package org.g4studio.core.mvc.xstruts.chain.commands.servlet;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.g4studio.core.mvc.xstruts.action.ActionServlet;
import org.g4studio.core.mvc.xstruts.chain.commands.AbstractPerformForward;
import org.g4studio.core.mvc.xstruts.chain.contexts.ActionContext;
import org.g4studio.core.mvc.xstruts.chain.contexts.ServletActionContext;
import org.g4studio.core.mvc.xstruts.config.ForwardConfig;
import org.g4studio.core.mvc.xstruts.config.ModuleConfig;
import org.g4studio.core.mvc.xstruts.util.MessageResources;
import org.g4studio.core.mvc.xstruts.util.ModuleUtils;
import org.g4studio.core.mvc.xstruts.util.RequestUtils;
/**
* <p>
* Perform forwarding or redirection based on the specified
* <code>ForwardConfig</code> (if any).
* </p>
*
* @version $Rev: 421119 $ $Date: 2006-07-11 21:49:11 -0700 (Tue, 11 Jul 2006) $
*/
public class PerformForward extends AbstractPerformForward {
private static final Log LOG = LogFactory.getLog(PerformForward.class);
// ------------------------------------------------------- Protected Methods
/**
* <p>
* Perform the appropriate processing on the specified
* <code>ForwardConfig</code>.
* </p>
*
* @param context
* The context for this request
* @param forwardConfig
* The forward to be performed
*/
protected void perform(ActionContext context, ForwardConfig forwardConfig) throws Exception {
ServletActionContext sacontext = (ServletActionContext) context;
String uri = forwardConfig.getPath();
if (uri == null) {
ActionServlet servlet = sacontext.getActionServlet();
MessageResources resources = servlet.getInternal();
throw new IllegalArgumentException(resources.getMessage("forwardPathNull"));
}
HttpServletRequest request = sacontext.getRequest();
ServletContext servletContext = sacontext.getContext();
HttpServletResponse response = sacontext.getResponse();
if (uri.startsWith("/")) {
uri = resolveModuleRelativePath(forwardConfig, servletContext, request);
}
if (response.isCommitted() && !forwardConfig.getRedirect()) {
handleAsInclude(uri, servletContext, request, response);
} else if (forwardConfig.getRedirect()) {
handleAsRedirect(uri, request, response);
} else {
handleAsForward(uri, servletContext, request, response);
}
}
private String resolveModuleRelativePath(ForwardConfig forwardConfig, ServletContext servletContext,
HttpServletRequest request) {
String prefix = forwardConfig.getModule();
ModuleConfig moduleConfig = ModuleUtils.getInstance().getModuleConfig(prefix, request, servletContext);
return RequestUtils.forwardURL(request, forwardConfig, moduleConfig);
}
private void handleAsForward(String uri, ServletContext servletContext, HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
RequestDispatcher rd = servletContext.getRequestDispatcher(uri);
if (LOG.isDebugEnabled()) {
LOG.debug("Forwarding to " + uri);
}
rd.forward(request, response);
}
private void handleAsRedirect(String uri, HttpServletRequest request, HttpServletResponse response)
throws IOException {
if (uri.startsWith("/")) {
uri = request.getContextPath() + uri;
}
if (LOG.isDebugEnabled()) {
LOG.debug("Redirecting to " + uri);
}
response.sendRedirect(response.encodeRedirectURL(uri));
}
private void handleAsInclude(String uri, ServletContext servletContext, HttpServletRequest request,
HttpServletResponse response) throws IOException, ServletException {
RequestDispatcher rd = servletContext.getRequestDispatcher(uri);
if (rd == null) {
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Error getting RequestDispatcher for "
+ uri);
return;
}
if (LOG.isDebugEnabled()) {
LOG.debug("Including " + uri);
}
rd.include(request, response);
}
}