/// <summary>
/// Files Comparison of Comparator
/// </summary>
/// <param name="result">SyncResult Object to catch Exception Thrown</param>
/// <param name="resultAlbum">Result Album to Store Result</param>
/// <param name="sourceAlbum">Source Album being Compared</param>
/// <param name="targetAlbum">Target Album being Compared</param>
private void compareFiles(SyncResult result, Album[] resultAlbum, Album sourceAlbum, Album targetAlbum)
{
try
{
/* Get the necessary Metadatas and Files (in string) */
List<Files> sourceMetadata = sourceAlbum.getMetadata(); // S'
List<Files> targetMetadata = targetAlbum.getMetadata(); // T'
List<string> sourceFiles = getFilesFromPath(sourceAlbum.getPath()); // S
List<string> targetFiles = getFilesFromPath(targetAlbum.getPath()); // T
/* Merge the Lists into a single List containing all filename (in string) */
List<string> listUnion = mergeLists(sourceAlbum.getPath(), targetAlbum.getPath(),
sourceFiles, targetFiles, sourceMetadata, targetMetadata);
/* Boolean values for Comparison Logic: */
bool sOne; // File exist in S
bool tOne; // File exist in T
bool sTwo; // File exist in S'
bool tTwo; // File exist in T'
bool sS; // S.File == S'.File
bool tT; // T.File == T'.File
bool ST; // S.File == T.File
/* Comparison Logic: */
foreach (string filenames in listUnion)
{
String filename = filenames;
//Console.WriteLine("file: " + filename);
if (filename.Contains(PATH_DELIMITER))
{
filename = filename.Replace(PATH_DELIMITER, "");
}
/* Get the boolean values for the first 4 variables: */
sOne = isFileExist(Album.combinePath(sourceAlbum.getPath(), filename), sourceFiles); // Source FileSystem (S) Exist
tOne = isFileExist(Album.combinePath(targetAlbum.getPath(), filename), targetFiles); // Target FileSystem (T) Exist
sTwo = isFileExist(Album.combinePath(sourceAlbum.getPath(), filename), sourceMetadata); // Source Metadata (S') Exist
tTwo = isFileExist(Album.combinePath(targetAlbum.getPath(), filename), targetMetadata); // Target Metadata (T') Exist
/* Envelope Check: */
// To Check: Use Binary of the form sOne sTwo tOne tTwo
// e.g.: if true true false true -> 1101 = 13
if (sOne && sTwo && tOne && tTwo) // 1111 = 15
{
/* Get boolean for sS tT ST */
Files sourceMTDT = getPhotoFromFilename(sourceMetadata, filename);
Files targetMTDT = getPhotoFromFilename(targetMetadata, filename);
// Use Factory Method Pattern
Files sourceFile = Files.getFilesObject(Album.combinePath(sourceAlbum.getPath(), filename));
Files targetFile = Files.getFilesObject(Album.combinePath(targetAlbum.getPath(), filename));
// Check Files Read and Write Access
if (sourceFile == null || targetFile == null)
continue;
sS = sourceFile.equals(sourceMTDT);
tT = targetFile.equals(targetMTDT);
ST = sourceFile.equals(targetFile);
/* Inner Check: */
if (sS && tT && ST) // 111 = 7
{
// EQUAL: Ignore
continue;
}
else if (sS && tT && !ST) // 110 = 6
{
/* Check for Modification Date and File Size */
checkModificationDate(resultAlbum, sourceFile, targetFile);
continue;
}
else if (sS && !tT && ST) // 101 = 5
{
// UPDATE T'
targetMTDT.update(targetFile);
continue;
}
else if (sS && !tT && !ST) // 100 = 4
{
// TARGET IS NEWER: Add target file to resultAlbum[TARGET_LATEST]
resultAlbum[TARGET_LATEST].add(targetFile);
continue;
}
else if (!sS && tT && ST) // 011 = 3
{
// UPDATE S'
sourceMTDT.update(sourceFile);
continue;
}
else if (!sS && tT && !ST) // 010 = 2
{
// SOURCE IS NEWER: Add source file to resultAlbum[SOURCE_LATEST]
resultAlbum[SOURCE_LATEST].add(sourceFile);
continue;
}
else if (!sS && !tT && ST) // 001 = 1
