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250 lines
11 KiB
250 lines
11 KiB
/* Copyright (C) 2008-2016 Peter Palotas, Jeffrey Jangli, Alexandr Normuradov
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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using System;
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using System.Diagnostics.CodeAnalysis;
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using System.Globalization;
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using System.IO;
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using System.Security;
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namespace Alphaleonis.Win32.Filesystem
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{
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/// <summary>Provides properties and instance methods for the creation, copying, deletion, moving, and opening of files, and aids in the creation of <see cref="FileStream"/> objects. This class cannot be inherited.</summary>
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[SerializableAttribute]
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public sealed partial class FileInfo : FileSystemInfo
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{
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#region Constructors
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#region .NET
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/// <summary>Initializes a new instance of the <see cref="Alphaleonis.Win32.Filesystem.FileInfo"/> class, which acts as a wrapper for a file path.</summary>
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/// <param name="fileName">The fully qualified name of the new file, or the relative file name. Do not end the path with the directory separator character.</param>
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/// <remarks>This constructor does not check if a file exists. This constructor is a placeholder for a string that is used to access the file in subsequent operations.</remarks>
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public FileInfo(string fileName) : this(null, fileName, PathFormat.RelativePath)
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{
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}
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#endregion // .NET
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#region AlphaFS
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#region Non-Transactional
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/// <summary>[AlphaFS] Initializes a new instance of the <see cref="Alphaleonis.Win32.Filesystem.FileInfo"/> class, which acts as a wrapper for a file path.</summary>
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/// <param name="fileName">The fully qualified name of the new file, or the relative file name. Do not end the path with the directory separator character.</param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <remarks>This constructor does not check if a file exists. This constructor is a placeholder for a string that is used to access the file in subsequent operations.</remarks>
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public FileInfo(string fileName, PathFormat pathFormat) : this(null, fileName, pathFormat)
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{
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}
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#endregion // Non-Transactional
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#region Transactional
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/// <summary>[AlphaFS] Initializes a new instance of the <see cref="Alphaleonis.Win32.Filesystem.FileInfo"/> class, which acts as a wrapper for a file path.</summary>
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/// <param name="transaction">The transaction.</param>
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/// <param name="fileName">The fully qualified name of the new file, or the relative file name. Do not end the path with the directory separator character.</param>
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/// <remarks>This constructor does not check if a file exists. This constructor is a placeholder for a string that is used to access the file in subsequent operations.</remarks>
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public FileInfo(KernelTransaction transaction, string fileName) : this(transaction, fileName, PathFormat.RelativePath)
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{
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}
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/// <summary>[AlphaFS] Initializes a new instance of the <see cref="Alphaleonis.Win32.Filesystem.FileInfo"/> class, which acts as a wrapper for a file path.</summary>
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/// <param name="transaction">The transaction.</param>
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/// <param name="fileName">The fully qualified name of the new file, or the relative file name. Do not end the path with the directory separator character.</param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <remarks>This constructor does not check if a file exists. This constructor is a placeholder for a string that is used to access the file in subsequent operations.</remarks>
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public FileInfo(KernelTransaction transaction, string fileName, PathFormat pathFormat)
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{
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InitializeCore(false, transaction, fileName, pathFormat);
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_name = Path.GetFileName(Path.RemoveTrailingDirectorySeparator(fileName, false), pathFormat != PathFormat.LongFullPath);
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}
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#endregion // Transacted
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#endregion // AlphaFS
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#endregion // Constructors
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#region Properties
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#region .NET
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#region Directory
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/// <summary>Gets an instance of the parent directory.</summary>
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/// <value>A <see cref="DirectoryInfo"/> object representing the parent directory of this file.</value>
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/// <remarks>To get the parent directory as a string, use the DirectoryName property.</remarks>
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/// <exception cref="DirectoryNotFoundException"/>
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public DirectoryInfo Directory
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{
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get
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{
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string dirName = DirectoryName;
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return dirName == null ? null : new DirectoryInfo(Transaction, dirName, PathFormat.FullPath);
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}
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}
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#endregion // Directory
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#region DirectoryName
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/// <summary>Gets a string representing the directory's full path.</summary>
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/// <value>A string representing the directory's full path.</value>
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/// <remarks>
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/// <para>To get the parent directory as a DirectoryInfo object, use the Directory property.</para>
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/// <para>When first called, FileInfo calls Refresh and caches information about the file.</para>
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/// <para>On subsequent calls, you must call Refresh to get the latest copy of the information.</para>
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/// </remarks>
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/// <exception cref="ArgumentNullException"/>
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public string DirectoryName
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{
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[SecurityCritical] get { return Path.GetDirectoryName(FullPath, false); }
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}
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#endregion // DirectoryName
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#region Exists
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/// <summary>Gets a value indicating whether the file exists.</summary>
