javax.servlet

## Class ServletRequestWrapper

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

- All Implemented Interfaces:
    ServletRequest
  Direct Known Subclasses:
    HttpServletRequestWrapper

      public class ServletRequestWrapper
      extends java.lang.Object
      implements ServletRequest

  Provides a convenient implementation of the ServletRequest 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:
    `ServletRequest`

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ServletRequestWrapper(ServletRequest request)` Creates a ServletRequest adaptor wrapping the given request object.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `AsyncContext` | `getAsyncContext()` The default behavior of this method is to return getAsyncContext() on the wrapped request object.
    `java.lang.Object` | `getAttribute(java.lang.String name)` The default behavior of this method is to call getAttribute(String name) on the wrapped request object.
    `java.util.Enumeration<java.lang.String>` | `getAttributeNames()` The default behavior of this method is to return getAttributeNames() on the wrapped request object.
    `java.lang.String` | `getCharacterEncoding()` The default behavior of this method is to return getCharacterEncoding() on the wrapped request object.
    `int` | `getContentLength()` The default behavior of this method is to return getContentLength() on the wrapped request object.
    `long` | `getContentLengthLong()` The default behavior of this method is to return getContentLengthLong() on the wrapped request object.
    `java.lang.String` | `getContentType()` The default behavior of this method is to return getContentType() on the wrapped request object.
    `DispatcherType` | `getDispatcherType()` The default behavior of this method is to call getDispatcherType() on the wrapped request object.
    `ServletInputStream` | `getInputStream()` The default behavior of this method is to return getInputStream() on the wrapped request object.
    `java.lang.String` | `getLocalAddr()` The default behavior of this method is to return getLocalAddr() on the wrapped request object.
    `java.util.Locale` | `getLocale()` The default behavior of this method is to return getLocale() on the wrapped request object.
    `java.util.Enumeration<java.util.Locale>` | `getLocales()` The default behavior of this method is to return getLocales() on the wrapped request object.
    `java.lang.String` | `getLocalName()` The default behavior of this method is to return getLocalName() on the wrapped request object.
    `int` | `getLocalPort()` The default behavior of this method is to return getLocalPort() on the wrapped request object.
    `java.lang.String` | `getParameter(java.lang.String name)` The default behavior of this method is to return getParameter(String name) on the wrapped request object.
    `java.util.Map<java.lang.String,java.lang.String[]>` | `getParameterMap()` The default behavior of this method is to return getParameterMap() on the wrapped request object.
    `java.util.Enumeration<java.lang.String>` | `getParameterNames()` The default behavior of this method is to return getParameterNames() on the wrapped request object.
    `java.lang.String[]` | `getParameterValues(java.lang.String name)` The default behavior of this method is to return getParameterValues(String name) on the wrapped request object.
    `java.lang.String` | `getProtocol()` The default behavior of this method is to return getProtocol() on the wrapped request object.
    `java.io.BufferedReader` | `getReader()` The default behavior of this method is to return getReader() on the wrapped request object.
    `java.lang.String` | `getRealPath(java.lang.String path)` Deprecated. As of Version 3.0 of the Java Servlet API
    `java.lang.String` | `getRemoteAddr()` The default behavior of this method is to return getRemoteAddr() on the wrapped request object.
    `java.lang.String` | `getRemoteHost()` The default behavior of this method is to return getRemoteHost() on the wrapped request object.
    `int` | `getRemotePort()` The default behavior of this method is to return getRemotePort() on the wrapped request object.
    `ServletRequest` | `getRequest()` Get the wrapped request.
    `RequestDispatcher` | `getRequestDispatcher(java.lang.String path)` The default behavior of this method is to return getRequestDispatcher(String path) on the wrapped request object.
    `java.lang.String` | `getScheme()` The default behavior of this method is to return getScheme() on the wrapped request object.
    `java.lang.String` | `getServerName()` The default behavior of this method is to return getServerName() on the wrapped request object.
    `int` | `getServerPort()` The default behavior of this method is to return getServerPort() on the wrapped request object.
    `ServletContext` | `getServletContext()` The default behavior of this method is to return getServletContext() on the wrapped request object.
    `boolean` | `isAsyncStarted()` The default behavior of this method is to return isAsyncStarted() on the wrapped request object.
    `boolean` | `isAsyncSupported()` The default behavior of this method is to return isAsyncSupported() on the wrapped request object.
    `boolean` | `isSecure()` The default behavior of this method is to return isSecure() on the wrapped request object.
    `boolean` | `isWrapperFor(java.lang.Class<?> wrappedType)` TODO SERVLET3 - Add comments
    `boolean` | `isWrapperFor(ServletRequest wrapped)` TODO SERVLET3 - Add comments
    `void` | `removeAttribute(java.lang.String name)` The default behavior of this method is to call removeAttribute(String name) on the wrapped request object.
    `void` | `setAttribute(java.lang.String name, java.lang.Object o)` The default behavior of this method is to return setAttribute(String name, Object o) on the wrapped request object.
    `void` | `setCharacterEncoding(java.lang.String enc)` The default behavior of this method is to set the character encoding on the wrapped request object.
    `void` | `setRequest(ServletRequest request)` Sets the request object being wrapped.
    `AsyncContext` | `startAsync()` The default behavior of this method is to return startAsync() on the wrapped request object.
    `AsyncContext` | `startAsync(ServletRequest servletRequest, ServletResponse servletResponse)` The default behavior of this method is to return startAsync(Runnable) on the wrapped request object.