{
// UPDATE S' & UPDATE T'
sourceMTDT.update(sourceFile);
targetMTDT.update(targetFile);
continue;
}
else // 000 = 0
{
// CONFLICT FILE: Add source file to resultAlbum[SOURCE_CONFLICT]
// Add target file to resultAlbum[TARGET_CONFLICT]
resultAlbum[SOURCE_CONFLICT].add(sourceFile);
resultAlbum[TARGET_CONFLICT].add(targetFile);
continue;
}
}
else if (sOne && sTwo && !tOne && tTwo) // 1101 = 13
{
/* Get boolean for sS tT ST */
Files sourceMTDT = getPhotoFromFilename(sourceMetadata, filename);
// Use Factory Method Pattern
//Files sourceFile = new Photo(Album.combinePath(sourceAlbum.getPath(), filename));
Files sourceFile = Files.getFilesObject(Album.combinePath(sourceAlbum.getPath(), filename));
// Check Files Read and Write Access
if (sourceFile == null)
continue;
sS = sourceFile.equals(sourceMTDT);
if (sS)
{
// TARGET IS DELETED: Add source file to resultAlbum[SOURCE_DELETE]
targetAlbum.trim(Album.combinePath(targetAlbum.getPath(), filename), Album.TRIM_METADATA);
resultAlbum[SOURCE_DELETE].add(sourceFile);
continue;
}
else
{
// SOURCE IS CHANGED: Takes precedence over deletion
// Add source to resultAlbum[SOURCE_LATEST];
resultAlbum[SOURCE_LATEST].add(sourceFile);
continue;
}
}
else if (sOne && !sTwo && tOne && !tTwo) // 1010 = 10
{
/* Get boolean for ST */
// Use Factory Method Pattern
//Files sourceFile = new Photo(Album.combinePath(sourceAlbum.getPath(), filename));
//Files targetFile = new Photo(Album.combinePath(targetAlbum.getPath(), filename));
Files sourceFile = Files.getFilesObject(Album.combinePath(sourceAlbum.getPath(), filename));
Files targetFile = Files.getFilesObject(Album.combinePath(targetAlbum.getPath(), filename));
// Check Files Read and Write Access
if (sourceFile == null || targetFile == null)
continue;
ST = sourceFile.equals(targetFile);
/* Inner Check: */
if (!ST) // 0
{
/* Check for Modification Date and File Size: */
checkModificationDate(resultAlbum, sourceFile, targetFile);
}
/* CREATE S' & CREATE T' */
sourceAlbum.add(sourceFile);
targetAlbum.add(targetFile);
continue;
}
else if (sOne && !sTwo && !tOne && !tTwo) // 1000 = 08
{
// SOURCE IS NEWER: Add source file to resultAlbum[SOURCE_LATEST]
// Use Factory Method Pattern
Files sourceFile = Files.getFilesObject(Album.combinePath(sourceAlbum.getPath(), filename));
Files targetFile = Files.getFilesObject(Album.combinePath(sourceAlbum.getPath(), filename));
// Check Files Read and Write Access
if (sourceFile == null || targetFile == null)
continue;
targetFile.setFullpath(Album.combinePath(targetAlbum.getPath(), filename));
resultAlbum[SOURCE_LATEST].add(sourceFile);
/* CREATE S' & CREATE T' */
sourceAlbum.add(sourceFile);
targetAlbum.add(targetFile);
continue;
}
else if (!sOne && sTwo && tOne && tTwo) // 0111 = 07
{
/* Get boolean for sS tT ST */
Files targetMTDT = getPhotoFromFilename(targetMetadata, filename);
// Use Factory Method Pattern
Files targetFile = Files.getFilesObject(Album.combinePath(targetAlbum.getPath(), filename));
// Check Files Read and Write Access
if (targetFile == null)
continue;
tT = targetFile.equals(targetMTDT);
if (tT)
{
// SOURCE IS DELETED: Add target file to resultAlbum[TARGET_DELETE]
sourceAlbum.trim(Album.combinePath(sourceAlbum.getPath(), filename), Album.TRIM_METADATA);
resultAlbum[TARGET_DELETE].add(targetFile);
continue;
}
else
{
// TARGET IS CHANGED: Takes precedence over deletion
// Add to resultAlbum[TARGET_LATEST]
resultAlbum[TARGET_LATEST].add(targetFile);
continue;
}
}
else if (!sOne && sTwo && !tOne && tTwo) // 0101 = 05
{
