javax.servlet.http

## Class HttpServletRequestWrapper

- java.lang.Object
- - javax.servlet.ServletRequestWrapper
  - - javax.servlet.http.HttpServletRequestWrapper

- All Implemented Interfaces:
    HttpServletRequest, ServletRequest

      public class HttpServletRequestWrapper
      extends ServletRequestWrapper
      implements HttpServletRequest

  Provides a convenient implementation of the HttpServletRequest interface that can be subclassed by developers wishing to adapt the request to a Servlet.

  This class implements the Wrapper or Decorator pattern. Methods default to calling through to the wrapped request object.

  Since:
    Servlet 2.3
  See Also:
    `HttpServletRequest`

- - ### Field Summary

    - ### Fields inherited from interface javax.servlet.http.HttpServletRequest

      `BASIC_AUTH, CLIENT_CERT_AUTH, DIGEST_AUTH, FORM_AUTH`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `HttpServletRequestWrapper(HttpServletRequest request)` Constructs a request object wrapping the given request.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `authenticate(HttpServletResponse response)` The default behavior of this method is to call authenticate on the wrapped request object.
    `String` | `changeSessionId()` The default behavior of this method is to return changeSessionId() on the wrapped request object.
    `String` | `getAuthType()` The default behavior of this method is to return getAuthType() on the wrapped request object.
    `String` | `getContextPath()` The default behavior of this method is to return getContextPath() on the wrapped request object.
    `Cookie[]` | `getCookies()` The default behavior of this method is to return getCookies() on the wrapped request object.
    `long` | `getDateHeader(String name)` The default behavior of this method is to return getDateHeader(String name) on the wrapped request object.
    `String` | `getHeader(String name)` The default behavior of this method is to return getHeader(String name) on the wrapped request object.
    `Enumeration<String>` | `getHeaderNames()` The default behavior of this method is to return getHeaderNames() on the wrapped request object.
    `Enumeration<String>` | `getHeaders(String name)` The default behavior of this method is to return getHeaders(String name) on the wrapped request object.
    `int` | `getIntHeader(String name)` The default behavior of this method is to return getIntHeader(String name) on the wrapped request object.
    `String` | `getMethod()` The default behavior of this method is to return getMethod() on the wrapped request object.
    `Part` | `getPart(String name)` The default behavior of this method is to call getPart on the wrapped request object.
    `Collection<Part>` | `getParts()` The default behavior of this method is to call getParts on the wrapped request object.
    `String` | `getPathInfo()` The default behavior of this method is to return getPathInfo() on the wrapped request object.
    `String` | `getPathTranslated()` The default behavior of this method is to return getPathTranslated() on the wrapped request object.
    `String` | `getQueryString()` The default behavior of this method is to return getQueryString() on the wrapped request object.
    `String` | `getRemoteUser()` The default behavior of this method is to return getRemoteUser() on the wrapped request object.
    `String` | `getRequestedSessionId()` The default behavior of this method is to return getRequestedSessionId() on the wrapped request object.
    `String` | `getRequestURI()` The default behavior of this method is to return getRequestURI() on the wrapped request object.
    `StringBuffer` | `getRequestURL()` The default behavior of this method is to return getRequestURL() on the wrapped request object.
    `String` | `getServletPath()` The default behavior of this method is to return getServletPath() on the wrapped request object.
    `HttpSession` | `getSession()` The default behavior of this method is to return getSession() on the wrapped request object.
    `HttpSession` | `getSession(boolean create)` The default behavior of this method is to return getSession(boolean create) on the wrapped request object.
    `Principal` | `getUserPrincipal()` The default behavior of this method is to return getUserPrincipal() on the wrapped request object.
    `boolean` | `isRequestedSessionIdFromCookie()` The default behavior of this method is to return isRequestedSessionIdFromCookie() on the wrapped request object.
    `boolean` | `isRequestedSessionIdFromUrl()` The default behavior of this method is to return isRequestedSessionIdFromUrl() on the wrapped request object.
    `boolean` | `isRequestedSessionIdFromURL()` The default behavior of this method is to return isRequestedSessionIdFromURL() on the wrapped request object.
    `boolean` | `isRequestedSessionIdValid()` The default behavior of this method is to return isRequestedSessionIdValid() on the wrapped request object.
    `boolean` | `isUserInRole(String role)` The default behavior of this method is to return isUserInRole(String role) on the wrapped request object.
    `void` | `login(String username, String password)` The default behavior of this method is to call login on the wrapped request object.
    `void` | `logout()` The default behavior of this method is to call login on the wrapped request object.
    `<T extends HttpUpgradeHandler> T` | `upgrade(Class<T> handlerClass)` Create an instance of `HttpUpgradeHandler` for an given class and uses it for the http protocol upgrade processing.

