ServletRequestWrapper (Java 2 Platform Ent. Ed. v1.4) - Java Platform, Enterprise Edition v1.4 API Specifications

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javax.servlet
Class ServletRequestWrapper

java.lang.Object
  javax.servlet.ServletRequestWrapper

All Implemented Interfaces:: ServletRequest

Direct Known Subclasses:: HttpServletRequestWrapper

public class ServletRequestWrapper
extends 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:: v 2.3
See Also:: ServletRequest

Constructor Summary

ServletRequestWrapper(ServletRequest request)
          Creates a ServletRequest adaptor wrapping the given request object.

Method Summary

Object getAttribute(String name)
          The default behavior of this method is to call getAttribute(String name) on the wrapped request object.

Enumeration getAttributeNames()
          The default behavior of this method is to return getAttributeNames() on the wrapped request object.

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.

String getContentType()
          The default behavior of this method is to return getContentType() on the wrapped request object.

ServletInputStream getInputStream()
          The default behavior of this method is to return getInputStream() on the wrapped request object.

String getLocalAddr()
          The default behavior of this method is to return getLocalAddr() on the wrapped request object.

Locale getLocale()
          The default behavior of this method is to return getLocale() on the wrapped request object.

Enumeration getLocales()
          The default behavior of this method is to return getLocales() on the wrapped request object.

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.

String getParameter(String name)
          The default behavior of this method is to return getParameter(String name) on the wrapped request object.

Map getParameterMap()
          The default behavior of this method is to return getParameterMap() on the wrapped request object.

Enumeration getParameterNames()
          The default behavior of this method is to return getParameterNames() on the wrapped request object.

String[] getParameterValues(String name)
          The default behavior of this method is to return getParameterValues(String name) on the wrapped request object.

String getProtocol()
          The default behavior of this method is to return getProtocol() on the wrapped request object.

BufferedReader getReader()
          The default behavior of this method is to return getReader() on the wrapped request object.

String getRealPath(String path)
          The default behavior of this method is to return getRealPath(String path) on the wrapped request object.

String getRemoteAddr()
          The default behavior of this method is to return getRemoteAddr() on the wrapped request object.

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()
          Return the wrapped request object.

RequestDispatcher getRequestDispatcher(String path)
          The default behavior of this method is to return getRequestDispatcher(String path) on the wrapped request object.

String getScheme()
          The default behavior of this method is to return getScheme() on the wrapped request object.

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.

boolean isSecure()
          The default behavior of this method is to return isSecure() on the wrapped request object.

void removeAttribute(String name)
          The default behavior of this method is to call removeAttribute(String name) on the wrapped request object.

void setAttribute(String name, Object o)
          The default behavior of this method is to return setAttribute(String name, Object o) on the wrapped request object.

void setCharacterEncoding(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.

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.
Throws:: IllegalArgumentException - if the request is null

Method Detail

getRequest

public ServletRequest getRequest()

Return the wrapped request object.

setRequest

public void setRequest(ServletRequest request)

Sets the request object being wrapped.

Throws:: IllegalArgumentException - if the request is null.

getAttribute

public Object getAttribute(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 Enumeration 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 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 chararacter encoding, or null if the request does not specify a character encoding

setCharacterEncoding

public void setCharacterEncoding(String enc)
                          throws 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 chararacter encoding.
Throws:: 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

getContentType

public 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 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:: IOException - if an input or output exception occurred

getParameter

public String getParameter(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 Map 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 Enumeration 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 String[] getParameterValues(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 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 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 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 BufferedReader getReader()
                         throws 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:: IOException - if an input or output exception occurred
See Also:: ServletRequest.getInputStream()

getRemoteAddr

public 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 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(String name,
                         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(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 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 Enumeration 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(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 String getRealPath(String path)

The default behavior of this method is to return getRealPath(String path) on the wrapped request object.

Specified by:: getRealPath in interface ServletRequest

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

Since:: 2.4

getLocalName

public 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:: 2.4

getLocalAddr

public 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:: 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:: 2.4