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.RWT;
  22 import org.eclipse.rap.rwt.application.Application;
  23 import org.eclipse.rap.rwt.service.ResourceLoader;
  24 import org.osgi.framework.Bundle;
  25 import org.osgi.framework.BundleContext;
  26
  27 public class Theme {
  28         private final static Log log = LogFactory.getLog(Theme.class);
  29
  30         private String themeId;
  31         private Map<String, ResourceLoader> css = new HashMap<>();
  32         private Map<String, ResourceLoader> resources = new HashMap<>();
  33
  34         private String headerCss;
  35         private List<String> fonts = new ArrayList<>();
  36
  37         private String basePath;
  38         private String cssPath;
  39
  40         public Theme(BundleContext bundleContext) {
  41                 this(bundleContext, null);
  42         }
  43
  44         public Theme(BundleContext bundleContext, String symbolicName) {
  45                 Bundle themeBundle;
  46                 if (symbolicName == null) {
  47                         themeBundle = bundleContext.getBundle();
  48 //                      basePath = "/theme/";
  49 //                      cssPath = basePath;
  50                 } else {
  51                         themeBundle = ThemeUtils.findThemeBundle(bundleContext, symbolicName);
  52                 }
  53                 basePath = "/";
  54                 cssPath = "/rap/";
  55                 this.themeId = RWT.DEFAULT_THEME_ID;
  56                 addStyleSheets(themeBundle, new BundleResourceLoader(themeBundle));
  57                 BundleResourceLoader themeBRL = new BundleResourceLoader(themeBundle);
  58                 addResources(themeBRL, "*.png");
  59                 addResources(themeBRL, "*.gif");
  60                 addResources(themeBRL, "*.jpg");
  61                 addResources(themeBRL, "*.jpeg");
  62                 addResources(themeBRL, "*.svg");
  63                 addResources(themeBRL, "*.ico");
  64
  65                 // fonts
  66                 URL fontsUrl = themeBundle.getEntry(basePath + "fonts.txt");
  67                 if (fontsUrl != null) {
  68                         loadFontsUrl(fontsUrl);
  69                 }
  70
  71                 // common CSS header (plain CSS)
  72                 URL headerCssUrl = themeBundle.getEntry(basePath + "header.css");
  73                 if (headerCssUrl != null) {
  74                         try (BufferedReader buffer = new BufferedReader(new InputStreamReader(headerCssUrl.openStream(), UTF_8))) {
  75                                 headerCss = buffer.lines().collect(Collectors.joining("\n"));
  76                         } catch (IOException e) {
  77                                 throw new CmsException("Cannot read " + headerCssUrl, e);
  78                         }
  79                 }
  80
  81         }
  82
  83         public void apply(Application application) {
  84                 for (String name : resources.keySet()) {
  85                         application.addResource(name, resources.get(name));
  86                         if (log.isDebugEnabled())
  87                                 log.debug("Added resource " + name);
  88                 }
  89                 for (String name : css.keySet()) {
  90                         application.addStyleSheet(themeId, name, css.get(name));
  91                         if (log.isDebugEnabled())
  92                                 log.debug("Added RAP CSS " + name);
  93                 }
  94         }
  95
  96         public String getAdditionalHeaders() {
  97                 StringBuilder sb = new StringBuilder();
  98                 if (headerCss != null) {
  99                         sb.append("<style type='text/css'>\n");
 100                         sb.append(headerCss);
 101                         sb.append("\n</style>\n");
 102                 }
 103                 for (String link : fonts) {
 104                         sb.append("<link rel='stylesheet' href='");
 105                         sb.append(link);
 106                         sb.append("'/>\n");
 107                 }
 108                 if (sb.length() == 0)
 109                         return null;
 110                 else
 111                         return sb.toString();
 112         }
 113
 114         void addStyleSheets(Bundle themeBundle, ResourceLoader ssRL) {
 115                 Enumeration<URL> themeResources = themeBundle.findEntries(cssPath, "*.css", true);
 116                 if (themeResources == null)
 117                         return;
 118                 while (themeResources.hasMoreElements()) {
 119                         String resource = themeResources.nextElement().getPath();
 120                         // remove first '/' so that RWT registers it
 121                         resource = resource.substring(1);
 122                         if (!resource.endsWith("/")) {
 123                                 if (css.containsKey(resource))
 124                                         log.warn("Overriding " + resource + " from " + themeBundle.getSymbolicName());
 125                                 css.put(resource, ssRL);
 126                         }
 127
 128                 }
 129
 130         }
 131
 132         void loadFontsUrl(URL url) {
 133                 try (BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(), UTF_8))) {
 134                         String line = null;
 135                         while ((line = in.readLine()) != null) {
 136                                 line = line.trim();
 137                                 if (!line.equals("") && !line.startsWith("#")) {
 138                                         fonts.add(line);
 139                                 }
 140                         }
 141                 } catch (IOException e) {
 142                         throw new CmsException("Cannot load URL " + url, e);
 143                 }
 144         }
 145
 146         void addResources(BundleResourceLoader themeBRL, String pattern) {
 147                 Bundle themeBundle = themeBRL.getBundle();
 148                 Enumeration<URL> themeResources = themeBundle.findEntries(basePath, pattern, true);
 149                 if (themeResources == null)
 150                         return;
 151                 while (themeResources.hasMoreElements()) {
 152                         String resource = themeResources.nextElement().getPath();
 153                         // remove first '/' so that RWT registers it
 154                         resource = resource.substring(1);
 155                         if (!resource.endsWith("/")) {
 156                                 if (resources.containsKey(resource))
 157                                         log.warn("Overriding " + resource + " from " + themeBundle.getSymbolicName());
 158                                 resources.put(resource, themeBRL);
 159                         }
 160
 161                 }
 162
 163         }
 164
 165         public String getThemeId() {
 166                 return themeId;
 167         }
 168
 169         public void setThemeId(String themeId) {
 170                 this.themeId = themeId;
 171         }
 172
 173         public String getBasePath() {
 174                 return basePath;
 175         }
 176
 177         public void setBasePath(String basePath) {
 178                 this.basePath = basePath;
 179         }
 180
 181         public String getCssPath() {
 182                 return cssPath;
 183         }
 184
 185         public void setCssPath(String cssPath) {
 186                 this.cssPath = cssPath;
 187         }
 188
 189 }