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using MediaBrowser.Common.Logging;
using System;
using System.IO;
using System.Linq;
using System.Xml;
namespace MediaBrowser.Common.Serialization
{
/// <summary>
/// Provides a wrapper around third party xml serialization.
/// </summary>
public class XmlSerializer
{
/// <summary>
/// Serializes to writer.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="obj">The obj.</param>
/// <param name="writer">The writer.</param>
public static void SerializeToWriter<T>(T obj, XmlTextWriter writer)
{
writer.Formatting = Formatting.Indented;
var netSerializer = new System.Xml.Serialization.XmlSerializer(typeof(T));
netSerializer.Serialize(writer, obj);
}
/// <summary>
/// Serializes to writer.
/// </summary>
/// <param name="obj">The obj.</param>
/// <param name="writer">The writer.</param>
public static void SerializeToWriter(object obj, XmlTextWriter writer)
{
writer.Formatting = Formatting.Indented;
var netSerializer = new System.Xml.Serialization.XmlSerializer(obj.GetType());
netSerializer.Serialize(writer, obj);
}
/// <summary>
/// Deserializes from stream.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="stream">The stream.</param>
/// <returns>``0.</returns>
public static T DeserializeFromStream<T>(Stream stream)
{
using (var reader = new XmlTextReader(stream))
{
var netSerializer = new System.Xml.Serialization.XmlSerializer(typeof(T));
return (T)netSerializer.Deserialize(reader);
}
}
/// <summary>
/// Deserializes from stream.
/// </summary>
/// <param name="type">The type.</param>
/// <param name="stream">The stream.</param>
/// <returns>System.Object.</returns>
public static object DeserializeFromStream(Type type, Stream stream)
{
using (var reader = new XmlTextReader(stream))
{
var netSerializer = new System.Xml.Serialization.XmlSerializer(type);
return netSerializer.Deserialize(reader);
}
}
/// <summary>
/// Serializes to stream.
/// </summary>
/// <param name="obj">The obj.</param>
/// <param name="stream">The stream.</param>
public static void SerializeToStream(object obj, Stream stream)
{
using (var writer = new XmlTextWriter(stream, null))
{
SerializeToWriter(obj, writer);
}
}
/// <summary>
/// Deserializes from file.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="file">The file.</param>
/// <returns>``0.</returns>
public static T DeserializeFromFile<T>(string file)
{
using (var stream = File.OpenRead(file))
{
return DeserializeFromStream<T>(stream);
}
}
/// <summary>
/// Serializes to file.
/// </summary>
/// <param name="obj">The obj.</param>
/// <param name="file">The file.</param>
public static void SerializeToFile(object obj, string file)
{
using (var stream = new FileStream(file, FileMode.Create))
{
SerializeToStream(obj, stream);
}
}
/// <summary>
/// Deserializes from file.
/// </summary>
/// <param name="type">The type.</param>
/// <param name="file">The file.</param>
/// <returns>System.Object.</returns>
public static object DeserializeFromFile(Type type, string file)
{
using (var stream = File.OpenRead(file))
{
return DeserializeFromStream(type, stream);
}
}
/// <summary>
/// Deserializes from bytes.
/// </summary>
/// <param name="type">The type.</param>
/// <param name="buffer">The buffer.</param>
/// <returns>System.Object.</returns>
public static object DeserializeFromBytes(Type type, byte[] buffer)
{
using (var stream = new MemoryStream(buffer))
{
return DeserializeFromStream(type, stream);
}
}
/// <summary>
/// Serializes to bytes.
/// </summary>
/// <param name="obj">The obj.</param>
/// <returns>System.Byte[][].</returns>
public static byte[] SerializeToBytes(object obj)
{
using (var stream = new MemoryStream())
{
SerializeToStream(obj, stream);
return stream.ToArray();
}
}
/// <summary>
/// Reads an xml configuration file from the file system
/// It will immediately re-serialize and save if new serialization data is available due to property changes
/// </summary>
/// <param name="type">The type.</param>
/// <param name="path">The path.</param>
/// <returns>System.Object.</returns>
public static object GetXmlConfiguration(Type type, string path)
{
Logger.LogInfo("Loading {0} at {1}", type.Name, path);
object configuration;
byte[] buffer = null;
// Use try/catch to avoid the extra file system lookup using File.Exists
try
{
buffer = File.ReadAllBytes(path);
configuration = DeserializeFromBytes(type, buffer);
}
catch (FileNotFoundException)
{
configuration = Activator.CreateInstance(type);
}
// Take the object we just got and serialize it back to bytes
var newBytes = SerializeToBytes(configuration);
// If the file didn't exist before, or if something has changed, re-save
if (buffer == null || !buffer.SequenceEqual(newBytes))
{
Logger.LogInfo("Saving {0} to {1}", type.Name, path);
// Save it after load in case we got new items
File.WriteAllBytes(path, newBytes);
}
return configuration;
}
/// <summary>
/// Reads an xml configuration file from the file system
/// It will immediately save the configuration after loading it, just
/// in case there are new serializable properties
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="path">The path.</param>
/// <returns>``0.</returns>
public static T GetXmlConfiguration<T>(string path)
where T : class
{
return GetXmlConfiguration(typeof(T), path) as T;
}
}
}
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