    - ### Methods inherited from class javax.servlet.ServletRequestWrapper

      `getAsyncContext, getAttribute, getAttributeNames, getCharacterEncoding, getContentLength, getContentLengthLong, getContentType, getDispatcherType, getInputStream, getLocalAddr, getLocale, getLocales, getLocalName, getLocalPort, getParameter, getParameterMap, getParameterNames, getParameterValues, getProtocol, getReader, getRealPath, getRemoteAddr, getRemoteHost, getRemotePort, getRequest, getRequestDispatcher, getScheme, getServerName, getServerPort, getServletContext, isAsyncStarted, isAsyncSupported, isSecure, isWrapperFor, isWrapperFor, removeAttribute, setAttribute, setCharacterEncoding, setRequest, startAsync, startAsync`

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

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

    - ### Methods inherited from interface javax.servlet.ServletRequest

      `getAsyncContext, getAttribute, getAttributeNames, getCharacterEncoding, getContentLength, getContentLengthLong, getContentType, getDispatcherType, getInputStream, getLocalAddr, getLocale, getLocales, getLocalName, getLocalPort, getParameter, getParameterMap, getParameterNames, getParameterValues, getProtocol, getReader, getRealPath, getRemoteAddr, getRemoteHost, getRemotePort, getRequestDispatcher, getScheme, getServerName, getServerPort, getServletContext, isAsyncStarted, isAsyncSupported, isSecure, removeAttribute, setAttribute, setCharacterEncoding, startAsync, startAsync`

- - ### Constructor Detail

    - #### HttpServletRequestWrapper

          public HttpServletRequestWrapper(HttpServletRequest request)

      Constructs a request object wrapping the given request.
      Throws:
        `IllegalArgumentException` - if the request is null

  - ### Method Detail

    - #### getAuthType

          public String getAuthType()

      The default behavior of this method is to return getAuthType() on the wrapped request object.
      Specified by:
        `getAuthType` in interface `HttpServletRequest`
      Returns:
        one of the static members BASIC_AUTH, FORM_AUTH, CLIENT_CERT_AUTH, DIGEST_AUTH (suitable for == comparison) or the container-specific string indicating the authentication scheme, or `null` if the request was not authenticated.

    - #### getCookies

          public Cookie[] getCookies()

      The default behavior of this method is to return getCookies() on the wrapped request object.
      Specified by:
        `getCookies` in interface `HttpServletRequest`
      Returns:
        an array of all the `Cookies` included with this request, or `null` if the request has no cookies

    - #### getDateHeader

          public long getDateHeader(String name)

      The default behavior of this method is to return getDateHeader(String name) on the wrapped request object.
      Specified by:
        `getDateHeader` in interface `HttpServletRequest`
      Parameters:
        `name` - a `String` specifying the name of the header
      Returns:
        a `long` value representing the date specified in the header expressed as the number of milliseconds since January 1, 1970 GMT, or -1 if the named header was not included with the request

    - #### getHeader

          public String getHeader(String name)

      The default behavior of this method is to return getHeader(String name) on the wrapped request object.
      Specified by:
        `getHeader` in interface `HttpServletRequest`
      Parameters:
        `name` - a `String` specifying the header name
      Returns:
        a `String` containing the value of the requested header, or `null` if the request does not have a header of that name

