/*
* Copyright 2014-2017 Real Logic Ltd.
*
* 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.agrona.collections;
import java.util.AbstractSet;
import java.util.Map;
/**
* Read-only collection which delegates its operations to an underlying map and a couple of functions. Designed
* to easily implement keyset() and values() methods in a map.
*
* @param <V> The generic type of the set.
*/
abstract class MapDelegatingSet<V> extends AbstractSet<V>
{
private final Map<?, ?> delegate;
protected MapDelegatingSet(final Map<?, ?> delegate)
{
this.delegate = delegate;
}
/**
* {@inheritDoc}
*/
public int size()
{
return delegate.size();
}
/**
* {@inheritDoc}
*/
public boolean isEmpty()
{
return delegate.isEmpty();
}
/**
* {@inheritDoc}
*/
public void clear()
{
delegate.clear();
}
/**
* {@inheritDoc}
*/
public abstract boolean contains(Object o);
}