Files sourceMTDT = getPhotoFromFilename(sourceMetadata, filename);
Files targetMTDT = getPhotoFromFilename(targetMetadata, filename);
// REMOVE S' REMOVE T'
sourceAlbum.trim(Album.combinePath(sourceAlbum.getPath(), filename), Album.TRIM_METADATA);
targetAlbum.trim(Album.combinePath(targetAlbum.getPath(), filename), Album.TRIM_METADATA);
continue;
}
else if (!sOne && !sTwo && tOne && !tTwo) // 0010 = 02
{
// TARGET IS NEWER: Add target file to resultAlbum[TARGET_LATEST]
// Use Factory Method Pattern
Files targetFile = Files.getFilesObject(Album.combinePath(targetAlbum.getPath(), filename));
Files sourceFile = Files.getFilesObject(Album.combinePath(targetAlbum.getPath(), filename));
// Check Files Read and Write Access
if (targetFile == null || sourceFile == null)
continue;
sourceFile.setFullpath(Album.combinePath(sourceAlbum.getPath(), filename));
resultAlbum[TARGET_LATEST].add(targetFile);
/* CREATE S' & CREATE T' */
sourceAlbum.add(sourceFile);
targetAlbum.add(targetFile);
continue;
}
else // 1110 = 14 ; 1101 = 12 ; 1011 = 11
// 1001 = 09 ; 0110 = 06 ; 0100 = 04
// 0011 = 03 ; 0001 = 01 ; 0000 = 00
{
throw new Exception(INVALID_FILES);
}
}
}
catch (Exception e)
{
result.uaeThrown();
}
}
/// <summary>
/// Folders Comparison of Comparator
/// </summary>
/// <param name="result"></param>
/// <param name="resultAlbum"></param>
/// <param name="recursive"></param>
/// <param name="sourceAlbum"></param>
/// <param name="targetAlbum"></param>
private void compareFolders(SyncResult result, Album[] resultAlbum, Stack<CompareStackContent> recursive, Album sourceAlbum, Album targetAlbum)
{
try
{
/* Get the Necessary Metadata and Folder Info */
List<string> sourceSubFolders = getSubFoldersFromPath(sourceAlbum.getPath());
List<string> targetSubFolders = getSubFoldersFromPath(targetAlbum.getPath());
List<Album> sourceSubAlbums = sourceAlbum.getSubAlbum();
List<Album> targetSubAlbums = targetAlbum.getSubAlbum();
/* Merge into a Single List */
List<string> allSubFolders = mergeLists(sourceAlbum.getPath(), targetAlbum.getPath(),
sourceSubFolders, targetSubFolders,
sourceSubAlbums, targetSubAlbums);
Album newSource, newTarget;
foreach (string subName in allSubFolders)
{
bool SF = isFileExist(subName, sourceSubFolders);
bool TF = isFileExist(subName, targetSubFolders);
bool SA = isFileExist(subName, sourceSubAlbums);
bool TA = isFileExist(subName, targetSubAlbums);
if (SF && SA && TF && TA) // 1111 = 15
{
// ALL EXIST: Recursion
// Get the New Source and Target Album
newSource = getSubAlbum(subName, sourceAlbum);
newTarget = getSubAlbum(subName, targetAlbum);
// Recursion = Push into Stack
CompareStackContent tempStackContent = new CompareStackContent();
tempStackContent.source = newSource;
tempStackContent.target = newTarget;
recursive.Push(tempStackContent);
continue;
}
else if (SF && SA && !TF && TA) // 1101 = 13
{
// TARGET DELETED: Delete Source
newSource = getSubAlbum(subName, sourceAlbum);
targetAlbum.trim(Album.combinePath(targetAlbum.getPath(), subName), Album.TRIM_ALBUM);
resultAlbum[SOURCE_DELETE].add(newSource);
continue;
}
else if (SF && !SA && TF && !TA) // 1010 = 10
{
// CREATE ALBUM METADATA: Recursion
newSource = new Album(Album.combinePath(sourceAlbum.getPath(), subName));
newTarget = new Album(Album.combinePath(targetAlbum.getPath(), subName));
// ADD TO ALBUM
sourceAlbum.add(newSource);
targetAlbum.add(newTarget);
// Recursion = Push into Stack
CompareStackContent tempStackContent = new CompareStackContent();
tempStackContent.source = newSource;
tempStackContent.target = newTarget;