    - #### getHeaders

          public Enumeration<String> getHeaders(String name)

      The default behavior of this method is to return getHeaders(String name) on the wrapped request object.
      Specified by:
        `getHeaders` in interface `HttpServletRequest`
      Parameters:
        `name` - a `String` specifying the header name
      Returns:
        an `Enumeration` containing the values of the requested header. If the request does not have any headers of that name return an empty enumeration. If the container does not allow access to header information, return null

    - #### getHeaderNames

          public Enumeration<String> getHeaderNames()

      The default behavior of this method is to return getHeaderNames() on the wrapped request object.
      Specified by:
        `getHeaderNames` in interface `HttpServletRequest`
      Returns:
        an enumeration of all the header names sent with this request; if the request has no headers, an empty enumeration; if the servlet container does not allow servlets to use this method, `null`

    - #### getIntHeader

          public int getIntHeader(String name)

      The default behavior of this method is to return getIntHeader(String name) on the wrapped request object.
      Specified by:
        `getIntHeader` in interface `HttpServletRequest`
      Parameters:
        `name` - a `String` specifying the name of a request header
      Returns:
        an integer expressing the value of the request header or -1 if the request doesn't have a header of this name

    - #### getMethod

          public String getMethod()

      The default behavior of this method is to return getMethod() on the wrapped request object.
      Specified by:
        `getMethod` in interface `HttpServletRequest`
      Returns:
        a `String` specifying the name of the method with which this request was made

    - #### getPathInfo

          public String getPathInfo()

      The default behavior of this method is to return getPathInfo() on the wrapped request object.
      Specified by:
        `getPathInfo` in interface `HttpServletRequest`
      Returns:
        a `String`, decoded by the web container, specifying extra path information that comes after the servlet path but before the query string in the request URL; or `null` if the URL does not have any extra path information

    - #### getPathTranslated

          public String getPathTranslated()

      The default behavior of this method is to return getPathTranslated() on the wrapped request object.
      Specified by:
        `getPathTranslated` in interface `HttpServletRequest`
      Returns:
        a `String` specifying the real path, or `null` if the URL does not have any extra path information

    - #### getContextPath

          public String getContextPath()

      The default behavior of this method is to return getContextPath() on the wrapped request object.
      Specified by:
        `getContextPath` in interface `HttpServletRequest`
      Returns:
        a `String` specifying the portion of the request URI that indicates the context of the request
      See Also:
        `ServletContext.getContextPath()`

    - #### getQueryString

          public String getQueryString()

      The default behavior of this method is to return getQueryString() on the wrapped request object.
      Specified by:
        `getQueryString` in interface `HttpServletRequest`
      Returns:
        a `String` containing the query string or `null` if the URL contains no query string. The value is not decoded by the container.

    - #### getRemoteUser

          public String getRemoteUser()

      The default behavior of this method is to return getRemoteUser() on the wrapped request object.
      Specified by:
        `getRemoteUser` in interface `HttpServletRequest`
      Returns:
        a `String` specifying the login of the user making this request, or `null` if the user login is not known

    - #### isUserInRole

          public boolean isUserInRole(String role)

      The default behavior of this method is to return isUserInRole(String role) on the wrapped request object.
      Specified by:
        `isUserInRole` in interface `HttpServletRequest`
      Parameters:
        `role` - a `String` specifying the name of the role
      Returns:
        a `boolean` indicating whether the user making this request belongs to a given role; `false` if the user has not been authenticated

    - #### getUserPrincipal

          public Principal getUserPrincipal()

      The default behavior of this method is to return getUserPrincipal() on the wrapped request object.
      Specified by:
        `getUserPrincipal` in interface `HttpServletRequest`
      Returns:
        a `java.security.Principal` containing the name of the user making this request; `null` if the user has not been authenticated

    - #### getRequestedSessionId

          public String getRequestedSessionId()

