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//------------------------------------------------------------------------------
// <copyright file="BrowserCapabilitiesFactoryBase.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
/*
* Base class for browser capabilities object: just a read-only dictionary
* holder that supports Init()
*
*
*/
using System.Web.UI;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Globalization;
using System.Security.Permissions;
using System.Text;
using System.Text.RegularExpressions;
using System.Web.Util;
namespace System.Web.Configuration {
public class BrowserCapabilitiesFactoryBase {
private IDictionary _matchedHeaders;
private IDictionary _browserElements;
private object _lock = new object();
public BrowserCapabilitiesFactoryBase() {
}
[EditorBrowsable(EditorBrowsableState.Advanced)]
protected IDictionary BrowserElements {
get {
if (_browserElements == null)
lock (_lock) {
if (_browserElements == null) {
Hashtable browserElements = Hashtable.Synchronized(new Hashtable(StringComparer.OrdinalIgnoreCase));
PopulateBrowserElements(browserElements);
_browserElements = browserElements;
}
}
return _browserElements;
}
}
[EditorBrowsable(EditorBrowsableState.Advanced)]
protected virtual void PopulateBrowserElements(IDictionary dictionary) {
}
internal IDictionary InternalGetMatchedHeaders() {
return MatchedHeaders;
}
internal IDictionary InternalGetBrowserElements() {
return BrowserElements;
}
[EditorBrowsable(EditorBrowsableState.Advanced)]
protected IDictionary MatchedHeaders {
get {
if (_matchedHeaders == null)
lock (_lock) {
if (_matchedHeaders == null) {
Hashtable matchedHeaders = Hashtable.Synchronized(new Hashtable(24, StringComparer.OrdinalIgnoreCase));
PopulateMatchedHeaders(matchedHeaders);
_matchedHeaders = matchedHeaders;
}
}
return _matchedHeaders;
}
}
[EditorBrowsable(EditorBrowsableState.Advanced)]
protected virtual void PopulateMatchedHeaders(IDictionary dictionary) {
}
internal int CompareFilters(string filter1, string filter2) {
bool isFilter1DefaultFilter = String.IsNullOrEmpty(filter1);
bool isFilter2DefaultFilter = String.IsNullOrEmpty(filter2);
IDictionary browsers = BrowserElements;
bool filter1Exists = (browsers.Contains(filter1)) || isFilter1DefaultFilter;
bool filter2Exists = (browsers.Contains(filter2)) || isFilter2DefaultFilter;
if (!filter1Exists) {
if (!filter2Exists) {
return 0;
}
else {
return -1;
}
}
else {
if (!filter2Exists) {
return 1;
}
}
if (isFilter1DefaultFilter && !isFilter2DefaultFilter) {
return 1;
}
if (isFilter2DefaultFilter && !isFilter1DefaultFilter) {
return -1;
}
if (isFilter1DefaultFilter && isFilter2DefaultFilter) {
return 0;
}
int filter1Depth = (int)((Triplet)BrowserElements[filter1]).Third;
int filter2Depth = (int)((Triplet)BrowserElements[filter2]).Third;
return filter2Depth - filter1Depth;
}
public virtual void ConfigureBrowserCapabilities(NameValueCollection headers, HttpBrowserCapabilities browserCaps) {
}
// CodeGenerator will override this function to declare custom browser capabilities
public virtual void ConfigureCustomCapabilities(NameValueCollection headers, HttpBrowserCapabilities browserCaps) {
}
internal static string GetBrowserCapKey(IDictionary headers, HttpRequest request) {
StringBuilder sb = new StringBuilder();
foreach(String key in headers.Keys) {
if (key.Length == 0) {
sb.Append(HttpCapabilitiesDefaultProvider.GetUserAgent(request));
}
else {
sb.Append(request.Headers[key]);
}
sb.Append("\n");
}
return sb.ToString();
}
internal HttpBrowserCapabilities GetHttpBrowserCapabilities(HttpRequest request) {
if (request == null)
throw new ArgumentNullException("request");
NameValueCollection headers = request.Headers;
HttpBrowserCapabilities browserCaps = new HttpBrowserCapabilities();
Hashtable values = new Hashtable(180, StringComparer.OrdinalIgnoreCase);
values[String.Empty] = HttpCapabilitiesDefaultProvider.GetUserAgent(request);
browserCaps.Capabilities = values;
ConfigureBrowserCapabilities(headers, browserCaps);
ConfigureCustomCapabilities(headers, browserCaps);
return browserCaps;
}
protected bool IsBrowserUnknown(HttpCapabilitiesBase browserCaps) {
// We want to ignore the "Default" node, which will also be matched.
if(browserCaps.Browsers == null || browserCaps.Browsers.Count <= 1) {
return true;
}
return false;
}
}
}
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