// <summary>
// The mapping view model contains a MappingScalarProperty for every column in the table. The user can clear out the
// underlying scalar property, but that doesn't remove or add the MappingScalarProperty. We need the placeholder
// in the view model to show the nodes in the Trid even if there isn't a mapping. Thus, we don't need to call
// this.Parent.AddChild(this) since its already there.
// </summary>
internal void CreateModelItem(CommandProcessorContext cpc, EditingContext context, List <Property> propertiesChain)
{
Debug.Assert(propertiesChain != null, "The propertiesChain cannot be null");
Debug.Assert(context != null, "The context argument cannot be null");
Debug.Assert(ScalarProperty == null, "Don't call this method if we already have a ModelItem");
Debug.Assert(MappingStorageEntityType.StorageEntityType != null, "The parent item isn't set up correctly");
Debug.Assert(propertiesChain.Count > 0, "propertiesChain cannot be empty");
Context = context;
// local shortcuts
EntityType entityType = MappingConceptualEntityType.ConceptualEntityType;
EntityType table = MappingStorageEntityType.StorageEntityType;
// find the s-side property based on the value stored in this.ColumnName
var tableColumn = table.GetFirstNamedChildByLocalName(ColumnName) as Property;
Debug.Assert(tableColumn != null, "Failed looking up table column for ScalarProperty.");
if (tableColumn == null)
{
return;
}
try
{
// now make the change
if (cpc == null)
{
cpc = new CommandProcessorContext(
Context, EfiTransactionOriginator.MappingDetailsOriginatorId, Resources.Tx_CreateScalarProperty);
}
var cmd = new CreateFragmentScalarPropertyTreeCommand(entityType, propertiesChain, tableColumn);
cmd.PostInvokeEvent += (o, eventsArgs) =>
{
var sp = cmd.ScalarProperty;
Debug.Assert(sp != null, "CreateFragmentScalarPropertyTreeCommand failed to create ScalarProperty");
// fix up our view model (we don't have to add this to the parent's children collection
// because we created a placeholder row already for every column in the table)
ModelItem = sp;
};
var cp = new CommandProcessor(cpc, cmd);
cp.Invoke();
}
catch
{
ModelItem = null;
throw;
}
}
internal void ChangeScalarProperty(EditingContext context, List <Property> newPropertiesChain)
{
if (ModelItem != null)
{
var propertiesChain = ScalarProperty.GetMappedPropertiesList();
var changeNeeded = false;
// is it different than what we have already?
if (propertiesChain.Count != newPropertiesChain.Count)
{
changeNeeded = true;
}
else
{
for (var i = 0; i < propertiesChain.Count; i++)
{
if (propertiesChain[i] != newPropertiesChain[i])
{
changeNeeded = true;
break;
}
}
}
if (changeNeeded)
{
Debug.Assert(ScalarProperty.ColumnName.Status == BindingStatus.Known, "Table column not found");
if (ScalarProperty.ColumnName.Status == BindingStatus.Known)
{
// delete old and create new ScalarProperty in one transaction
var cpc = new CommandProcessorContext(
context, EfiTransactionOriginator.MappingDetailsOriginatorId, Resources.Tx_ChangeScalarProperty);
var cmd1 = ScalarProperty.GetDeleteCommand();
var cmd2 = new CreateFragmentScalarPropertyTreeCommand(
MappingConceptualEntityType.ConceptualEntityType, newPropertiesChain, ScalarProperty.ColumnName.Target);
cmd2.PostInvokeEvent += (o, eventsArgs) =>
{
var sp = cmd2.ScalarProperty;
Debug.Assert(sp != null, "CreateFragmentScalarPropertyTreeCommand failed to create a ScalarProperty");
ModelItem = sp;
};
var cp = new CommandProcessor(cpc, cmd1, cmd2);
try
{
cp.Invoke();
}
catch
{
ModelItem = null;
throw;
}
}
}
}
else
{
// if we don't have a scalar property, there is nothing to set this into;
// create the scalar property first
throw new InvalidOperationException();
}
}
private void ProcessMappingFragment(EntityInfo info, EntityType table, MappingFragment frag)
{
// move any scalar mappings to this fragment if they aren't there
foreach (var sp in info.NonKeyScalars)
{
Debug.Assert(sp.ColumnName.Target != null, "Found a ScalarProperty with an unknown column binding");
if (sp.ColumnName.Target.Parent == table &&
sp.MappingFragment != frag)
{
// delete the old, create the new
AddToDeleteList(sp);
var cmd = new CreateFragmentScalarPropertyTreeCommand(frag, sp.GetMappedPropertiesList(), sp.ColumnName.Target);
