Class SSIFilter

  • All Implemented Interfaces:
    Filter

    public class SSIFilter
    extends Object
    implements Filter
    Filter to process SSI requests within a webpage. Mapped to a content types from within web.xml.
    Author:
    David Becker
    See Also:
    SSIServlet
    • Field Detail

      • debug

        protected int debug
        Debug level for this servlet.
      • expires

        protected Long expires
        Expiration time in seconds for the doc.
      • isVirtualWebappRelative

        protected boolean isVirtualWebappRelative
        virtual path can be webapp-relative
      • contentTypeRegEx

        protected Pattern contentTypeRegEx
        regex pattern to match when evaluating content types
      • shtmlRegEx

        protected final Pattern shtmlRegEx
        default pattern for ssi filter content type matching
      • allowExec

        protected boolean allowExec
        Allow exec (normally blocked for security)
    • Constructor Detail

      • SSIFilter

        public SSIFilter()
    • Method Detail

      • init

        public void init​(FilterConfig config)
                  throws ServletException
        Description copied from interface: javax.servlet.Filter
        Called by the web container to indicate to a filter that it is being placed into service. The servlet container calls the init method exactly once after instantiating the filter. The init method must complete successfully before the filter is asked to do any filtering work.

        The web container cannot place the filter into service if the init method either:

        • Throws a ServletException
        • Does not return within a time period defined by the web container
        Specified by:
        init in interface Filter
        Parameters:
        config - The configuration information associated with the filter instance being initialised
        Throws:
        ServletException - if the initialisation fails
      • doFilter

        public void doFilter​(ServletRequest request,
                             ServletResponse response,
                             FilterChain chain)
                      throws IOException,
                             ServletException
        Description copied from interface: javax.servlet.Filter
        The doFilter method of the Filter is called by the container each time a request/response pair is passed through the chain due to a client request for a resource at the end of the chain. The FilterChain passed in to this method allows the Filter to pass on the request and response to the next entity in the chain.

        A typical implementation of this method would follow the following pattern:-
        1. Examine the request
        2. Optionally wrap the request object with a custom implementation to filter content or headers for input filtering
        3. Optionally wrap the response object with a custom implementation to filter content or headers for output filtering
        4. a) Either invoke the next entity in the chain using the FilterChain object (chain.doFilter()),
        4. b) or not pass on the request/response pair to the next entity in the filter chain to block the request processing
        5. Directly set headers on the response after invocation of the next entity in the filter chain.

        Specified by:
        doFilter in interface Filter
        Parameters:
        request - The request to process
        response - The response associated with the request
        chain - Provides access to the next filter in the chain for this filter to pass the request and response to for further processing
        Throws:
        IOException - if an I/O error occurs during this filter's processing of the request
        ServletException - if the processing fails for any other reason
      • destroy

        public void destroy()
        Description copied from interface: javax.servlet.Filter
        Called by the web container to indicate to a filter that it is being taken out of service. This method is only called once all threads within the filter's doFilter method have exited or after a timeout period has passed. After the web container calls this method, it will not call the doFilter method again on this instance of the filter.

        This method gives the filter an opportunity to clean up any resources that are being held (for example, memory, file handles, threads) and make sure that any persistent state is synchronized with the filter's current state in memory.
        Specified by:
        destroy in interface Filter