/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

* 

* Description:

*

*/

using System;

using System.Collections.Generic;

using System.Text;

using System.IO;

namespace SymbianUtils.FileSystem

{

    public abstract class FSEntity

    {

        #region Static constructors

        public static FSEntity New( string aFSEntityName )

        {

            FSEntity ret = null;

            //

            try

            {

                try

                {

                    DirectoryInfo dir = new DirectoryInfo( aFSEntityName );

                    if ( dir.Exists )

                    {

                        ret = new FSEntityDirectory( dir );

                    }

                    else

                    {

                        ret = new FSEntityFile( new FileInfo( aFSEntityName ) );

                    }

                }

                catch ( Exception )

                {

                    ret = new FSEntityFile( new FileInfo( aFSEntityName ) );

                }

            }

            catch ( Exception )

            {

            }

            //

            if ( ret == null )

            {

                throw new FileNotFoundException( "Could not locate suitable entity", aFSEntityName );

            }

            //

            return ret;

        }

        public static FSEntity New( FSEntity aClone )

        {

            FSEntity ret = null;

            //

            if ( aClone is FSEntityFile )

            {

                ret = new FSEntityFile( ( (FSEntityFile) aClone ).File );

            }

            else if ( aClone is FSEntityDirectory )

            {

                ret = new FSEntityDirectory( ( (FSEntityDirectory) aClone ).Directory );

            }

            else

            {

                throw new ArgumentException( "Unsupported File System Entity Type" );

            }

            //

            return ret;

        }

        #endregion

        #region Constructors

        protected FSEntity()

        {

        }

        #endregion

        #region API

        #endregion

        #region Properties

        public bool IsFile

        {

            get { return this is FSEntityFile; }

        }

        public bool IsDirectory

        {

            get { return this is FSEntityDirectory; }

        }

        public abstract string FullName

        {

            get;

        }

        public abstract bool IsValid

        {

            get;

        }

        public abstract bool Exists

        {

            get;

        }

        #endregion

        #region Internal API

        #endregion

        #region Internal methods

        #endregion

        #region Operators

        public static bool operator ==( FSEntity aLeft, FSEntity aRight )

        {

            // If both are null, or both are same instance, return true.

            if ( System.Object.ReferenceEquals( aLeft, aRight ) )

            {

                return true;

            }

            // If one is null, but not both, return false.

            if ( ( (object) aLeft == null ) || ( (object) aRight == null ) )

            {

                return false;

            }

            // Return true if the fields match:

            return aLeft.Equals( aRight );

        }

        public static bool operator !=( FSEntity aLeft, FSEntity aRight )

        {

            return !( aLeft == aRight );

        }

        #endregion

        #region From System.Object

        public override int GetHashCode()

        {

            return FullName.GetHashCode();

        }

        public override bool Equals( object aObject )

        {

            if ( aObject != null )

            {

                if ( aObject is FSEntity )

                {

                    FSEntity other = (FSEntity) aObject;

                    //

                    if ( other.IsFile && this.IsFile )

                    {

                        return other.FullName.Equals( this.FullName );

                    }

                    else if ( other.IsDirectory && this.IsDirectory )

                    {

                        return other.FullName.Equals( this.FullName );

                    }

                }

            }

            //

            return base.Equals( aObject );

        }

        public override string ToString()

        {

            return FullName;

        }

        #endregion

        #region Data members

        #endregion

    }

}