/* ****************************************************************************

 *

 * Copyright (c) Microsoft Corporation. 

 *

 * This source code is subject to terms and conditions of the Apache License, Version 2.0. A 

 * copy of the license can be found in the License.html file at the root of this distribution. If 

 * you cannot locate the Apache License, Version 2.0, please send an email to 

 * ironpy@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 

 * by the terms of the Apache License, Version 2.0.

 *

 * You must not remove this notice, or any other, from this software.

 *

 * ***************************************************************************/



using Microsoft.VisualStudio.Shell.Interop;



namespace Microsoft.IronStudio.Navigation {

    /// <summary>

    /// Class used to identify a module. The module is identified using the hierarchy that

    /// contains it and its item id inside the hierarchy.

    /// </summary>

    public sealed class ModuleId {

        private IVsHierarchy _ownerHierarchy;

        private uint _itemId;



        public ModuleId(IVsHierarchy owner, uint id) {

            _ownerHierarchy = owner;

            _itemId = id;

        }



        public IVsHierarchy Hierarchy {

            get { return _ownerHierarchy; }

        }



        public uint ItemID {

            get { return _itemId; }

        }



        public override int GetHashCode() {

            int hash = 0;

            if (null != _ownerHierarchy) {

                hash = _ownerHierarchy.GetHashCode();

            }

            hash = hash ^ (int)_itemId;

            return hash;

        }



        public override bool Equals(object obj) {

            ModuleId other = obj as ModuleId;

            if (null == obj) {

                return false;

            }

            if (!_ownerHierarchy.Equals(other._ownerHierarchy)) {

                return false;

            }

            return (_itemId == other._itemId);

        }

    }

}