T - Input element typeE - Element typepublic abstract class CartesianProductEnumerator<T,E> extends Object implements Enumerator<E>
| Modifier and Type | Field and Description |
|---|---|
protected T[] |
elements |
private List<Enumerator<T>> |
enumerators |
private boolean |
first |
| Modifier | Constructor and Description |
|---|---|
protected |
CartesianProductEnumerator(List<Enumerator<T>> enumerators) |
| Modifier and Type | Method and Description |
|---|---|
void |
close()
Closes this enumerable and releases resources.
|
boolean |
moveNext()
Advances the enumerator to the next element of the collection.
|
void |
reset()
Sets the enumerator to its initial position, which is before the first
element in the collection.
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitcurrentprivate final List<Enumerator<T>> enumerators
protected final T[] elements
private boolean first
protected CartesianProductEnumerator(List<Enumerator<T>> enumerators)
public boolean moveNext()
EnumeratorAfter an enumerator is created or after the reset method is
called, an enumerator is positioned before the first element of the
collection, and the first call to the moveNext method moves the
enumerator over the first element of the collection.
If moveNext passes the end of the collection, the enumerator
is positioned after the last element in the collection and
moveNext returns false. When the enumerator is at this
position, subsequent calls to moveNext also return false
until #reset is called.
An enumerator remains valid as long as the collection remains
unchanged. If changes are made to the collection, such as adding,
modifying, or deleting elements, the enumerator is irrecoverably
invalidated. The next call to moveNext or Enumerator.reset() may,
at the discretion of the implementation, throw a
ConcurrentModificationException.
moveNext in interface Enumerator<E>true if the enumerator was successfully advanced to the
next element; false if the enumerator has passed the end of
the collectionpublic void reset()
EnumeratorAn enumerator remains valid as long as the collection remains
unchanged. If changes are made to the collection, such as adding,
modifying, or deleting elements, the enumerator is irrecoverably
invalidated. The next call to Enumerator.moveNext() or reset may,
at the discretion of the implementation, throw a
ConcurrentModificationException.
This method is optional; it may throw
UnsupportedOperationException.
Notes to Implementers
All calls to Reset must result in the same state for the enumerator.
The preferred implementation is to move the enumerator to the beginning
of the collection, before the first element. This invalidates the
enumerator if the collection has been modified since the enumerator was
created, which is consistent with Enumerator.moveNext() and
Enumerator.current().
reset in interface Enumerator<E>public void close()
EnumeratorThis method is idempotent. Calling it multiple times has the same effect as calling it once.
close in interface AutoCloseableclose in interface Enumerator<E>Copyright © 2012–2021 The Apache Software Foundation. All rights reserved.