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//
// AddinFileSystemExtension.cs
//
// Author:
// Lluis Sanchez Gual <lluis@novell.com>
//
// Copyright (c) 2011 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.IO;
using System.Reflection;
namespace Mono.Addins.Database
{
/// <summary>
/// An add-in file system extension.
/// </summary>
/// <remarks>
/// File system extensions can override the behavior of the add-in scanner and provide custom rules for
/// locating and scanning assemblies.
/// </remarks>
[Serializable]
public class AddinFileSystemExtension
{
IAssemblyReflector reflector;
/// <summary>
/// Called when the add-in scan is about to start
/// </summary>
public virtual void ScanStarted ()
{
}
/// <summary>
/// Called when the add-in scan has finished
/// </summary>
public virtual void ScanFinished ()
{
}
/// <summary>
/// Checks if a directory exists
/// </summary>
/// <returns>
/// 'true' if the directory exists
/// </returns>
/// <param name='path'>
/// Directory path
/// </param>
public virtual bool DirectoryExists (string path)
{
return Directory.Exists (path);
}
/// <summary>
/// Checks if a file exists
/// </summary>
/// <returns>
/// 'true' if the file exists
/// </returns>
/// <param name='path'>
/// Path to the file
/// </param>
public virtual bool FileExists (string path)
{
return File.Exists (path);
}
/// <summary>
/// Gets the files in a directory
/// </summary>
/// <returns>
/// The full path of the files in the directory
/// </returns>
/// <param name='path'>
/// Directory path
/// </param>
public virtual System.Collections.Generic.IEnumerable<string> GetFiles (string path)
{
return Directory.GetFiles (path);
}
/// <summary>
/// Gets the subdirectories of a directory
/// </summary>
/// <returns>
/// The subdirectories.
/// </returns>
/// <param name='path'>
/// The directory
/// </param>
public virtual System.Collections.Generic.IEnumerable<string> GetDirectories (string path)
{
return Directory.GetDirectories (path);
}
/// <summary>
/// Gets the last write time of a file
/// </summary>
/// <returns>
/// The last write time.
/// </returns>
/// <param name='filePath'>
/// File path.
/// </param>
public virtual DateTime GetLastWriteTime (string filePath)
{
return File.GetLastWriteTime (filePath);
}
/// <summary>
/// Opens a text file
/// </summary>
/// <returns>
/// The text file stream
/// </returns>
/// <param name='path'>
/// File path.
/// </param>
public virtual System.IO.StreamReader OpenTextFile (string path)
{
return new StreamReader (path);
}
/// <summary>
/// Opens a file.
/// </summary>
/// <returns>
/// The file stream.
/// </returns>
/// <param name='path'>
/// The file path.
/// </param>
public virtual System.IO.Stream OpenFile (string path)
{
return File.OpenRead (path);
}
/// <summary>
/// Gets an assembly reflector for a file.
/// </summary>
/// <returns>
/// The reflector for the file.
/// </returns>
/// <param name='locator'>
/// An assembly locator
/// </param>
/// <param name='path'>
/// A file path
/// </param>
public virtual IAssemblyReflector GetReflectorForFile (IAssemblyLocator locator, string path)
{
if (reflector != null)
return reflector;
// If there is a local copy of the cecil reflector, use it instead of the one in the gac
Type t;
string asmFile = Path.Combine (Path.GetDirectoryName (GetType().Assembly.Location), "Mono.Addins.CecilReflector.dll");
if (File.Exists (asmFile)) {
Assembly asm = Assembly.LoadFrom (asmFile);
t = asm.GetType ("Mono.Addins.CecilReflector.Reflector");
}
else {
string refName = GetType().Assembly.FullName;
int i = refName.IndexOf (',');
refName = "Mono.Addins.CecilReflector.Reflector, Mono.Addins.CecilReflector" + refName.Substring (i);
t = Type.GetType (refName, false);
}
if (t != null)
reflector = (IAssemblyReflector) Activator.CreateInstance (t);
else
reflector = new DefaultAssemblyReflector ();
reflector.Initialize (locator);
return reflector;
}
public virtual void DeleteFile (string filePath)
{
File.Delete (filePath);
}
internal void CleanupReflector()
{
var disposable = reflector as IDisposable;
if (disposable != null)
disposable.Dispose ();
}
/// <summary>
/// Gets a value indicating whether this <see cref="Mono.Addins.Database.AddinFileSystemExtension"/> needs to be isolated from the main execution process
/// </summary>
/// <value>
/// <c>true</c> if requires isolation; otherwise, <c>false</c>.
/// </value>
public virtual bool RequiresIsolation {
get { return true; }
}
}
}
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