SSIFilter (Apache Tomcat 8.5.57 API Documentation)

org.apache.catalina.ssi

## Class SSIFilter

- java.lang.Object
- - org.apache.catalina.ssi.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 Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected boolean` | `allowExec` Allow exec (normally blocked for security)
    `protected FilterConfig` | `config`
    `protected Pattern` | `contentTypeRegEx` regex pattern to match when evaluating content types
    `protected int` | `debug` Debug level for this servlet.
    `protected Long` | `expires` Expiration time in seconds for the doc.
    `protected boolean` | `isVirtualWebappRelative` virtual path can be webapp-relative
    `protected Pattern` | `shtmlRegEx` default pattern for ssi filter content type matching

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `SSIFilter()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `destroy()` Called by the web container to indicate to a filter that it is being taken out of service.
    `void` | `doFilter(ServletRequest request, ServletResponse response, FilterChain chain)` 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.
    `void` | `init(FilterConfig config)` Called by the web container to indicate to a filter that it is being placed into service.

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### config

          protected FilterConfig config

    - #### 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`

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