package com.planet_ink.coffee_mud.core.collections;
import java.util.Enumeration;
import java.util.concurrent.atomic.AtomicBoolean;
/*
Copyright 2015-2019 Bo Zimmerman
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.
*/
public class SafeFeedbackEnumeration<K> implements Enumeration<K>
{
private final Enumeration<K> iter;
private final SafeCollectionHost collection;
private final AtomicBoolean returned = new AtomicBoolean(false);
public SafeFeedbackEnumeration(final Enumeration<K> iter, final SafeCollectionHost collection)
{
this.iter = iter;
this.collection = collection;
this.collection.submitIterator(this);
}
@Override
public void finalize() throws Throwable
{
if(!returned.get())
{
collection.returnIterator(this);
returned.set(true);
}
super.finalize();
}
@Override
public boolean hasMoreElements()
{
final boolean hasNext = iter.hasMoreElements();
if((!hasNext)&&(!returned.get()))
{
collection.returnIterator(this);
returned.set(true);
}
return hasNext;
}
@Override
public K nextElement()
{
return iter.nextElement();
}
}
