File: ProjectionPath.cs

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//Copyright 2010 Microsoft Corporation
//
//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.


namespace System.Data.Services.Client
{
    #region Namespaces.

    using System.Collections.Generic;
    using System.Diagnostics;
    using System.Linq.Expressions;
    using System.Text;

    #endregion Namespaces.

    [DebuggerDisplay("{ToString()}")]
    internal class ProjectionPath : List<ProjectionPathSegment>
    {
        #region Constructors.

        internal ProjectionPath() : base()
        {
        }

        internal ProjectionPath(ParameterExpression root, Expression expectedRootType, Expression rootEntry)
            : base()
        {
            this.Root = root;
            this.RootEntry = rootEntry;
            this.ExpectedRootType = expectedRootType;
        }

        internal ProjectionPath(ParameterExpression root, Expression expectedRootType, Expression rootEntry, IEnumerable<Expression> members)
            : this(root, expectedRootType, rootEntry)
        {
            Debug.Assert(members != null, "members != null");

            foreach (Expression member in members)
            {
                this.Add(new ProjectionPathSegment(this, ((MemberExpression)member).Member.Name, member.Type));
            }
        }

        #endregion Constructors.

        #region Internal properties.

        internal ParameterExpression Root 
        { 
            get; 
            private set; 
        }

        internal Expression RootEntry 
        { 
            get; 
            private set; 
        }

        internal Expression ExpectedRootType 
        { 
            get; 
            private set; 
        }

        #endregion Internal properties.

        #region Methods.

        public override string ToString()
        {
            StringBuilder builder = new StringBuilder();
            builder.Append(this.Root.ToString());
            builder.Append("->");
            for (int i = 0; i < this.Count; i++)
            {
                if (i > 0)
                {
                    builder.Append('.');
                }

                builder.Append(this[i].Member == null ? "*" : this[i].Member);
            }

            return builder.ToString();
        }

        #endregion Methods.
    }
}