventArgs> handler)
{
lock (_lockObject)
{
List <WeakAction <object, ModelPropertyChangedEventArgs> > handlers;
if (!_propertyChangedHandlers.TryGetValue(property.Key, out handlers))
{
handlers = new List <WeakAction <object, ModelPropertyChangedEventArgs> >();
_propertyChangedHandlers = _propertyChangedHandlers.AddOrUpdate(property.Key, handlers);
}
handlers.Add(new WeakAction <object, ModelPropertyChangedEventArgs>(handler.Method, handler.Target));
}
var uninitializedValue = property.DefaultValue as ModelProperty.UnitializedValue;
if (uninitializedValue != null && !_values.ContainsKey(property.Key))
{
var value = uninitializedValue.GetValue(this);
SetValueCore(property, value);
}
}
/// <summary>
/// Sets the value of a <see cref="ModelProperty"/> for this instance.
/// </summary>
/// <param name="property">The <see cref="ModelProperty"/> to update.</param>
/// <param name="value">The new value for the <see cref="ModelProperty"/>.</param>
public override sealed void SetValue(ModelProperty property, object value)
{
if (property == null)
{
throw new ArgumentNullException("property");
}
if (property.DefaultValue is ModelProperty.UnitializedValue)
{
throw new ArgumentException("Cannot assign value to derived property: " + property.FullName);
}
object currentValue;
lock (_lockObject)
{
object originalValue = GetOriginalValue(property);
if (!_updatedValues.TryGetValue(property.Key, out currentValue))
{
currentValue = originalValue;
}
if (Object.Equals(value, currentValue))
{
return;
}
if (Object.Equals(value, originalValue))
{
_updatedValues = _updatedValues.Remove(property.Key);
}
else
{
_updatedValues = _updatedValues.AddOrUpdate(property.Key, value);
}
}
OnModelPropertyChanged(new ModelPropertyChangedEventArgs(property, currentValue, value));
}
/// <summary>
/// Binds a property on a model to the view model.
/// </summary>
/// <param name="viewModelProperty">View model property to bind.</param>
/// <param name="binding">Information about how the view model property is bound.</param>
public void SetBinding(ModelProperty viewModelProperty, ModelBinding binding)
{
ModelBinding oldBinding;
if (_bindings.TryGetValue(viewModelProperty.Key, out oldBinding))
{
_bindings = _bindings.Remove(viewModelProperty.Key);
if (!IsObserving(oldBinding.Source, oldBinding.SourceProperty))
{
oldBinding.Source.RemovePropertyChangedHandler(oldBinding.SourceProperty, OnSourcePropertyChanged);
}
}
else if (_selfBindings.TryGetValue(viewModelProperty.Key, out oldBinding))
{
_selfBindings = _selfBindings.Remove(viewModelProperty.Key);
}
if (binding != null)
{
if (ReferenceEquals(binding.Source, this))
{
_selfBindings = _selfBindings.Add(viewModelProperty.Key, binding);
RefreshBinding(viewModelProperty.Key, binding);
}
else
{
if (!IsObserving(binding.Source, binding.SourceProperty))
{
binding.Source.AddPropertyChangedHandler(binding.SourceProperty, OnSourcePropertyChanged);
}
_bindings = _bindings.Add(viewModelProperty.Key, binding);
RefreshBinding(viewModelProperty.Key, binding);
}
}
}
private bool UpsertRelatedTable(ModelBase model, IDatabase database, string primaryTable, string relatedTable, ITinyDictionary <ForeignKeyFieldMetadata, List <int> > tableForeignKeyMetadatas)
{
ModelProperty joinProperty;
string joinFieldName = GetJoin(database, primaryTable, relatedTable, out joinProperty);
if (joinFieldName == null)
{
throw new InvalidOperationException("Cannot determine relationship between " + primaryTable + " and " + relatedTable);
}
List <int> tablePropertyKeys;
if (tableForeignKeyMetadatas.TryGetValue(null, out tablePropertyKeys))
{
if (!UpdateRow(model, database, relatedTable, tablePropertyKeys, joinProperty, joinFieldName) &&
!CreateRow(model, database, relatedTable, tablePropertyKeys, joinProperty, joinFieldName))
{
return(false);
}
}
// TODO: support updating related data on arbitrary foreign key join
return(true);
}
/// <summary>
/// Adds a field to the object.
/// </summary>
/// <param name="fieldName">Name of the field.</param>
/// <param name="type">The type of the field.</param>
/// <param name="value">The value of the field.</param>
public void AddField(string fieldName, JsonFieldType type, object value)
{
var field = new JsonField(fieldName, type, value);
_fields = _fields.AddOrUpdate(fieldName.ToLower(), field);
}
public TinyDictionaryDebugView(ITinyDictionary <TKey, TValue> dictionary)
{
_dictionary = dictionary;
}
/// <summary>
/// Removes all items from the <see cref="T:System.Collections.Generic.ICollection`1"/>.
/// </summary>
/// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only. </exception>
public void Clear()
{
_data = EmptyTinyDictionary <TKey, TValue> .Instance;
}
/// <summary>
/// Constructs a new TinyDictionary.
/// </summary>
public TinyDictionary()
{
_data = EmptyTinyDictionary <TKey, TValue> .Instance;
}
/// <summary>
/// Removes all items from the collection.
/// </summary>
public void Clear()
{
_items = EmptyTinyDictionary <T, int> .Instance;
}
