org.beangle.web.agent.Os.java Source code

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Here is the source code for org.beangle.web.agent.Os.java

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/* Copyright c 2005-2012.
 * Licensed under GNU  LESSER General Public License, Version 3.
 * http://www.gnu.org/licenses
 */
package org.beangle.web.agent;

import java.io.Serializable;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.beangle.commons.collection.CollectUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Os implements Serializable, Comparable<Os> {

    private static final long serialVersionUID = -7506270303767154240L;

    private static Logger logger = LoggerFactory.getLogger(Os.class);
    public static Map<String, Os> osMap = CollectUtils.newHashMap();
    public static final Os UNKNOWN = new Os(OsCategory.UNKNOWN, null);

    public final OsCategory category;
    public final String version;

    private Os(OsCategory category, String version) {
        super();
        this.category = category;
        this.version = version;
    }

    @Override
    public String toString() {
        return category.getName() + " " + (version == null ? "" : version);
    }

    /**
     * Parses user agent string and returns the best match. Returns Os.UNKNOWN
     * if there is no match.
     * 
     * @param agentString
     * @return Os
     */
    public static Os parse(String agentString) {
        if (StringUtils.isEmpty(agentString)) {
            return Os.UNKNOWN;
        }
        for (OsCategory category : OsCategory.values()) {
            String version = category.match(agentString);
            if (version != null) {
                String key = category.getName() + "/" + version;
                Os os = osMap.get(key);
                if (null == os) {
                    os = new Os(category, version);
                    osMap.put(key, os);
                }
                return os;
            }
        }
        logger.debug("unknown browser: {}", agentString);
        return Os.UNKNOWN;
    }

    public int compareTo(Os o) {
        return category.compareTo(o.category);
    }

}