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//
// System.Data.DataRelationCollection.cs
//
// Author:
// Christopher Podurgiel (cpodurgiel@msn.com)
// Daniel Morgan <danmorg@sc.rr.com>
// Tim Coleman (tim@timcoleman.com)
// Alan Tam Siu Lung <Tam@SiuLung.com>
//
// (C) Chris Podurgiel
// (C) 2002 Daniel Morgan
// Copyright (C) Tim Coleman, 2002
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.ComponentModel;
namespace System.Data {
/// <summary>
/// Represents the collection of DataRelation objects for this DataSet.
/// </summary>
[Editor ("Microsoft.VSDesigner.Data.Design.DataRelationCollectionEditor, " + Consts.AssemblyMicrosoft_VSDesigner,
"System.Drawing.Design.UITypeEditor, " + Consts.AssemblySystem_Drawing)]
[DefaultEvent ("CollectionChanged")]
[DefaultProperty ("Table")]
#if !NET_2_0
[Serializable]
#endif
public abstract class DataRelationCollection : InternalDataCollectionBase
{
/// <summary>
/// Summary description for DataTableRelationCollection.
/// </summary>
internal class DataSetRelationCollection : DataRelationCollection
{
private DataSet dataSet;
DataRelation[] mostRecentRelations;
/// <summary>
/// Initializes a new instance of the DataSetRelationCollection class.
/// </summary>
internal DataSetRelationCollection (DataSet dataSet)
{
this.dataSet = dataSet;
}
protected override DataSet GetDataSet()
{
return dataSet;
}
/// <summary>
/// Performs verification on the table.
/// </summary>
/// <param name="relation">The relation to check.</param>
protected override void AddCore (DataRelation relation)
{
if (relation.ChildTable.DataSet != this.dataSet
|| relation.ParentTable.DataSet != this.dataSet)
throw new DataException ();
base.AddCore (relation);
relation.ParentTable.ChildRelations.Add (relation);
relation.ChildTable.ParentRelations.Add (relation);
relation.SetDataSet (dataSet);
relation.UpdateConstraints ();
}
protected override void RemoveCore (DataRelation relation)
{
base.RemoveCore(relation);
relation.SetDataSet (null);
relation.ParentTable.ChildRelations.Remove (relation);
relation.ChildTable.ParentRelations.Remove (relation);
relation.SetParentKeyConstraint (null);
relation.SetChildKeyConstraint (null);
}
public override void AddRange (DataRelation[] relations)
{
if (relations == null)
return;
if (dataSet != null && dataSet.InitInProgress){
mostRecentRelations = relations;
return;
}
foreach (DataRelation rel in relations){
if (rel == null)
continue;
Add (rel);
}
}
internal override void PostAddRange ()
{
if (mostRecentRelations == null)
return;
foreach (DataRelation rel in mostRecentRelations){
if (rel == null)
continue;
if (rel.InitInProgress)
rel.FinishInit (dataSet);
Add (rel);
}
mostRecentRelations = null;
}
protected override ArrayList List {
get {
return base.List;
}
}
}
/// <summary>
/// Summary description for DataTableRelationCollection.
/// </summary>
internal class DataTableRelationCollection : DataRelationCollection
{
private DataTable dataTable;
/// <summary>
/// Initializes a new instance of the DataTableRelationCollection class.
/// </summary>
internal DataTableRelationCollection (DataTable dataTable)
{
this.dataTable = dataTable;
}
protected override DataSet GetDataSet()
{
return dataTable.DataSet;
}
/// <summary>
/// Performs verification on the table.
