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package javax.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Locale;
/**
*
* Provides a convenient implementation of the ServletResponse interface that
* can be subclassed by developers wishing to adapt the response from a Servlet.
* This class implements the Wrapper or Decorator pattern. Methods default to
* calling through to the wrapped response object.
*
* @author Various
* @since Servlet 2.3
*
* @see javax.servlet.ServletResponse
*/
public class ServletResponseWrapper implements ServletResponse {
private ServletResponse response;
/**
* Creates a ServletResponse adaptor wrapping the given response object.
* @throws java.lang.IllegalArgumentException if the response is null.
*/
public ServletResponseWrapper(ServletResponse response) {
if (response == null) {
throw new IllegalArgumentException("Response cannot be null");
}
this.response = response;
}
/**
* Return the wrapped ServletResponse object.
*/
public ServletResponse getResponse() {
return this.response;
}
/**
* Sets the response being wrapped.
* @throws java.lang.IllegalArgumentException if the response is null.
*/
public void setResponse(ServletResponse response) {
if (response == null) {
throw new IllegalArgumentException("Response cannot be null");
}
this.response = response;
}
/**
* The default behavior of this method is to call setCharacterEncoding(String charset)
* on the wrapped response object.
*
* @since Servlet 2.4
*/
public void setCharacterEncoding(String charset) {
this.response.setCharacterEncoding(charset);
}
/**
* The default behavior of this method is to return getCharacterEncoding()
* on the wrapped response object.
*/
public String getCharacterEncoding() {
return this.response.getCharacterEncoding();
}
/**
* The default behavior of this method is to return getOutputStream()
* on the wrapped response object.
*/
public ServletOutputStream getOutputStream() throws IOException {
return this.response.getOutputStream();
}
/**
* The default behavior of this method is to return getWriter()
* on the wrapped response object.
*/
public PrintWriter getWriter() throws IOException {
return this.response.getWriter();
}
/**
* The default behavior of this method is to call setContentLength(int len)
* on the wrapped response object.
*/
public void setContentLength(int len) {
this.response.setContentLength(len);
}
/**
* The default behavior of this method is to call setContentType(String type)
* on the wrapped response object.
*/
public void setContentType(String type) {
this.response.setContentType(type);
}
/**
* The default behavior of this method is to return getContentType()
* on the wrapped response object.
*
* @since Servlet 2.4
*/
public String getContentType() {
return this.response.getContentType();
}
/**
* The default behavior of this method is to call setBufferSize(int size)
* on the wrapped response object.
*/
public void setBufferSize(int size) {
this.response.setBufferSize(size);
}
/**
* The default behavior of this method is to return getBufferSize()
* on the wrapped response object.
*/
public int getBufferSize() {
return this.response.getBufferSize();
}
/**
* The default behavior of this method is to call flushBuffer()
* on the wrapped response object.
*/
public void flushBuffer() throws IOException {
this.response.flushBuffer();
}
/**
* The default behavior of this method is to return isCommitted()
* on the wrapped response object.
*/
public boolean isCommitted() {
return this.response.isCommitted();
}
/**
* The default behavior of this method is to call reset()
* on the wrapped response object.
*/
public void reset() {
this.response.reset();
}
/**
* The default behavior of this method is to call resetBuffer()
* on the wrapped response object.
*/
public void resetBuffer() {
this.response.resetBuffer();
}
/**
* The default behavior of this method is to call setLocale(Locale loc)
* on the wrapped response object.
*/
public void setLocale(Locale loc) {
this.response.setLocale(loc);
}
/**
* The default behavior of this method is to return getLocale()
* on the wrapped response object.
*/
public Locale getLocale() {
return this.response.getLocale();
}
/**
* Checks (recursively) if this ServletResponseWrapper wraps the given
* {@link ServletResponse} instance.
*
* @param wrapped the ServletResponse instance to search for
*
* @return true if this ServletResponseWrapper wraps the
* given ServletResponse instance, false otherwise
*
* @since Servlet 3.0
*/
public boolean isWrapperFor(ServletResponse wrapped) {
if (response == wrapped) {
return true;
} else if (response instanceof ServletResponseWrapper) {
return ((ServletResponseWrapper) response).isWrapperFor(wrapped);
} else {
return false;
}
}
/**
* Checks (recursively) if this ServletResponseWrapper wraps a
* {@link ServletResponse} of the given class type.
*
* @param wrappedType the ServletResponse class type to
* search for
*
* @return true if this ServletResponseWrapper wraps a
* ServletResponse of the given class type, false otherwise
*
* @throws IllegalArgumentException if the given class does not
* implement {@link ServletResponse}
*
* @since Servlet 3.0
*/
public boolean isWrapperFor(Class wrappedType) {
if (!ServletResponse.class.isAssignableFrom(wrappedType)) {
throw new IllegalArgumentException("Given class " +
wrappedType.getName() + " not a subinterface of " +
ServletResponse.class.getName());
}
if (wrappedType.isAssignableFrom(response.getClass())) {
return true;
} else if (response instanceof ServletResponseWrapper) {
return ((ServletResponseWrapper) response).isWrapperFor(wrappedType);
} else {
return false;
}
}
}