/*
* Syncany, www.syncany.org
* Copyright (C) 2011-2015 Philipp C. Heckel <philipp.heckel@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.syncany.operations.down.actions;
import org.syncany.config.Config;
import org.syncany.database.FileVersion;
import org.syncany.database.FileVersion.FileStatus;
import org.syncany.database.FileVersionComparator;
import org.syncany.database.MemoryDatabase;
public class DeleteFileSystemAction extends FileSystemAction {
public DeleteFileSystemAction(Config config, FileVersion fromFileVersion, FileVersion toDeleteFileVersion, MemoryDatabase winningDatabase) {
super(config, winningDatabase, fromFileVersion, toDeleteFileVersion);
}
/**
* Deletes a file locally and/or creates a conflicting file if the
* file does not match the expectations. There are two major cases:
*
* <p>Normal case: The file version of the to-be-deleted file is known. If the file is
* as expected, it is deleted; if not and the file exists, a conflict file is created.
*
* <p>Special case: The file version of the to-be-deleted file in unknown.
* In case to-be-deleted-file exists locally, we need to compare it to
* the local file (especially its checksum!). The {@link FileVersionComparator}
* does, however, perform a cancelling test in which {@link FileVersion}s marked as
* 'DELETED' are not compared in detail (no checksum/attribute/etc. comparisons). To
* circumvent this behavior, we pretend the file has just changed and do the comparison.
* If the to-be-deleted file and file version are equal, the local file is deleted.
* Otherwise, a conflict file is created.
*/
@Override
public FileSystemActionResult execute() throws Exception {
// Special case: locally unknown file to be deleted
if (fileVersion1 == null) {
if (fileExists(fileVersion2)) {
FileVersion pretendChangedFileVersion = fileVersion2.clone();
pretendChangedFileVersion.setStatus(FileStatus.CHANGED);
if (fileAsExpected(pretendChangedFileVersion)) {
deleteFile(fileVersion2);
}
else {
moveToConflictFile(fileVersion2);
}
}
}
// Normal case: locally known file to be deleted
else {
if (!fileAsExpected(fileVersion1)) {
if (fileExists(fileVersion1)) {
moveToConflictFile(fileVersion2);
}
}
else {
deleteFile(fileVersion1);
}
}
return new FileSystemActionResult();
}
@Override
public String toString() {
return "DeleteFileSystemAction [file1=" + fileVersion1 + ", file2=" + fileVersion2 + "]";
}
}