/// </summary>
/// <param name="relation">The relation to check.</param>
protected override void AddCore (DataRelation relation)
{
if (dataTable.ParentRelations == this && relation.ChildTable != dataTable)
throw new ArgumentException ("Cannot add a relation to this table's " +
"ParentRelations where this table is not" +
" the Child table.");
if (dataTable.ChildRelations == this && relation.ParentTable != dataTable)
throw new ArgumentException("Cannot add a relation to this table's " +
"ChildRelations where this table is not" +
" the Parent table.");
dataTable.DataSet.Relations.Add(relation);
base.AddCore (relation);
}
protected override void RemoveCore (DataRelation relation)
{
relation.DataSet.Relations.Remove(relation);
base.RemoveCore (relation);
}
protected override ArrayList List {
get {
return base.List;
}
}
}
private int defaultNameIndex;
private DataRelation inTransition;
int index;
/// <summary>
/// Initializes a new instance of the DataRelationCollection class.
/// </summary>
protected DataRelationCollection ()
: base ()
{
inTransition = null;
defaultNameIndex = 1;
}
/// <summary>
/// Gets the DataRelation object specified by name.
/// </summary>
public DataRelation this [string name] {
get {
int index = IndexOf (name, true);
return index < 0 ? null : (DataRelation) List[index];
}
}
/// <summary>
/// Gets the DataRelation object at the specified index.
/// </summary>
public DataRelation this [int index] {
get {
if (index < 0 || index >= List.Count)
throw new IndexOutOfRangeException (String.Format ("Cannot find relation {0}.", index));
return (DataRelation)List [index];
}
}
#region Add Methods
private string GetNextDefaultRelationName ()
{
int index = 1;
string defRelationName = "Relation" +index;
for (; Contains (defRelationName); ++index) {
defRelationName = "Relation" + index;
}
return defRelationName;
}
/// <summary>
/// Adds a DataRelation to the DataRelationCollection.
/// </summary>
/// <param name="relation">The DataRelation to add to the collection.</param>
[MonoTODO]
public void Add(DataRelation relation)
{
// To prevent endless recursion
if(inTransition == relation) {
return;
}
else {
inTransition = relation;
}
try
{
this.AddCore (relation);
if(relation.RelationName == string.Empty)
relation.RelationName = GenerateRelationName();
relation.ParentTable.ResetPropertyDescriptorsCache();
relation.ChildTable.ResetPropertyDescriptorsCache();
CollectionChangeEventArgs e = new CollectionChangeEventArgs(CollectionChangeAction.Add, this);
OnCollectionChanged(e);
}
finally
{
inTransition = null;
}
}
private string GenerateRelationName()
{
index++;
return "Relation" + index;
}
/// <summary>
/// Creates a relation given the parameters and adds it to the collection. The name is defaulted.
/// An ArgumentException is generated if this relation already belongs to this collection or belongs to another collection.
/// An InvalidConstraintException is generated if the relation can't be created based on the parameters.
/// The CollectionChanged event is fired if it succeeds.
/// </summary>
/// <param name="parentColumn">parent column of relation.</param>
/// <param name="childColumn">child column of relation.</param>
/// <returns>The created DataRelation.</returns>
public virtual DataRelation Add(DataColumn parentColumn, DataColumn childColumn)
{
DataRelation dataRelation = new DataRelation(GetNextDefaultRelationName (), parentColumn, childColumn);
Add(dataRelation);
return dataRelation;
}
/// <summary>
/// Creates a relation given the parameters and adds it to the collection. The name is defaulted.
/// An ArgumentException is generated if this relation already belongs to this collection or belongs to another collection.
/// An InvalidConstraintException is generated if the relation can't be created based on the parameters.
/// The CollectionChanged event is raised if it succeeds.
/// </summary>
/// <param name="parentColumns">An array of parent DataColumn objects.</param>
/// <param name="childColumns">An array of child DataColumn objects.</param>
/// <returns>The created DataRelation.</returns>
public virtual DataRelation Add(DataColumn[] parentColumns, DataColumn[] childColumns)
{
DataRelation dataRelation = new DataRelation(GetNextDefaultRelationName (), parentColumns, childColumns);
Add(dataRelation);
return dataRelation;
}
/// <summary>
/// Creates a relation given the parameters and adds it to the collection.
/// An ArgumentException is generated if this relation already belongs to this collection or belongs to another collection.
/// A DuplicateNameException is generated if this collection already has a relation with the same name (case insensitive).