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/// <value><see langword="true"/> if the file exists; otherwise, <see langword="false"/>.</value>
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/// <remarks>
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/// <para>The <see cref="Exists"/> property returns <see langword="false"/> if any error occurs while trying to determine if the specified file exists.</para>
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/// <para>This can occur in situations that raise exceptions such as passing a file name with invalid characters or too many characters,</para>
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/// <para>a failing or missing disk, or if the caller does not have permission to read the file.</para>
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/// </remarks>
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[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")]
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public override bool Exists
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{
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[SecurityCritical]
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get
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{
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try
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{
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if (DataInitialised == -1)
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Refresh();
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FileAttributes attrs = Win32AttributeData.dwFileAttributes;
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return DataInitialised == 0 && attrs != (FileAttributes) (-1) && (attrs & FileAttributes.Directory) == 0;
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}
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catch
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{
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return false;
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}
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}
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}
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#endregion // Exists
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#region IsReadOnly
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/// <summary>Gets or sets a value that determines if the current file is read only.</summary>
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/// <value><see langword="true"/> if the current file is read only; otherwise, <see langword="false"/>.</value>
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/// <remarks>
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/// <para>Use the IsReadOnly property to quickly determine or change whether the current file is read only.</para>
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/// <para>When first called, FileInfo calls Refresh and caches information about the file.</para>
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/// <para>On subsequent calls, you must call Refresh to get the latest copy of the information.</para>
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/// </remarks>
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/// <exception cref="FileNotFoundException"/>
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/// <exception cref="IOException"/>
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public bool IsReadOnly
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{
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get { return EntryInfo == null || EntryInfo.IsReadOnly; }
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set
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{
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if (value)
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Attributes |= FileAttributes.ReadOnly;
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else
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Attributes &= ~FileAttributes.ReadOnly;
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}
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}
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#endregion // IsReadOnly
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#region Length
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/// <summary>Gets the size, in bytes, of the current file.</summary>
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/// <value>The size of the current file in bytes.</value>
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/// <remarks>
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/// <para>The value of the Length property is pre-cached</para>
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/// <para>To get the latest value, call the Refresh method.</para>
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/// </remarks>
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/// <exception cref="FileNotFoundException"/>
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/// <exception cref="IOException"/>
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[SuppressMessage("Microsoft.Design", "CA1065:DoNotRaiseExceptionsInUnexpectedLocations")]
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public long Length
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{
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[SecurityCritical]
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get
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{
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if (DataInitialised == -1)
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{
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Win32AttributeData = new NativeMethods.WIN32_FILE_ATTRIBUTE_DATA();
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Refresh();
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}
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// MSDN: .NET 3.5+: IOException: Refresh cannot initialize the data.
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if (DataInitialised != 0)
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NativeError.ThrowException(DataInitialised, LongFullName);
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FileAttributes attrs = Win32AttributeData.dwFileAttributes;
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// MSDN: .NET 3.5+: FileNotFoundException: The file does not exist or the Length property is called for a directory.
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if (attrs == (FileAttributes) (-1))
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NativeError.ThrowException(Win32Errors.ERROR_FILE_NOT_FOUND, LongFullName);
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// MSDN: .NET 3.5+: FileNotFoundException: The file does not exist or the Length property is called for a directory.
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if ((attrs & FileAttributes.Directory) == FileAttributes.Directory)
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NativeError.ThrowException(Win32Errors.ERROR_FILE_NOT_FOUND, string.Format(CultureInfo.CurrentCulture, Resources.Target_File_Is_A_Directory, LongFullName));
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return Win32AttributeData.FileSize;
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}
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}
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#endregion // Length
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#region Name
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private string _name;
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/// <summary>Gets the name of the file.</summary>
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/// <value>The name of the file.</value>
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/// <remarks>
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/// <para>The name of the file includes the file extension.</para>
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/// <para>When first called, <see cref="FileInfo"/> calls Refresh and caches information about the file.</para>
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/// <para>On subsequent calls, you must call Refresh to get the latest copy of the information.</para>
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/// <para>The name of the file includes the file extension.</para>
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/// </remarks>
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public override string Name
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{
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get { return _name; }
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}
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#endregion // Name
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#endregion // .NET
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#endregion // Properties
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}
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}
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