ManagedDictionary.cs :  » Inversion-of-Control-Dependency-Injection » Spring.net » Spring » Objects » Factory » Config » C# / CSharp Open Source

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C# / CSharp Open Source » Inversion of Control Dependency Injection » Spring.net 
Spring.net » Spring » Objects » Factory » Config » ManagedDictionary.cs
#region License

/*
 * Copyright  2002-2005 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#endregion

#region Imports

using System;
using System.Collections;
#if NET_2_0
using System.Collections.Generic;
#endif
using System.Collections.Specialized;
using System.Globalization;

using Spring.Core;
using Spring.Core.TypeConversion;
using Spring.Core.TypeResolution;
using Spring.Objects.Factory.Config;
using Spring.Util;

#endregion

namespace Spring.Objects.Factory.Config{
  /// <summary>
  /// Tag subclass used to hold a dictionary of managed elements.
  /// </summary>
  /// <author>Juergen Hoeller</author>
  /// <author>Rick Evans (.NET)</author>
    [Serializable]
    public class ManagedDictionary : Hashtable, IManagedCollection, IMergable
  {
        private string keyTypeName;
        private string valueTypeName;
      private bool mergeEnabled;

      /// <summary>
      /// Initializes a new, empty instance of the <see cref="T:System.Collections.Hashtable"/> class using the default initial capacity, load factor, hash code provider, and comparer.
      /// </summary>
      public ManagedDictionary()
      {
      }

      /// <summary>
      /// Initializes a new, empty instance of the <see cref="T:System.Collections.Hashtable"/> class using the specified initial capacity, and the default load factor, hash code provider, and comparer.
      /// </summary>
      /// <param name="capacity">The approximate number of elements that the <see cref="T:System.Collections.Hashtable"/> object can initially contain. </param><exception cref="T:System.ArgumentOutOfRangeException"><paramref name="capacity"/> is less than zero. </exception>
      public ManagedDictionary(int capacity) : base(capacity)
      {
      }

      /// <summary>
        /// Gets or sets the unresolved name for the <see cref="System.Type"/> 
        /// of the keys of this managed dictionary.
        /// </summary>
        /// <value>The unresolved name for the type of the keys of this managed dictionary.</value>
        public string KeyTypeName
        {
            get { return this.keyTypeName; }
            set { this.keyTypeName = value; }
        }

        /// <summary>
        /// Gets or sets the unresolved name for the <see cref="System.Type"/> 
        /// of the values of this managed dictionary.
        /// </summary>
        /// <value>The unresolved name for the type of the values of this managed dictionary.</value>
        public string ValueTypeName
        {
            get { return this.valueTypeName; }
            set { this.valueTypeName = value; }
        }
      
    /// <summary>
    /// Resolves this managed collection at runtime.
    /// </summary>
    /// <param name="objectName">
    /// The name of the top level object that is having the value of one of it's
    /// collection properties resolved.
    /// </param>
    /// <param name="definition">
    /// The definition of the named top level object.
    /// </param>
    /// <param name="propertyName">
    /// The name of the property the value of which is being resolved.
    /// </param>
    /// <param name="resolver">
    /// The callback that will actually do the donkey work of resolving
    /// this managed collection.
    /// </param>
    /// <returns>A fully resolved collection.</returns>
    public ICollection Resolve(
      string objectName, IObjectDefinition definition,
      string propertyName, ManagedCollectionElementResolver resolver)
    {
            IDictionary dictionary;

            Type keyType = null;
            if (StringUtils.HasText(this.keyTypeName))
            {
                keyType = TypeResolutionUtils.ResolveType(this.keyTypeName);
            }

