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//
// System.Configuration.ConfigurationSettings.cs
//
// Author:
// Christopher Podurgiel (cpodurgiel@msn.com)
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
// Eric Lindvall (eric@5stops.com)
//
// (c) Christopher Podurgiel
// (c) 2002 Ximian, Inc. (http://www.ximian.com)
// (c) 2003 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.Collections.Specialized;
using System.IO;
using System.Runtime.CompilerServices;
#if (XML_DEP)
using System.Xml;
using System.Xml.XPath;
#endif
namespace System.Configuration
{
public sealed class ConfigurationSettings
{
static IConfigurationSystem config;
private ConfigurationSettings ()
{
}
public static object GetConfig (string sectionName)
{
lock (typeof (ConfigurationSettings)) {
if (config == null)
config = DefaultConfig.GetInstance ();
}
return config.GetConfig (sectionName);
}
public static NameValueCollection AppSettings
{
get {
object appSettings = GetConfig ("appSettings");
if (appSettings == null)
appSettings = new NameValueCollection ();
return (NameValueCollection) appSettings;
}
}
#if NET_2_0
#if XML_DEP
public static ConnectionStringSettingsCollection ConnectionStrings
{
get {
ConnectionStringsSection connSection = (ConnectionStringsSection) GetConfig ("connectionStrings");
ConnectionStringSettingsCollection connectionStrings = null;
if (connSection != null)
connectionStrings = connSection.ConnectionStrings;
else
connectionStrings = new ConnectionStringSettingsCollection ();
return connectionStrings;
}
}
#endif // XML_DEP
#endif // NET_2_0
// Invoked from System.Web
static IConfigurationSystem ChangeConfigurationSystem (IConfigurationSystem newSystem)
{
if (newSystem == null)
throw new ArgumentNullException ("newSystem");
lock (typeof (ConfigurationSettings)) {
if (config == null)
config = DefaultConfig.GetInstance ();
IConfigurationSystem old = config;
config = newSystem;
return old;
}
}
}
//
// class DefaultConfig: read configuration from machine.config file and application
// config file if available.
//
class DefaultConfig : IConfigurationSystem
{
static DefaultConfig instance;
ConfigurationData config;
private DefaultConfig ()
{
}
public static DefaultConfig GetInstance ()
{
lock (typeof (DefaultConfig)) {
if (instance == null)
instance = new DefaultConfig ();
}
return instance;
}
public object GetConfig (string sectionName)
{
Init ();
return config.GetConfig (sectionName);
}
public void Init ()
{
lock (this) {
if (config != null)
return;
ConfigurationData data = new ConfigurationData ();
if (!data.Load (GetMachineConfigPath ()))
throw new ConfigurationException ("Cannot find " + GetMachineConfigPath ());
string appfile = GetAppConfigPath ();
if (appfile == null) {
config = data;
return;
}
ConfigurationData appData = new ConfigurationData (data);
if (appData.Load (appfile))
config = appData;
else
config = data;
}
}
[MethodImplAttribute(MethodImplOptions.InternalCall)]
extern private static string get_machine_config_path ();
internal static string GetMachineConfigPath ()
{
return get_machine_config_path ();
}
private static string GetAppConfigPath ()
{
AppDomainSetup currentInfo = AppDomain.CurrentDomain.SetupInformation;
string configFile = currentInfo.ConfigurationFile;
if (configFile == null || configFile.Length == 0)
return null;
return configFile;
}
}
enum AllowDefinition
{
Everywhere,
MachineOnly,
MachineToApplication
}
class SectionData
{
public readonly string SectionName;
public readonly string TypeName;
public readonly bool AllowLocation;
public readonly AllowDefinition AllowDefinition;
public string FileName;
public SectionData (string sectionName, string typeName,
bool allowLocation, AllowDefinition allowDefinition)
{
SectionName = sectionName;
TypeName = typeName;
AllowLocation = allowLocation;
AllowDefinition = allowDefinition;
}
}
class ConfigurationData
{
ConfigurationData parent;
Hashtable factories;
Hashtable pending;
string fileName;
static object removedMark = new object ();
static object groupMark = new object ();
static object emptyMark = new object ();
Hashtable cache;
Hashtable FileCache {
get {
if (cache != null)
return cache;
cache = new Hashtable ();
return cache;
}
}
public ConfigurationData () : this (null)
{
}
public ConfigurationData (ConfigurationData parent)
{
this.parent = (parent == this) ? null : parent;
factories = new Hashtable ();
}
public bool Load (string fileName)
{
this.fileName = fileName;
