#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

using System;
using System.Collections;
using System.Runtime.Serialization;
using antlr.collections;

namespace Spring.Expressions
{
    /// <summary>
    /// Represents parsed map initializer node in the navigation expression.
    /// </summary>
    /// <author>Aleksandar Seovic</author>
    [Serializable]
    public class MapInitializerNode : BaseNode
    {
        /// <summary>
        /// Creates a new instance of <see cref="MapInitializerNode"/>.
        /// </summary>
        public MapInitializerNode()
        {}

         /// <summary>
        /// Create a new instance from SerializationInfo
        /// </summary>
        protected MapInitializerNode(SerializationInfo info, StreamingContext context)
            : base(info, context)
        {
        }
        
        /// <summary>
        /// Creates new instance of the map defined by this node.
        /// </summary>
        /// <param name="context">Context to evaluate expressions against.</param>
        /// <param name="evalContext">Current expression evaluation context.</param>
        /// <returns>Node's value.</returns>
        protected override object Get(object context, EvaluationContext evalContext)
        {
            IDictionary entries = new Hashtable();
            AST entryNode = this.getFirstChild();
            while (entryNode != null)
            {
                DictionaryEntry entry = (DictionaryEntry)
                                        ((MapEntryNode)entryNode).GetValueInternal( evalContext.RootContext, evalContext );
                entries[entry.Key] = entry.Value;
                entryNode = entryNode.getNextSibling();
            }

            return entries;
        }
    }
}
