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

Introduction

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

Source

/* 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;

/**
 * Web browser
 * 
 * @author chaostone
 */
public class Browser implements Serializable, Comparable<Browser> {

    private static final long serialVersionUID = -6200607575108416928L;

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

    public final BrowserCategory category;
    public final String version;

    public Browser(BrowserCategory category, String version) {
        super();
        this.category = category;
        this.version = version;
    }

    /**
     * Iterates over all Browsers to compare the browser signature with the user
     * agent string. If no match can be found Browser.UNKNOWN will be returned.
     * 
     * @param agentString
     * @return Browser
     */
    public static Browser parse(final String agentString) {
        if (StringUtils.isEmpty(agentString)) {
            return Browser.UNKNOWN;
        }
        for (BrowserCategory category : BrowserCategory.values()) {
            String version = category.match(agentString);
            if (version != null) {
                String key = category.getName() + "/" + version;
                Browser browser = browsers.get(key);
                if (null == browser) {
                    browser = new Browser(category, version);
                    browsers.put(key, browser);
                }
                return browser;
            }
        }
        logger.debug("unknown browser: {}", agentString);
        return Browser.UNKNOWN;
    }

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

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