Glassfish example source code file (ProcessEnvironment.java)

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Java - Glassfish tags/keywords

command, file, hashtable, hashtable, http, info, io, level, log, logging, processenvironment, processenvironment, servlet, servletcontext, servletcontext, string, string, stringbuilder, table, util

The Glassfish ProcessEnvironment.java source code

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 * you may not use this file except in compliance with the License.
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package org.apache.catalina.util;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.logging.Level;
import java.util.logging.Logger;
// import org.apache.catalina.util.StringManager;



/**
 * Encapsulates the Process environment and rules to derive
 * that environment from the servlet container and request information.
 * @author   Martin Dengler [root@martindengler.com]
 * @version  $Revision: 1.3 $, $Date: 2006/03/12 01:27:08 $
 * @since    Tomcat 4.0
 */
public class ProcessEnvironment {


    private static Logger log = Logger.getLogger(
        ProcessEnvironment.class.getName());

    /** context of the enclosing servlet */
    private ServletContext context = null;

    /** real file system directory of the enclosing servlet's web app */
    private String webAppRootDir = null;

    /** context path of enclosing servlet */
    private String contextPath = null;

    /** pathInfo for the current request */
    protected String pathInfo = null;

    /** servlet URI of the enclosing servlet */
    private String servletPath = null;

    /** derived process environment */
    protected Hashtable env = null;

    /** command to be invoked */
    protected String command = null;

    /** whether or not this object is valid or not */
    protected boolean valid = false;

    /** the debugging detail level for this instance. */
    protected int debug = 0;

    /** process' desired working directory */
    protected File workingDirectory = null;


    /**
     * Creates a ProcessEnvironment and derives the necessary environment,
     * working directory, command, etc.
     * @param  req       HttpServletRequest for information provided by
     *                   the Servlet API
     * @param  context   ServletContext for information provided by
     *                   the Servlet API
     */
    public ProcessEnvironment(HttpServletRequest req,
        ServletContext context) {
        this(req, context, 0);
    }


    /**
     * Creates a ProcessEnvironment and derives the necessary environment,
     * working directory, command, etc.
     * @param  req       HttpServletRequest for information provided by
     *                   the Servlet API
     * @param  context   ServletContext for information provided by
     *                   the Servlet API
     * @param  debug     int debug level (0 == none, 4 == medium, 6 == lots)
     */
    public ProcessEnvironment(HttpServletRequest req,
        ServletContext context, int debug) {
            this.debug = debug;
            setupFromContext(context);
            setupFromRequest(req);
            this.valid = deriveProcessEnvironment(req);
            log(this.getClass().getName() + "() ctor, debug level " + debug);
    }


    /**
     * Uses the ServletContext to set some process variables
     * @param  context   ServletContext for information provided by
     *                   the Servlet API
     */
    protected void setupFromContext(ServletContext context) {
        this.context = context;
        this.webAppRootDir = context.getRealPath("/");
    }


    /**
     * Uses the HttpServletRequest to set most process variables
     * @param  req   HttpServletRequest for information provided by
     *               the Servlet API
     */
    protected void setupFromRequest(HttpServletRequest req) {
        this.contextPath = req.getContextPath();
        this.pathInfo = req.getPathInfo();
        this.servletPath = req.getServletPath();
    }


    /**
     * Print important process environment information in an
     * easy-to-read HTML table
     * @return  HTML string containing process environment info
     */
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("<TABLE border=2>");
        sb.append("<tr>