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//
// Configuration.cs
//
// Author:
// Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
// Copyright (c) 2013-2017 Jean-Philippe Bruyère
//
// 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.Reflection;
using System.IO;
using System.Collections.Generic;
using System.Threading;
namespace Crow
{
/// <summary>
/// single element of configuration
/// </summary>
public class ConfigItem {
Type type;
internal object curVal;
bool parsingNeeded = false;
public ConfigItem(object newVal){
curVal = newVal;
}
public ConfigItem(string newVal){
curVal = newVal;
parsingNeeded = true;
}
public T GetValue<T>(){
if (type == null)
type = typeof(T);
if (parsingNeeded) {
MethodInfo miParse = type.GetMethod ("Parse", new Type[] {typeof(string)});
if (miParse != null)
curVal = miParse.Invoke (null, new object[]{ curVal });
parsingNeeded = false;
}
return (T)Convert.ChangeType (curVal, type);
}
public void Set(object value){
curVal = value;
}
}
/// <summary>
/// Application wide Configuration store utility
///
/// configuration files are automatically stored in **_user/.config/appname/app.config_** on close and every minutes
/// if some items have changed.
/// New items are automaticaly added on first use. Configuration class expose one templated Get and one Templated Set, so
/// creating, storing and retrieving config items is simple as:
///
/// ```csharp\n
/// //storing\n
/// Configuration.Global.Set ("Option1", 42);\n
/// //loading\n
/// int op1 = Configuration.Global.Get<int> ("Option1");\n
/// ```\n
/// </summary>
///
/// **.config** file are simple text files with per line, a key/value pair of the form `option=value`. Keys have to be unique
/// in the application scope.
///
/// When running the application for the first time, some default options may be necessary. Their can be defined
/// in a special embedded resource text file with the key '**appname.default.config**'
public class Configuration
{
volatile bool isDirty = false;
string configPath;
Dictionary<string, ConfigItem> items = new Dictionary<string, ConfigItem> ();
static Configuration globalConfig;
public static Configuration Global { get { return globalConfig; } }
public Configuration (string path, Stream defaultConf = null) {
configPath = path;
if (File.Exists (configPath)) {
using (Stream s = new FileStream (configPath, FileMode.Open))
load (s);
} else if (defaultConf != null) {
load (defaultConf);
}
startSavingThread ();
}
static Configuration ()
{
string configRoot =
Path.Combine(
Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
".config");
Assembly a = Assembly.GetEntryAssembly ();
string appName = a.GetName().Name;
string globalConfigPath = Path.Combine (configRoot, appName);
if (!Directory.Exists (globalConfigPath))
Directory.CreateDirectory (globalConfigPath);
globalConfigPath = Path.Combine (globalConfigPath, "global.config");
string defaultConfigResID = appName + ".default.config";
foreach (string resIds in a.GetManifestResourceNames()) {
if (string.Equals (defaultConfigResID, resIds, StringComparison.OrdinalIgnoreCase)) {
using (Stream s = a.GetManifestResourceStream (defaultConfigResID))
globalConfig = new Configuration (globalConfigPath, s);
return;
}
}
globalConfig = new Configuration (globalConfigPath);
}
void startSavingThread(){
Thread t = new Thread (savingThread);
t.IsBackground = true;
t.Start ();
}
void savingThread(){
while(true){
if (isDirty) {
save ();
isDirty = false;
}
Thread.Sleep (1000);
}
}
/// <summary>
/// retrive the value of the configuration key given in parameter
/// </summary>
/// <param name="key">option name</param>
public T Get<T>(string key)
{
return !items.ContainsKey (key) ? default(T) : items [key].GetValue<T> ();
}
/// <summary>
/// store the value of the configuration key given in parameter
/// </summary>
/// <param name="key">option name</param>
/// <param name="value">value for that option</param>
public void Set<T>(string key, T value)
{
if (!items.ContainsKey (key)) {
lock(items)
items[key] = new ConfigItem (value);
}else
items[key].Set (value);
isDirty = true;
}
void save(){
using (Stream s = new FileStream(configPath,FileMode.Create)){
using (StreamWriter sw = new StreamWriter (s)) {
lock (items) {
foreach (string key in items.Keys) {
sw.WriteLine (key + "=" + (string)items [key].curVal.ToString ());
}
}
}
}
}
void load(Stream s){
using (StreamReader sr = new StreamReader (s)) {
while (!sr.EndOfStream) {
string l = sr.ReadLine();
if (string.IsNullOrEmpty (l.Trim ()))
continue;
string[] tmp = l.Trim ().Split ('=');
if (tmp.Length != 2)
continue;
items[tmp [0].Trim ()] = new ConfigItem(tmp [1].Trim ());
}
}
}
}
}
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