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

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

- - ### Constructor Detail

    - #### ServletRequestWrapper

          public ServletRequestWrapper(ServletRequest request)

      Creates a ServletRequest adaptor wrapping the given request object.
      Parameters:
        `request` - The request to wrap
      Throws:
        `java.lang.IllegalArgumentException` - if the request is null

  - ### Method Detail

    - #### getRequest

          public ServletRequest getRequest()

      Get the wrapped request.
      Returns:
        the wrapped request object

    - #### setRequest

          public void setRequest(ServletRequest request)

      Sets the request object being wrapped.
      Parameters:
        `request` - The new wrapped request.
      Throws:
        `java.lang.IllegalArgumentException` - if the request is null.

    - #### getAttribute

          public java.lang.Object getAttribute(java.lang.String name)

      The default behavior of this method is to call getAttribute(String name) on the wrapped request object.
      Specified by:
        `getAttribute` in interface `ServletRequest`
      Parameters:
        `name` - a `String` specifying the name of the attribute
      Returns:
        an `Object` containing the value of the attribute, or `null` if the attribute does not exist

    - #### getAttributeNames

          public java.util.Enumeration<java.lang.String> getAttributeNames()

      The default behavior of this method is to return getAttributeNames() on the wrapped request object.
      Specified by:
        `getAttributeNames` in interface `ServletRequest`
      Returns:
        an `Enumeration` of strings containing the names of the request's attributes

    - #### getCharacterEncoding

          public java.lang.String getCharacterEncoding()

      The default behavior of this method is to return getCharacterEncoding() on the wrapped request object.
      Specified by:
        `getCharacterEncoding` in interface `ServletRequest`
      Returns:
        a `String` containing the name of the character encoding, or `null` if the request does not specify a character encoding

    - #### setCharacterEncoding

          public void setCharacterEncoding(java.lang.String enc)
                                    throws java.io.UnsupportedEncodingException

      The default behavior of this method is to set the character encoding on the wrapped request object.
      Specified by:
        `setCharacterEncoding` in interface `ServletRequest`
      Parameters:
        `enc` - a `String` containing the name of the character encoding.
      Throws:
        `java.io.UnsupportedEncodingException` - if this is not a valid encoding

    - #### getContentLength

          public int getContentLength()

      The default behavior of this method is to return getContentLength() on the wrapped request object.
      Specified by:
        `getContentLength` in interface `ServletRequest`
      Returns:
        an integer containing the length of the request body or -1 if the length is not known or is greater than `Integer.MAX_VALUE`