      The default behavior of this method is to return getRequestedSessionId() on the wrapped request object.
      Specified by:
        `getRequestedSessionId` in interface `HttpServletRequest`
      Returns:
        a `String` specifying the session ID, or `null` if the request did not specify a session ID
      See Also:
        `HttpServletRequest.isRequestedSessionIdValid()`

    - #### getRequestURI

          public String getRequestURI()

      The default behavior of this method is to return getRequestURI() on the wrapped request object.
      Specified by:
        `getRequestURI` in interface `HttpServletRequest`
      Returns:
        a `String` containing the part of the URL from the protocol name up to the query string
      See Also:
        `HttpUtils.getRequestURL(javax.servlet.http.HttpServletRequest)`

    - #### getRequestURL

          public StringBuffer getRequestURL()

      The default behavior of this method is to return getRequestURL() on the wrapped request object.
      Specified by:
        `getRequestURL` in interface `HttpServletRequest`
      Returns:
        a `StringBuffer` object containing the reconstructed URL

    - #### getServletPath

          public String getServletPath()

      The default behavior of this method is to return getServletPath() on the wrapped request object.
      Specified by:
        `getServletPath` in interface `HttpServletRequest`
      Returns:
        a `String` containing the name or path of the servlet being called, as specified in the request URL, decoded, or an empty string if the servlet used to process the request is matched using the "/*" pattern.

    - #### getSession

          public HttpSession getSession(boolean create)

      The default behavior of this method is to return getSession(boolean create) on the wrapped request object.
      Specified by:
        `getSession` in interface `HttpServletRequest`
      Parameters:
        `create` - `true` to create a new session for this request if necessary; `false` to return `null` if there's no current session
      Returns:
        the `HttpSession` associated with this request or `null` if `create` is `false` and the request has no valid session
      See Also:
        `HttpServletRequest.getSession()`

    - #### getSession

          public HttpSession getSession()

      The default behavior of this method is to return getSession() on the wrapped request object.
      Specified by:
        `getSession` in interface `HttpServletRequest`
      Returns:
        the `HttpSession` associated with this request
      See Also:
        `HttpServletRequest.getSession(boolean)`

    - #### changeSessionId

          public String changeSessionId()

      The default behavior of this method is to return changeSessionId() on the wrapped request object.
      Specified by:
        `changeSessionId` in interface `HttpServletRequest`
      Returns:
        the new session id
      Since:
        Servlet 3.1

    - #### isRequestedSessionIdValid

          public boolean isRequestedSessionIdValid()

      The default behavior of this method is to return isRequestedSessionIdValid() on the wrapped request object.
      Specified by:
        `isRequestedSessionIdValid` in interface `HttpServletRequest`
      Returns:
        `true` if this request has an id for a valid session in the current session context; `false` otherwise
      See Also:
        `HttpServletRequest.getRequestedSessionId()`, `HttpServletRequest.getSession(boolean)`, `HttpSessionContext`

    - #### isRequestedSessionIdFromCookie

          public boolean isRequestedSessionIdFromCookie()

      The default behavior of this method is to return isRequestedSessionIdFromCookie() on the wrapped request object.
      Specified by:
        `isRequestedSessionIdFromCookie` in interface `HttpServletRequest`
      Returns:
        `true` if the session ID came in as a cookie; otherwise, `false`
      See Also:
        `HttpServletRequest.getSession(boolean)`

    - #### isRequestedSessionIdFromURL

          public boolean isRequestedSessionIdFromURL()

      The default behavior of this method is to return isRequestedSessionIdFromURL() on the wrapped request object.
      Specified by:
        `isRequestedSessionIdFromURL` in interface `HttpServletRequest`
      Returns:
        `true` if the session ID came in as part of a URL; otherwise, `false`
      See Also:
        `HttpServletRequest.getSession(boolean)`

    - #### isRequestedSessionIdFromUrl

          public boolean isRequestedSessionIdFromUrl()

      The default behavior of this method is to return isRequestedSessionIdFromUrl() on the wrapped request object.
      Specified by:
        `isRequestedSessionIdFromUrl` in interface `HttpServletRequest`

