public LeafDifference CompareFiles(LeafInformation leftFile, LeafInformation rightFile)
{
var leftFileByteLength = File.ReadAllBytes(leftFile.FullPath).Length;
var rightFileByteLength = File.ReadAllBytes(rightFile.FullPath).Length;
if (leftFileByteLength == rightFileByteLength)
{
return new LeafDifference {
DifferenceType = LeafDifferenceType.None
}
}
;
else
{
return new LeafDifference {
DifferenceType = LeafDifferenceType.Modified
}
};
}
}
public bool MoveNext()
{
if (OnlyLeftFileLeft)
{
var leftFileExists = LeftFiles.MoveNext();
if (leftFileExists)
{
Current = new LeafDifference
{
DifferenceType = LeafDifferenceType.Deleted
};
return true;
}
else
{
return false;
}
}
else if (OnlyRightFileLeft)
{
var rightFileExists = RightFiles.MoveNext();
if (rightFileExists)
{
Current = new LeafDifference
{
DifferenceType = LeafDifferenceType.Created
};
return true;
}
else
{
return false;
}
}
// left file is in the queue
else if (LeftQueuedFile != null)
{
//get the right file
var thereIsRightFile = RightFiles.MoveNext();
if (thereIsRightFile)
{
//if the right file exists => compare the paths
RightQueuedFile = RightFiles.Current;
int pathComparison = string.Compare(LeftQueuedFile.RelativePath, RightQueuedFile.RelativePath);
if (pathComparison < 0)
{
// if the left file is first in order
LeftQueuedFile = null;
RightQueuedFile = RightFiles.Current;
Current = new LeafDifference
{
DifferenceType = LeafDifferenceType.Deleted
};
return true;
}
else if (pathComparison > 0)
{
// if the right file is first in order
Current = new LeafDifference
{
DifferenceType = LeafDifferenceType.Created
};
// left file already in queue
return true;
}
else
{
// paths are the same => compare the files
Current = LeafComparer.CompareFiles(LeftQueuedFile, RightQueuedFile);
LeftQueuedFile = null;
RightQueuedFile = null;
return true;
}
}
else
{
// mark the left file as "deleted"
// remove left file from the queue
Current = new LeafDifference { DifferenceType = LeafDifferenceType.Deleted };
LeftQueuedFile = null;
return true;
}
}
// right file is in the queue
else if (RightQueuedFile != null)
{
//get the right file
var thereIsLeftFile = LeftFiles.MoveNext();
if (thereIsLeftFile)
{
//if the left file exists => compare the paths
LeftQueuedFile = LeftFiles.Current;
int pathComparison = string.Compare(LeftQueuedFile.RelativePath, RightQueuedFile.RelativePath);
if (pathComparison < 0)
{
// left file is first in order
// right file already in queue
LeftQueuedFile = null;
Current = new LeafDifference { DifferenceType = LeafDifferenceType.Deleted };
return true;
}
else if (pathComparison > 0)
{
// right file is first in order
// remove the right file from queue
RightQueuedFile = null;
Current = new LeafDifference { DifferenceType = LeafDifferenceType.Created };
return true;
}
else
{
// paths are the same => compare the files
RightQueuedFile = null;
Current = LeafComparer.CompareFiles(LeftQueuedFile, RightQueuedFile);
return true;
}
}
else
{
// mark the left file as "deleted"
// remove left file from the queue
Current = new LeafDifference { DifferenceType = LeafDifferenceType.Deleted };
LeftQueuedFile = null;
return true;
}
}
// there are no files in the queue
else
{
var leftExists = LeftFiles.MoveNext();
var rightExists = RightFiles.MoveNext();
// both files exist
if (leftExists && rightExists)
{
// compare the paths
var pathComparison = string.Compare(LeftFiles.Current.RelativePath, RightFiles.Current.RelativePath);
// left file is first in order
if (pathComparison < 0)
{
Current = new LeafDifference { DifferenceType = LeafDifferenceType.Deleted };
RightQueuedFile = RightFiles.Current;
return true;
}
// right file is first in order
else if (pathComparison > 0)
{
Current = new LeafDifference { DifferenceType = LeafDifferenceType.Created };
LeftQueuedFile = LeftFiles.Current;
return true;
}
// paths are the same
else
{
Current = LeafComparer.CompareFiles(LeftFiles.Current, RightFiles.Current);
return true;
}
}
// left file exists, but there is no right file
else if (leftExists)
{
OnlyLeftFileLeft = true;
Current = new LeafDifference { DifferenceType = LeafDifferenceType.Deleted };
return true;
}
// right file exists, but there is no left file
else if (rightExists)
{
OnlyRightFileLeft = true;
Current = new LeafDifference { DifferenceType = LeafDifferenceType.Created };
return true;
}
// none of the files exist
else
{
return false;
}
}
}