            Type valueType = null;
            if (StringUtils.HasText(this.valueTypeName))
            {
                valueType = TypeResolutionUtils.ResolveType(this.valueTypeName);
            }
#if NET_2_0
            if ((keyType == null) && (valueType == null))
            {
                dictionary = new HybridDictionary();
            }
            else
            {
                Type type = typeof(Dictionary<,>);
                Type[] genericArgs = new Type[2] { 
                    (keyType == null) ? typeof(object) : keyType,
                    (valueType == null) ? typeof(object) : valueType };
                type = type.MakeGenericType(genericArgs);

                dictionary = (IDictionary)ObjectUtils.InstantiateType(type);
            }
#else
            dictionary = new HybridDictionary();
#endif
            foreach (object key in this.Keys)
      {
        string elementName = string.Format(CultureInfo.InvariantCulture, "{0}[{1}]", propertyName, key);
        object resolvedKey = resolver(objectName, definition, elementName, key);
        object resolvedValue = resolver(objectName, definition, elementName, this[key]);

                if (keyType != null)
                {
                    try
                    {
                        resolvedKey = TypeConversionUtils.ConvertValueIfNecessary(keyType, resolvedKey, propertyName);
                    }
                    catch (TypeMismatchException)
                    {
                        throw new TypeMismatchException(
                            String.Format(
                                    "Unable to convert managed dictionary key '{0}' from [{1}] into [{2}] during initialization"
                                    + " of property '{3}' for object '{4}'. Do you have an appropriate type converter registered?", 
                                    resolvedKey, resolvedKey.GetType(), keyType, propertyName, objectName));
                    }
                }

                if (valueType != null)
                {
                    try
                    {
                        resolvedValue = TypeConversionUtils.ConvertValueIfNecessary(valueType, resolvedValue, propertyName + "[" + resolvedKey + "]");
                    }
                    catch (TypeMismatchException)
                    {
                        throw new TypeMismatchException(
                           String.Format(
                                   "Unable to convert managed dictionary value '{0}' from [{1}] into [{2}] during initialization"
                                   + " of property '{3}' for object '{4}'. Do you have an appropriate type converter registered?", 
                                   resolvedValue, resolvedValue.GetType(), valueType, propertyName, objectName));
                    }
                }

                dictionary.Add(resolvedKey, resolvedValue);
      }

            return dictionary;
    }

      /// <summary>
      /// Gets a value indicating whether this instance is merge enabled for this instance
      /// </summary>
      /// <value>
      ///   <c>true</c> if this instance is merge enabled; otherwise, <c>false</c>.
      /// </value>
      public bool MergeEnabled
      {
            get { return this.mergeEnabled; }
            set { this.mergeEnabled = value; }
      }

      /// <summary>
      /// Merges the current value set with that of the supplied object.
      /// </summary>
      /// <remarks>The supplied object is considered the parent, and values in the 
      /// callee's value set must override those of the supplied object.
      /// </remarks>
      /// <param name="parent">The parent object to merge with</param>
      /// <returns>The result of the merge operation</returns>
      /// <exception cref="ArgumentNullException">If the supplied parent is <code>null</code></exception>
      /// <exception cref="InvalidOperationException">If merging is not enabled for this instance,
      /// (i.e. <code>MergeEnabled</code> equals <code>false</code>.</exception>
      public object Merge(object parent)
      {
            if (!this.mergeEnabled)
            {
                throw new InvalidOperationException(
                    "Not allowed to merge when the 'MergeEnabled' property is set to 'false'");
            }
            if (parent == null)
            {
                return this;
            }
            IDictionary pDict = parent as IDictionary;
            if (pDict == null)
            {
                throw new InvalidOperationException("Cannot merge with object of type [" + parent.GetType() + "]");
            }
            IDictionary merged = new ManagedDictionary();
          foreach (DictionaryEntry dictionaryEntry in pDict)
          {
              merged[dictionaryEntry.Key] = dictionaryEntry.Value;
          }
          foreach (DictionaryEntry entry in this)
          {
              merged[entry.Key] = entry.Value;
          }
            return merged;
      }
  }
}
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