/*
 *
 * 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.qpid.server.binding;

import org.apache.qpid.server.exchange.Exchange;
import org.apache.qpid.server.queue.AMQQueue;

import java.util.Collections;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicLong;

public class Binding
{
    private final String _bindingKey;
    private final AMQQueue _queue;
    private final Exchange _exchange;
    private final Map<String, Object> _arguments;
    private final UUID _id;
    private final AtomicLong _matches = new AtomicLong();

    public Binding(UUID id, final String bindingKey, final AMQQueue queue, final Exchange exchange, final Map<String, Object> arguments)
    {
        _id = id;
        _bindingKey = bindingKey;
        _queue = queue;
        _exchange = exchange;
        _arguments = arguments == null ? Collections.EMPTY_MAP : Collections.unmodifiableMap(arguments);
    }

    public UUID getId()
    {
        return _id;
    }

    public String getBindingKey()
    {
        return _bindingKey;
    }

    public AMQQueue getQueue()
    {
        return _queue;
    }

    public Exchange getExchange()
    {
        return _exchange;
    }

    public Map<String, Object> getArguments()
    {
        return _arguments;
    }

    public void incrementMatches()
    {
        _matches.incrementAndGet();
    }

    public long getMatches()
    {
        return _matches.get();
    }

    boolean isDurable()
    {
        return _queue.isDurable() && _exchange.isDurable();
    }

    @Override
    public boolean equals(final Object o)
    {
        if (this == o)
        {
            return true;
        }
        
        if (o == null || !(o instanceof Binding))
        {
            return false;
        }

        final Binding binding = (Binding) o;

        return (_bindingKey == null ? binding.getBindingKey() == null : _bindingKey.equals(binding.getBindingKey()))
            && (_exchange == null ? binding.getExchange() == null : _exchange.equals(binding.getExchange()))
            && (_queue == null ? binding.getQueue() == null : _queue.equals(binding.getQueue()));
    }

    @Override
    public int hashCode()
    {
        int result = _bindingKey == null ? 1 : _bindingKey.hashCode();
        result = 31 * result + (_queue == null ? 3 : _queue.hashCode());
        result = 31 * result + (_exchange == null ? 5 : _exchange.hashCode());
        return result;
    }

}