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

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

@Deprecated
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