legacy/org.argeo.slc.spring/src/org/argeo/slc/osgi/OsgiExecutionResources.java

   1 package org.argeo.slc.osgi;
   2
   3 import java.io.File;
   4 import java.io.IOException;
   5
   6 import org.argeo.api.cms.CmsLog;
   7 import org.argeo.slc.SlcException;
   8 import org.argeo.slc.core.execution.FileExecutionResources;
   9 import org.eclipse.gemini.blueprint.context.BundleContextAware;
  10 import org.eclipse.gemini.blueprint.io.OsgiBundleResource;
  11 import org.osgi.framework.BundleContext;
  12 import org.springframework.core.io.Resource;
  13
  14 /** Write access to resources in an OSGi context */
  15 public class OsgiExecutionResources extends FileExecutionResources implements
  16                 BundleContextAware {
  17         private final static CmsLog log = CmsLog
  18                         .getLog(OsgiExecutionResources.class);
  19
  20         private BundleContext bundleContext;
  21
  22         @Override
  23         protected File fileFromResource(Resource resource) {
  24                 File file = super.fileFromResource(resource);
  25                 if (file != null)
  26                         return file;
  27
  28                 if (!(resource instanceof OsgiBundleResource))
  29                         return null;
  30
  31                 OsgiBundleResource osgiBundleResource = (OsgiBundleResource) resource;
  32                 try {
  33                         return osgiBundleResource.getFile();
  34                 } catch (IOException e) {
  35                         if (log.isTraceEnabled())
  36                                 log.trace("Resource " + resource
  37                                                 + " is not available on the file system: " + e);
  38                 }
  39
  40                 // TODO: ability to access resources in other bundles
  41                 String location = bundleContext.getBundle().getLocation();
  42                 String base = null;
  43                 if (location.startsWith("reference:file:"))
  44                         base = location.substring("reference:file:".length());
  45                 else if (location.startsWith("initial@reference:file:")) {
  46                         // TODO: Equinox specific?
  47                         String relPath = location.substring("initial@reference:file:"
  48                                         .length());
  49                         // if (relPath.startsWith("../"))// relative to the framework jar
  50                         // relPath = relPath.substring("../".length());
  51                         // String framework =
  52                         // System.getProperty("osgi.framework").substring(
  53                         // "file:".length());
  54                         // log.debug(framework);
  55                         String installArea = System.getProperty("osgi.install.area")
  56                                         .substring("file:".length());
  57                         // log.debug(installArea);
  58                         base = installArea + '/' + relPath;
  59                         // int sepIndex = framework.lastIndexOf(File.separatorChar);
  60                         // framework = framework.substring(0, sepIndex);
  61                         // base = framework + '/' + relPath;
  62                 } else {
  63                         return null;
  64                 }
  65
  66                 String path = base + '/' + osgiBundleResource.getPathWithinContext();
  67                 try {
  68                         file = new File(path).getCanonicalFile();
  69                 } catch (IOException e) {
  70                         throw new SlcException("Cannot determine canonical path for "
  71                                         + path, e);
  72                 }
  73
  74                 if (!file.exists())
  75                         throw new SlcException(file
  76                                         + " was retrieved in bundle located at '" + location
  77                                         + "' for resource " + resource + " but it does not exist");
  78
  79                 if (log.isTraceEnabled())
  80                         log.debug("OSGi local resource: " + file + " from " + resource);
  81                 return file;
  82         }
  83
  84         public void setBundleContext(BundleContext bundleContext) {
  85                 this.bundleContext = bundleContext;
  86         }
  87
  88 }