org.argeo.cms.ui/src/org/argeo/cms/script/Theme.java

   1 package org.argeo.cms.script;
   2
   3 import static java.nio.charset.StandardCharsets.UTF_8;
   4
   5 import java.io.BufferedReader;
   6 import java.io.IOException;
   7 import java.io.InputStreamReader;
   8 import java.net.URL;
   9 import java.util.ArrayList;
  10 import java.util.Enumeration;
  11 import java.util.HashMap;
  12 import java.util.List;
  13 import java.util.Map;
  14 import java.util.stream.Collectors;
  15
  16 import org.apache.commons.logging.Log;
  17 import org.apache.commons.logging.LogFactory;
  18 import org.argeo.cms.CmsException;
  19 import org.argeo.cms.util.BundleResourceLoader;
  20 import org.argeo.cms.util.ThemeUtils;
  21 import org.eclipse.rap.rwt.application.Application;
  22 import org.eclipse.rap.rwt.service.ResourceLoader;
  23 import org.osgi.framework.Bundle;
  24 import org.osgi.framework.BundleContext;
  25
  26 public class Theme {
  27         private final static Log log = LogFactory.getLog(Theme.class);
  28
  29         private String themeId;
  30         private Map<String, ResourceLoader> css = new HashMap<>();
  31         private Map<String, ResourceLoader> resources = new HashMap<>();
  32
  33         private String headerCss;
  34         private List<String> fonts = new ArrayList<>();
  35
  36         public Theme(BundleContext bundleContext, String symbolicName) {
  37                 this.themeId = symbolicName;
  38                 Bundle themeBundle = ThemeUtils.findThemeBundle(bundleContext, symbolicName);
  39                 addStyleSheets(themeBundle, new BundleResourceLoader(themeBundle));
  40                 BundleResourceLoader themeBRL = new BundleResourceLoader(themeBundle);
  41                 addResources(themeBRL, "*.png");
  42                 addResources(themeBRL, "*.gif");
  43                 addResources(themeBRL, "*.jpg");
  44                 addResources(themeBRL, "*.jpeg");
  45                 addResources(themeBRL, "*.svg");
  46                 addResources(themeBRL, "*.ico");
  47
  48                 // fonts
  49                 URL fontsUrl = themeBundle.getEntry("fonts.txt");
  50                 if (fontsUrl != null) {
  51                         loadFontsUrl(fontsUrl);
  52                 }
  53
  54                 // common CSS header (plain CSS)
  55                 URL headerCssUrl = themeBundle.getEntry("header.css");
  56                 if (headerCssUrl != null) {
  57                         try (BufferedReader buffer = new BufferedReader(new InputStreamReader(headerCssUrl.openStream(), UTF_8))) {
  58                                 headerCss = buffer.lines().collect(Collectors.joining("\n"));
  59                         } catch (IOException e) {
  60                                 throw new CmsException("Cannot read " + headerCssUrl, e);
  61                         }
  62                 }
  63
  64         }
  65
  66         public void apply(Application application) {
  67                 for (String name : resources.keySet()) {
  68                         application.addResource(name, resources.get(name));
  69                 }
  70                 for (String name : css.keySet()) {
  71                         application.addStyleSheet(themeId, name, css.get(name));
  72                 }
  73         }
  74
  75         public String getAdditionalHeaders() {
  76                 StringBuilder sb = new StringBuilder();
  77                 if (headerCss != null) {
  78                         sb.append("<style type='text/css'>\n");
  79                         sb.append(headerCss);
  80                         sb.append("\n</style>\n");
  81                 }
  82                 for (String link : fonts) {
  83                         sb.append("<link rel='stylesheet' href='");
  84                         sb.append(link);
  85                         sb.append("'/>\n");
  86                 }
  87                 if (sb.length() == 0)
  88                         return null;
  89                 else
  90                         return sb.toString();
  91         }
  92
  93         void addStyleSheets(Bundle themeBundle, ResourceLoader ssRL) {
  94                 Enumeration<URL> themeResources = themeBundle.findEntries("/rap", "*.css", true);
  95                 if (themeResources == null)
  96                         return;
  97                 while (themeResources.hasMoreElements()) {
  98                         String resource = themeResources.nextElement().getPath();
  99                         // remove first '/' so that RWT registers it
 100                         resource = resource.substring(1);
 101                         if (!resource.endsWith("/")) {
 102                                 if (css.containsKey(resource))
 103                                         log.warn("Overriding " + resource + " from " + themeBundle.getSymbolicName());
 104                                 css.put(resource, ssRL);
 105                         }
 106
 107                 }
 108
 109         }
 110
 111         void loadFontsUrl(URL url) {
 112                 try (BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(), UTF_8))) {
 113                         String line = null;
 114                         while ((line = in.readLine()) != null) {
 115                                 line = line.trim();
 116                                 if (!line.equals("") && !line.startsWith("#")) {
 117                                         fonts.add(line);
 118                                 }
 119                         }
 120                 } catch (IOException e) {
 121                         throw new CmsException("Cannot load URL " + url, e);
 122                 }
 123         }
 124
 125         void addResources(BundleResourceLoader themeBRL, String pattern) {
 126                 Bundle themeBundle = themeBRL.getBundle();
 127                 Enumeration<URL> themeResources = themeBundle.findEntries("/", pattern, true);
 128                 if (themeResources == null)
 129                         return;
 130                 while (themeResources.hasMoreElements()) {
 131                         String resource = themeResources.nextElement().getPath();
 132                         // remove first '/' so that RWT registers it
 133                         resource = resource.substring(1);
 134                         if (!resource.endsWith("/")) {
 135                                 if (resources.containsKey(resource))
 136                                         log.warn("Overriding " + resource + " from " + themeBundle.getSymbolicName());
 137                                 resources.put(resource, themeBRL);
 138                         }
 139
 140                 }
 141
 142         }
 143
 144         public String getThemeId() {
 145                 return themeId;
 146         }
 147
 148 }