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Util.cs

//
// Util.cs
//
// Author:
//   Lluis Sanchez Gual
//
// Copyright (C) 2007 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.Collections;
using System.IO;
using System.Reflection;
using Mono.Addins.Description;
using Mono.Addins.Serialization;

namespace Mono.Addins.Database
{
      internal class Util
      {
            public static bool IsWindows {
                  get { return Path.DirectorySeparatorChar == '\\'; }
            }
                  
            public static void CheckWrittableFloder (string path)
            {
                  string testFile = null;
                  int n = 0;
                  do {
                        testFile = Path.Combine (path, new Random ().Next ().ToString ());
                        n++;
                  } while (File.Exists (testFile) && n < 100);
                  if (n == 100)
                        throw new InvalidOperationException ("Could not create file in directory: " + path);
                  
                  StreamWriter w = new StreamWriter (testFile);
                  w.Close ();
                  File.Delete (testFile);
            }
            
            public static void AddDependencies (AddinDescription desc, AddinScanResult scanResult)
            {
                  // Not implemented in AddinScanResult to avoid making AddinDescription remotable
                  foreach (ModuleDescription mod in desc.AllModules) {
                        foreach (Dependency dep in mod.Dependencies) {
                              AddinDependency adep = dep as AddinDependency;
                              if (adep == null) continue;
                              string depid = Addin.GetFullId (desc.Namespace, adep.AddinId, adep.Version);
                              scanResult.AddAddinToUpdateRelations (depid);
                        }
                  }
            }
            
            public static Assembly LoadAssemblyForReflection (string fileName)
            {
/*                if (!gotLoadMethod) {
                        reflectionOnlyLoadFrom = typeof(Assembly).GetMethod ("ReflectionOnlyLoadFrom");
                        gotLoadMethod = true;
                        LoadAssemblyForReflection (typeof(Util).Assembly.Location);
                  }
                  
                  if (reflectionOnlyLoadFrom != null)
                        return (Assembly) reflectionOnlyLoadFrom.Invoke (null, new string [] { fileName });
                  else
*/                      return Assembly.LoadFile (fileName);
            }
            
            // Works like Path.GetFullPath, but it does not require the path to exist
            public static string GetFullPath (string path)
            {
                  if (path == null)
                        throw new ArgumentNullException ("path");
                        
                  if (!Path.IsPathRooted (path))
                        path = Path.Combine (Environment.CurrentDirectory, path);
                  
                  string root = Path.GetPathRoot (path);
                  path = path.Substring (root.Length);
                  
                  string[] parts = path.Split (Path.DirectorySeparatorChar);
                  string[] newParts = new string [parts.Length];
                  int i = 0;
                  for (int n=0; n<parts.Length; n++) {
                        string p = parts [n];
                        if (p == null || p.Length == 0 || p == ".")
                              continue;
                        if (p == "..") {
                              if (i > 0)
                                    i--;
                        } else {
                              newParts [i++] = p;
                        }
                  }
                  return root + string.Join (new string (Path.DirectorySeparatorChar, 1), newParts, 0, i);
            }
            
            public static int GetStringHashCode (string s)
            {
                  int h = 0;
                  int n = 0;
                  for (; n < s.Length - 1; n+=2) {
                        h = (h << 5) - h + s[n];
                        h = (h << 5) - h + s[n+1];
                  }
                  if (n < s.Length)
                        h = (h << 5) - h + s[n];
                  return h;
            }
            
            public static string GetGacPath (string fullName)
            {
                  string gacDir = typeof(Uri).Assembly.Location;
                  gacDir = Path.GetDirectoryName (gacDir);
                  gacDir = Path.GetDirectoryName (gacDir);
                  gacDir = Path.GetDirectoryName (gacDir);
                  
                  string[] parts = fullName.Split (',');
                  if (parts.Length != 4) return null;
                  string name = parts[0].Trim ();
                  
                  int i = parts[1].IndexOf ('=');
                  string version = i != -1 ? parts[1].Substring (i+1).Trim () : parts[1].Trim ();
                  
                  i = parts[2].IndexOf ('=');
                  string culture = i != -1 ? parts[2].Substring (i+1).Trim () : parts[2].Trim ();
                  if (culture == "neutral") culture = "";
                  
                  i = parts[3].IndexOf ('=');
                  string token = i != -1 ? parts[3].Substring (i+1).Trim () : parts[3].Trim ();
                  
                  string file = Path.Combine (gacDir, name);
                  file = Path.Combine (file, version + "_" + culture + "_" + token);
                  return file;
            }
      }
}

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