/**
* EasyBeans
* Copyright (C) 2006 Bull S.A.S.
* Contact: easybeans@ow2.org
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* --------------------------------------------------------------------------
* $Id: NamingEnumerationImpl.java 5369 2010-02-24 14:58:19Z benoitf $
* --------------------------------------------------------------------------
*/
package org.ow2.easybeans.naming.context;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.NoSuchElementException;
import javax.naming.NameClassPair;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
/**
* Implementation of the NamingEnumeration for list operations Each element is
* of type NameClassPair.
* @author Florent Benoit
*/
public class NamingEnumerationImpl implements NamingEnumeration<NameClassPair> {
/**
* list of names.
*/
private Enumeration names;
/**
* List of bindings.
*/
private Hashtable bindings;
/**
* Constructor. Called by list()
* @param bindings list of bindings
*/
NamingEnumerationImpl(final Hashtable bindings) {
this.bindings = bindings;
this.names = bindings.keys();
}
/**
* Determines whether there are any more elements in the enumeration.
* @return true if there is more in the enumeration ; false otherwise.
* @throws NamingException If a naming exception is encountered while
* attempting to determine whether there is another element in the
* enumeration.
*/
public boolean hasMore() throws NamingException {
return names.hasMoreElements();
}
/**
* Retrieves the next element in the enumeration.
* @return The possibly null element in the enumeration. null is only valid
* for enumerations that can return null (e.g. Attribute.getAll()
* returns an enumeration of attribute values, and an attribute
* value can be null).
* @throws NamingException If a naming exception is encountered while
* attempting to retrieve the next element. See NamingException and
* its subclasses for the possible naming exceptions.
*/
public NameClassPair next() throws NamingException {
String name = (String) names.nextElement();
String className = bindings.get(name).getClass().getName();
return new NameClassPair(name, className);
}
/**
* Closes this enumeration.
*/
public void close() {
}
/**
* Returns the next element of this enumeration if this enumeration object
* has at least one more element to provide.
* @return the next element of this enumeration.
*/
public NameClassPair nextElement() {
try {
return next();
} catch (NamingException e) {
throw new NoSuchElementException(e.toString());
}
}
/**
* Tests if this enumeration contains more elements.
* @return <code>true</code> if and only if this enumeration object
* contains at least one more element to provide; <code>false</code>
* otherwise.
*/
public boolean hasMoreElements() {
try {
return hasMore();
} catch (NamingException e) {
return false;
}
}
}