recursive.Push(tempStackContent);
continue;
}
else if (SF && !SA && !TF && !TA) // 1000 = 8
{
try
{
// NEW JOB: Move Source
// POPULATE SA
populate(sourceAlbum, Album.combinePath(sourceAlbum.getPath(), subName));
// COPY ALBUM SA -> TA
populate(targetAlbum, Album.combinePath(targetAlbum.getPath(), subName), sourceAlbum);
newSource = getSubAlbum(subName, sourceAlbum);
resultAlbum[SOURCE_LATEST].add(newSource);
}
catch (UnauthorizedAccessException uae)
{
// IGNORE:
}
continue;
}
else if (!SF && SA && TF && TA) // 0111 = 7
{
// DELETE TF
newTarget = getSubAlbum(subName, targetAlbum);
sourceAlbum.trim(Album.combinePath(sourceAlbum.getPath(), subName), Album.TRIM_ALBUM);
resultAlbum[TARGET_DELETE].add(newTarget);
continue;
}
else if (!SF && SA && !TF && TA) // 0101 = 5
{
// ERASE ALBUM DATA
sourceAlbum.trim(Album.combinePath(sourceAlbum.getPath(), subName), Album.TRIM_ALBUM);
targetAlbum.trim(Album.combinePath(targetAlbum.getPath(), subName), Album.TRIM_ALBUM);
continue;
}
else if (!SF && !SA && TF && !TA) // 0010 = 2
{
try
{
// NEW JOB: Move Target
// POPULATE TA
populate(targetAlbum, Album.combinePath(targetAlbum.getPath(), subName));
// COPY ALBUM TA -> SA
populate(sourceAlbum, Album.combinePath(sourceAlbum.getPath(), subName), targetAlbum);
newTarget = getSubAlbum(subName, targetAlbum);
resultAlbum[TARGET_LATEST].add(newTarget);
}
catch (UnauthorizedAccessException uae)
{
// IGNORE:
}
continue;
}
else // 0000 = 0
{
throw new Exception(INVALID_ALBUM);
}
}
}
catch (UnauthorizedAccessException uae)
{
result.uaeThrown();
}
}
/// <summary>
/// Public compare function:
/// Compare source album with target album and return the difference in an album array
/// containing information about the difference of the two albums.
/// </summary>
/// <param name="sourceAlbum">Source album to be compared (cannot be null).</param>
/// <param name="targetAlbum">Target album to be compared (cannot be null).</param>
/// <returns>
/// Album array containing the difference between the two albums:
/// array[0] contains newer files in source album.
/// array[1] contains newer files in target album.
/// array[2] contains conflict files in source album.
/// array[3] contains conflict files in target album.
/// array[4] contains deleted files in source album.
/// array[5] contains deleted files in target album.
/// </returns>
public SyncResult compare(Album srcAlbum, Album trgAlbum)
{
#region Pre Conditions
Debug.Assert(srcAlbum != null, "Source Album cannot be null");
Debug.Assert(trgAlbum != null, "Target Album cannot be null");
#endregion
#region Initialize Result
SyncResult result = new SyncResult();
Album[] resultAlbum = createCompareResultAlbum();
#endregion
#region Initialize Stack
Stack<CompareStackContent> recursive = new Stack<CompareStackContent>();
CompareStackContent stackContent = new CompareStackContent(srcAlbum,
trgAlbum);
recursive.Push(stackContent);
#endregion
Album sourceAlbum, targetAlbum;
#region Main Loop
do /* Do-While Loop for Performance */
{
/* Get the Element Inside Stack */
stackContent = recursive.Pop();
sourceAlbum = stackContent.source;
targetAlbum = stackContent.target;
/* Files Comparison */
compareFiles(result, resultAlbum, sourceAlbum, targetAlbum);
/* Folders Comparison */
compareFolders(result, resultAlbum, recursive, sourceAlbum, targetAlbum);
} while (recursive.Count != 0);
#endregion
// Put the Result Album in Result
result.setResult(resultAlbum);
#region Post Conditions
Debug.Assert(result != null, "Result cannot be null");
#endregion
return result;
}