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 * 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
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package com.sun.star.comp.connections;

import com.sun.star.comp.loader.FactoryHelper;
import com.sun.star.connection.AlreadyAcceptingException;
import com.sun.star.connection.ConnectionSetupException;
import com.sun.star.connection.XAcceptor;
import com.sun.star.connection.XConnection;
import com.sun.star.lang.XMultiServiceFactory;
import com.sun.star.lang.XSingleServiceFactory;
import com.sun.star.registry.XRegistryKey;

/**
 * A component that implements the <code>XAcceptor</code> interface.
 *
 * <p>The <code>Acceptor</code> is a general component, that uses less general
 * components (like <code>com.sun.star.connection.socketAcceptor</code>) to
 * implement its functionality.</p>
 *
 * @see com.sun.star.connections.XAcceptor
 * @see com.sun.star.connections.XConnection
 * @see com.sun.star.connections.XConnector
 * @see com.sun.star.loader.JavaLoader
 *
 * @since UDK 1.0
 */
public final class Acceptor implements XAcceptor {
    /**
     * The name of the service.
     *
     * <p>The <code>JavaLoader</code> acceses this through reflection.</p>
     *
     * @see com.sun.star.comp.loader.JavaLoader
     */
    public static final String __serviceName
    = "com.sun.star.connection.Acceptor";

    /**
     * Returns a factory for creating the service.
     *
     * <p>This method is called by the <code>JavaLoader</code>.</p>
     *
     * @param implName the name of the implementation for which a service is
     *     requested.
     * @param multiFactory the service manager to be used (if needed).
     * @param regKey the registry key.
     * @return an <code>XSingleServiceFactory</code> for creating the component.
     *
     * @see com.sun.star.comp.loader.JavaLoader
     */
    public static XSingleServiceFactory __getServiceFactory(
        String implName, XMultiServiceFactory multiFactory, XRegistryKey regKey)
    {
        return implName.equals(Acceptor.class.getName())
            ? FactoryHelper.getServiceFactory(Acceptor.class, __serviceName,
                                              multiFactory, regKey)
            : null;
    }

    /**
     * Constructs a new <code>Acceptor</code> that uses the given service
     * factory to create a specific <code>XAcceptor</code>.
     *
     * @param serviceFactory the service factory to use.
     */
    public Acceptor(XMultiServiceFactory serviceFactory) {
        this.serviceFactory = serviceFactory;
    }

    /**
     * Accepts a connection request via the given connection type.
     *
     * <p>This call blocks until a connection has been established.</p>
     *
     * <p>The connection description has the following format:
     * <code><var>type</var></code><!--
     *     -->*(<code><var>key</var>=<var>value</var></code>).
     * The specific <code>XAcceptor</code> implementation is instantiated
     * through the service factory as
     * <code>com.sun.star.connection.<var>type</var>Acceptor</code> (with
     * <code><var>type</var></code> in lower case).</p>
     *
     * @param connectionDescription the description of the connection.
     * @return an <code>XConnection</code> to the client.
     *
     * @see com.sun.star.connections.XConnection
     * @see com.sun.star.connections.XConnector
     */
    public XConnection accept(String connectionDescription) throws
        AlreadyAcceptingException, ConnectionSetupException,
        com.sun.star.lang.IllegalArgumentException
    {
        if (DEBUG) {
            System.err.println("##### " + getClass().getName() + ".accept("
                               + connectionDescription + ")");
        }
        XAcceptor acc;
        synchronized (this) {
            if (acceptor == null) {
                acceptor = (XAcceptor) Implementation.getConnectionService(
                    serviceFactory, connectionDescription, XAcceptor.class,
                    "Acceptor");
                acceptingDescription = connectionDescription;
            } else if (!connectionDescription.equals(acceptingDescription)) {
                throw new AlreadyAcceptingException(acceptingDescription
                                                    + " vs. "
                                                    + connectionDescription);
            }
            acc = acceptor;
        }
        return acc.accept(connectionDescription);
    }

    // see com.sun.star.connection.XAcceptor#stopAccepting
    public void stopAccepting() {
        XAcceptor acc;
        synchronized (this) {
            acc = acceptor;
        }
        acc.stopAccepting();
    }

    private static final boolean DEBUG = false;

    private final XMultiServiceFactory serviceFactory;

    private XAcceptor acceptor = null;
    private String acceptingDescription;
}