public int rollback() {
currentTable.clear();
currentTable.putAll(committedTable);
int countOfChanges = changedKeys;
changedKeys = 0;
return countOfChanges;
}
public int commit() {
try {
currentTable.write();
} catch (MyException e) {
throw new RuntimeException();
}
committedTable.clear();
committedTable.putAll(currentTable);
int countOfChanges = changedKeys;
changedKeys = 0;
return countOfChanges;
}
public List<String> list() {
List<String> result = new LinkedList<>();
for (String key : currentTable.keySet()) {
result.add(key);
}
return result;
}
@Override
public final boolean exec(State fileMap, final String[] command) {
if (command.length != 1) {
System.err.println("exit: Usage - exit");
return false;
}
try {
((FileMap) fileMap).saveFileMap();
} catch (IOException e) {
System.err.println(e.getMessage());
}
System.exit(0);
return true;
}
public void execute(String[] args, FileMap fileMap) throws MyException {
if (args.length > 1) {
throw new MyException("list: too many arguments");
}
int i = 0;
for (String string : fileMap.keySet()) {
if (i != 0) {
System.out.print(", ");
}
System.out.print(string);
++i;
}
System.out.println();
}
public int size() {
return currentTable.size();
}
public String get(String key) {
if (key == null) {
throw new IllegalArgumentException();
}
return currentTable.get(key);
}
protected MyTable(FileMap passedTable) {
currentTable = passedTable;
committedTable = new FileMap();
committedTable.putAll(passedTable);
changedKeys = 0;
}
