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package javax.servlet;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Enumeration;
import java.util.Locale;
import java.util.Map;
/**
* 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.
*
* @see javax.servlet.ServletRequest
*
* @since Servlet 2.3
*/
public class ServletRequestWrapper implements ServletRequest {
private ServletRequest request;
/**
* Creates a ServletRequest adaptor wrapping the given request object.
* @throws java.lang.IllegalArgumentException if the request is null
*
* @param request the {@link ServletRequest} to be wrapped
*/
public ServletRequestWrapper(ServletRequest request) {
if (request == null) {
throw new IllegalArgumentException("Request cannot be null");
}
this.request = request;
}
/**
* Return the wrapped request object.
*
* @return the wrapped {@link ServletRequest}
*/
public ServletRequest getRequest() {
return this.request;
}
/**
* Sets the request object being wrapped.
*
* @param request the {@link ServletRequest} to be installed
*
* @throws java.lang.IllegalArgumentException if the request is null.
*
*/
public void setRequest(ServletRequest request) {
if (request == null) {
throw new IllegalArgumentException("Request cannot be null");
}
this.request = request;
}
/**
* The default behavior of this method is to call getAttribute(String name)
* on the wrapped request object.
*/
public Object getAttribute(String name) {
return this.request.getAttribute(name);
}
/**
* The default behavior of this method is to return getAttributeNames()
* on the wrapped request object.
*/
public Enumeration getAttributeNames() {
return this.request.getAttributeNames();
}
/**
* The default behavior of this method is to return getCharacterEncoding()
* on the wrapped request object.
*/
public String getCharacterEncoding() {
return this.request.getCharacterEncoding();
}
/**
* The default behavior of this method is to set the character encoding
* on the wrapped request object.
*/
public void setCharacterEncoding(String enc)
throws UnsupportedEncodingException {
this.request.setCharacterEncoding(enc);
}
/**
* The default behavior of this method is to return getContentLength()
* on the wrapped request object.
*/
public int getContentLength() {
return this.request.getContentLength();
}
/**
* The default behavior of this method is to return getContentLengthLong()
* on the wrapped request object.
*
* @since Servlet 3.1
*/
public long getContentLengthLong() {
return this.request.getContentLengthLong();
}
/**
* The default behavior of this method is to return getContentType()
* on the wrapped request object.
*/
public String getContentType() {
return this.request.getContentType();
}
/**
* The default behavior of this method is to return getInputStream()
* on the wrapped request object.
*/
public ServletInputStream getInputStream() throws IOException {
return this.request.getInputStream();
}
/**
* The default behavior of this method is to return
* getParameter(String name) on the wrapped request object.
*/
public String getParameter(String name) {
return this.request.getParameter(name);
}
/**
* The default behavior of this method is to return getParameterMap()
* on the wrapped request object.
*/
public Map getParameterMap() {
return this.request.getParameterMap();
}
/**
* The default behavior of this method is to return getParameterNames()
* on the wrapped request object.
*/
public Enumeration getParameterNames() {
return this.request.getParameterNames();
}
/**
* The default behavior of this method is to return
* getParameterValues(String name) on the wrapped request object.
*/
public String[] getParameterValues(String name) {
return this.request.getParameterValues(name);
}
/**
* The default behavior of this method is to return getProtocol()
* on the wrapped request object.
*/
public String getProtocol() {
return this.request.getProtocol();
}
/**
* The default behavior of this method is to return getScheme()
* on the wrapped request object.
*/
public String getScheme() {
return this.request.getScheme();
}
/**
* The default behavior of this method is to return getServerName()
* on the wrapped request object.
*/
public String getServerName() {
return this.request.getServerName();
}
/**
* The default behavior of this method is to return getServerPort()
* on the wrapped request object.
*/
public int getServerPort() {
return this.request.getServerPort();
}
/**
* The default behavior of this method is to return getReader()
* on the wrapped request object.
*/
public BufferedReader getReader() throws IOException {
return this.request.getReader();
}
/**
* The default behavior of this method is to return getRemoteAddr()
* on the wrapped request object.
*/
public String getRemoteAddr() {
return this.request.getRemoteAddr();
}
/**
* The default behavior of this method is to return getRemoteHost()
* on the wrapped request object.
*/
public String getRemoteHost() {
return this.request.getRemoteHost();
}
/**
* The default behavior of this method is to return
* setAttribute(String name, Object o) on the wrapped request object.
*/
public void setAttribute(String name, Object o) {
this.request.setAttribute(name, o);
}
/**
* The default behavior of this method is to call
* removeAttribute(String name) on the wrapped request object.
*/
public void removeAttribute(String name) {
this.request.removeAttribute(name);
}
/**
* The default behavior of this method is to return getLocale()
* on the wrapped request object.
*/
public Locale getLocale() {
return this.request.getLocale();
}
/**
* The default behavior of this method is to return getLocales()
* on the wrapped request object.
*/
public Enumeration getLocales() {
return this.request.getLocales();
}
/**
* The default behavior of this method is to return isSecure()
* on the wrapped request object.
*/
public boolean isSecure() {
return this.request.isSecure();
}
/**
* The default behavior of this method is to return
* getRequestDispatcher(String path) on the wrapped request object.
*/
public RequestDispatcher getRequestDispatcher(String path) {
return this.request.getRequestDispatcher(path);
}
/**
* The default behavior of this method is to return
* getRealPath(String path) on the wrapped request object.
