//---------------------------------------------------------------------
// <copyright file="ModelPerspective.cs" company="Microsoft">
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
//
// @owner       Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
 
namespace System.Data.Metadata.Edm
{
    using System.Collections.Generic;
    using System.Globalization;
 
    /// <summary>
    /// Internal helper class for query
    /// </summary>
    internal class ModelPerspective : Perspective
    {
        #region Contructors
        /// <summary>
        /// Creates a new instance of perspective class so that query can work
        /// ignorant of all spaces
        /// </summary>
        /// <param name="metadataWorkspace">runtime metadata container</param>
        internal ModelPerspective(MetadataWorkspace metadataWorkspace)
            : base(metadataWorkspace, DataSpace.CSpace)
        {
        }
        #endregion
 
        #region Methods
        /// <summary>
        /// Look up a type in the target data space based upon the fullName
        /// </summary>
        /// <param name="fullName">fullName</param>
        /// <param name="ignoreCase">true for case-insensitive lookup</param>
        /// <param name="typeUsage">The type usage object to return</param>
        /// <returns>True if the retrieval succeeded</returns>
        internal override bool TryGetTypeByName(string fullName, bool ignoreCase, out TypeUsage typeUsage )
        {
            EntityUtil.CheckStringArgument(fullName, "fullName");
            typeUsage = null;
            EdmType edmType = null;
            if (this.MetadataWorkspace.TryGetItem<EdmType>(fullName, ignoreCase, this.TargetDataspace, out edmType))
            {
                if (Helper.IsPrimitiveType(edmType))
                {
                    typeUsage = this.MetadataWorkspace.GetCanonicalModelTypeUsage(((PrimitiveType)edmType).PrimitiveTypeKind);
                }
                else
                {
                    typeUsage = TypeUsage.Create(edmType);
                }
            }
            return typeUsage != null;
        }
        #endregion
    }
}