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package io.joynr.servlet;

/*
 * #%L
 * %%
 * Copyright (C) 2011 - 2013 BMW Car IT GmbH
 * %%
 * 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.
 * #L%
 */

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

import javax.servlet.ServletContext;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ServletUtil {
    private static final Logger logger = LoggerFactory.getLogger(ServletUtil.class);

    public static Properties loadProperties(String filename, ServletContext servletContext) {
        Properties properties = new Properties();
        InputStream in = null;
        try {
            in = servletContext.getResourceAsStream("/WEB-INF/" + filename);
            if (in == null) {
                logger.error("properties file not found");
            } else {
                properties.load(in);
            }
        } catch (IOException e) {
            logger.error("properties file not loaded", e);
        }
        return properties;
    }

    /**
     * Find a free port on the test system to be used by the servlet engine
     * 
     * @return the socket number
     * @throws IOException in case of I/O failure
     */
    public static int findFreePort() throws IOException {
        ServerSocket socket = null;

        try {
            socket = new ServerSocket(0);

            return socket.getLocalPort();
        } finally {
            if (socket != null) {
                socket.close();
            }
        }
    }

}