| commit | author | age | ||
| 3ff4c5 | 1 | /* |
| U | 2 | neon-template - Template extensions to Neon |
| 3 | Copyright (C) 2024 Ulrich Hilger | |
| 4 | ||
| 5 | This program is free software: you can redistribute it and/or modify | |
| 6 | it under the terms of the GNU Affero General Public License as | |
| 7 | published by the Free Software Foundation, either version 3 of the | |
| 8 | License, or (at your option) any later version. | |
| 9 | ||
| 10 | This program is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | GNU Affero General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Affero General Public License | |
| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. | |
| 17 | */ | |
| 18 | package de.uhilger.neon.template; | |
| 19 | ||
| 20 | import com.github.mustachejava.Mustache; | |
| 21 | import com.github.mustachejava.MustacheFactory; | |
| 22 | import com.sun.net.httpserver.HttpExchange; | |
| 23 | import de.uhilger.neon.FileServer; | |
| 24 | import java.io.File; | |
| 25 | import java.io.IOException; | |
| 26 | import java.io.StringWriter; | |
| 27 | import java.util.Map; | |
| 28 | ||
| 29 | /** | |
| 30 | * Der TemplateWorker rendert den Inhalt einer Map in | |
| 31 | * ein Mustache-Template und gibt das Ergebnis zurueck. | |
| 32 | * | |
| 33 | * @author Ulrich Hilger | |
| 34 | * @version 1, 04.07.2021 | |
| 35 | */ | |
| 36 | public class TemplateWorker { | |
| 37 | ||
| 38 | //public static final String STR_DOT = "."; | |
| 39 | //public static final String STR_SLASH = "/"; | |
| 40 | ||
| 41 | //public static final String ATTR_TEMPLATE = "template"; | |
| 42 | ||
| 43 | //public static final String WELCOME_FILE = "index.htmi"; | |
| 44 | ||
| 45 | /** | |
| 46 | * Eine HTTP-Anfrage bearbeiten | |
| 47 | * | |
| 48 | * Erfordert den Namen des Templates im Attribut TemplateActor.ATTR_TEMPLATE | |
| 49 | * | |
| 50 | * Wenn im HttpContext das Attribut FileHandler.ATTR_FILE_BASE vorhanden ist, | |
| 51 | * wird dessen Inhalt als Basis-Ordner für das zu verwendende Template genutzt. | |
| 52 | * Anderenfalls wird das Template im Classpath gesucht. | |
| 53 | * | |
| 54 | * @param exchange die Anfrage und -Antwort-Infos der HTTP-Anfrage | |
| 55 | * @param data die Map mit den variablen Inhalten des Templates | |
| 56 | * @param template Dateiname der Vorlage relative zum Ablageort laut HttpContext-Attribut fileBase | |
| 57 | * @return das ausgefuellte Template | |
| 58 | * @throws IOException | |
| 59 | */ | |
| 60 | public String render(HttpExchange exchange, Object data, String template) throws IOException { | |
| 61 | MustacheFactory mf; | |
| 62 | Mustache m; | |
| 63 | //HttpHelper helper = new HttpHelper(); | |
| 64 | Map attributes = exchange.getHttpContext().getAttributes(); | |
| 65 | String fileBase = (String) attributes | |
| 66 | .getOrDefault(FileServer.ATTR_FILE_BASE, FileServer.STR_EMPTY); | |
| 67 | File fileRoot = new File(fileBase); | |
| 68 | //logger.fine("fileRoot: " + fileRoot.getAbsolutePath()); | |
| 69 | //String template = helper.getAttrStr(attributes, ATTR_TEMPLATE, STR_EMPTY); | |
| 70 | File templateFile = new File(fileRoot, template); | |
| 71 | if(templateFile.exists()) { | |
| 72 | //logger.fine("using template " + templateFile.getAbsolutePath()); | |
| 73 | mf = new NeonMustacheFactory(fileRoot); | |
| 74 | m = mf.compile(template); | |
| 75 | } else { | |
| 76 | //logger.fine("template " + templateFile.getAbsolutePath() + " not found"); | |
| 77 | mf = new NeonMustacheFactory(); | |
| 78 | m = mf.compile(template); | |
| 79 | } | |
| 80 | StringWriter writer = new StringWriter(); | |
| 81 | m.execute(writer, data).flush(); | |
| 82 | return writer.toString(); | |
| 83 | } | |
| 84 | ||
| 85 | } | |
