/// <summary>
/// Represents the collection of tables for the DataSet.
/// </summary>
+ [Editor]
[DefaultEvent ("CollectionChanged")]
[ListBindable (false)]
[Serializable]
public DataTable this[string name] {
get {
- foreach (DataTable dt in list) {
- if (dt.TableName == name)
- return dt;
- }
-
- return null;
- }
+ int index = IndexOf (name, true);
+ return index < 0 ? null : (DataTable) list[index];
+ }
+ }
+
+#if NET_1_2
+ [MonoTODO]
+ public DataTable this [string name, string tbNamespace] {
+ get { throw new NotImplementedException (); }
}
+#endif
protected override ArrayList List {
get { return list; }
public virtual void Add (DataTable table)
{
+
+ // check if the reference is a null reference
+ if(table == null)
+ throw new ArgumentNullException("table");
+
+ // check if the list already contains this tabe.
+ if(list.Contains(table))
+ throw new ArgumentException("DataTable already belongs to this DataSet.");
+
+ // if the table name is null or empty string.
+ // give her a name.
if (table.TableName == null || table.TableName == string.Empty)
NameTable (table);
-
+
+ // check if the collection has a table with the same name.
+ int tmp = IndexOf(table.TableName);
+ // if we found a table with same name we have to check
+ // that it is the same case.
+ // indexof can return a table with different case letters.
+ if (tmp != -1)
+ {
+ if(table.TableName == this[tmp].TableName)
+ throw new DuplicateNameException("A DataTable named '" + table.TableName + "' already belongs to this DataSet.");
+ }
+
list.Add (table);
table.dataSet = dataSet;
OnCollectionChanged (new CollectionChangeEventArgs (CollectionChangeAction.Add, table));
return table;
}
+#if NET_1_2
+ public virtual DataTable Add (string name, string tbNamespace)
+ {
+ DataTable table = new DataTable (name, tbNamespace);
+ this.Add (table);
+ return table;
+ }
+#endif
+
public void AddRange (DataTable[] tables)
{
foreach (DataTable table in tables)
[MonoTODO]
public bool CanRemove (DataTable table)
{
- throw new NotImplementedException ();
+ return CanRemove(table, false);
}
public void Clear ()
public bool Contains (string name)
{
- foreach (DataTable dt in list) {
- if (dt.TableName == name)
- return true;
- }
-
- return false;
+ return (-1 != IndexOf (name, false));
}
public virtual int IndexOf (DataTable table)
public virtual int IndexOf (string name)
{
- return list.IndexOf (this [name]);
+ return IndexOf (name, false);
}
public void Remove (DataTable table)
{
- this.Remove (table.TableName);
+ CanRemove(table, true);
+ list.Remove(table);
OnCollectionChanged (new CollectionChangeEventArgs (CollectionChangeAction.Remove, table));
}
public void Remove (string name)
{
- list.Remove (this [name]);
+ Remove (this [name]);
}
public void RemoveAt (int index)
{
+ DataTable t = this[index];
+ CanRemove(t, true);
list.RemoveAt (index);
+ OnCollectionChanged (new CollectionChangeEventArgs (CollectionChangeAction.Remove, t));
}
#endregion
#endregion
#region Private methods
-
+
+ private int IndexOf (string name, bool error)
+ {
+ int count = 0, match = -1;
+ for (int i = 0; i < list.Count; i++)
+ {
+ String name2 = ((DataTable) list[i]).TableName;
+ if (String.Compare (name, name2, true) == 0)
+ {
+ if (String.Compare (name, name2, false) == 0)
+ return i;
+ match = i;
+ count++;
+ }
+ }
+ if (count == 1)
+ return match;
+ if (count > 1 && error)
+ throw new ArgumentException ("There is no match for the name in the same case and there are multiple matches in different case.");
+ return -1;
+ }
+
/// <summary>
/// gives name to Table (Table1, Table2, Table3,...)
/// </summary>
Table.TableName = Name + i;
}
+
+ // check if a table can be removed from this collectiuon.
+ // if the table can not be remved act according to throwException parameter.
+ // if it is true throws an Exception, else return false.
+ private bool CanRemove(DataTable table, bool throwException)
+ {
+ // check if table is null reference
+ if (table == null)
+ {
+ if(throwException)
+ throw new ArgumentNullException("table");
+ return false;
+ }
+
+ // check if the table has the same DataSet as this collection.
+ if(table.DataSet != this.dataSet)
+ {
+ if(throwException)
+ throw new ArgumentException("Table " + table.TableName + " does not belong to this DataSet.");
+ return false;
+ }
+
+ // check the table has a relation attached to it.
+ if (table.ParentRelations.Count > 0 || table.ChildRelations.Count > 0)
+ {
+ if(throwException)
+ throw new ArgumentException("Cannot remove a table that has existing relations. Remove relations first.");
+ return false;
+ }
+
+
+ // now we check if any ForeignKeyConstraint is referncing 'table'.
+ IEnumerator tableEnumerator = this.dataSet.Tables.GetEnumerator();
+
+ // loop on all tables in dataset
+ while (tableEnumerator.MoveNext())
+ {
+ IEnumerator constraintEnumerator = ((DataTable) tableEnumerator.Current).Constraints.GetEnumerator();
+ // loop on all constrains in the current table
+ while (constraintEnumerator.MoveNext())
+ {
+ Object o = constraintEnumerator.Current;
+ // we only check ForeignKeyConstraint
+ if (o is ForeignKeyConstraint)
+ {
+ ForeignKeyConstraint fc = (ForeignKeyConstraint) o;
+ if(fc.Table == table || fc.RelatedTable == table)
+ {
+ if(throwException)
+ throw new ArgumentException("Cannot remove table " + table.TableName + ", because it referenced in ForeignKeyConstraint " + fc.ConstraintName + ". Remove the constraint first.");
+ return false;
+ }
+ }
+ }
+ }
+
+ return true;
+ }
#endregion // Private methods
projects / mono.git / blobdiff