/// An InvalidConstraintException is generated if the relation can't be created based on the parameters.
/// The CollectionChanged event is raised if it succeeds.
/// </summary>
/// <param name="name">The name of the relation.</param>
/// <param name="parentColumn">parent column of relation.</param>
/// <returns>The created DataRelation.</returns>
/// <returns></returns>
public virtual DataRelation Add(string name, DataColumn parentColumn, DataColumn childColumn)
{
//If no name was supplied, give it a default name.
if (name == null || name == "") name = GetNextDefaultRelationName ();
DataRelation dataRelation = new DataRelation(name, parentColumn, childColumn);
Add(dataRelation);
return dataRelation;
}
/// <summary>
/// Creates a DataRelation with the specified name, and arrays of parent and child columns, and adds it to the collection.
/// </summary>
/// <param name="name">The name of the DataRelation to create.</param>
/// <param name="parentColumns">An array of parent DataColumn objects.</param>
/// <param name="childColumns">An array of child DataColumn objects.</param>
/// <returns>The created DataRelation.</returns>
public virtual DataRelation Add(string name, DataColumn[] parentColumns, DataColumn[] childColumns)
{
//If no name was supplied, give it a default name.
if (name == null || name == "") name = GetNextDefaultRelationName ();
DataRelation dataRelation = new DataRelation(name, parentColumns, childColumns);
Add(dataRelation);
return dataRelation;
}
/// <summary>
/// Creates a relation given the parameters and adds it to the collection.
/// An ArgumentException is generated if this relation already belongs to this collection or belongs to another collection.
/// A DuplicateNameException is generated if this collection already has a relation with the same name (case insensitive).
/// An InvalidConstraintException is generated if the relation can't be created based on the parameters.
/// The CollectionChanged event is raised if it succeeds.
/// </summary>
/// <param name="name">The name of the relation.</param>
/// <param name="parentColumn">parent column of relation.</param>
/// <param name="childColumn">child column of relation.</param>
/// <param name="createConstraints">true to create constraints; otherwise false. (default is true)</param>
/// <returns>The created DataRelation.</returns>
public virtual DataRelation Add(string name, DataColumn parentColumn, DataColumn childColumn, bool createConstraints)
{
//If no name was supplied, give it a default name.
if (name == null || name == "") name = GetNextDefaultRelationName ();
DataRelation dataRelation = new DataRelation(name, parentColumn, childColumn, createConstraints);
Add(dataRelation);
return dataRelation;
}
/// <summary>
/// Creates a DataRelation with the specified name, arrays of parent and child columns,
/// and value specifying whether to create a constraint, and adds it to the collection.
/// </summary>
/// <param name="name">The name of the DataRelation to create.</param>
/// <param name="parentColumns">An array of parent DataColumn objects.</param>
/// <param name="childColumns">An array of child DataColumn objects.</param>
/// <param name="createConstraints">true to create a constraint; otherwise false.</param>
/// <returns>The created DataRelation.</returns>
public virtual DataRelation Add(string name, DataColumn[] parentColumns, DataColumn[] childColumns, bool createConstraints)
{
//If no name was supplied, give it a default name.
if (name == null || name == "") name = GetNextDefaultRelationName ();
DataRelation dataRelation = new DataRelation(name, parentColumns, childColumns, createConstraints);
Add(dataRelation);
return dataRelation;
}
#endregion
/// <summary>
/// Adds to the list
/// </summary>
/// <param name="relation">The relation to check.</param>
[MonoTODO]
protected virtual void AddCore(DataRelation relation)
{
if (relation == null) {
//TODO: Issue a good exception message.
throw new ArgumentNullException();
}
if(List.IndexOf(relation) != -1) {
//TODO: Issue a good exception message.
throw new ArgumentException();
}
// check if the collection has a relation with the same name.