if (fileName == null || !File.Exists (fileName))
return false;
#if (XML_DEP)
XmlTextReader reader = null;
try {
FileStream fs = new FileStream (fileName, FileMode.Open, FileAccess.Read);
reader = new XmlTextReader (fs);
InitRead (reader);
ReadConfigFile (reader);
} catch (ConfigurationException) {
throw;
} catch (Exception e) {
throw new ConfigurationException ("Error reading " + fileName, e);
} finally {
if (reader != null)
reader.Close();
}
#endif
return true;
}
object GetHandler (string sectionName)
{
lock (factories) {
object o = factories [sectionName];
if (o == null || o == removedMark) {
if (parent != null)
return parent.GetHandler (sectionName);
return null;
}
if (o is IConfigurationSectionHandler)
return (IConfigurationSectionHandler) o;
o = CreateNewHandler (sectionName, (SectionData) o);
factories [sectionName] = o;
return o;
}
}
object CreateNewHandler (string sectionName, SectionData section)
{
Type t = Type.GetType (section.TypeName);
if (t == null)
throw new ConfigurationException ("Cannot get Type for " + section.TypeName);
Type iconfig = typeof (IConfigurationSectionHandler);
if (!iconfig.IsAssignableFrom (t))
throw new ConfigurationException (sectionName + " does not implement " + iconfig);
object o = Activator.CreateInstance (t, true);
if (o == null)
throw new ConfigurationException ("Cannot get instance for " + t);
return o;
}
#if (XML_DEP)
XmlDocument GetInnerDoc (XmlDocument doc, int i, string [] sectionPath)
{
if (++i >= sectionPath.Length)
return doc;
if (doc.DocumentElement == null)
return null;
XmlNode node = doc.DocumentElement.FirstChild;
while (node != null) {
if (node.Name == sectionPath [i]) {
ConfigXmlDocument result = new ConfigXmlDocument ();
result.Load (new StringReader (node.OuterXml));
return GetInnerDoc (result, i, sectionPath);
}
node = node.NextSibling;
}
return null;
}
XmlDocument GetDocumentForSection (string sectionName)
{
ConfigXmlDocument doc = new ConfigXmlDocument ();
if (pending == null)
return doc;
string [] sectionPath = sectionName.Split ('/');
string outerxml = pending [sectionPath [0]] as string;
if (outerxml == null)
return doc;
StringReader reader = new StringReader (outerxml);
XmlTextReader rd = new XmlTextReader (reader);
rd.MoveToContent ();
doc.LoadSingleElement (fileName, rd);
return GetInnerDoc (doc, 0, sectionPath);
}
object GetConfigInternal (string sectionName)
{
object handler = GetHandler (sectionName);
IConfigurationSectionHandler iconf = handler as IConfigurationSectionHandler;
if (iconf == null)
return handler;
object parentConfig = null;
if (parent != null)
parentConfig = parent.GetConfig (sectionName);
XmlDocument doc = GetDocumentForSection (sectionName);
if (doc == null || doc.DocumentElement == null)
return parentConfig;
return iconf.Create (parentConfig, fileName, doc.DocumentElement);
}
#else
object GetConfigInternal (string sectionName)
{
return null;
}
#endif
public object GetConfig (string sectionName)
{
object config;
lock (this) {
config = this.FileCache [sectionName];
}
if (config == emptyMark)
return null;
if (config != null)
return config;
lock (this) {
config = GetConfigInternal (sectionName);
this.FileCache [sectionName] = (config == null) ? emptyMark : config;
}
return config;
}
private object LookForFactory (string key)
{
object o = factories [key];
if (o != null)
return o;
if (parent != null)
return parent.LookForFactory (key);
return null;
}
#if (XML_DEP)
private void InitRead (XmlTextReader reader)
{
reader.MoveToContent ();
if (reader.NodeType != XmlNodeType.Element || reader.Name != "configuration")
ThrowException ("Configuration file does not have a valid root element", reader);
if (reader.HasAttributes)
ThrowException ("Unrecognized attribute in root element", reader);
MoveToNextElement (reader);
}
private void MoveToNextElement (XmlTextReader reader)
{
while (reader.Read ()) {
XmlNodeType ntype = reader.NodeType;
if (ntype == XmlNodeType.Element)
return;
if (ntype != XmlNodeType.Whitespace &&
ntype != XmlNodeType.Comment &&
ntype != XmlNodeType.SignificantWhitespace &&
ntype != XmlNodeType.EndElement)
ThrowException ("Unrecognized element", reader);
}
}
private void ReadSection (XmlTextReader reader, string sectionName)
{
string attName;
string nameValue = null;
string typeValue = null;
string allowLoc = null, allowDef = null;
bool allowLocation = true;
AllowDefinition allowDefinition = AllowDefinition.Everywhere;
while (reader.MoveToNextAttribute ()) {
attName = reader.Name;
if (attName == null)
