/**
* Выполняет фиксацию изменений.
*
* @return Число записанных изменений.
* @throws java.io.IOException если произошла ошибка ввода/вывода. Целостность таблицы не
* гарантируется.
*/
@Override
public int commit() throws IOException {
int numberOfCommittedChanges = uncommittedChanges();
Set<Map.Entry<String, Storeable>> dbSet = tableIndexedData.entrySet();
for (int nDir = 0; nDir < 16; ++nDir) {
for (int nFile = 0; nFile < 16; ++nFile) {
if (tableFileModified[nDir][nFile]) {
if (tableFiles[nDir][nFile] == null) {
File subDir = new File(tableRootDir, Integer.toString(nDir) + ".dir");
File subFile = new File(subDir, Integer.toString(nFile) + ".dat");
if (!subDir.exists()) {
if (!subDir.mkdir()) {
throw new IllegalStateException("Sub dir was not created");
}
}
tableFiles[nDir][nFile] = new TableFile(subFile);
}
List<TableFile.Entry> fileData = new ArrayList<>();
Iterator<Map.Entry<String, Storeable>> iter = dbSet.iterator();
while (iter.hasNext()) {
Map.Entry<String, Storeable> tempMapEntry = iter.next();
HashcodeDestination dest = new HashcodeDestination(tempMapEntry.getKey());
if (dest.getDir() == nDir && dest.getFile() == nFile) {
fileData.add(
new TableFile.Entry(
tempMapEntry.getKey(),
tableProvider.serialize(this, tempMapEntry.getValue())));
}
}
tableFiles[nDir][nFile].writeEntries(fileData);
tableFileModified[nDir][nFile] = false;
}
}
}
tableOnDisk.clear();
tableOnDisk.putAll(tableIndexedData);
return numberOfCommittedChanges;
}
private void index() {
File[] subDirsList = tableRootDir.listFiles();
if (subDirsList != null) {
for (File subDir : subDirsList) {
int numberOfSubDir;
if (subDir.getName().equals(SignatureFile.signatureFileName)) {
continue;
}
if (!subDir.isDirectory()) {
throw new IllegalStateException("In table root dir found object is not a directory");
}
String[] tableSubDirName = subDir.getName().split("[.]");
try {
numberOfSubDir = Integer.parseInt(tableSubDirName[0]);
} catch (NumberFormatException e) {
throw new IllegalStateException("Table root directory contains not 0.dir ... 15.dir");
}
if (numberOfSubDir < 0
|| numberOfSubDir > 15
|| !tableSubDirName[1].equals("dir")
|| tableSubDirName.length != 2) {
throw new IllegalStateException("Table root directory contains not 0.dir ... 15.dir");
}
File[] subFilesList = subDir.listFiles();
if (subFilesList != null && subFilesList.length == 0) {
throw new IllegalStateException("data base contains empty dir");
}
if (subFilesList != null) {
for (File subFile : subFilesList) {
int numberOfSubFile;
if (!subFile.isFile()) {
throw new IllegalStateException("In table sub dir found object is not a file");
}
String[] dbFileName = subFile.getName().split("[.]");
try {
numberOfSubFile = Integer.parseInt(dbFileName[0]);
} catch (NumberFormatException e) {
throw new IllegalStateException("Table sub directory contains not 0.dat ... 15.dat");
}
if (numberOfSubFile < 0
|| numberOfSubFile > 15
|| !dbFileName[1].equals("dat")
|| dbFileName.length != 2) {
throw new IllegalStateException("Table sub directory contains not 0.dat ... 15.dat");
} else if (subFile.length() == 0) {
throw new IllegalStateException("Empty file in sub dir");
} else {
tableFiles[numberOfSubDir][numberOfSubFile] = new TableFile(subFile);
List<TableFile.Entry> fileData =
tableFiles[numberOfSubDir][numberOfSubFile].readEntries();
for (TableFile.Entry i : fileData) {
HashcodeDestination dest = new HashcodeDestination(i.getKey());
if (dest.getFile() != numberOfSubFile || dest.getDir() != numberOfSubDir) {
throw new IllegalStateException("Wrong key placement");
}
try {
tableIndexedData.put(i.getKey(), tableProvider.deserialize(this, i.getValue()));
} catch (ParseException e) {
throw new IllegalStateException("Can't deserialize", e);
}
}
}
}
}
}
}
tableOnDisk = new HashMap<>(tableIndexedData);
}