PropertyBag.cs :  » IDEs » MonoDevelop » MonoDevelop » Core » C# / CSharp Open Source

// PropertyBag.cs
//
// Author:
//   Lluis Sanchez Gual <lluis@novell.com>
//
// Copyright (c) 2008 Novell, Inc (http://www.novell.com)
//
// 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.Xml;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using MonoDevelop.Core.Serialization;

namespace MonoDevelop.Core{
  [DataItem ("Properties")]
  public class PropertyBag: ICustomDataItem, IDisposable
  {
    Dictionary<string,object> properties;
    DataContext context;
    string sourceFile;
    
    public PropertyBag()
    {
    }
    
    public bool IsEmpty {
      get { return properties == null || properties.Count == 0; }
    }
    
    public T GetValue<T> ()
    {
      return GetValue<T> (typeof(T).FullName);
    }
    
    public T GetValue<T> (string name)
    {
      return GetValue<T> (name, (DataContext) null);
    }
    
    public T GetValue<T> (string name, DataContext ctx)
    {
      if (properties != null) {
        object val;
        if (properties.TryGetValue (name, out val)) {
          if (val is DataNode) {
            val = Deserialize (name, (DataNode) val, typeof(T), ctx ?? context);
            properties [name] = val;
          }
          return (T) val;
        }
      }
      return default (T);
    }
    
    public T GetValue<T> (string name, T defaultValue)
    {
      return GetValue<T> (name, defaultValue, null);
    }
    
    public T GetValue<T> (string name, T defaultValue, DataContext ctx)
    {
      if (properties != null) {
        object val;
        if (properties.TryGetValue (name, out val)) {
          if (val is DataNode) {
            val = Deserialize (name, (DataNode) val, typeof(T), ctx ?? context);
            properties [name] = val;
          }
          return (T) val;
        }
      }
      return defaultValue;
    }
    
    public void SetValue<T> (T value)
    {
      SetValue<T> (typeof(T).FullName, value);
    }
    
    public void SetValue<T> (string name, T value)
    {
      if (properties == null)
        properties = new Dictionary<string,object> ();
      properties [name] = value;
    }
    
    public bool RemoveValue<T> ()
    {
      return RemoveValue (typeof(T).FullName);
    }
    
    public bool RemoveValue (string name)
    {
      return properties.Remove (name);
    }
    
    public bool HasValue<T> ()
    {
      return HasValue (typeof(T).FullName);
    }
    
    public bool HasValue (string name)
    {
      return properties != null && properties.ContainsKey (name);
    }
    
    void IDisposable.Dispose ()
    {
      if (properties != null) {
        foreach (object ob in properties.Values) {
          IDisposable disp = ob as IDisposable;
          if (disp != null)
            disp.Dispose ();
        }
        properties = null;
      }
    }
    
    object Deserialize (string name, DataNode node, Type type, DataContext ctx)
    {
      if (type.IsAssignableFrom (typeof(XmlElement))) {
        // The xml content is the first child of the data node
        DataItem it = node as DataItem;
        if (it == null || it.ItemData.Count > 1)
          throw new InvalidOperationException ("Can't convert property to an XmlElement object.");
        if (it.ItemData.Count == 0)
          return null;
        XmlConfigurationWriter sw = new XmlConfigurationWriter ();
        XmlDocument doc = new XmlDocument ();
        return sw.Write (doc, it.ItemData [0]);
      }
      if (ctx == null)
        throw new InvalidOperationException ("Can't deserialize property '" + name + "'. Serialization context not set.");
      
      DataSerializer ser = new DataSerializer (ctx);
      ser.SerializationContext.BaseFile = sourceFile;
      object ob = ser.Deserialize (type, node);
      return ob;
    }

    DataCollection ICustomDataItem.Serialize (ITypeSerializer handler)
    {
      DataCollection data = new DataCollection ();
      foreach (KeyValuePair<string,object> entry in properties) {
        DataNode val;
        if (entry.Value == null)
          continue;
        else if (entry.Value is XmlElement) {
          DataItem xit = new DataItem ();
          XmlConfigurationReader sr = new XmlConfigurationReader ();
          xit.ItemData.Add (sr.Read ((XmlElement)entry.Value));
          val = xit;
        }
        else if (entry.Value is DataNode) {
          val = (DataNode) entry.Value;
        } else {
          val = handler.SerializationContext.Serializer.Serialize (entry.Value, typeof(object));
        }
        val.Name = entry.Key;
        data.Add (val);
      }
      return data;
    }

    void ICustomDataItem.Deserialize (ITypeSerializer handler, DataCollection data)
    {
      if (data.Count == 0)
        return;
      
      properties = new Dictionary<string,object> ();
      context = handler.SerializationContext.Serializer.DataContext;
      sourceFile = handler.SerializationContext.BaseFile;
      foreach (DataNode nod in data) {
        if (nod.Name != "ctype")
          properties [nod.Name] = nod;
      }
    }
  }
}