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//------------------------------------------------------------------------------
// <copyright file="ControlCachePolicy.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI {
using System;
using System.IO;
using System.Text;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Globalization;
using System.Web;
using System.Web.Util;
using System.Web.UI.WebControls;
using System.Web.Caching;
using System.Security.Permissions;
public sealed class ControlCachePolicy {
private static ControlCachePolicy _cachePolicyStub = new ControlCachePolicy();
private BasePartialCachingControl _pcc;
internal ControlCachePolicy() {
}
internal ControlCachePolicy(BasePartialCachingControl pcc) {
_pcc = pcc;
}
internal static ControlCachePolicy GetCachePolicyStub() {
// Return a stub, which returns SupportsCaching==false and throws on everything else.
return _cachePolicyStub;
}
// Check whether it is valid to access properties on this object
private void CheckValidCallingContext() {
// If it's not being cached, the CachePolicy can't be used
if (_pcc == null) {
throw new HttpException(
SR.GetString(SR.UC_not_cached));
}
// Make sure it's not being used too late
if (_pcc.ControlState >= ControlState.PreRendered) {
throw new HttpException(
SR.GetString(SR.UCCachePolicy_unavailable));
}
}
public bool SupportsCaching {
get {
// Caching is supported if we have a PartialCachingControl
return (_pcc != null);
}
}
public bool Cached {
get {
CheckValidCallingContext();
return !_pcc._cachingDisabled;
}
set {
CheckValidCallingContext();
_pcc._cachingDisabled = !value;
}
}
public TimeSpan Duration {
get {
CheckValidCallingContext();
return _pcc.Duration;
}
set {
CheckValidCallingContext();
_pcc.Duration = value;
}
}
public HttpCacheVaryByParams VaryByParams {
get {
CheckValidCallingContext();
return _pcc.VaryByParams;
}
}
public string VaryByControl {
get {
CheckValidCallingContext();
return _pcc.VaryByControl;
}
set {
CheckValidCallingContext();
_pcc.VaryByControl = value;
}
}
public CacheDependency Dependency {
get {
CheckValidCallingContext();
return _pcc.Dependency;
}
set {
CheckValidCallingContext();
_pcc.Dependency = value;
}
}
public void SetVaryByCustom(string varyByCustom) {
CheckValidCallingContext();
_pcc._varyByCustom = varyByCustom;
}
public void SetSlidingExpiration(bool useSlidingExpiration) {
CheckValidCallingContext();
_pcc._useSlidingExpiration = useSlidingExpiration;
}
public void SetExpires(DateTime expirationTime) {
CheckValidCallingContext();
_pcc._utcExpirationTime = DateTimeUtil.ConvertToUniversalTime(expirationTime);
}
public String ProviderName {
get {
CheckValidCallingContext();
if (_pcc._provider == null) {
return OutputCache.ASPNET_INTERNAL_PROVIDER_NAME;
}
else {
return _pcc._provider;
}
}
set {
CheckValidCallingContext();
if (value == OutputCache.ASPNET_INTERNAL_PROVIDER_NAME) {
value = null;
}
OutputCache.ThrowIfProviderNotFound(value);
_pcc._provider = value;
}
}
}
}
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