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// __________ Imports __________

import com.sun.star.uno.UnoRuntime;

// __________ Implementation __________

/**
 * support ONE singleton uno connection to a running office installation!
 * Can be used to open/use/close connection to uno environment of an already running office.
 * ctor isn't available from outside. You should call static function "getConnection()"
 * to open or use internal set connection which is created one times only.
 *
 */
public class OfficeConnect
{


    /**
     * At first call we create static connection object and get the remote office
     * context and the remote office service manager. A new office process is
     * started if necessary.
     * Then - and for all further requests we return these static connection member.
     */
    public static synchronized OfficeConnect createConnection()
        throws java.lang.Exception
    {
        if (maConnection == null)
        {
            maConnection = new OfficeConnect();
        }
        return maConnection;
    }







    /**
     * ctor
     * We try to open the connection in our ctor ... transparently for the user.
     * We made it private to support singleton pattern of these implementation.
     * see getConnection() for further information
     */
    private OfficeConnect() throws java.lang.Exception
    {
        // get the remote office context. If necessary a new office
        // process is started
        mxOfficeContext = com.sun.star.comp.helper.Bootstrap.bootstrap();
        System.out.println("Connected to a running office ...");
        mxServiceManager = mxOfficeContext.getServiceManager();
    }



    /**
     * create uno components inside remote office process
     * After connection of these process to a running office we have access to remote service manager of it.
     * So we can use it to create all existing services. Use this method to create components by name and
     * get her interface. Casting of it to right target interface is part of your implementation.
     *
     * @param  aType              describe class type of created service
     *                              Returned object can be casted directly to this one.
     *                              Uno query was done by this method automatically.
     * @param  sServiceSpecifier  name of service which should be created
     * @return                    Description of the Returned Value
     */
    public <T> T createRemoteInstance(Class<T> aType, String sServiceSpecifier)
    {
        T aResult = null;
        try
        {
            aResult = UnoRuntime.queryInterface(
                    aType, mxServiceManager.createInstanceWithContext(
                        sServiceSpecifier, mxOfficeContext));
        }
        catch (com.sun.star.uno.Exception ex)
        {
            System.err.println("Couldn't create Service of type " + sServiceSpecifier + ": " + ex);
            ex.printStackTrace();
            System.exit(0);
        }
        return aResult;
    }







    /**
     * member
     */
    // singleton connection instance
    private static OfficeConnect maConnection;

    // reference to remote office context
    private final com.sun.star.uno.XComponentContext  mxOfficeContext;
    // reference to remote service manager
    private final com.sun.star.lang.XMultiComponentFactory  mxServiceManager;
}

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