continue;
if (attName == "allowLocation") {
if (allowLoc != null)
ThrowException ("Duplicated allowLocation attribute.", reader);
allowLoc = reader.Value;
allowLocation = (allowLoc == "true");
if (!allowLocation && allowLoc != "false")
ThrowException ("Invalid attribute value", reader);
continue;
}
if (attName == "allowDefinition") {
if (allowDef != null)
ThrowException ("Duplicated allowDefinition attribute.", reader);
allowDef = reader.Value;
try {
allowDefinition = (AllowDefinition) Enum.Parse (
typeof (AllowDefinition), allowDef);
} catch {
ThrowException ("Invalid attribute value", reader);
}
continue;
}
if (attName == "type") {
if (typeValue != null)
ThrowException ("Duplicated type attribute.", reader);
typeValue = reader.Value;
continue;
}
if (attName == "name") {
if (nameValue != null)
ThrowException ("Duplicated name attribute.", reader);
nameValue = reader.Value;
if (nameValue == "location")
ThrowException ("location is a reserved section name", reader);
continue;
}
ThrowException ("Unrecognized attribute.", reader);
}
if (nameValue == null || typeValue == null)
ThrowException ("Required attribute missing", reader);
if (sectionName != null)
nameValue = sectionName + '/' + nameValue;
reader.MoveToElement();
object o = LookForFactory (nameValue);
if (o != null && o != removedMark)
ThrowException ("Already have a factory for " + nameValue, reader);
SectionData section = new SectionData (nameValue, typeValue, allowLocation, allowDefinition);
section.FileName = fileName;
factories [nameValue] = section;
MoveToNextElement (reader);
}
private void ReadRemoveSection (XmlTextReader reader, string sectionName)
{
if (!reader.MoveToNextAttribute () || reader.Name != "name")
ThrowException ("Unrecognized attribute.", reader);
string removeValue = reader.Value;
if (removeValue == null || removeValue.Length == 0)
ThrowException ("Empty name to remove", reader);
reader.MoveToElement ();
if (sectionName != null)
removeValue = sectionName + '/' + removeValue;
object o = LookForFactory (removeValue);
if (o != null && o == removedMark)
ThrowException ("No factory for " + removeValue, reader);
factories [removeValue] = removedMark;
MoveToNextElement (reader);
}
private void ReadSectionGroup (XmlTextReader reader, string configSection)
{
if (!reader.MoveToNextAttribute ())
ThrowException ("sectionGroup must have a 'name' attribute.", reader);
if (reader.Name != "name")
ThrowException ("Unrecognized attribute.", reader);
if (reader.MoveToNextAttribute ())
ThrowException ("Unrecognized attribute.", reader);
string value = reader.Value;
if (value == "location")
ThrowException ("location is a reserved section name", reader);
if (configSection != null)
value = configSection + '/' + value;
object o = LookForFactory (value);
if (o != null && o != removedMark && o != groupMark)
ThrowException ("Already have a factory for " + value, reader);
factories [value] = groupMark;
MoveToNextElement (reader);
ReadSections (reader, value);
}
private void ReadSections (XmlTextReader reader, string configSection)
{
int depth = reader.Depth;
while (reader.Depth == depth) {
string name = reader.Name;
if (name == "section") {
ReadSection (reader, configSection);
continue;
}
if (name == "remove") {
ReadRemoveSection (reader, configSection);
continue;
}
if (name == "clear") {
if (reader.HasAttributes)
ThrowException ("Unrecognized attribute.", reader);
factories.Clear ();
MoveToNextElement (reader);
continue;
}
if (name == "sectionGroup") {
ReadSectionGroup (reader, configSection);
continue;
}
ThrowException ("Unrecognized element: " + reader.Name, reader);
}
}
void StorePending (string name, XmlTextReader reader)
{
if (pending == null)
pending = new Hashtable ();
pending [name] = reader.ReadOuterXml ();
}
private void ReadConfigFile (XmlTextReader reader)
{
int depth = reader.Depth;
while (!reader.EOF && reader.Depth == depth) {
string name = reader.Name;
if (name == "configSections") {
if (reader.HasAttributes)
ThrowException ("Unrecognized attribute in <configSections>.", reader);
MoveToNextElement (reader);
if (reader.Depth > depth)
ReadSections (reader, null);
} else if (name != null && name != "") {
StorePending (name, reader);
MoveToNextElement (reader);
} else {
MoveToNextElement (reader);
}
}
}
private void ThrowException (string text, XmlTextReader reader)
{
throw new ConfigurationException (text, fileName, reader.LineNumber);
}
#endif
}
}
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