| /******************************************************************************* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.ofbiz.widget.screen; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.io.StringReader; |
| import java.io.StringWriter; |
| import java.io.Writer; |
| |
| import javax.servlet.ServletContext; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import javax.xml.transform.stream.StreamSource; |
| |
| import org.apache.fop.apps.Fop; |
| import org.ofbiz.base.util.Debug; |
| import org.ofbiz.base.util.UtilCodec; |
| import org.ofbiz.base.util.UtilProperties; |
| import org.ofbiz.base.util.UtilValidate; |
| import org.ofbiz.entity.Delegator; |
| import org.ofbiz.entity.util.EntityUtilProperties; |
| import org.ofbiz.webapp.view.AbstractViewHandler; |
| import org.ofbiz.webapp.view.ApacheFopWorker; |
| import org.ofbiz.webapp.view.ViewHandlerException; |
| import org.ofbiz.widget.form.FormStringRenderer; |
| import org.ofbiz.widget.form.MacroFormRenderer; |
| import org.ofbiz.widget.html.HtmlScreenRenderer; |
| |
| /** |
| * Uses XSL-FO formatted templates to generate PDF, PCL, POSTSCRIPT etc. views |
| * This handler will use JPublish to generate the XSL-FO |
| */ |
| public class ScreenFopViewHandler extends AbstractViewHandler { |
| public static final String module = ScreenFopViewHandler.class.getName(); |
| protected static final String DEFAULT_ERROR_TEMPLATE = "component://common/widget/CommonScreens.xml#FoError"; |
| |
| protected ServletContext servletContext = null; |
| |
| /** |
| * @see org.ofbiz.webapp.view.ViewHandler#init(javax.servlet.ServletContext) |
| */ |
| @Override |
| public void init(ServletContext context) throws ViewHandlerException { |
| this.servletContext = context; |
| } |
| |
| /** |
| * @see org.ofbiz.webapp.view.ViewHandler#render(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) |
| */ |
| @Override |
| public void render(String name, String page, String info, String contentType, String encoding, HttpServletRequest request, HttpServletResponse response) throws ViewHandlerException { |
| |
| Delegator delegator = (Delegator) request.getAttribute("delegator"); |
| // render and obtain the XSL-FO |
| Writer writer = new StringWriter(); |
| try { |
| ScreenStringRenderer screenStringRenderer = new MacroScreenRenderer(EntityUtilProperties.getPropertyValue("widget", getName() + ".name", delegator), EntityUtilProperties.getPropertyValue("widget", getName() + ".screenrenderer", delegator)); |
| FormStringRenderer formStringRenderer = new MacroFormRenderer(EntityUtilProperties.getPropertyValue("widget", getName() + ".formrenderer", delegator), request, response); |
| // TODO: uncomment these lines when the renderers are implemented |
| //TreeStringRenderer treeStringRenderer = new MacroTreeRenderer(UtilProperties.getPropertyValue("widget", getName() + ".treerenderer"), writer); |
| //MenuStringRenderer menuStringRenderer = new MacroMenuRenderer(UtilProperties.getPropertyValue("widget", getName() + ".menurenderer"), writer); |
| ScreenRenderer screens = new ScreenRenderer(writer, null, screenStringRenderer); |
| screens.populateContextForRequest(request, response, servletContext); |
| |
| // this is the object used to render forms from their definitions |
| screens.getContext().put("formStringRenderer", formStringRenderer); |
| screens.getContext().put("simpleEncoder", UtilCodec.getEncoder(EntityUtilProperties.getPropertyValue("widget", getName() + ".encoder", delegator))); |
| screens.render(page); |
| } catch (Exception e) { |
| renderError("Problems with the response writer/output stream", e, "[Not Yet Rendered]", request, response); |
| return; |
| } |
| |
| // set the input source (XSL-FO) and generate the output stream of contentType |
| String screenOutString = writer.toString(); |
| if (!screenOutString.startsWith("<?xml")) { |
| screenOutString = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + screenOutString; |
| } |
| if (Debug.verboseOn()) Debug.logVerbose("XSL:FO Screen Output: " + screenOutString, module); |
| |
| if (UtilValidate.isEmpty(contentType)) { |
| contentType = UtilProperties.getPropertyValue("widget", getName() + ".default.contenttype"); |
| } |
| Reader reader = new StringReader(screenOutString); |
| StreamSource src = new StreamSource(reader); |
| ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| try { |
| Fop fop = ApacheFopWorker.createFopInstance(out, contentType); |
| ApacheFopWorker.transform(src, null, fop); |
| } catch (Exception e) { |
| renderError("Unable to transform FO file", e, screenOutString, request, response); |
| return; |
| } |
| // set the content type and length |
| response.setContentType(contentType); |
| response.setContentLength(out.size()); |
| |
| // write to the browser |
| try { |
| out.writeTo(response.getOutputStream()); |
| response.getOutputStream().flush(); |
| } catch (IOException e) { |
| renderError("Unable to write to OutputStream", e, screenOutString, request, response); |
| } |
| } |
| |
| protected void renderError(String msg, Exception e, String screenOutString, HttpServletRequest request, HttpServletResponse response) throws ViewHandlerException { |
| Debug.logError(msg + ": " + e + "; Screen XSL:FO text was:\n" + screenOutString, module); |
| try { |
| Writer writer = new StringWriter(); |
| ScreenRenderer screens = new ScreenRenderer(writer, null, new HtmlScreenRenderer()); |
| screens.populateContextForRequest(request, response, servletContext); |
| screens.getContext().put("errorMessage", msg + ": " + e); |
| screens.render(DEFAULT_ERROR_TEMPLATE); |
| response.setContentType("text/html"); |
| response.getWriter().write(writer.toString()); |
| writer.close(); |
| } catch (Exception x) { |
| Debug.logError("Multiple errors rendering FOP", module); |
| throw new ViewHandlerException("Multiple errors rendering FOP", x); |
| } |
| } |
| } |