예제 #1
0
  /** Suck up tuples from the source file. */
  private Tuple readNextTuple(DataInputStream dis, int slotId) throws NoSuchElementException {
    // if associated bit is not set, read forward to the next tuple, and
    // return null.
    if (!isSlotUsed(slotId)) {
      for (int i = 0; i < td.getSize(); i++) {
        try {
          dis.readByte();
        } catch (IOException e) {
          throw new NoSuchElementException("error reading empty tuple");
        }
      }
      return null;
    }

    // read fields in the tuple
    Tuple t = new Tuple(td);
    RecordId rid = new RecordId(pid, slotId);
    t.setRecordId(rid);
    try {
      for (int j = 0; j < td.numFields(); j++) {
        Field f = td.getFieldType(j).parse(dis);
        t.setField(j, f);
      }
    } catch (java.text.ParseException e) {
      e.printStackTrace();
      throw new NoSuchElementException("parsing error!");
    }

    return t;
  }
예제 #2
0
 /**
  * Adds the specified tuple to the page; the tuple should be updated to reflect that it is now
  * stored on this page.
  *
  * @throws DbException if the page is full (no empty slots) or tupledesc is mismatch.
  * @param t The tuple to add.
  */
 public void insertTuple(Tuple t) throws DbException {
   // some code goes here
   // not necessary for lab1
   RecordId targetrid = t.getRecordId();
   if (getNumEmptySlots() == 0 || !td.equals(t.getTupleDesc())) {
     throw new DbException("Either page is full or tuple desc doesn't match");
   }
   for (int i = 0; i < getNumTuples(); i++) {
     if (!isSlotUsed(i)) {
       markSlotUsed(i, true);
       RecordId rid = new RecordId(pid, i);
       t.setRecordId(rid);
       tuples[i] = t;
       return;
     }
   }
 }
  /** Unit test for Tuple.getRecordId() and Tuple.setRecordId() */
  @Test
  public void modifyRecordId() {
    Tuple tup1 = new Tuple(Utility.getTupleDesc(1));
    HeapPageId pid1 = new HeapPageId(0, 0);
    RecordId rid1 = new RecordId(pid1, 0);
    tup1.setRecordId(rid1);

    try {
      assertEquals(rid1, tup1.getRecordId());
    } catch (java.lang.UnsupportedOperationException e) {
      // rethrow the exception with an explanation
      throw new UnsupportedOperationException(
          "modifyRecordId() test failed due to "
              + "RecordId.equals() not being implemented.  This is not required for Lab 1, "
              + "but should pass when you do implement the RecordId class.");
    }
  }