    - #### getContentLengthLong

          public long getContentLengthLong()

      The default behavior of this method is to return getContentLengthLong() on the wrapped request object.
      Specified by:
        `getContentLengthLong` in interface `ServletRequest`
      Returns:
        a long integer containing the length of the request body or -1 if the length is not known
      Since:
        Servlet 3.1

    - #### getContentType

          public java.lang.String getContentType()

      The default behavior of this method is to return getContentType() on the wrapped request object.
      Specified by:
        `getContentType` in interface `ServletRequest`
      Returns:
        a `String` containing the name of the MIME type of the request, or null if the type is not known

    - #### getInputStream

          public ServletInputStream getInputStream()
                                            throws java.io.IOException

      The default behavior of this method is to return getInputStream() on the wrapped request object.
      Specified by:
        `getInputStream` in interface `ServletRequest`
      Returns:
        a `ServletInputStream` object containing the body of the request
      Throws:
        `java.io.IOException` - if an input or output exception occurred

    - #### getParameter

          public java.lang.String getParameter(java.lang.String name)

      The default behavior of this method is to return getParameter(String name) on the wrapped request object.
      Specified by:
        `getParameter` in interface `ServletRequest`
      Parameters:
        `name` - a `String` specifying the name of the parameter
      Returns:
        a `String` representing the single value of the parameter
      See Also:
        `ServletRequest.getParameterValues(java.lang.String)`

    - #### getParameterMap

          public java.util.Map<java.lang.String,java.lang.String[]> getParameterMap()

      The default behavior of this method is to return getParameterMap() on the wrapped request object.
      Specified by:
        `getParameterMap` in interface `ServletRequest`
      Returns:
        an immutable java.util.Map containing parameter names as keys and parameter values as map values. The keys in the parameter map are of type String. The values in the parameter map are of type String array.

    - #### getParameterNames

          public java.util.Enumeration<java.lang.String> getParameterNames()

      The default behavior of this method is to return getParameterNames() on the wrapped request object.
      Specified by:
        `getParameterNames` in interface `ServletRequest`
      Returns:
        an `Enumeration` of `String` objects, each `String` containing the name of a request parameter; or an empty `Enumeration` if the request has no parameters

    - #### getParameterValues

          public java.lang.String[] getParameterValues(java.lang.String name)

      The default behavior of this method is to return getParameterValues(String name) on the wrapped request object.
      Specified by:
        `getParameterValues` in interface `ServletRequest`
      Parameters:
        `name` - a `String` containing the name of the parameter whose value is requested
      Returns:
        an array of `String` objects containing the parameter's values
      See Also:
        `ServletRequest.getParameter(java.lang.String)`

    - #### getProtocol

          public java.lang.String getProtocol()

      The default behavior of this method is to return getProtocol() on the wrapped request object.
      Specified by:
        `getProtocol` in interface `ServletRequest`
      Returns:
        a `String` containing the protocol name and version number

    - #### getScheme

          public java.lang.String getScheme()

      The default behavior of this method is to return getScheme() on the wrapped request object.
      Specified by:
        `getScheme` in interface `ServletRequest`
      Returns:
        a `String` containing the name of the scheme used to make this request

    - #### getServerName

          public java.lang.String getServerName()

      The default behavior of this method is to return getServerName() on the wrapped request object.
      Specified by:
        `getServerName` in interface `ServletRequest`
      Returns:
        a `String` containing the name of the server

    - #### getServerPort

          public int getServerPort()

      The default behavior of this method is to return getServerPort() on the wrapped request object.
      Specified by:
        `getServerPort` in interface `ServletRequest`
      Returns:
        an integer specifying the port number

    - #### getReader

          public java.io.BufferedReader getReader()
                                           throws java.io.IOException

