WebletsPhaseListener.java

/*
 * Copyright 2005 John R. Fallows
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.java.dev.weblets.impl.faces;

import net.java.dev.weblets.WebletContainer;
import net.java.dev.weblets.WebletRequest;
import net.java.dev.weblets.WebletResponse;
import net.java.dev.weblets.impl.WebletContainerImpl;
import net.java.dev.weblets.impl.misc.WebletUtilsImpl;
import net.java.dev.weblets.impl.servlets.WebletRequestImpl;
import net.java.dev.weblets.impl.servlets.WebletResponseImpl;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import javax.faces.FacesException;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.util.Date;
import java.util.Map;
import java.util.regex.Matcher;

public class WebletsPhaseListener implements PhaseListener {
	private static final String	WEBLETS_PHASE_LISTENER_ENTERED	= "net.java.dev.weblets.impl.faces.WebletsPhaseListener.entered";

	public void afterPhase(PhaseEvent event) {
	}

	public void beforePhase(PhaseEvent event) {
		// TODO check if not event.getPhaseId()!=PhaseId.RENDER_RESPONSE is the only one needed
		if (event.getPhaseId() != PhaseId.RESTORE_VIEW && event.getPhaseId() != PhaseId.APPLY_REQUEST_VALUES && event.getPhaseId() != PhaseId.RENDER_RESPONSE) {
			// try to execute the phase-listener logic only on apply request values
			// and (if restore-view is not called, e.g. in the portlet-case) on render-response
			return;
		}
		Boolean isReentry = (Boolean) event.getFacesContext().getExternalContext().getRequestMap().get(WEBLETS_PHASE_LISTENER_ENTERED);
		if (isReentry != Boolean.TRUE) {
			event.getFacesContext().getExternalContext().getRequestMap().put(WEBLETS_PHASE_LISTENER_ENTERED, Boolean.TRUE);
			doBeforePhase(event);
		}
	}

	protected void doBeforePhase(PhaseEvent event) {
		FacesContext context = FacesContext.getCurrentInstance();
		ExternalContext external = context.getExternalContext();
		// test stuff remove me once verified
		WebletUtilsImpl utils = new WebletUtilsImpl();
		WebletRequest req = null;
        
		/*
		 * req = utils.getRequestFromPath(external.getRequest(), "/weblets-demo/faces/weblets/demo$1.0/welcome.js");
		 * 
		 * ServletContext ctx = (ServletContext) external.getContext(); String mime = ctx.getMimeType("/faces/weblets/demo$1.0/welcome.js");
		 * 
		 * InputStream strm = utils.getResourceAsStream(req, mime); BufferedReader istrm = new BufferedReader(new InputStreamReader(strm)); try { String line =
		 * ""; while ((line = istrm.readLine() ) != null) { System.out.println(line); } istrm.close();
		 * 
		 * } catch (IOException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. }
		 * 
		 * 
		 * req = utils.getRequestFromPath(external.getRequest(), "/faces/weblets/demo$1.0/welcome.js"); utils.getResourceAsStream(req, mime);
		 * 
		 * req = utils.getRequestFromPath(external.getRequest(), "http://localhost:8080/weblets-demo/faces/weblets/demo$1.0/welcome.js");
		 * utils.getResourceAsStream(req, mime);
		 * 
		 * req = utils.getRequestFromPath(external.getRequest(), "/xxx/aa/demo$1.0/welcome.js"); utils.getResourceAsStream(req, mime);
		 * 
		 * 
		 * req = utils.getRequestFromPath(external.getRequest(), "/xxx/aa/demo$1.0/booga.js"); Object strobj = utils.getResourceAsStream(req, mime);
		 */
		WebletContainerImpl container = (WebletContainerImpl) WebletContainer.getInstance();
		String pathInfo = external.getRequestServletPath();
		if (pathInfo != null && external.getRequestPathInfo() != null)
			pathInfo += external.getRequestPathInfo();
		if (pathInfo == null && event.getPhaseId() == PhaseId.RESTORE_VIEW) {
			// we are in a portlet environment here, since we do not get an external path info
			// we skip this phase and renter after the restore view
			event.getFacesContext().getExternalContext().getRequestMap().put(WEBLETS_PHASE_LISTENER_ENTERED, Boolean.FALSE);
			return;
		}
		// special portlet treatment here
		// we move to later phases here to the apply request values
		// to become portlet compatible, unfortunately
		// we lose a little bit of performance then
		// but the determination of the pathInfo over
		// the view id is more neutral than over
		// the request servlet which is rundered null
		// in some portlet environments
		if (pathInfo == null)
			pathInfo = context.getViewRoot().getViewId();
		Matcher matcher = null;
		try {
			matcher = container.getPattern().matcher(pathInfo);
		} catch (NullPointerException ex) {
			Log log = LogFactory.getLog(this.getClass());
			log
					.error("An error has occurred no pattern or matcher has been detected, this is probably a sign that the weblets context listener has not been started. please add following lines to your web.xml \n"
							+ " <listener>\n" + "       <listener-class>net.java.dev.weblets.WebletsContextListener</listener-class>\n" + " </listener>");
			log.error("Details of the original Error:" + ex.toString());
			return;
		}
		if (matcher.matches()) {
			Map requestHeaders = external.getRequestHeaderMap();
			String contextPath = external.getRequestContextPath();
			String requestURI = matcher.group(1);
			String ifModifiedHeader = (String) requestHeaders.get("If-Modified-Since");
			long ifModifiedSince = -1L;
			if (ifModifiedHeader != null) {
				try {
					DateFormat rfc1123 = new HttpDateFormat();
					Date parsed = rfc1123.parse(ifModifiedHeader);
					ifModifiedSince = parsed.getTime();
				} catch (ParseException e) {
					throw new FacesException(e);
				}
			}
			try {
				String[] parsed = container.parseWebletRequest(contextPath, requestURI, ifModifiedSince);
				if (parsed != null) {
					ServletContext servletContext = (ServletContext) external.getContext();
					ServletRequest httpRequest = (ServletRequest) external.getRequest();
					ServletResponse httpResponse = (ServletResponse) external.getResponse();
					String webletName = parsed[0];
					String webletPath = parsed[1];
					String webletPathInfo = parsed[2];
					WebletRequest webRequest = new WebletRequestImpl(webletName, webletPath, contextPath, webletPathInfo, ifModifiedSince, httpRequest);
					String contentName = webRequest.getPathInfo();
					String contentTypeDefault = servletContext.getMimeType(contentName);
					WebletResponse webResponse = new WebletResponseImpl(contentTypeDefault, httpResponse);
					container.service(webRequest, webResponse);
					context.responseComplete();
				}
			} catch (IOException e) {
				throw new FacesException(e);
			}
		}
	}

	public PhaseId getPhaseId() {
		/*
		 * we can only trigger after the restore view due to the fact that the view root is only available then
		 */
		return PhaseId.ANY_PHASE;
	}

	/**
	 * The serialization version.
	 */
	private static final long	serialVersionUID	= -8385571916376473831L;
}