ConfigurationProperty.cs :  » 2.6.4-mono-.net-core » System.Configuration » System » Configuration » C# / CSharp Open Source

//
// System.Configuration.ConfigurationProperty.cs
//
// Authors:
//  Duncan Mak (duncan@ximian.com)
//  Lluis Sanchez Gual (lluis@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.
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//

#if NET_2_0
using System;
using System.ComponentModel;

namespace System.Configuration{
  public sealed class ConfigurationProperty
  {
    internal static readonly object NoDefaultValue = new object ();
    
    string name;
    Type type;
    object default_value;
    TypeConverter converter;
    ConfigurationValidatorBase validation;
    ConfigurationPropertyOptions flags;
    string description;
    ConfigurationCollectionAttribute collectionAttribute;
    
    public ConfigurationProperty (string name, Type type)
      : this (name, type, NoDefaultValue, TypeDescriptor.GetConverter (type), new DefaultValidator(), ConfigurationPropertyOptions.None, null)
    { }

    public ConfigurationProperty (string name, Type type, object default_value)
      : this (name, type, default_value, TypeDescriptor.GetConverter (type), new DefaultValidator(), ConfigurationPropertyOptions.None, null)
    { }

    public ConfigurationProperty (
          string name, Type type, object default_value,
          ConfigurationPropertyOptions flags)
      :this (name, type, default_value, TypeDescriptor.GetConverter (type), new DefaultValidator(), flags, null)
    { }
    
    public ConfigurationProperty (
          string name, Type type, object default_value,
          TypeConverter converter,
          ConfigurationValidatorBase validation,
          ConfigurationPropertyOptions flags)
      : this (name, type, default_value, converter, validation, flags, null)
    { }

    public ConfigurationProperty (
          string name, Type type, object default_value,
          TypeConverter converter,
          ConfigurationValidatorBase validation,
          ConfigurationPropertyOptions flags,
          string description)
    {
      this.name = name;
      this.converter = converter != null ? converter : TypeDescriptor.GetConverter (type);
      if (default_value != null) {
        if (default_value == NoDefaultValue) {
          switch (Type.GetTypeCode (type)) {
          case TypeCode.Object:
            default_value = null;
            break;
          case TypeCode.String:
            default_value = String.Empty;
            break;
          default:
            default_value = Activator.CreateInstance (type);
            break;
          }
        }
        else
          if (!type.IsAssignableFrom (default_value.GetType ())) {
            if (!this.converter.CanConvertFrom (default_value.GetType ()))
              throw new ConfigurationErrorsException (String.Format ("The default value for property '{0}' has a different type than the one of the property itself: expected {1} but was {2}",
                             name, type, default_value.GetType ()));

            default_value = this.converter.ConvertFrom (default_value);
          }
      }
      this.default_value = default_value;
      this.flags = flags;
      this.type = type;
      this.validation = validation != null ? validation : new DefaultValidator ();
      this.description = description;
    }

    public TypeConverter Converter {
      get { return converter; }
    }

    public object DefaultValue {                        
      get { return default_value; }
    }

    public bool IsKey {                        
      get { return (flags & ConfigurationPropertyOptions.IsKey) != 0; }
    }

    public bool IsRequired {
      get { return (flags & ConfigurationPropertyOptions.IsRequired) != 0; }
    }

    public bool IsDefaultCollection {
      get { return (flags & ConfigurationPropertyOptions.IsDefaultCollection) != 0; }
    }

    public string Name {
      get { return name; }
    }

    public string Description {
      get { return description; }
    }

    public Type Type {
      get { return type; }
    }

    public ConfigurationValidatorBase Validator {
      get { return validation; }
    }

    internal object ConvertFromString (string value)
    {
      if (converter != null)
        return converter.ConvertFromInvariantString (value);
      else
        throw new NotImplementedException ();
    }

    internal string ConvertToString (object value)
    {
      if (converter != null)
        return converter.ConvertToInvariantString (value);
      else
        throw new NotImplementedException ();
    }
    
    internal bool IsElement {
      get {
        return (typeof(ConfigurationElement).IsAssignableFrom (type));
      }
    }
    
    internal ConfigurationCollectionAttribute CollectionAttribute {
      get { return collectionAttribute; }
      set { collectionAttribute = value; }
    }

    internal void Validate (object value)
    {
      if (validation != null)
        validation.Validate (value);
    }
  }
}
#endif