org.wildfly.security.util.EnumerationIterator Maven / Gradle / Ivy
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* JBoss, Home of Professional Open Source.
* Copyright 2016 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.wildfly.security.util;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* An enumeration which is also an iterator.
*
* @author David M. Lloyd
*/
public interface EnumerationIterator extends Enumeration, Iterator {
/**
* Determine if there are more elements to iterate over in the direction of this iterator.
*
* @return {@code true} if there are more elements, {@code false} otherwise
*/
default boolean hasMoreElements() {
return hasNext();
}
/**
* Get the next element in the direction of this iterator.
*
* @return the next element
*/
default E nextElement() {
return next();
}
/**
* Get an enumeration iterator over one element.
*
* @param item the element
* @param the element type
* @return the enumeration iterator
*/
static EnumerationIterator over(E item) {
return new EnumerationIterator() {
boolean done;
public boolean hasNext() {
return ! done;
}
public E next() {
if (! hasNext()) throw new NoSuchElementException();
done = true;
return item;
}
};
}
}