using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using System.Xml;
using System.IO;
using System.Security.Permissions;
using System.Configuration;
namespace Koossery.MVCwin.Util
{
///
/// Read an XML file from the xml element and the xml attribute
///
public class XmlUtility
{
// Fields
private static volatile Hashtable _configFileHashTable;
private const string PROTOCOL_SEPARATOR = "://";
// Methods
static XmlUtility()
{
_configFileHashTable = null;
}
public XmlUtility()
{
}
private static bool FileExists(string filePath)
{
if (File.Exists(filePath))
{
return true;
}
FileIOPermission permission = null;
try
{
permission = new FileIOPermission(FileIOPermissionAccess.Read, filePath);
}
catch
{
return false;
}
try
{
permission.Demand();
}
catch (Exception exception)
{
throw new ConfigurationException(string.Format("Doesn't have the right to read the config file \"{0}\". Cause : {1}", filePath, exception.Message), exception);
}
return false;
}
private static XmlDocument GetConfigAsXmlDocument(string resourcePath)
{
XmlDocument document = new XmlDocument();
XmlTextReader reader = null;
try
{
try
{
reader = new XmlTextReader(resourcePath);
document.Load(reader);
}
catch (Exception exception)
{
throw new ConfigurationException(string.Format("Unable to load config file \"{0}\". Cause : {1}", resourcePath, exception.Message), exception);
}
}
finally
{
if (reader != null)
{
reader.Close();
}
}
return document;
}
private static string GetFileSystemResourceWithoutProtocol(string filePath)
{
int index = filePath.IndexOf("://");
if (index == -1)
{
return filePath;
}
if (filePath.Length > (index + "://".Length))
{
while (filePath[++index] == '/')
{
}
}
return filePath.Substring(index);
}
public static string getKeyValueFromXmlConfigFile(string configFileName, string xmlNodeName, string key)
{
string attribute;
try
{
configFileName = GetFileSystemResourceWithoutProtocol(configFileName);
XmlDocument document = null;
if (_configFileHashTable != null)
{
document = (XmlDocument)_configFileHashTable[configFileName];
}
if ((document == null) || (_configFileHashTable == null))
{
lock (typeof(Hashtable))
{
if ((document == null) || (_configFileHashTable == null))
{
LoadAndCacheXmlConfigFile(configFileName);
document = (XmlDocument)_configFileHashTable[configFileName];
}
}
}
XmlNodeList elementsByTagName = document.GetElementsByTagName(xmlNodeName);
XmlNodeReader reader = null;
attribute = null;
foreach (XmlNode node in elementsByTagName)
{
reader = new XmlNodeReader(node);
reader.Read();
attribute = reader.GetAttribute(key);
attribute.Trim();
}
}
catch (Exception exception)
{
throw new ConfigurationException("Message not found for key =" + key + ": " + exception.Message);
}
return attribute;
}
private static void LoadAndCacheXmlConfigFile(string xmlConfigFile)
{
xmlConfigFile = GetFileSystemResourceWithoutProtocol(xmlConfigFile);
FileExists(xmlConfigFile);
XmlDocument configAsXmlDocument = GetConfigAsXmlDocument(xmlConfigFile);
if (_configFileHashTable == null)
{
_configFileHashTable = new Hashtable();
}
_configFileHashTable[xmlConfigFile] = configAsXmlDocument;
}
}
}