    - #### authenticate

          public boolean authenticate(HttpServletResponse response)
                               throws IOException,
                                      ServletException

      The default behavior of this method is to call authenticate on the wrapped request object.
      Specified by:
        `authenticate` in interface `HttpServletRequest`
      Parameters:
        `response` - The `HttpServletResponse` associated with this `HttpServletRequest`
      Returns:
        `true` when non-null values were or have been established as the values returned by `getUserPrincipal`, `getRemoteUser`, and `getAuthType`. Return `false` if authentication is incomplete and the underlying login mechanism has committed, in the response, the message (e.g., challenge) and HTTP status code to be returned to the user.
      Throws:
        `IOException` - if an input or output error occurred while reading from this request or writing to the given response
        `ServletException` - if the authentication failed and the caller is responsible for handling the error (i.e., the underlying login mechanism did NOT establish the message and HTTP status code to be returned to the user)
      Since:
        Servlet 3.0

    - #### login

          public void login(String username,
                   String password)
                     throws ServletException

      The default behavior of this method is to call login on the wrapped request object.
      Specified by:
        `login` in interface `HttpServletRequest`
      Parameters:
        `username` - The `String` value corresponding to the login identifier of the user.
        `password` - The password `String` corresponding to the identified user.
      Throws:
        `ServletException` - if the configured login mechanism does not support username password authentication, or if a non-null caller identity had already been established (prior to the call to login), or if validation of the provided username and password fails.
      Since:
        Servlet 3.0

    - #### logout

          public void logout()
                      throws ServletException

      The default behavior of this method is to call login on the wrapped request object.
      Specified by:
        `logout` in interface `HttpServletRequest`
      Throws:
        `ServletException` - if logout fails
      Since:
        Servlet 3.0

    - #### getParts

          public Collection<Part> getParts()
                                    throws IOException,
                                           ServletException

      The default behavior of this method is to call getParts on the wrapped request object.

      Any changes to the returned `Collection` must not affect this `HttpServletRequestWrapper`.

      Specified by:
        `getParts` in interface `HttpServletRequest`
      Returns:
        a (possibly empty) `Collection` of the `Part` components of this request
      Throws:
        `IOException` - if an I/O error occurred during the retrieval of the `Part` components of this request
        `ServletException` - if this request is not of type `multipart/form-data`
      Since:
        Servlet 3.0
      See Also:
        `MultipartConfig.maxFileSize()`, `MultipartConfig.maxRequestSize()`

    - #### getPart

          public Part getPart(String name)
                       throws IOException,
                              ServletException

      The default behavior of this method is to call getPart on the wrapped request object.
      Specified by:
        `getPart` in interface `HttpServletRequest`
      Parameters:
        `name` - the name of the requested `Part`
      Returns:
        The `Part` with the given name, or `null` if this request is of type `multipart/form-data`, but does not contain the requested `Part`
      Throws:
        `IOException` - if an I/O error occurred during the retrieval of the requested `Part`
        `ServletException` - if this request is not of type `multipart/form-data`
      Since:
        Servlet 3.0
      See Also:
        `MultipartConfig.maxFileSize()`, `MultipartConfig.maxRequestSize()`

    - #### upgrade

          public <T extends HttpUpgradeHandler> T upgrade(Class<T> handlerClass)
                                               throws IOException,
                                                      ServletException

      Create an instance of `HttpUpgradeHandler` for an given class and uses it for the http protocol upgrade processing.
      Specified by:
        `upgrade` in interface `HttpServletRequest`
      Parameters:
        `handlerClass` - The `HttpUpgradeHandler` class used for the upgrade.
      Returns:
        an instance of the `HttpUpgradeHandler`
      Throws:
        `IOException` - if an I/O error occurred during the upgrade
        `ServletException` - if the given `handlerClass` fails to be instantiated
      Since:
        Servlet 3.1
      See Also:
        `HttpUpgradeHandler`, `WebConnection`

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