/*
 * JBoss, Home of Professional Open Source.
 * Copyright (c) 2011, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.as.test.integration.common.jms;

import org.jboss.as.arquillian.container.ManagementClient;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/**
 * Utility class for getting implementations of JMSOperations interface
 * @author <a href="jmartisk@redhat.com">Jan Martiska</a>
 */
public class JMSOperationsProvider {

    private static final String PROPERTY_NAME = "jmsoperations.implementation.class";
    private static final String FILE_NAME = "jmsoperations.properties";

    /**
     * Gets an instance of a JMSOperations implementation for a particular JMS provider based on the classname
     * given by property "jmsoperations.implementation.class" in jmsoperations.properties somewhere on the classpath
     * The property should contain a fully qualified name of a class that implements JMSOperations interface
     * The setting in that file can be overriden by a system property declaration
     *
     * @param client {@link ManagementClient} to pass to the JMSOperations implementation class' constructor
     *
     * @return a JMSOperations implementation that is JMS-provider-dependent
     */
    public static JMSOperations getInstance(ManagementClient client) {
        String className;
        // first try to get the property from system properties
        className = System.getProperty(PROPERTY_NAME);
        // if this was not defined, try to get it from jmsoperations.properties
        if(className == null) {
            ClassLoader tccl = Thread.currentThread().getContextClassLoader();
            InputStream stream = tccl.getResourceAsStream(FILE_NAME);
            Properties propsFromFile = new Properties();
            try {
                propsFromFile.load(stream);
                className = propsFromFile.getProperty(PROPERTY_NAME);
            } catch(IOException ex) {
                throw new RuntimeException(ex);
            }
        }
        if(className == null) {
            throw new JMSOperationsException("Please specify a property " + PROPERTY_NAME + " in " + FILE_NAME);
        }
        System.out.println("Creating instance of class: " + className);
        Object jmsOperationsInstance;
        try {
            Class clazz = Class.forName(className);
            jmsOperationsInstance = clazz.getConstructor(ManagementClient.class).newInstance(client);
        } catch (Exception e) {
            throw new JMSOperationsException(e);
        }
        if(!(jmsOperationsInstance instanceof JMSOperations)) {
            throw new JMSOperationsException("Class " + className + " does not implement interface JMSOperations");
        }
        return (JMSOperations)jmsOperationsInstance;
    }
}
