/*
* 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.felix.log;
import java.util.Enumeration;
import org.osgi.service.log.LogEntry;
/**
* Implementation of the {@link Enumeration} interface for a linked list of
* {@link LogNode} entries.
*/
final class LogNodeEnumeration implements Enumeration
{
/** The next node. */
private LogNode m_next;
/** The last node. */
private final LogNode m_last;
/**
* Creates a new instance.
* @param start the first node to return
* @param end the last node to return
*/
LogNodeEnumeration(final LogNode start, final LogNode end)
{
m_next = start;
m_last = end;
}
/**
* Determines whether there are any more elements to return.
* @return <code>true</code> if there are more elements; <code>false</code> otherwise
*/
public boolean hasMoreElements()
{
return m_next != null;
}
/**
* Returns the current element and moves onto the next element.
* @return the current element
*/
public Object nextElement()
{
LogEntry result = null;
if (m_next == m_last)
{
result = m_next.getEntry();
m_next = null;
}
else if (m_next != null)
{
result = m_next.getEntry();
m_next = m_next.getNextNode();
}
return result;
}
}