public static void main(String args[])
throws DbException, TransactionAbortedException, IOException {
// convert a file
if (args[0].equals("convert")) {
try {
if (args.length == 3) {
HeapFileEncoder.convert(
new File(args[1]),
new File(args[1].replaceAll(".txt", ".dat")),
BufferPool.PAGE_SIZE,
Integer.parseInt(args[2]));
} else if (args.length == 4) {
ArrayList<Type> ts = new ArrayList<Type>();
String[] typeStringAr = args[3].split(",");
for (String s : typeStringAr) {
if (s.toLowerCase().equals("int")) ts.add(Type.INT_TYPE);
else if (s.toLowerCase().equals("string")) ts.add(Type.STRING_TYPE);
else {
System.out.println("Unknown type " + s);
return;
}
}
HeapFileEncoder.convert(
new File(args[1]),
new File(args[1].replaceAll(".txt", ".dat")),
BufferPool.PAGE_SIZE,
Integer.parseInt(args[2]),
ts.toArray(new Type[0]));
} else {
System.out.println("Unexpected number of arguments to convert ");
}
} catch (IOException e) {
throw new RuntimeException(e);
}
} else if (args[0].equals("print")) {
File tableFile = new File(args[1]);
int columns = Integer.parseInt(args[2]);
DbFile table = Utility.openHeapFile(columns, tableFile);
TransactionId tid = new TransactionId();
DbFileIterator it = table.iterator(tid);
if (null == it) {
System.out.println(
"Error: method HeapFile.iterator(TransactionId tid) not yet implemented!");
} else {
it.open();
while (it.hasNext()) {
Tuple t = it.next();
System.out.println(t);
}
it.close();
}
} else if (args[0].equals("parser")) {
// Strip the first argument and call the parser
String[] newargs = new String[args.length - 1];
for (int i = 1; i < args.length; ++i) {
newargs[i - 1] = args[i];
}
try {
// dynamically load Parser -- if it doesn't exist, print error message
Class<?> c = Class.forName("simpledb.Parser");
Class<?> s = String[].class;
java.lang.reflect.Method m = c.getMethod("main", s);
m.invoke(null, (java.lang.Object) newargs);
} catch (ClassNotFoundException cne) {
System.out.println(
"Class Parser not found -- perhaps you are trying to run the parser as a part of lab1?");
} catch (Exception e) {
System.out.println("Error in parser.");
e.printStackTrace();
}
} else {
System.err.println("Unknown command: " + args[0]);
System.exit(1);
}
}