File: JPropertyDescriptor.cs

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#region License
// Copyright (c) 2007 James Newton-King
//
// 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.
#endregion

#if !SILVERLIGHT && !NETFX_CORE
using System;
using System.ComponentModel;
using Newtonsoft.Json.Utilities;

namespace Newtonsoft.Json.Linq
{
  /// <summary>
  /// Represents a view of a <see cref="JProperty"/>.
  /// </summary>
  public class JPropertyDescriptor : PropertyDescriptor
  {
    private readonly Type _propertyType;

    /// <summary>
    /// Initializes a new instance of the <see cref="JPropertyDescriptor"/> class.
    /// </summary>
    /// <param name="name">The name.</param>
    /// <param name="propertyType">Type of the property.</param>
    public JPropertyDescriptor(string name, Type propertyType)
      : base(name, null)
    {
      ValidationUtils.ArgumentNotNull(name, "name");
      ValidationUtils.ArgumentNotNull(propertyType, "propertyType");

      _propertyType = propertyType;
    }

    private static JObject CastInstance(object instance)
    {
      return (JObject)instance;
    }

    /// <summary>
    /// When overridden in a derived class, returns whether resetting an object changes its value.
    /// </summary>
    /// <returns>
    /// true if resetting the component changes its value; otherwise, false.
    /// </returns>
    /// <param name="component">The component to test for reset capability. 
    ///                 </param>
    public override bool CanResetValue(object component)
    {
      return false;
    }

    /// <summary>
    /// When overridden in a derived class, gets the current value of the property on a component.
    /// </summary>
    /// <returns>
    /// The value of a property for a given component.
    /// </returns>
    /// <param name="component">The component with the property for which to retrieve the value. 
    ///                 </param>
    public override object GetValue(object component)
    {
      JToken token = CastInstance(component)[Name];

      return token;
    }

    /// <summary>
    /// When overridden in a derived class, resets the value for this property of the component to the default value.
    /// </summary>
    /// <param name="component">The component with the property value that is to be reset to the default value. 
    ///                 </param>
    public override void ResetValue(object component)
    {
    }

    /// <summary>
    /// When overridden in a derived class, sets the value of the component to a different value.
    /// </summary>
    /// <param name="component">The component with the property value that is to be set. 
    ///                 </param><param name="value">The new value. 
    ///                 </param>
    public override void SetValue(object component, object value)
    {
      JToken token = (value is JToken) ? (JToken) value : new JValue(value);

      CastInstance(component)[Name] = token;
    }

    /// <summary>
    /// When overridden in a derived class, determines a value indicating whether the value of this property needs to be persisted.
    /// </summary>
    /// <returns>
    /// true if the property should be persisted; otherwise, false.
    /// </returns>
    /// <param name="component">The component with the property to be examined for persistence. 
    ///                 </param>
    public override bool ShouldSerializeValue(object component)
    {
      return false;
    }

    /// <summary>
    /// When overridden in a derived class, gets the type of the component this property is bound to.
    /// </summary>
    /// <returns>
    /// A <see cref="T:System.Type"/> that represents the type of component this property is bound to. When the <see cref="M:System.ComponentModel.PropertyDescriptor.GetValue(System.Object)"/> or <see cref="M:System.ComponentModel.PropertyDescriptor.SetValue(System.Object,System.Object)"/> methods are invoked, the object specified might be an instance of this type.
    /// </returns>
    public override Type ComponentType
    {
      get { return typeof(JObject); }
    }

    /// <summary>
    /// When overridden in a derived class, gets a value indicating whether this property is read-only.
    /// </summary>
    /// <returns>
    /// true if the property is read-only; otherwise, false.
    /// </returns>
    public override bool IsReadOnly
    {
      get { return false; }
    }

    /// <summary>
    /// When overridden in a derived class, gets the type of the property.
    /// </summary>
    /// <returns>
    /// A <see cref="T:System.Type"/> that represents the type of the property.
    /// </returns>
    public override Type PropertyType
    {
      get { return _propertyType; }
    }

    /// <summary>
    /// Gets the hash code for the name of the member.
    /// </summary>
    /// <value></value>
    /// <returns>
    /// The hash code for the name of the member.
    /// </returns>
    protected override int NameHashCode
    {
      get
      {
        // override property to fix up an error in its documentation
        int nameHashCode = base.NameHashCode;
        return nameHashCode;
      }
    }
  }
}
#endif