package org.rendersnake.ext.spring;
import java.util.Enumeration;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.rendersnake.HtmlCanvas;
import org.rendersnake.PageContext;
import org.rendersnake.ext.servlet.RequestHeadersMap;
import org.rendersnake.ext.servlet.RequestParametersMap;
import org.rendersnake.ext.servlet.SessionAttributesMap;
import org.rendersnake.internal.SimpleContextMap;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebArgumentResolver;
import org.springframework.web.context.request.NativeWebRequest;
/**
* HtmlCanvasArgumentResolver is a Spring Helper that is used
* to prepare html arguments before invoking a Controller method.
* <p><pre>
* {@code
* <!-- This Resolver exists for renderSnake HtmlCanvas parameter processing -->
* <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
* <property name="customArgumentResolver">
* <bean class="org.rendersnake.ext.spring.HtmlCanvasArgumentResolver">
* </bean>
* </property>
* </bean>}
* </pre></p>
* @author e.micklei
**/
public class HtmlCanvasArgumentResolver implements WebArgumentResolver {
/* (non-Javadoc)
* @see org.springframework.web.bind.support.WebArgumentResolver#resolveArgument(org.springframework.core.MethodParameter, org.springframework.web.context.request.NativeWebRequest)
*/
public Object resolveArgument(MethodParameter methodParameter,
NativeWebRequest webRequest) throws Exception {
// only accept HtmlCanvas typed parameter
if (methodParameter.getParameterType() != HtmlCanvas.class)
return UNRESOLVED;
HttpServletRequest request = (HttpServletRequest)(webRequest.getNativeRequest());
HttpServletResponse response = (HttpServletResponse)(webRequest.getNativeResponse());
response.setContentType("text/html"); // controllers may override this
final HtmlCanvas canvas = HtmlCanvasFactory.createCanvas(request,response,response.getWriter());
setupPageContext(request, canvas.getPageContext());
return canvas;
}
static void setupPageContext(HttpServletRequest request, PageContext context) {
String q = request.getQueryString();
context.withObject(PageContext.REQUEST_PATH, request.getPathTranslated());
context.withObject(PageContext.REQUEST_URIQ, request.getRequestURI() + (q == null ? "" : "?" + q));
context.withObject(PageContext.SESSION, new SessionAttributesMap(request));
context.withObject(PageContext.REQUEST_PARAMETERS, new RequestParametersMap(request));
context.withObject(PageContext.REQUEST_HEADERS, new RequestHeadersMap(request));
}
}