      The default behavior of this method is to return getReader() on the wrapped request object.
      Specified by:
        `getReader` in interface `ServletRequest`
      Returns:
        a `BufferedReader` containing the body of the request
      Throws:
        `java.io.UnsupportedEncodingException` - if the character set encoding used is not supported and the text cannot be decoded
        `java.io.IOException` - if an input or output exception occurred
      See Also:
        `ServletRequest.getInputStream()`

    - #### getRemoteAddr

          public java.lang.String getRemoteAddr()

      The default behavior of this method is to return getRemoteAddr() on the wrapped request object.
      Specified by:
        `getRemoteAddr` in interface `ServletRequest`
      Returns:
        a `String` containing the IP address of the client that sent the request

    - #### getRemoteHost

          public java.lang.String getRemoteHost()

      The default behavior of this method is to return getRemoteHost() on the wrapped request object.
      Specified by:
        `getRemoteHost` in interface `ServletRequest`
      Returns:
        a `String` containing the fully qualified name of the client

    - #### setAttribute

          public void setAttribute(java.lang.String name,
                          java.lang.Object o)

      The default behavior of this method is to return setAttribute(String name, Object o) on the wrapped request object.
      Specified by:
        `setAttribute` in interface `ServletRequest`
      Parameters:
        `name` - a `String` specifying the name of the attribute
        `o` - the `Object` to be stored

    - #### removeAttribute

          public void removeAttribute(java.lang.String name)

      The default behavior of this method is to call removeAttribute(String name) on the wrapped request object.
      Specified by:
        `removeAttribute` in interface `ServletRequest`
      Parameters:
        `name` - a `String` specifying the name of the attribute to remove

    - #### getLocale

          public java.util.Locale getLocale()

      The default behavior of this method is to return getLocale() on the wrapped request object.
      Specified by:
        `getLocale` in interface `ServletRequest`
      Returns:
        the preferred `Locale` for the client

    - #### getLocales

          public java.util.Enumeration<java.util.Locale> getLocales()

      The default behavior of this method is to return getLocales() on the wrapped request object.
      Specified by:
        `getLocales` in interface `ServletRequest`
      Returns:
        an `Enumeration` of preferred `Locale` objects for the client

    - #### isSecure

          public boolean isSecure()

      The default behavior of this method is to return isSecure() on the wrapped request object.
      Specified by:
        `isSecure` in interface `ServletRequest`
      Returns:
        a boolean indicating if the request was made using a secure channel

    - #### getRequestDispatcher

          public RequestDispatcher getRequestDispatcher(java.lang.String path)

      The default behavior of this method is to return getRequestDispatcher(String path) on the wrapped request object.
      Specified by:
        `getRequestDispatcher` in interface `ServletRequest`
      Parameters:
        `path` - a `String` specifying the pathname to the resource. If it is relative, it must be relative against the current servlet.
      Returns:
        a `RequestDispatcher` object that acts as a wrapper for the resource at the specified path, or `null` if the servlet container cannot return a `RequestDispatcher`
      See Also:
        `RequestDispatcher`, `ServletContext.getRequestDispatcher(java.lang.String)`

    - #### getRealPath

          public java.lang.String getRealPath(java.lang.String path)

      Deprecated. As of Version 3.0 of the Java Servlet API
      The default behavior of this method is to return getRealPath(String path) on the wrapped request object.
      Specified by:
        `getRealPath` in interface `ServletRequest`
      Parameters:
        `path` - The virtual path to be converted to a real path
      Returns:
        `ServletContext.getRealPath(String)`

    - #### getRemotePort

          public int getRemotePort()

      The default behavior of this method is to return getRemotePort() on the wrapped request object.
      Specified by:
        `getRemotePort` in interface `ServletRequest`
      Returns:
        an integer specifying the port number
      Since:
        Servlet 2.4

    - #### getLocalName

          public java.lang.String getLocalName()

      The default behavior of this method is to return getLocalName() on the wrapped request object.
      Specified by:
        `getLocalName` in interface `ServletRequest`
      Returns:
        a `String` containing the host name of the IP on which the request was received.
      Since:
        Servlet 2.4

