public void DetectModifications(string directoryPath)
{
FileMetadataCollection lastRun;
var lastRunFilePath = Path.Combine(directoryPath, LastRunDataFileName);
var exists = File.Exists(LastRunDataFileName);
if (exists)
{
var fileText = File.ReadAllText(lastRunFilePath);
lastRun = JsonConvert.DeserializeObject <FileMetadataCollection>(fileText);
}
else
{
lastRun = new FileMetadataCollection();
}
var filelist = Directory.EnumerateFiles(directoryPath)
.Where(f => !f.EndsWith(LastRunDataFileName))
.ToList();
var delta = _fileListDiffService.Compare(filelist, lastRun.Files);
var updated = _fileListDiffService.Apply(delta, lastRun.Files);
var updatedJson = JsonConvert.SerializeObject(updated);
File.WriteAllText(lastRunFilePath, updatedJson);
}
public void ModifiedFilesAreIdentified()
{
// Arrange
const string file1 = "File1";
const string file1Hash = "File1Hash";
const string file2 = "File2";
const string file2ModifiedHash = "File2ModifiedHash";
var filesInDirectory = new[] { file1, file2 };
var hashService = Mock.Of <IFileHashService>(s =>
s.ComputeHash(file1) == file1Hash &&
s.ComputeHash(file2) == file2ModifiedHash);
var lastRun = new FileMetadataCollection
{
Files = new List <FileMetadata>
{
new FileMetadata
{
Hash = file1Hash,
Name = file1
},
new FileMetadata
{
Hash = "File2Hash",
Name = file2
}
}
};
var diff = new FileListDiffService(
hashService,
Mock.Of <ITimeProvider>());
// Act
var result = diff.Compare(filesInDirectory, lastRun.Files);
// Assert
Assert.IsEmpty(result.Added);
Assert.AreEqual(1, result.Modified.Count);
Assert.AreEqual(file2ModifiedHash, result.Modified[0].Hash);
Assert.AreEqual(file2, result.Modified[0].Name);
Assert.IsEmpty(result.Removed);
}
public FileMetadataCollection Apply(DiffResult delta, IList <FileMetadata> target)
{
var metadataList = new List <FileMetadata>();
foreach (var metadata in target)
{
var add = !delta.Removed.Contains(metadata.Name);
if (add)
{
var modified = delta.Modified.SingleOrDefault(m =>
m.Name == metadata.Name);
var hash = modified == null
? metadata.Hash
: modified.Hash;
metadataList.Add(new FileMetadata
{
Hash = hash,
Name = metadata.Name
});
}
}
foreach (var metadata in delta.Added)
{
metadataList.Add(new FileMetadata
{
Hash = metadata.Hash,
Name = metadata.Name
});
}
var collection = new FileMetadataCollection
{
Files = metadataList.OrderBy(m => m.Name).ToList(),
LastUpdated = _timeProvider.UtcNow
};
return(collection);
}
public void RemovedFilesAreIdentified()
{
// Arrange
const string file1 = "File1";
const string file2 = "File2";
var filesInDirectory = new[] { file1 };
var lastRun = new FileMetadataCollection
{
Files = new List <FileMetadata>
{
new FileMetadata {
Name = file1
},
new FileMetadata {
Name = file2
}
}
};
var diff = new FileListDiffService(
Mock.Of <IFileHashService>(),
Mock.Of <ITimeProvider>());
// Act
var result = diff.Compare(filesInDirectory, lastRun.Files);
// Assert
Assert.IsEmpty(result.Added);
Assert.IsEmpty(result.Modified);
Assert.AreEqual(1, result.Removed.Count);
Assert.AreEqual(file2, result.Removed[0]);
}
