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# Class org.w3c.jigsaw.filters.LogFilter

    java.lang.Object
       |
       +----org.w3c.tools.resources.AttributeHolder
               |
               +----org.w3c.tools.resources.Resource
                       |
                       +----org.w3c.tools.resources.FramedResource
                               |
                               +----org.w3c.tools.resources.ResourceFrame
                                       |
                                       +----org.w3c.tools.resources.ResourceFilter
                                               |
                                               +----org.w3c.jigsaw.filters.LogFilter

public class LogFilter
extends ResourceFilter

This filter provides a very flexible logger. It is not designed as a logger, in order to be plugable only on a sub-tree of the URL space (a logger would log all site accesses). It provides as much details as you want, and uses a very simple format: each log entry (or record is made of several lines having the folowing format:

    variable=value

A record starts with the special `url` variable value which provides the requested URL. The for each header that is to be logged, a variable is added in the record, prefixed by its scope. The scope can be either:

request
  to specify a request header,
reply
  to specify a reply header,
server
  to specify global server samples.

As an example, if you configure that filter to log the request's referer and the reply content length, a sample record will look like:

     url=http://www.w3.org/pub/WWW/Jigsaw/
     request.referer=http://www.w3.org/pub/WWW
     reply.content-length=10

##

ATTR_LOGFILE
  Attribute index - The log file to use to emit log record.
ATTR_REPLY_HEADERS
  Attribute index - The HTTP reply headers to dump
ATTR_REQUEST_HEADERS
  Attribute index - The HTTP request headers to dump
DONT_LOG
  Name of the state that when set on the request will prevent logging.
log
  Open log descriptor, to write to the log.
repheaders
  Compiled index of the reply headers to dump.
reqheaders
  Compiled index of the request headers to dump.

##

LogFilter()

##

compileHeaders(HttpMessage, String[])
  Compile the given set of header names into header indexes.
getLogfile()
  Get the log file.
getReplyHeaders()
  Get the list of reply headers to dump.
getRequestHeaders()
  Get the list of request headers to dump.
initialize(Object[])
  Initialize the filter.
log(Request, Reply)
  Log the given request/reply transaction.
openLog()
  Open the log stream, and make it available through `log`.
outgoingFilter(RequestInterface, ReplyInterface)
  Log the request.
setValue(int, Object)
  Traop setValue calls.
writelog(String)
  Write the given string to the log file.

##

DONT_LOG

     public static final String DONT_LOG

  Name of the state that when set on the request will prevent logging.

ATTR_REQUEST_HEADERS

     protected static int ATTR_REQUEST_HEADERS

  Attribute index - The HTTP request headers to dump

ATTR_REPLY_HEADERS

     protected static int ATTR_REPLY_HEADERS

  Attribute index - The HTTP reply headers to dump

ATTR_LOGFILE

     protected static int ATTR_LOGFILE

  Attribute index - The log file to use to emit log record.

reqheaders

     protected HeaderDescription reqheaders[]

  Compiled index of the request headers to dump.

repheaders

     protected HeaderDescription repheaders[]

  Compiled index of the reply headers to dump.

log

     protected RandomAccessFile log

  Open log descriptor, to write to the log.

##

LogFilter

     public LogFilter()

##

compileHeaders

     protected HeaderDescription[] compileHeaders(HttpMessage kind,
                                                  String headers[])

  Compile the given set of header names into header indexes.

  Parameters:
    kind - An instance of the class whose headers are to be dumped.
    headers - The name of headers to compile.
  Returns:
    An array of header description, which will allow fast fetch of header values.

writelog

     protected synchronized void writelog(String record)

  Write the given string to the log file.

  Parameters:
    record - The string to write.

openLog

     protected synchronized void openLog()

  Open the log stream, and make it available through `log`. If opening the stream failed, an appropriate error message is emitted and `log` remains set to null. If a log stream was already opened, it is first closed.

getLogfile

     public File getLogfile()

  Get the log file.

  Returns:
    A File instance, or null if not set.

getRequestHeaders

     public String[] getRequestHeaders()

  Get the list of request headers to dump.

  Returns:
    An array of String containing the name of headers to dump, or null if undefined.

getReplyHeaders

     public String[] getReplyHeaders()

  Get the list of reply headers to dump.

  Returns:
    An array of String containing the name of headers to dump, or null if undefined.

setValue

     public void setValue(int idx,
                          Object value)

  Traop setValue calls. We maintain a compiled version of both the `request-headers` and the `reply-headers` attributes, make sure they stay in sync even when modified.

  Overrides:
    setValue in class ResourceFrame

log

     protected void log(Request request,
                        Reply reply)

  Log the given request/reply transaction. Dump a record for the given transaction.

  Parameters:
    request - The request to log.
    reply - It's associated reply.

outgoingFilter

     public ReplyInterface outgoingFilter(RequestInterface req,
                                          ReplyInterface rep) throws ProtocolException

  Log the request.

  Parameters:
    request - The request that has been handled.
    reply - It's associated reply.
  Overrides:
    outgoingFilter in class ResourceFilter

initialize

     public void initialize(Object values[])

  Initialize the filter.

  Overrides:
    initialize in class FramedResource

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