databaseinfo.java

GeoIP提供的Java API

/**
 * DatabaseInfo.java
 *
 * Copyright (C) 2003 MaxMind LLC.  All Rights Reserved.
 *
 * This library 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 of the License, or (at your option) any later version.
 *
 * This library 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package com.maxmind.geoip;

import java.util.Date;
import java.text.SimpleDateFormat;
import java.text.ParseException;

/**
 * Encapsulates metadata about the GeoIP database. The database has a date, is a premium or
 * standard version, and is one of the following types:
 *
 * <ul>
 *      <li>Country edition -- this is the most common version of the database. It includes
 *          the name of the country and it's ISO country code given an IP address.
 *      <li>Region edition -- includes the country information as well as
 *          what U.S. state or Canadian province the IP address is from if the IP address
 *          is from the U.S. or Canada.
 *      <li>City edition --  includes country, region, city, postal code, latitude, and
 *          longitude information.
 *      <li>Org edition -- includes country and netblock owner.
 *      <li>ISP edition -- includes country, region, city, postal code, latitude, longitude,
 *          ISP, and organization information.
 * </ul>
 *
 * @see com.maxmind.geoip.LookupService#getDatabaseInfo()
 * @author Matt Tucker
 */
public class DatabaseInfo {

    public final static int COUNTRY_EDITION = 1;
    public final static int REGION_EDITION_REV0 = 7;
    public final static int REGION_EDITION_REV1 = 3;
    public final static int CITY_EDITION_REV0 = 6;
    public final static int CITY_EDITION_REV1 = 2;
    public final static int ORG_EDITION = 5;
    public final static int ISP_EDITION = 4;
    public final static int PROXY_EDITION = 8;
    public final static int ASNUM_EDITION = 9;
    public final static int NETSPEED_EDITION = 10;
    private static SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd");

    private String info;

    /**
     * Creates a new DatabaseInfo object given the database info String.
     * @param info
     */
    public DatabaseInfo(String info) {
        this.info = info;
    }

    public int getType() {
        if (info == null || info.equals("")) {
            return COUNTRY_EDITION;
        }
        else {
            // Get the type code from the database info string and then
            // subtract 105 from the value to preserve compatability with
            // databases from April 2003 and earlier.
            return Integer.parseInt(info.substring(4, 7)) - 105;
        }
    }

    /**
     * Returns true if the database is the premium version.
     *
     * @return true if the premium version of the database.
     */
    public boolean isPremium() {
        return info.indexOf("FREE") < 0;
    }

    /**
     * Returns the date of the database.
     *
     * @return the date of the database.
     */
    public Date getDate() {
        for (int i=0; i<info.length()-9; i++) {
            if (Character.isWhitespace(info.charAt(i))) {
                String dateString = info.substring(i+1, i+9);
                try {
                    synchronized (formatter) {
                        return formatter.parse(dateString);
                    }
                }
                catch (ParseException pe) {  }
                break;
            }
        }
        return null;
    }

    public String toString() {
        return info;
    }
}