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/*
 * Copyright (c) 2008-2020 the original author or authors.
 *
 * 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.cometd.client.transport;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class TransportRegistry {
    private final Map _transports = new HashMap();
    private final List _allowed = new ArrayList();

    public void add(ClientTransport transport) {
        if (transport != null) {
            _transports.put(transport.getName(), transport);
            _allowed.add(transport.getName());
        }
    }

    public Set getKnownTransports() {
        return Collections.unmodifiableSet(_transports.keySet());
    }

    public List getAllowedTransports() {
        return Collections.unmodifiableList(_allowed);
    }

    public List negotiate(Object[] requestedTransports, String bayeuxVersion) {
        List list = new ArrayList();

        for (String transportName : _allowed) {
            for (Object requestedTransportName : requestedTransports) {
                if (requestedTransportName.equals(transportName)) {
                    ClientTransport transport = getTransport(transportName);
                    if (transport.accept(bayeuxVersion)) {
                        list.add(transport);
                    }
                }
            }
        }
        return list;
    }

    public ClientTransport getTransport(String transport) {
        return _transports.get(transport);
    }
}