    - #### getLocalAddr

          public java.lang.String getLocalAddr()

      The default behavior of this method is to return getLocalAddr() on the wrapped request object.
      Specified by:
        `getLocalAddr` in interface `ServletRequest`
      Returns:
        a `String` containing the IP address on which the request was received.
      Since:
        Servlet 2.4

    - #### getLocalPort

          public int getLocalPort()

      The default behavior of this method is to return getLocalPort() on the wrapped request object.
      Specified by:
        `getLocalPort` in interface `ServletRequest`
      Returns:
        an integer specifying the port number
      Since:
        Servlet 2.4

    - #### getServletContext

          public ServletContext getServletContext()

      The default behavior of this method is to return getServletContext() on the wrapped request object.
      Specified by:
        `getServletContext` in interface `ServletRequest`
      Returns:
        TODO
      Since:
        Servlet 3.0

    - #### startAsync

          public AsyncContext startAsync()
                                  throws java.lang.IllegalStateException

      The default behavior of this method is to return startAsync() on the wrapped request object.
      Specified by:
        `startAsync` in interface `ServletRequest`
      Returns:
        TODO
      Throws:
        `java.lang.IllegalStateException` - If asynchronous processing is not supported for this request or if the request is already in asynchronous mode
      Since:
        Servlet 3.0

    - #### startAsync

          public AsyncContext startAsync(ServletRequest servletRequest,
                                ServletResponse servletResponse)
                                  throws java.lang.IllegalStateException

      The default behavior of this method is to return startAsync(Runnable) on the wrapped request object.
      Specified by:
        `startAsync` in interface `ServletRequest`
      Parameters:
        `servletRequest` - The ServletRequest with which to initialise the asynchronous context
        `servletResponse` - The ServletResponse with which to initialise the asynchronous context
      Returns:
        TODO
      Throws:
        `java.lang.IllegalStateException` - If asynchronous processing is not supported for this request or if the request is already in asynchronous mode
      Since:
        Servlet 3.0

    - #### isAsyncStarted

          public boolean isAsyncStarted()

      The default behavior of this method is to return isAsyncStarted() on the wrapped request object.
      Specified by:
        `isAsyncStarted` in interface `ServletRequest`
      Returns:
        TODO
      Since:
        Servlet 3.0

    - #### isAsyncSupported

          public boolean isAsyncSupported()

      The default behavior of this method is to return isAsyncSupported() on the wrapped request object.
      Specified by:
        `isAsyncSupported` in interface `ServletRequest`
      Returns:
        TODO
      Since:
        Servlet 3.0

    - #### getAsyncContext

          public AsyncContext getAsyncContext()

      The default behavior of this method is to return getAsyncContext() on the wrapped request object.
      Specified by:
        `getAsyncContext` in interface `ServletRequest`
      Returns:
        The current AsyncContext
      Since:
        Servlet 3.0

    - #### isWrapperFor

          public boolean isWrapperFor(ServletRequest wrapped)

      TODO SERVLET3 - Add comments
      Parameters:
        `wrapped` - The request to compare to the wrapped request
      Returns:
        `true` if the request wrapped by this wrapper (or series of wrappers) is the same as the supplied request, otherwise `false`
      Since:
        Servlet 3.0

    - #### isWrapperFor

          public boolean isWrapperFor(java.lang.Class<?> wrappedType)

      TODO SERVLET3 - Add comments
      Parameters:
        `wrappedType` - The class to compare to the class of the wrapped request
      Returns:
        `true` if the request wrapped by this wrapper (or series of wrappers) is the same type as the supplied type, otherwise `false`
      Since:
        Servlet 3.0

    - #### getDispatcherType

          public DispatcherType getDispatcherType()

      The default behavior of this method is to call getDispatcherType() on the wrapped request object.
      Specified by:
        `getDispatcherType` in interface `ServletRequest`
      Returns:
        TODO
      Since:
        Servlet 3.0

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