/// <summary>
/// Commits a single model.
/// </summary>
protected override bool Commit(DataModelBase dataModel, ModelMetadata metadata)
{
if (metadata.GetKey(dataModel) < 0)
{
dataModel.SetValue(metadata.PrimaryKeyProperty, _nextKey++);
}
return(true);
}
/// <summary>
/// Initializes a new record.
/// </summary>
/// <param name="model">The newly created model object.</param>
/// <param name="metadata">Metadata about the model.</param>
protected override void InitializeNewRecord(DataModelBase model, ModelMetadata metadata)
{
base.InitializeNewRecord(model, metadata);
var databaseMetadata = metadata as IDatabaseModelMetadata;
if (databaseMetadata != null)
{
databaseMetadata.InitializeNewRecord(model, _database);
}
}
public DataModelBase TryCache(int id, DataModelBase model)
{
lock (_cache)
{
int idx;
DataModelBase cached = Find(id, out idx);
if (cached != null)
{
return(cached);
}
_cache.Insert(idx, new KeyValuePair <int, WeakReference>(id, new WeakReference(model)));
return(model);
}
}
void IDataModelCollection.Add(DataModelBase item)
{
if (IsReadOnly)
{
throw new ReadOnlyException("Cannot modify read only collection.");
}
if (IsModified)
{
Add((T)item);
}
else
{
_collection.Add((T)item);
SetValueCore(CountProperty, _collection.Count);
}
}
public void Cache(int id, DataModelBase model)
{
lock (_cache)
{
var entry = new KeyValuePair <int, WeakReference>(id, new WeakReference(model));
int idx;
DataModelBase cached = Find(id, out idx);
if (cached != null)
{
_cache[idx] = entry;
}
else
{
_cache.Insert(idx, entry);
}
}
}
/// <summary> /// Commits a single model. /// </summary> protected abstract bool Commit(DataModelBase dataModel, ModelMetadata metadata);
/// <summary>
/// Commits changes made to a data model. The shared model and any future copies will contain committed changes.
/// </summary>
/// <param name="dataModel">Data model to commit.</param>
/// <returns><c>true</c> if the changes were committed, <c>false</c> if not.</returns>
public bool Commit(DataModelBase dataModel)
{
if (!dataModel.IsModified && !(dataModel is IDataModelCollection))
{
return(true);
}
var metadata = _metadataRepository.GetModelMetadata(dataModel.GetType());
if (metadata == null)
{
return(false);
}
var collection = dataModel as IDataModelCollection;
if (collection != null)
{
var collectionMetadata = (IDataModelCollectionMetadata)metadata;
if (collectionMetadata.CommitItems)
{
foreach (DataModelBase model in collection)
{
if (!Commit(model))
{
return(false);
}
}
}
else
{
foreach (DataModelBase model in collection)
{
model.AcceptChanges();
}
}
}
var key = metadata.GetKey(dataModel);
_logger.Write("Committing {0}({1})", dataModel.GetType().Name, key);
if (!Commit(dataModel, metadata))
{
_logger.WriteWarning("Commit failed {0}({1})", dataModel.GetType().Name, key);
return(false);
}
var newKey = metadata.GetKey(dataModel);
if (key != newKey)
{
_logger.WriteVerbose("New key for {0}:{1}", dataModel.GetType().Name, newKey);
ExpireCollections(dataModel.GetType());
var fieldMetadata = metadata.GetFieldMetadata(metadata.PrimaryKeyProperty);
UpdateKeys(fieldMetadata, key, newKey);
}
dataModel.AcceptChanges();
return(true);
}
/// <summary>
/// Initializes a new record.
/// </summary>
/// <param name="model">The newly created model object.</param>
/// <param name="metadata">Metadata about the model.</param>
protected virtual void InitializeNewRecord(DataModelBase model, ModelMetadata metadata)
{
metadata.InitializePrimaryKey(model);
}
/// <summary>
/// Gets the unmodified value of a property on a model.
/// </summary>
/// <param name="model">The model to examine.</param>
/// <param name="property">The property to examine.</param>
/// <returns>The unmodified value of the property (which may be the current value of the property).</returns>
public static object GetOriginalValue(DataModelBase model, ModelProperty property)
{
return(model.GetOriginalValue(property));
}
/// <summary>
/// Determines if the specified property is modified on a model.
/// </summary>
/// <param name="model">The model to examine.</param>
/// <param name="property">The property to examine.</param>
/// <returns><c>true</c> if the property has been modified on the model, <c>false</c> if not.</returns>
public static bool IsPropertyModified(DataModelBase model, ModelProperty property)
{
return(model.IsModified && model.UpdatedPropertyKeys.Contains(property.Key));
}
bool IDataModelCollection.Contains(DataModelBase item)
{
return(_collection.Contains((T)item));
}
/// <summary>
/// Commits a single model.
/// </summary>
protected override bool Commit(DataModelBase dataModel, ModelMetadata metadata)
{
var databaseMetadata = metadata as IDatabaseModelMetadata;
return(databaseMetadata.Commit(dataModel, _database));
}
