javax.servlet
Class ServletRequestWrapper

java.lang.Object
  extended by 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
ServletRequestWrapper(ServletRequest request)
          Creates a ServletRequest adaptor wrapping the given request object.
 
Method Summary
 AsyncContext getAsyncContext()
          Gets the AsyncContext that was created or reinitialized by the most recent invocation of startAsync() or startAsync(ServletRequest,ServletResponse) on the wrapped request.
 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.
 java.lang.String getContentType()
          The default behavior of this method is to return getContentType() on the wrapped request object.
 DispatcherType getDispatcherType()
          Gets the dispatcher type of the wrapped request.
 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 2.1 of the Java Servlet API, use ServletContext#getRealPath instead
 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()
          Return the wrapped request object.
 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()
          Gets the servlet context to which the wrapped servlet request was last dispatched.
 boolean isAsyncStarted()
          Checks if the wrapped request has been put into asynchronous mode.
 boolean isAsyncSupported()
          Checks if the wrapped request supports asynchronous operation.
 boolean isSecure()
          The default behavior of this method is to return isSecure() on the wrapped request object.
 boolean isWrapperFor(java.lang.Class wrappedType)
          Checks (recursively) if this ServletRequestWrapper wraps a ServletRequest of the given class type.
 boolean isWrapperFor(ServletRequest wrapped)
          Checks (recursively) if this ServletRequestWrapper wraps the given ServletRequest instance.
 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 invoke ServletRequest#startAsync on the wrapped request object.
 AsyncContext startAsync(ServletRequest servletRequest, ServletResponse servletResponse)
          The default behavior of this method is to invoke ServletRequest#startAsync(ServletRequest, ServletResponse) 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.

Throws:
java.lang.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:
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 - String containing the name of the character encoding.
Throws:
java.io.UnsupportedEncodingException - if this ServletRequest is still in a state where a character encoding may be set, but the specified encoding is invalid

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 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

getRealPath

public java.lang.String getRealPath(java.lang.String path)
Deprecated. As of Version 2.1 of the Java Servlet API, use ServletContext#getRealPath instead

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
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()
Gets the servlet context to which the wrapped servlet request was last dispatched.

Specified by:
getServletContext in interface ServletRequest
Returns:
the servlet context to which the wrapped servlet request was last dispatched
Since:
Servlet 3.0

startAsync

public AsyncContext startAsync()
                        throws java.lang.IllegalStateException
The default behavior of this method is to invoke ServletRequest#startAsync on the wrapped request object.

Specified by:
startAsync in interface ServletRequest
Returns:
the (re)initialized AsyncContext
Throws:
IllegalStateException - if the request is within the scope of a filter or servlet that does not support asynchronous operations (that is, isAsyncSupported() returns false), or if this method is called again without any asynchronous dispatch (resulting from one of the AsyncContext#dispatch methods), is called outside the scope of any such dispatch, or is called again within the scope of the same dispatch, or if the response has already been closed
Since:
Servlet 3.0
See Also:
ServletRequest#startAsync

startAsync

public AsyncContext startAsync(ServletRequest servletRequest,
                               ServletResponse servletResponse)
                        throws java.lang.IllegalStateException
The default behavior of this method is to invoke ServletRequest#startAsync(ServletRequest, ServletResponse) on the wrapped request object.

Specified by:
startAsync in interface ServletRequest
Parameters:
servletRequest - the ServletRequest used to initialize the AsyncContext
servletResponse - the ServletResponse used to initialize the AsyncContext
Returns:
the (re)initialized AsyncContext
Throws:
IllegalStateException - if the request is within the scope of a filter or servlet that does not support asynchronous operations (that is, isAsyncSupported() returns false), or if this method is called again without any asynchronous dispatch (resulting from one of the AsyncContext#dispatch methods), is called outside the scope of any such dispatch, or is called again within the scope of the same dispatch, or if the response has already been closed
Since:
Servlet 3.0
See Also:
ServletRequest#startAsync(ServletRequest, ServletResponse)

isAsyncStarted

public boolean isAsyncStarted()
Checks if the wrapped request has been put into asynchronous mode.

Specified by:
isAsyncStarted in interface ServletRequest
Returns:
true if this request has been put into asynchronous mode, false otherwise
Since:
Servlet 3.0
See Also:
ServletRequest#isAsyncStarted

isAsyncSupported

public boolean isAsyncSupported()
Checks if the wrapped request supports asynchronous operation.

Specified by:
isAsyncSupported in interface ServletRequest
Returns:
true if this request supports asynchronous operation, false otherwise
Since:
Servlet 3.0
See Also:
ServletRequest#isAsyncSupported

getAsyncContext

public AsyncContext getAsyncContext()
Gets the AsyncContext that was created or reinitialized by the most recent invocation of startAsync() or startAsync(ServletRequest,ServletResponse) on the wrapped request.

Specified by:
getAsyncContext in interface ServletRequest
Returns:
the AsyncContext that was created or reinitialized by the most recent invocation of startAsync() or startAsync(ServletRequest,ServletResponse) on the wrapped request
Throws:
IllegalStateException - if this request has not been put into asynchronous mode, i.e., if neither startAsync() nor startAsync(ServletRequest,ServletResponse) has been called
Since:
Servlet 3.0
See Also:
ServletRequest#getAsyncContext

isWrapperFor

public boolean isWrapperFor(ServletRequest wrapped)
Checks (recursively) if this ServletRequestWrapper wraps the given ServletRequest instance.

Parameters:
wrapped - the ServletRequest instance to search for
Returns:
true if this ServletRequestWrapper wraps the given ServletRequest instance, false otherwise
Since:
Servlet 3.0

isWrapperFor

public boolean isWrapperFor(java.lang.Class wrappedType)
Checks (recursively) if this ServletRequestWrapper wraps a ServletRequest of the given class type.

Parameters:
wrappedType - the ServletRequest class type to search for
Returns:
true if this ServletRequestWrapper wraps a ServletRequest of the given class type, false otherwise
Throws:
IllegalArgumentException - if the given class does not implement ServletRequest
Since:
Servlet 3.0

getDispatcherType

public DispatcherType getDispatcherType()
Gets the dispatcher type of the wrapped request.

Specified by:
getDispatcherType in interface ServletRequest
Returns:
the dispatcher type of the wrapped request
Since:
Servlet 3.0
See Also:
ServletRequest#getDispatcherType


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