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org.apache.catalina.util
Class CGIProcessEnvironment

java.lang.Object
  org.apache.catalina.util.ProcessEnvironment
      org.apache.catalina.util.CGIProcessEnvironment

public class CGIProcessEnvironment

extends ProcessEnvironment

Encapsulates the CGI Process' environment and rules to derive that environment from the servlet container and request information.

Since:

Tomcat 4.0

Version:

$Revision: 1.4 $, $Date: 2004/08/26 21:42:40 $

Author:

Martin Dengler [root@martindengler.com]

Field Summary

Fields inherited from class org.apache.catalina.util.ProcessEnvironment

command, debug, env, pathInfo, valid, workingDirectory

Constructor Summary

CGIProcessEnvironment(javax.servlet.http.HttpServletRequest req, javax.servlet.ServletContext context)
Creates a ProcessEnvironment and derives the necessary environment, working directory, command, etc.

CGIProcessEnvironment(javax.servlet.http.HttpServletRequest req, javax.servlet.ServletContext context, int debug)
Creates a ProcessEnvironment and derives the necessary environment, working directory, command, etc.

CGIProcessEnvironment(javax.servlet.http.HttpServletRequest req, javax.servlet.ServletContext context, java.lang.String cgiPathPrefix)
Creates a ProcessEnvironment and derives the necessary environment, working directory, command, etc.

CGIProcessEnvironment(javax.servlet.http.HttpServletRequest req, javax.servlet.ServletContext context, java.lang.String cgiPathPrefix, int debug)
Creates a ProcessEnvironment and derives the necessary environment, working directory, command, etc.

Method Summary

protected boolean	deriveProcessEnvironment(javax.servlet.http.HttpServletRequest req) Constructs the CGI environment to be supplied to the invoked CGI script; relies heavliy on Servlet API methods and findCGI
protected java.lang.String[]	findCGI(java.lang.String pathInfo, java.lang.String webAppRootDir, java.lang.String contextPath, java.lang.String servletPath, java.lang.String cgiPathPrefix) Resolves core information about the cgi script.
java.util.Hashtable	getParameters() Gets process' derived query parameters
java.lang.String	toString() Print important CGI environment information in an easy-to-read HTML table

Methods inherited from class org.apache.catalina.util.ProcessEnvironment

blanksToString, getCommand, getContext, getContextPath, getEnvironment, getServletPath, getWebAppRootDir, getWorkingDirectory, isValid, log, nullsToBlanks, nullsToString, setCommand, setEnvironment, setupFromContext, setupFromRequest

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

CGIProcessEnvironment

public CGIProcessEnvironment(javax.servlet.http.HttpServletRequest req,
                             javax.servlet.ServletContext context)

Creates a ProcessEnvironment and derives the necessary environment, working directory, command, etc. The cgi path prefix is initialized to "" (the empty string).

Parameters:

req - HttpServletRequest for information provided by the Servlet API

context - ServletContext for information provided by the Servlet API

CGIProcessEnvironment

public CGIProcessEnvironment(javax.servlet.http.HttpServletRequest req,
                             javax.servlet.ServletContext context,
                             java.lang.String cgiPathPrefix)

Creates a ProcessEnvironment and derives the necessary environment, working directory, command, etc.

Parameters:

req - HttpServletRequest for information provided by the Servlet API

context - ServletContext for information provided by the Servlet API

cgiPathPrefix - subdirectory of webAppRootDir below which the web app's CGIs may be stored; can be null or "".

CGIProcessEnvironment

public CGIProcessEnvironment(javax.servlet.http.HttpServletRequest req,
                             javax.servlet.ServletContext context,
                             int debug)

Creates a ProcessEnvironment and derives the necessary environment, working directory, command, etc.

Parameters:

req - HttpServletRequest for information provided by the Servlet API

context - ServletContext for information provided by the Servlet API

debug - int debug level (0 == none, 6 == lots)

CGIProcessEnvironment

public CGIProcessEnvironment(javax.servlet.http.HttpServletRequest req,
                             javax.servlet.ServletContext context,
                             java.lang.String cgiPathPrefix,
                             int debug)

Creates a ProcessEnvironment and derives the necessary environment, working directory, command, etc.

Parameters:

req - HttpServletRequest for information provided by the Servlet API

context - ServletContext for information provided by the Servlet API

cgiPathPrefix - subdirectory of webAppRootDir below which the web app's CGIs may be stored; can be null or "".

debug - int debug level (0 == none, 6 == lots)

Method Detail

deriveProcessEnvironment

protected boolean deriveProcessEnvironment(javax.servlet.http.HttpServletRequest req)

Constructs the CGI environment to be supplied to the invoked CGI script; relies heavliy on Servlet API methods and findCGI

Overrides:

deriveProcessEnvironment in class ProcessEnvironment

Returns:

true if environment was set OK, false if there was a problem and no environment was set

findCGI

protected java.lang.String[] findCGI(java.lang.String pathInfo,
                                     java.lang.String webAppRootDir,
                                     java.lang.String contextPath,
                                     java.lang.String servletPath,
                                     java.lang.String cgiPathPrefix)

Resolves core information about the cgi script.

Example URI:

 /servlet/cgigateway/dir1/realCGIscript/pathinfo1 

• path = $CATALINA_HOME/mywebapp/dir1/realCGIscript
• scriptName = /servlet/cgigateway/dir1/realCGIscript
• cgiName = /dir1/realCGIscript
• name = realCGIscript

CGI search algorithm: search the real path below <my-webapp-root> and find the first non-directory in the getPathTranslated("/"), reading/searching from left-to-right.

The CGI search path will start at webAppRootDir + File.separator + cgiPathPrefix (or webAppRootDir alone if cgiPathPrefix is null).

cgiPathPrefix is usually set by the calling servlet to the servlet's cgiPathPrefix init parameter

Parameters:

pathInfo - String from HttpServletRequest.getPathInfo()

webAppRootDir - String from context.getRealPath("/")

contextPath - String as from HttpServletRequest.getContextPath()

servletPath - String as from HttpServletRequest.getServletPath()

cgiPathPrefix - subdirectory of webAppRootDir below which the web app's CGIs may be stored; can be null.

Returns:

• path - full file-system path to valid cgi script, or null if no cgi was found
• scriptName - CGI variable SCRIPT_NAME; the full URL path to valid cgi script or null if no cgi was found
• cgiName - servlet pathInfo fragment corresponding to the cgi script itself, or null if not found
• name - simple name (no directories) of the cgi script, or null if no cgi was found

Since:

Tomcat 4.0

toString

public java.lang.String toString()

Print important CGI environment information in an easy-to-read HTML table

Overrides:

toString in class ProcessEnvironment

Returns:

HTML string containing CGI environment info

getParameters

public java.util.Hashtable getParameters()

Gets process' derived query parameters

Returns:

process' query parameters