*
* @deprecated As of Version 2.1 of the Java Servlet API,
* use {@link ServletContext#getRealPath} instead
*/
@Deprecated
public String getRealPath(String path) {
return this.request.getRealPath(path);
}
/**
* The default behavior of this method is to return
* getRemotePort() on the wrapped request object.
*
* @since Servlet 2.4
*/
public int getRemotePort(){
return this.request.getRemotePort();
}
/**
* The default behavior of this method is to return
* getLocalName() on the wrapped request object.
*
* @since Servlet 2.4
*/
public String getLocalName(){
return this.request.getLocalName();
}
/**
* The default behavior of this method is to return
* getLocalAddr() on the wrapped request object.
*
* @since Servlet 2.4
*/
public String getLocalAddr(){
return this.request.getLocalAddr();
}
/**
* The default behavior of this method is to return
* getLocalPort() on the wrapped request object.
*
* @since Servlet 2.4
*/
public int getLocalPort(){
return this.request.getLocalPort();
}
/**
* Gets the servlet context to which the wrapped servlet request was last
* dispatched.
*
* @return the servlet context to which the wrapped servlet request was
* last dispatched
*
* @since Servlet 3.0
*/
public ServletContext getServletContext() {
return request.getServletContext();
}
/**
* The default behavior of this method is to invoke
* {@link ServletRequest#startAsync} on the wrapped request object.
*
* @return 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, {@link #isAsyncSupported} returns false),
* or if this method is called again without any asynchronous dispatch
* (resulting from one of the {@link 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
*
* @see ServletRequest#startAsync
*
* @since Servlet 3.0
*/
public AsyncContext startAsync() throws IllegalStateException {
return request.startAsync();
}
/**
* The default behavior of this method is to invoke
* {@link ServletRequest#startAsync(ServletRequest, ServletResponse)}
* on the wrapped request object.
*
* @param servletRequest the ServletRequest used to initialize the
* AsyncContext
* @param servletResponse the ServletResponse used to initialize the
* AsyncContext
*
* @return 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, {@link #isAsyncSupported} returns false),
* or if this method is called again without any asynchronous dispatch
* (resulting from one of the {@link 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
*
* @see ServletRequest#startAsync(ServletRequest, ServletResponse)
*
* @since Servlet 3.0
*/
public AsyncContext startAsync(ServletRequest servletRequest,
ServletResponse servletResponse)
throws IllegalStateException {
return request.startAsync(servletRequest, servletResponse);
}
/**
* Checks if the wrapped request has been put into asynchronous mode.
*
* @return true if this request has been put into asynchronous mode,
* false otherwise
*
* @see ServletRequest#isAsyncStarted
*
* @since Servlet 3.0
*/
public boolean isAsyncStarted() {
return request.isAsyncStarted();
}
/**
* Checks if the wrapped request supports asynchronous operation.
*
* @return true if this request supports asynchronous operation, false
* otherwise
*
* @see ServletRequest#isAsyncSupported
*
* @since Servlet 3.0
*/
public boolean isAsyncSupported() {
return request.isAsyncSupported();
}
/**
* Gets the AsyncContext that was created or reinitialized by the
* most recent invocation of {@link #startAsync} or
* {@link #startAsync(ServletRequest,ServletResponse)} on the wrapped
* request.
*
* @return the AsyncContext that was created or reinitialized by the
* most recent invocation of {@link #startAsync} or
* {@link #startAsync(ServletRequest,ServletResponse)} on
* the wrapped request
*
* @throws IllegalStateException if this request has not been put
* into asynchronous mode, i.e., if neither {@link #startAsync} nor
* {@link #startAsync(ServletRequest,ServletResponse)} has been called
*
* @see ServletRequest#getAsyncContext
*
* @since Servlet 3.0
*/
public AsyncContext getAsyncContext() {
return request.getAsyncContext();
}
/**
* Checks (recursively) if this ServletRequestWrapper wraps the given
* {@link ServletRequest} instance.
*
* @param wrapped the ServletRequest instance to search for
*
* @return true if this ServletRequestWrapper wraps the
* given ServletRequest instance, false otherwise
*
* @since Servlet 3.0
*/
public boolean isWrapperFor(ServletRequest wrapped) {
if (request == wrapped) {
return true;
} else if (request instanceof ServletRequestWrapper) {
return ((ServletRequestWrapper) request).isWrapperFor(wrapped);
} else {
return false;
}
}
/**
* Checks (recursively) if this ServletRequestWrapper wraps a
* {@link ServletRequest} of the given class type.
*
* @param wrappedType the ServletRequest class type to
* search for
*
* @return true if this ServletRequestWrapper wraps a
* ServletRequest of the given class type, false otherwise
*
* @throws IllegalArgumentException if the given class does not
* implement {@link ServletRequest}
*
* @since Servlet 3.0
*/
public boolean isWrapperFor(Class wrappedType) {
if (!ServletRequest.class.isAssignableFrom(wrappedType)) {
throw new IllegalArgumentException("Given class " +
wrappedType.getName() + " not a subinterface of " +
ServletRequest.class.getName());
}
if (wrappedType.isAssignableFrom(request.getClass())) {
return true;
} else if (request instanceof ServletRequestWrapper) {
return ((ServletRequestWrapper) request).isWrapperFor(wrappedType);
} else {
return false;
}
}
/**
* Gets the dispatcher type of the wrapped request.
*
* @return the dispatcher type of the wrapped request
*
* @see ServletRequest#getDispatcherType
*
* @since Servlet 3.0
*/
public DispatcherType getDispatcherType() {
return request.getDispatcherType();
}
}
