org.apache.log4j.helpers.NullEnumeration Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.log4j.helpers;
import java.util.Enumeration;
import java.util.NoSuchElementException;
/**
* An always-empty Enumerator.
*
* @since version 1.0
*/
@SuppressWarnings("rawtypes")
public final class NullEnumeration implements Enumeration {
private static final NullEnumeration INSTANCE = new NullEnumeration();
private NullEnumeration() {
}
public static NullEnumeration getInstance() {
return INSTANCE;
}
@Override
public boolean hasMoreElements() {
return false;
}
@Override
public Object nextElement() {
throw new NoSuchElementException();
}
}