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//
// System.ComponentModel.Design.ServiceContainer.cs
//
// Authors:
// Martin Willemoes Hansen (mwh@sysrq.dk)
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
// Ivan N. Zlatev (contact i-nZ.net)
//
// (C) 2003 Martin Willemoes Hansen
// (C) 2003 Andreas Nahr
// (C) 2006 Ivan N. Zlatev
//
// 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;
namespace System.ComponentModel.Design
{
public class ServiceContainer : IServiceContainer, IServiceProvider, IDisposable
{
private IServiceProvider parentProvider;
private Hashtable services;
private bool _disposed;
public ServiceContainer()
: this (null)
{
}
private Hashtable Services {
get {
if (services == null)
services = new Hashtable ();
return services;
}
}
public ServiceContainer (IServiceProvider parentProvider)
{
this.parentProvider = parentProvider;
}
public void AddService (Type serviceType, object serviceInstance)
{
AddService (serviceType, serviceInstance, false);
}
public void AddService (Type serviceType, ServiceCreatorCallback callback)
{
AddService (serviceType, callback, false);
}
public virtual void AddService (Type serviceType,
object serviceInstance,
bool promote)
{
if (promote && parentProvider != null) {
IServiceContainer container = (IServiceContainer)
parentProvider.GetService (typeof (IServiceContainer));
container.AddService (serviceType, serviceInstance, promote);
return;
}
if (serviceType == null)
throw new ArgumentNullException ("serviceType");
if (serviceInstance == null)
throw new ArgumentNullException ("serviceInstance");
if (Services.Contains (serviceType))
throw new ArgumentException (string.Format (
"The service {0} already exists in the service container.",
serviceType.ToString ()), "serviceType");
Services.Add (serviceType, serviceInstance);
}
public virtual
void AddService (Type serviceType,
ServiceCreatorCallback callback,
bool promote)
{
if (promote && parentProvider != null) {
IServiceContainer container = (IServiceContainer)
parentProvider.GetService (typeof (IServiceContainer));
container.AddService (serviceType, callback, promote);
return;
}
if (serviceType == null)
throw new ArgumentNullException ("serviceType");
if (callback == null)
throw new ArgumentNullException ("callback");
if (Services.Contains (serviceType))
throw new ArgumentException (string.Format (
"The service {0} already exists in the service container.",
serviceType.ToString ()), "serviceType");
Services.Add (serviceType, callback);
}
public void RemoveService (Type serviceType)
{
RemoveService (serviceType, false);
}
public virtual void RemoveService (Type serviceType, bool promote)
{
if (promote && parentProvider != null) {
IServiceContainer container = (IServiceContainer)
parentProvider.GetService (typeof (IServiceContainer));
container.RemoveService (serviceType, promote);
return;
}
if (serviceType == null)
throw new ArgumentNullException ("serviceType");
Services.Remove (serviceType);
}
public virtual
object GetService (Type serviceType)
{
object result = null;
Type[] defaultServices = this.DefaultServices;
for (int i=0; i < defaultServices.Length; i++) {
if (defaultServices[i] == serviceType) {
result = this;
break;
}
}
if (result == null)
result = Services [serviceType];
if (result == null && parentProvider != null)
result = parentProvider.GetService (serviceType);
if (result != null) {
ServiceCreatorCallback cb = result as ServiceCreatorCallback;
if (cb != null) {
result = cb (this, serviceType);
Services [serviceType] = result;
}
}
return result;
}
protected virtual
Type [] DefaultServices {
get {
return new Type [] { typeof (IServiceContainer), typeof (ServiceContainer)};
}
}
public void Dispose ()
{
this.Dispose (true);
GC.SuppressFinalize (this);
}
protected virtual void Dispose (bool disposing)
{
if (!_disposed) {
if (disposing) {
if (services != null) {
foreach (object obj in services) {
if (obj is IDisposable) {
((IDisposable) obj).Dispose ();
}
}
services = null;
}
}
_disposed = true;
}
}
}
}
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