StyleSheetResourceLoader.java

   1 package org.argeo.cms.util;
   2
   3 import java.io.ByteArrayInputStream;
   4 import java.io.ByteArrayOutputStream;
   5 import java.io.IOException;
   6 import java.io.InputStream;
   7 import java.net.URL;
   8 import java.util.LinkedHashMap;
   9 import java.util.Map;
  10
  11 import org.apache.commons.io.IOUtils;
  12 import org.argeo.cms.CmsException;
  13 import org.eclipse.rap.rwt.service.ResourceLoader;
  14 import org.osgi.framework.Bundle;
  15 import org.osgi.framework.BundleContext;
  16
  17 /** {@link ResourceLoader} caching stylesheets. */
  18 public class StyleSheetResourceLoader implements ResourceLoader {
  19         private final BundleContext bundleContext;
  20
  21         private Map<String, StyleSheet> stylesheets = new LinkedHashMap<String, StyleSheet>();
  22
  23         public StyleSheetResourceLoader(BundleContext bundleContext) {
  24                 this.bundleContext = bundleContext;
  25         }
  26
  27         @Override
  28         public InputStream getResourceAsStream(String resourceName)
  29                         throws IOException {
  30                 if (!stylesheets.containsKey(resourceName)) {
  31                         // TODO deal with other bundles
  32                         Bundle bundle = bundleContext.getBundle();
  33                         // String location =
  34                         // bundle.getLocation().substring("initial@reference:".length());
  35                         // if (location.startsWith("file:")) {
  36                         // Path path = null;
  37                         // try {
  38                         // path = Paths.get(new URI(location));
  39                         // } catch (URISyntaxException e) {
  40                         // e.printStackTrace();
  41                         // }
  42                         // if (path != null) {
  43                         // Path resourcePath = path.resolve(resourceName);
  44                         // if (Files.exists(resourcePath))
  45                         // return Files.newInputStream(resourcePath);
  46                         // }
  47                         // }
  48                         URL res = bundle.getResource(resourceName);
  49                         if (res == null)
  50                                 throw new CmsException("Resource " + resourceName
  51                                                 + " not found in bundle " + bundle.getSymbolicName());
  52                         ByteArrayOutputStream out = new ByteArrayOutputStream();
  53                         IOUtils.copy(res.openStream(), out);
  54                         stylesheets.put(resourceName, new StyleSheet(out.toByteArray()));
  55                 }
  56                 return new ByteArrayInputStream(stylesheets.get(resourceName).getData());
  57                 // return res.openStream();
  58         }
  59
  60         private class StyleSheet {
  61                 private byte[] data;
  62
  63                 public StyleSheet(byte[] data) {
  64                         super();
  65                         this.data = data;
  66                 }
  67
  68                 public byte[] getData() {
  69                         return data;
  70                 }
  71
  72         }
  73 }