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