IgnoreFlushAndCloseStream.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / MS / Internal / IO / Packaging / IgnoreFlushAndCloseStream.cs / 1 / IgnoreFlushAndCloseStream.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation, 2005
//
//  File:           IgnoreCloseAndFlushStream.cs 
//
//  Description:    The class is used to wrap a given stream in a way that the Flush 
//                  and Close calls to the stream are Ignored. This stream class has been 
//                  created specifically for perf improvements for the ZipPackage.
// 
//
//  History:        09/05/05 - [....] - initial implementation
//-----------------------------------------------------------------------------
 
using System;
using System.IO; 
using System.Windows;                       // for ExceptionStringTable 

namespace MS.Internal.IO.Packaging 
{
    /// 
    /// This class ignores all calls to Flush() and Close() methods
    /// depending on whether the IgnoreFlushAndClose property is set to true 
    /// or false.
    ///  
    internal sealed class IgnoreFlushAndCloseStream : Stream 
    {
        #region Constructor 

        /// 
        /// Constructor
        ///  
        /// 
        internal IgnoreFlushAndCloseStream(Stream stream) 
        { 
            if (stream == null)
                throw new ArgumentNullException("stream"); 

            _stream = stream;
        }
 
        #endregion Constructor
 
        #region Properties 

        ///  
        /// Member of the abstract Stream class
        /// 
        /// Bool, true if the stream can be read from, else false
        public override bool CanRead 
        {
            get 
            { 
                if (_disposed)
                    return false; 
                else
                    return _stream.CanRead;
            }
        } 

        ///  
        /// Member of the abstract Stream class 
        /// 
        /// Bool, true if the stream can be seeked, else false 
        public override bool CanSeek
        {
            get
            { 
                if (_disposed)
                    return false; 
                else 
                    return _stream.CanSeek;
            } 
        }

        /// 
        /// Member of the abstract Stream class 
        /// 
        /// Bool, true if the stream can be written to, else false 
        public override bool CanWrite 
        {
            get 
            {
                if (_disposed)
                    return false;
                else 
                    return _stream.CanWrite;
            } 
        } 

        ///  
        /// Member of the abstract Stream class
        /// 
        /// Long value indicating the length of the stream
        public override long Length 
        {
            get 
            { 
                ThrowIfStreamDisposed();
                return _stream.Length; 
            }
        }

        ///  
        /// Member of the abstract Stream class
        ///  
        /// Long value indicating the current position in the stream 
        public override long Position
        { 
            get
            {
                ThrowIfStreamDisposed();
                return _stream.Position; 
            }
            set 
            { 
                ThrowIfStreamDisposed();
                _stream.Position = value; 
            }
        }

        #endregion Properties 

        #region Methods 
 
        /// 
        /// Member of the abstract Stream class 
        /// 
        /// only zero is supported
        /// only SeekOrigin.Begin is supported
        /// zero 
        public override long Seek(long offset, SeekOrigin origin)
        { 
            ThrowIfStreamDisposed(); 
            return _stream.Seek(offset, origin);
        } 

        /// 
        /// Member of the abstract Stream class
        ///  
        /// 
        public override void SetLength(long newLength) 
        { 
            ThrowIfStreamDisposed();
            _stream.SetLength(newLength); 
        }

        /// 
        /// Member of the abstract Stream class 
        /// 
        ///  
        ///  
        /// 
        ///  
        /// 
        /// The standard Stream.Read semantics, and in particular the restoration of the current
        /// position in case of an exception, is implemented by the underlying stream.
        ///  
        public override int Read(byte[] buffer, int offset, int count)
        { 
            ThrowIfStreamDisposed(); 
            return _stream.Read(buffer, offset, count);
        } 

        /// 
        /// Member of the abstract Stream class
        ///  
        /// 
        ///  
        ///  
        public override void Write(byte[] buf, int offset, int count)
        { 
            ThrowIfStreamDisposed();
            _stream.Write(buf, offset, count);
        }
 
        /// 
        /// Member of the abstract Stream class 
        ///  
        public override void Flush()
        { 
            ThrowIfStreamDisposed();
        }
        #endregion Methods
 
        //-----------------------------------------------------
        // 
        //  Protected Methods 
        //
        //----------------------------------------------------- 
        /// 
        /// Dispose(bool)
        /// 
        ///  
        protected override void Dispose(bool disposing)
        { 
            try 
            {
                if (!_disposed) 
                {
                    _stream = null;
                    _disposed = true;
                } 
            }
            finally 
            { 
                base.Dispose(disposing);
            } 
        }


        #region Private Methods 

        private void ThrowIfStreamDisposed() 
        { 
            if (_disposed)
                throw new ObjectDisposedException(null, SR.Get(SRID.StreamObjectDisposed)); 
        }

        #endregion Private Methods
 
        #region Private Variables
 
        private Stream _stream; 
        private bool _disposed;
 
        #endregion Private Variables

    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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IgnoreFlushAndCloseStream.cs source code in C# .NET

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