test/simulator/main/org/apache/cassandra/simulator/utils/CountingCollection.java

/*
 * 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.cassandra.simulator.utils;

import java.util.AbstractCollection;
import java.util.Iterator;

public class CountingCollection<T> extends AbstractCollection<T>
{
    int count;

    @Override
    public boolean add(T t)
    {
        ++count;
        return true;
    }

    @Override
    public boolean remove(Object o)
    {
        if (count == 0) throw new AssertionError();
        --count;
        return true;
    }

    @Override
    public Iterator<T> iterator()
    {
        throw new UnsupportedOperationException();
    }

    @Override
    public int size()
    {
        return count;
    }
}