//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//

package org.eclipse.jetty.io;

import java.util.AbstractSet;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.function.Predicate;

import org.eclipse.jetty.util.IncludeExcludeSet;

public class IncludeExcludeConnectionStatistics extends ConnectionStatistics
{
    private final IncludeExcludeSet<Class<? extends Connection>, Connection> _set = new IncludeExcludeSet<>(ConnectionSet.class);

    public void include(String className) throws ClassNotFoundException
    {
        _set.include(connectionForName(className));
    }

    public void include(Class<? extends Connection> clazz)
    {
        _set.include(clazz);
    }

    public void exclude(String className) throws ClassNotFoundException
    {
        _set.exclude(connectionForName(className));
    }

    public void exclude(Class<? extends Connection> clazz)
    {
        _set.exclude(clazz);
    }

    private Class<? extends Connection> connectionForName(String className) throws ClassNotFoundException
    {
        Class<?> aClass = Class.forName(className);
        if (!Connection.class.isAssignableFrom(aClass))
            throw new IllegalArgumentException("Class is not a Connection");

        @SuppressWarnings("unchecked")
        Class<? extends Connection> connectionClass = (Class<? extends Connection>)aClass;
        return connectionClass;
    }

    @Override
    public void onOpened(Connection connection)
    {
        if (_set.test(connection))
            super.onOpened(connection);
    }

    @Override
    public void onClosed(Connection connection)
    {
        if (_set.test(connection))
            super.onClosed(connection);
    }

    public static class ConnectionSet extends AbstractSet<Class<? extends Connection>> implements Predicate<Connection>
    {
        private final Set<Class<? extends Connection>> set = new HashSet<>();

        @Override
        public boolean add(Class<? extends Connection> aClass)
        {
            return set.add(aClass);
        }

        @Override
        public boolean remove(Object o)
        {
            return set.remove(o);
        }

        @Override
        public Iterator<Class<? extends Connection>> iterator()
        {
            return set.iterator();
        }

        @Override
        public int size()
        {
            return set.size();
        }

        @Override
        public boolean test(Connection connection)
        {
            if (connection == null)
                return false;
            return set.stream().anyMatch(c -> c.isAssignableFrom(connection.getClass()));
        }
    }
}
