/// <summary>
/// Saves current values in the <see cref="dataStore"/> to a xml file using Linq.
/// </summary>
private void Write()
{
// get path to settings file
var directoryName = Path.GetDirectoryName(this.FileName);
// check to ensure that the directory exists
if (directoryName != null && !Directory.Exists(directoryName))
{
Directory.CreateDirectory(directoryName);
}
// create a XmlDocument to store the settings in
var doc = new XmlDocument();
var declaration = doc.CreateXmlDeclaration("1.0", null, null);
// create root settings element
var settings = doc.CreateElement("settings");
doc.AppendChild(settings);
doc.InsertBefore(declaration, doc.DocumentElement);
// read existing settings file values
var existingValues = XmlDocumentSettingsHelpers.ReadSettings(this.FileName, true);
// setup a comparer and merge the existing values from the xml file to the settings currently being managed
var comparer =
EqualityComparerCallback <KeyValuePair <string, object> > .Compare(
(x, y) => string.CompareOrdinal(x.Key, y.Key) == 0);
var entries = this.dataStore.Union(existingValues, comparer);
// create series of entries for each setting in the XmlDocument object
var nodesToWrite = entries.OrderBy(x => x.Key).Select(
x =>
{
var entry = doc.CreateElement("entry");
entry.InnerText = x.Value.ToString();
var key = doc.CreateAttribute("key");
key.InnerText = x.Key;
entry.Attributes.Append(key);
return(entry);
});
// add nodes to settings root node
foreach (var node in nodesToWrite)
{
settings.AppendChild(node);
}
// save the XmlDocument to an xml file
doc.Save(this.FileName);
// if we are not compiling against the unity web player then record the last write time
#if !UNITY_WEBPLAYER
this.lastWriteTime = File.GetLastWriteTime(this.FileName);
#endif
}
/// <summary>
/// Reads values into the <see cref="dataStore"/> field using Linq.
/// </summary>
/// <exception cref="FileNotFoundException">
/// If the xml file where settings are saved no longer exists.
/// </exception>
/// <exception cref="FileLoadException">
/// If the xml settings file could not be read properly.
/// </exception>
private void Read()
{
#if !UNITY_WEBPLAYER
// only update reading settings file every 5 seconds
if (DateTime.Now < this.lastReadTime + TimeSpan.FromSeconds(this.readDelayInSeconds))
{
return;
}
#endif
// check if the file exists
if (!File.Exists(this.FileName))
{
throw new FileNotFoundException("Could not find settings file.", this.FileName);
}
// if we are not compiling against the unity web player then check if last write time is greater then the files write time
#if !UNITY_WEBPLAYER
var info = new FileInfo(this.FileName);
var writeTime = info.LastWriteTime;
// check if the file has been written to since last read attempt
if (writeTime <= this.lastWriteTime)
{
return;
}
#endif
// try to read settings
var results = XmlDocumentSettingsHelpers.ReadSettings(this.FileName, true);
// store the settings
this.dataStore = results.ToDictionary(k => k.Key, v => v.Value);
// if we are not compiling against the unity web player then record the write time
#if !UNITY_WEBPLAYER
this.lastWriteTime = writeTime;
this.lastReadTime = DateTime.Now;
#endif
}
