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//
// System.Web.UI.BasePartialCachingControl.cs
//
// Author:
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
// Jackson Harper (jackson@ximian.com)
//
// (C) 2003 Andreas Nahr
// (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.IO;
using System.Text;
using System.ComponentModel;
using System.Web.Caching;
namespace System.Web.UI
{
[ToolboxItem (false)]
public abstract class BasePartialCachingControl : Control
{
private CacheDependency dependency;
private string ctrl_id;
private string guid;
private int duration;
private string varyby_params;
private string varyby_controls;
private string varyby_custom;
private Control control;
protected BasePartialCachingControl()
{
}
internal string CtrlID {
get { return ctrl_id; }
set { ctrl_id = value; }
}
internal string Guid {
get { return guid; }
set { guid = value; }
}
internal int Duration {
get { return duration; }
set { duration = value; }
}
internal string VaryByParams {
get { return varyby_params; }
set { varyby_params = value; }
}
internal string VaryByControls {
get { return varyby_controls; }
set { varyby_controls = value; }
}
internal string VaryByCustom {
get { return varyby_custom; }
set { varyby_custom = value; }
}
internal abstract Control CreateControl ();
public override void Dispose ()
{
if (dependency != null) {
dependency.Dispose ();
dependency = null;
}
}
protected override void OnInit (EventArgs e)
{
control = CreateControl ();
Controls.Add (control);
}
protected override void Render (HtmlTextWriter output)
{
Cache cache = HttpRuntime.Cache;
string key = CreateKey ();
string data = cache [key] as string;
if (data != null) {
output.Write (data);
return;
}
HttpContext context = HttpContext.Current;
StringWriter writer = new StringWriter ();
TextWriter prev = context.Response.SetTextWriter (writer);
HtmlTextWriter txt_writer = new HtmlTextWriter (writer);
string text;
try {
control.RenderControl (txt_writer);
} finally {
text = writer.ToString ();
context.Response.SetTextWriter (prev);
output.Write (text);
}
context.Cache.InsertPrivate (key, text, dependency,
DateTime.Now.AddSeconds (duration),
Cache.NoSlidingExpiration,
CacheItemPriority.Normal, null);
}
public CacheDependency Dependency {
get {return dependency;}
set {dependency = value;}
}
private string CreateKey ()
{
StringBuilder builder = new StringBuilder ();
HttpContext context = HttpContext.Current;
builder.Append ("PartialCachingControl\n");
builder.Append ("GUID: " + guid + "\n");
if (varyby_params != null && varyby_params.Length > 0) {
string[] prms = varyby_params.Split (';');
for (int i=0; i<prms.Length; i++) {
string val = context.Request.Params [prms [i]];
builder.Append ("VP:");
builder.Append (prms [i]);
builder.Append ('=');
builder.Append (val != null ? val : "__null__");
builder.Append ('\n');
}
}
if (varyby_controls != null && varyby_params.Length > 0) {
string[] prms = varyby_controls.Split (';');
for (int i=0; i<prms.Length; i++) {
string val = context.Request.Params [prms [i]];
builder.Append ("VCN:");
builder.Append (prms [i]);
builder.Append ('=');
builder.Append (val != null ? val : "__null__");
builder.Append ('\n');
}
}
if (varyby_custom != null) {
string val = context.ApplicationInstance.GetVaryByCustomString (context,
varyby_custom);
builder.Append ("VC:");
builder.Append (varyby_custom);
builder.Append ('=');
builder.Append (val != null ? val : "__null__");
builder.Append ('\n');
}
return builder.ToString ();
}
}
}
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