All Implemented Interfaces:
    Enumeration

All Known Implementing Classes:
    ValuesEnumImpl, BasicNamingEnumeration, IDEnumImpl, AttrEnumImpl

When a method such as list(), listBindings(), or search() returns a NamingEnumeration, any exceptions encountered are reserved until all results have been returned. At the end of the enumeration, the exception is thrown (by hasMore());

For example, if the list() is returning only a partial answer, the corresponding exception would be PartialResultException. list() would first return a NamingEnumeration. When the last of the results has been returned by the NamingEnumeration's next(), invoking hasMore() would result in PartialResultException being thrown.

In another example, if a search() method was invoked with a specified size limit of 'n'. If the answer consists of more than 'n' results, search() would first return a NamingEnumeration. When the n'th result has been returned by invoking next() on the NamingEnumeration, a SizeLimitExceedException would then thrown when hasMore() is invoked.

Note that if the program uses hasMoreElements() and nextElement() instead to iterate through the NamingEnumeration, because these methods cannot throw exceptions, no exception will be thrown. Instead, in the previous example, after the n'th result has been returned by nextElement(), invoking hasMoreElements() would return false.

Note also that NoSuchElementException is thrown if the program invokes next() or nextElement() when there are no elements left in the enumeration. The program can always avoid this exception by using hasMore() and hasMoreElements() to check whether the end of the enumeration has been reached.

If an exception is thrown during an enumeration, the enumeration becomes invalid. Subsequent invocation of any method on that enumeration will yield undefined results.

Also see:

Context#list
Context#listBindings
javax.naming.directory.DirContext#search
javax.naming.directory.Attributes#getAll
javax.naming.directory.Attributes#getIDs
javax.naming.directory.Attribute#getAll
author: Rosanna - Lee

author: Scott - Seligman

since: 1.3 -

 public  void close() throws NamingException
Closes this enumeration.

After this method has been invoked on this enumeration, the
enumeration becomes invalid and subsequent invocation of any of
its methods will yield undefined results.
This method is intended for aborting an enumeration to free up resources.
If an enumeration proceeds to the end--that is, until
hasMoreElements() or hasMore() returns false--
resources will be freed up automatically and there is no need to
explicitly call close().

This method indicates to the service provider that it is free
to release resources associated with the enumeration, and can
notify servers to cancel any outstanding requests. The close()
method is a hint to implementations for managing their resources.
Implementations are encouraged to use appropriate algorithms to
manage their resources when client omits the close() calls.

 public boolean hasMore() throws NamingException
Determines whether there are any more elements in the enumeration.
This method allows naming exceptions encountered while
determining whether there are more elements to be caught and handled
by the application.

 public T next() throws NamingException
Retrieves the next element in the enumeration.
This method allows naming exceptions encountered while
retrieving the next element to be caught and handled
by the application.

Note that next() can also throw the runtime exception
NoSuchElementException to indicate that the caller is
attempting to enumerate beyond the end of the enumeration.
This is different from a NamingException, which indicates
that there was a problem in obtaining the next element,
for example, due to a referral or server unavailability, etc.