int tmp = IndexOf(relation.RelationName);
// if we found a relation 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 &&
relation.RelationName == this[tmp].RelationName)
throw new DuplicateNameException("A DataRelation named '" + relation.RelationName + "' already belongs to this DataSet.");
// check whether the relation exists between the columns already
foreach (DataRelation rel in this) {
// compare child columns
bool differs = false;
foreach (DataColumn current in relation.ChildColumns) {
bool exists = false;
foreach (DataColumn col in rel.ChildColumns) {
if (col == current) {
exists = true;
break;
}
}
if (!exists) {
differs = true;
break;
}
}
if (! differs) {
// compare parent columns
differs = false;
foreach (DataColumn current in relation.ParentColumns) {
bool exists = false;
foreach (DataColumn col in rel.ParentColumns) {
if (col == current) {
exists = true;
break;
}
}
if (!exists) {
differs = true;
break;
}
}
if (! differs)
throw new ArgumentException ("A relation already exists for these child columns");
}
}
// Add to collection
List.Add(relation);
}
/// <summary>
/// Copies the elements of the specified DataRelation array to the end of the collection.
/// </summary>
/// <param name="relations">The array of DataRelation objects to add to the collection.</param>
public virtual void AddRange(DataRelation[] relations)
{
if (relations == null)
return;
foreach (DataRelation relation in relations)
Add (relation);
}
internal virtual void PostAddRange ()
{
}
public virtual bool CanRemove(DataRelation relation)
{
if (relation == null || !GetDataSet().Equals(relation.DataSet))
return false;
// check if the relation doesnot belong to this collection
int tmp = IndexOf(relation.RelationName);
// if we found a relation 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(relation.RelationName != this[tmp].RelationName)
return false;
}
else {
return false;
}
return true;
}
public virtual void Clear()
{
for (int i = 0; i < Count; i++)
Remove(this[i]);
List.Clear();
}
public virtual bool Contains(string name)
{
return (-1 != IndexOf (name, false));
}
private CollectionChangeEventArgs CreateCollectionChangeEvent (CollectionChangeAction action)
{
return new CollectionChangeEventArgs (action, this);
}
protected abstract DataSet GetDataSet();
public virtual int IndexOf(DataRelation relation)
{
return List.IndexOf(relation);
}
public virtual int IndexOf(string relationName)
{
return IndexOf(relationName, false);
}
private int IndexOf (string name, bool error)
{
int count = 0, match = -1;
for (int i = 0; i < List.Count; i++)
{
String name2 = ((DataRelation) List[i]).RelationName;
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;
}
protected virtual void OnCollectionChanged (CollectionChangeEventArgs ccevent)
{
if (CollectionChanged != null)
CollectionChanged (this, ccevent);
}
[MonoTODO]
protected internal virtual void OnCollectionChanging (CollectionChangeEventArgs ccevent)
{
throw new NotImplementedException ();
}
public void Remove (DataRelation relation)
{
// To prevent endless recursion
if(inTransition == relation) {
return;
}
else {
inTransition = relation;
}
if (relation == null)
return;
try
{
// check if the list doesnot contains this relation.
if (!(List.Contains(relation)))
throw new ArgumentException("Relation doesnot belong to this Collection.");
RemoveCore (relation);
string name = "Relation" + index;
if (relation.RelationName == name)
index--;
OnCollectionChanged (CreateCollectionChangeEvent (CollectionChangeAction.Remove));
}
finally
{
inTransition = null;
}
}
public void Remove (string name)
{
DataRelation relation = this[name];
if (relation == null)
throw new ArgumentException("Relation doesnot belong to this Collection.");
Remove(relation);
}
public void RemoveAt (int index)
{
DataRelation relation = this[index];
if (relation == null)
throw new IndexOutOfRangeException(String.Format("Cannot find relation {0}", index));
Remove(relation);
}
[MonoTODO]
protected virtual void RemoveCore(DataRelation relation)
{
// Remove from collection
List.Remove(relation);
}
#region Events
[ResDescriptionAttribute ("Occurs whenever this collection's membership changes.")]
public event CollectionChangeEventHandler CollectionChanged;
#endregion
}
}
|