How to use

isEmpty

method

in

org.apache.commons.collections.buffer.PriorityBuffer

/**
 * Gets the next element to be removed without actually removing it (peek).
 *
 * @return the next element
 * @throws BufferUnderflowException if the buffer is empty
 */
public Object get() {
  if (isEmpty()) {
    throw new BufferUnderflowException();
  } else {
    return elements[1];
  }
}

/**
 * Gets the next element to be removed without actually removing it (peek).
 *
 * @return the next element
 * @throws BufferUnderflowException if the buffer is empty
 */
public Object get() {
  if (isEmpty()) {
    throw new BufferUnderflowException();
  } else {
    return elements[1];
  }
}

/**
 * Pops all elements from the heap and verifies that the elements come off
 * in the correct order.  NOTE: this method empties the heap.
 */
protected void checkOrder(PriorityBuffer h) {
  Integer lastNum = null;
  Integer num = null;
  while (!h.isEmpty()) {
    num = (Integer) h.remove();
    if (h.ascendingOrder) {
      assertTrue(lastNum == null || num.intValue() >= lastNum.intValue());
    } else { // max heap
      assertTrue(lastNum == null || num.intValue() <= lastNum.intValue());
    }
    lastNum = num;
    num = null;
  }
}

heap.add("f");
assertTrue("heap should not be empty after adds", !heap.isEmpty());
    assertTrue("heap should not be empty before all elements are removed", !heap.isEmpty());
  } else {
    assertTrue("heap should be empty after all elements are removed", heap.isEmpty());

public void testBasicComparatorOps() {
  PriorityBuffer heap = new PriorityBuffer(new ReverseComparator(new ComparableComparator()));
  assertTrue("heap should be empty after create", heap.isEmpty());
  heap.add("f");
  assertTrue("heap should not be empty after adds", !heap.isEmpty());
      assertTrue("heap should not be empty before all elements are removed", !heap.isEmpty());
    } else {
      assertTrue("heap should be empty after all elements are removed", heap.isEmpty());

/**
 * Gets the next element to be removed without actually removing it (peek).
 *
 * @return the next element
 * @throws BufferUnderflowException if the buffer is empty
 */
public Object get() {
  if (isEmpty()) {
    throw new BufferUnderflowException();
  } else {
    return elements[1];
  }
}

/**
 * Gets the next element to be removed without actually removing it (peek).
 *
 * @return the next element
 * @throws BufferUnderflowException if the buffer is empty
 */
public Object get() {
  if (isEmpty()) {
    throw new BufferUnderflowException();
  } else {
    return elements[1];
  }
}

/**
 * Gets the next element to be removed without actually removing it (peek).
 *
 * @return the next element
 * @throws BufferUnderflowException if the buffer is empty
 */
public Object get() {
  if (isEmpty()) {
    throw new BufferUnderflowException();
  } else {
    return elements[1];
  }
}

/**
 * Gets the next element to be removed without actually removing it (peek).
 *
 * @return the next element
 * @throws BufferUnderflowException if the buffer is empty
 */
public Object get() {
  if (isEmpty()) {
    throw new BufferUnderflowException();
  } else {
    return elements[1];
  }
}

/**
 * Gets the next element to be removed without actually removing it (peek).
 *
 * @return the next element
 * @throws BufferUnderflowException if the buffer is empty
 */
public Object get() {
  if (isEmpty()) {
    throw new BufferUnderflowException();
  } else {
    return elements[1];
  }
}