runtime/org.argeo.slc.support.osgi/src/main/java/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.apache.commons.logging.Log;
   7 import org.apache.commons.logging.LogFactory;
   8 import org.argeo.slc.SlcException;
   9 import org.argeo.slc.core.execution.FileExecutionResources;
  10 import org.osgi.framework.BundleContext;
  11 import org.springframework.core.io.Resource;
  12 import org.springframework.osgi.context.BundleContextAware;
  13 import org.springframework.osgi.io.OsgiBundleResource;
  14
  15 public class OsgiExecutionResources extends FileExecutionResources implements
  16                 BundleContextAware {
  17         private final static Log log = LogFactory
  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 = System.getProperty("osgi.framework").substring(
  52                                         "file:".length());
  53                         int sepIndex = framework.lastIndexOf(File.separatorChar);
  54                         framework = framework.substring(0, sepIndex);
  55                         base = framework + '/' + relPath;
  56                 } else {
  57                         return null;
  58                 }
  59
  60                 String path = base + '/' + osgiBundleResource.getPathWithinContext();
  61                 try {
  62                         file = new File(path).getCanonicalFile();
  63                 } catch (IOException e) {
  64                         throw new SlcException("Cannot determine canonical path for "
  65                                         + path, e);
  66                 }
  67                 if (log.isTraceEnabled())
  68                         log.debug("OSGi local resource: " + file + " from " + resource);
  69                 return file;
  70         }
  71
  72         public void setBundleContext(BundleContext bundleContext) {
  73                 this.bundleContext = bundleContext;
  74         }
  75
  76 }