var cp = new CommandProcessor(_cpc, cmd);
cp.Invoke();
}
}
// move any conditions to this fragment if they aren't there
foreach (var cond in info.Conditions)
{
Debug.Assert(cond.ColumnName.Target != null, "Found a Condition with an unknown column binding");
if (cond.ColumnName.Target.Parent == table &&
cond.MappingFragment != frag)
{
// save off the condition information
bool?isNull = null;
if (cond.IsNull.Value == Condition.IsNullConstant)
{
isNull = true;
}
else if (cond.IsNull.Value == Condition.IsNotNullConstant)
{
isNull = false;
}
var conditionValue = cond.Value.Value;
var column = cond.ColumnName.Target;
// delete the old, create the new
AddToDeleteList(cond);
var cmd = new CreateFragmentConditionCommand(frag, column, isNull, conditionValue);
var cp = new CommandProcessor(_cpc, cmd);
cp.Invoke();
}
}
// build a list of all of the keys
var keysToMap = new List <Property>();
keysToMap.AddRange(info.KeyProperties);
// move any key scalar mappings to this fragment if they exist in a different one - provided they are for the same table
foreach (var sp in info.KeyScalars)
{
Debug.Assert(sp.ColumnName.Target != null, "Found a ScalarProperty with an unknown column binding");
if (sp.ColumnName.Target.Parent == table &&
sp.MappingFragment != frag)
{
var property = sp.Name.Target;
var column = sp.ColumnName.Target;
// delete the old, create the new
AddToDeleteList(sp);
var cmd = new CreateFragmentScalarPropertyCommand(frag, property, column);
var cp = new CommandProcessor(_cpc, cmd);
cp.Invoke();
}
// since we've mapped this one now, remove it from our list of things to do
keysToMap.Remove(sp.Name.Target);
}
// if its TPH, all keys need to be here
// (Note: if it's not TPH the user needs to specify any missing keys manually)
if (info.InheritanceStrategy == InheritanceMappingStrategy.TablePerHierarchy)
{
// loop through the base most type's keys and add those that we haven't mapped
foreach (var keyRemaining in keysToMap)
{
var sp = FindKeyMappingInAllParents(info, keyRemaining);
if (sp != null &&
sp.ColumnName.Target != null &&
sp.ColumnName.Target.Parent == table)
{
var cmd = new CreateFragmentScalarPropertyCommand(frag, sp.Name.Target, sp.ColumnName.Target);
var cp = new CommandProcessor(_cpc, cmd);
cp.Invoke();
}
}
}
// replicate all non-key base type scalars here if the parent uses a Default ETM
// (since there is no parent IsTypeOf ETM from which to "inherit" them)
if (info.Parent != null &&
info.Parent.UsesEntityTypeMappingKind(EntityTypeMappingKind.Default))
{
// first gather the list of scalars from all parents
var parentScalars = new List <ScalarProperty>();
GatherNonKeyScalarsFromAllParents(info.Parent, parentScalars);
// then build a list of those scalars used in our fragment
var existingMappedProperties = new HashSet <Property>();
foreach (var existingScalar in frag.ScalarProperties())
{
existingMappedProperties.Add(existingScalar.Name.Target);
}
// finally, add those in that aren't already in the fragment
foreach (var sp in parentScalars)
{
Debug.Assert(sp.ColumnName.Target != null, "Found a ScalarProperty with an unknown column binding");
// don't duplicate and only add those that use the same table as us
if (existingMappedProperties.Contains(sp.Name.Target) == false &&
sp.ColumnName.Target.EntityType == table)
{
var cmd = new CreateFragmentScalarPropertyTreeCommand(frag, sp.GetMappedPropertiesList(), sp.ColumnName.Target);
var cp = new CommandProcessor(_cpc, cmd);
cp.Invoke();
existingMappedProperties.Add(sp.Name.Target);
}
}
}
// make sure that we don't have any extra scalars
// so gather the list of all SPs we expect to be here
var expectedMappedProperties = new List <Property>();
expectedMappedProperties.AddRange(info.KeyProperties);
expectedMappedProperties.AddRange(info.NonKeyProperties);
if (info.Parent != null &&
info.Parent.UsesEntityTypeMappingKind(EntityTypeMappingKind.Default))
{
GatherNonKeyPropertiesFromAllParents(info.Parent, expectedMappedProperties);
}
// remove any that aren't in our expected list
foreach (var sp in frag.ScalarProperties())
{
if (expectedMappedProperties.Contains(sp.Name.Target) == false)
{
AddToDeleteList(sp);
}
}
}