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/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2011-2016, TeleStax Inc. and individual contributors
 * by the @authors tag.
 *
 * This program is free software: you can redistribute it and/or modify
 * under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see 
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *   JBoss, Home of Professional Open Source
 *   Copyright 2007-2011, Red Hat, Inc. and individual contributors
 *   by the @authors tag. See the copyright.txt 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.jdiameter.client.impl;

import java.io.InputStream;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * @author  Bartosz Baranowski 
 * @author  Alexandre Mendonca 
 */
@SuppressWarnings("all") //3rd party lib
public class VersionProperties {

    /**
     * The single instance.
     */
    public static final VersionProperties instance = new VersionProperties();

    /**
     * The version properties.
     */
    private Properties props;

    /**
     * Do not allow direct public construction.
     */
    private VersionProperties() {
        props = loadProperties();
    }

    /**
     * Returns an unmodifiable map of version properties.
     *
     * @return
     */
    public Map getProperties() {
        return Collections.unmodifiableMap(props);
    }

    /**
     * Returns the value for the given property name.
     *
     * @param name - The name of the property.
     *
     * @return The property value or null if the property is not set.
     */
    public String getProperty(final String name) {
        return props.getProperty(name);
    }

    /**
     * Returns the version information as a string.
     *
     * @return Basic information as a string.
     */
    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        boolean first = true;
        for (Object key : props.keySet()) {
            if (first) {
                first = false;
            } else {
                sb.append(" , ");
            }
            sb.append(key).append(" = ").append(props.get(key));
        }
        return sb.toString();
    }

    /**
     * Load the version properties from a resource.
     */
    private Properties loadProperties() {

        props = new Properties();

        try {
            InputStream in = VersionProperties.class.getResourceAsStream("/META-INF/version.properties");
            props.load(in);
            in.close();
        } catch (Exception e) {
            // failed to load version properties. go with defaults
            props.put("vendor", "Mobicents");
            props.put("version", "UN.DEFINED");
        }

        return props;
    }

}