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// --------------------------------------------------------------------------------------------------------------------
// <copyright file="UserSettingService.cs" company="HandBrake Project (http://handbrake.fr)">
// This file is part of the HandBrake source code - It may be used under the terms of the GNU General Public License.
// </copyright>
// <summary>
// The User Setting Serivce
// </summary>
// --------------------------------------------------------------------------------------------------------------------
namespace HandBrake.ApplicationServices.Services
{
using System;
using System.Collections.Specialized;
using System.IO;
using System.Linq;
using System.Xml.Serialization;
using HandBrake.ApplicationServices.Collections;
using HandBrake.ApplicationServices.EventArgs;
using HandBrake.ApplicationServices.Exceptions;
using HandBrake.ApplicationServices.Services.Interfaces;
/// <summary>
/// The User Setting Serivce
/// </summary>
public class UserSettingService : IUserSettingService
{
/// <summary>
/// The Settings File
/// </summary>
private readonly string settingsFile = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + "\\HandBrake\\settings.xml";
/// <summary>
/// The XML Serializer
/// </summary>
readonly XmlSerializer serializer = new XmlSerializer(typeof(SerializableDictionary<string, object>));
/// <summary>
/// The User Settings
/// </summary>
private SerializableDictionary<string, object> userSettings;
/// <summary>
/// Initializes a new instance of the <see cref="UserSettingService"/> class.
/// </summary>
public UserSettingService()
{
this.Load();
}
/// <summary>
/// The setting changed.
/// </summary>
public event SettingEventHandler SettingChanged;
/// <summary>
/// Set the specified user setting.
/// </summary>
/// <param name="name">
/// Name of the property
/// </param>
/// <param name="value">
/// The value to store.
/// </param>
public void SetUserSetting(string name, object value)
{
this.userSettings[name] = value;
this.Save();
this.OnSettingChanged(new SettingChangedEventArgs {Key = name, Value = value});
}
/// <summary>
/// Get user setting for a given key.
/// </summary>
/// <param name="name">
/// The name.
/// </param>
/// <typeparam name="T">
/// The Type of the setting
/// </typeparam>
/// <returns>
/// The user setting
/// </returns>
public T GetUserSetting<T>(string name)
{
if (this.userSettings.ContainsKey(name))
{
return (T)this.userSettings[name];
}
return default(T);
}
/// <summary>
/// Get an StringCollection type user setting
/// </summary>
/// <param name="name">
/// The setting name
/// </param>
/// <returns>
/// The settings value
/// </returns>
public StringCollection GetUserSettingStringCollection(string name)
{
return (StringCollection)this.userSettings[name];
}
/// <summary>
/// The on setting changed.
/// </summary>
/// <param name="e">
/// The e.
/// </param>
protected virtual void OnSettingChanged(SettingChangedEventArgs e)
{
SettingEventHandler handler = this.SettingChanged;
if (handler != null)
{
handler(this, e);
}
}
/// <summary>
/// Save the User Settings
/// </summary>
private void Save()
{
try
{
string directory = Path.GetDirectoryName(this.settingsFile);
if (!string.IsNullOrEmpty(directory) && !Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}
using (FileStream strm = new FileStream(this.settingsFile, FileMode.Create, FileAccess.Write))
{
serializer.Serialize(strm, this.userSettings);
}
}
catch (Exception exc)
{
throw new GeneralApplicationException(
"A problem occured when trying to save your preferences.",
"Any settings you changed may need to be reset the next time HandBrake launches.",
exc);
}
}
/// <summary>
/// Load the User Settings
/// </summary>
private void Load()
{
try
{
// Load up the users current settings file.
if (File.Exists(this.settingsFile))
{
using (StreamReader reader = new StreamReader(this.settingsFile))
{
SerializableDictionary<string, object> data = (SerializableDictionary<string, object>)serializer.Deserialize(reader);
this.userSettings = data;
}
}
else
{
this.userSettings = new SerializableDictionary<string, object>();
}
// Add any missing / new settings
SerializableDictionary<string, object> defaults = this.GetDefaults();
foreach (var item in defaults.Where(item => !this.userSettings.Keys.Contains(item.Key)))
{
this.userSettings.Add(item.Key, item.Value);
this.Save();
}
}
catch (Exception exc)
{
try
{
this.userSettings = this.GetDefaults();
if (File.Exists(this.settingsFile))
{
File.Delete(this.settingsFile);
}
this.Save();
throw new GeneralApplicationException("Warning, your settings have been reset!", "Your user settings file was corrupted or inaccessible. Settings have been reset to defaults.", exc);
}
catch (Exception)
{
throw new GeneralApplicationException("Unable to load user settings.", "Your user settings file appears to be inaccessible or corrupted. You may have to delete the file and let HandBrake generate a new one.", exc);
}
}
}
/// <summary>
/// Load Default Settings
/// </summary>
/// <returns>
/// The get defaults.
/// </returns>
private SerializableDictionary<string, object> GetDefaults()
{
if (File.Exists("defaultsettings.xml"))
{
using (StreamReader reader = new StreamReader("defaultsettings.xml"))
{
return (SerializableDictionary<string, object>)serializer.Deserialize(reader);
}
}
return new SerializableDictionary<string, object>();
}
}
}
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