org.argeo.slc.core/src/org/argeo/slc/osgi/OsgiExecutionResources.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.slc.osgi;
  17
  18 import java.io.File;
  19 import java.io.IOException;
  20
  21 import org.apache.commons.logging.Log;
  22 import org.apache.commons.logging.LogFactory;
  23 import org.argeo.slc.SlcException;
  24 import org.argeo.slc.core.execution.FileExecutionResources;
  25 import org.osgi.framework.BundleContext;
  26 import org.springframework.core.io.Resource;
  27 import org.eclipse.gemini.blueprint.context.BundleContextAware;
  28 import org.eclipse.gemini.blueprint.io.OsgiBundleResource;
  29
  30 /** Write access to resources in an OSGi context */
  31 public class OsgiExecutionResources extends FileExecutionResources implements
  32                 BundleContextAware {
  33         private final static Log log = LogFactory
  34                         .getLog(OsgiExecutionResources.class);
  35
  36         private BundleContext bundleContext;
  37
  38         @Override
  39         protected File fileFromResource(Resource resource) {
  40                 File file = super.fileFromResource(resource);
  41                 if (file != null)
  42                         return file;
  43
  44                 if (!(resource instanceof OsgiBundleResource))
  45                         return null;
  46
  47                 OsgiBundleResource osgiBundleResource = (OsgiBundleResource) resource;
  48                 try {
  49                         return osgiBundleResource.getFile();
  50                 } catch (IOException e) {
  51                         if (log.isTraceEnabled())
  52                                 log.trace("Resource " + resource
  53                                                 + " is not available on the file system: " + e);
  54                 }
  55
  56                 // TODO: ability to access resources in other bundles
  57                 String location = bundleContext.getBundle().getLocation();
  58                 String base = null;
  59                 if (location.startsWith("reference:file:"))
  60                         base = location.substring("reference:file:".length());
  61                 else if (location.startsWith("initial@reference:file:")) {
  62                         // TODO: Equinox specific?
  63                         String relPath = location.substring("initial@reference:file:"
  64                                         .length());
  65                         // if (relPath.startsWith("../"))// relative to the framework jar
  66                         // relPath = relPath.substring("../".length());
  67                         // String framework =
  68                         // System.getProperty("osgi.framework").substring(
  69                         // "file:".length());
  70                         // log.debug(framework);
  71                         String installArea = System.getProperty("osgi.install.area")
  72                                         .substring("file:".length());
  73                         // log.debug(installArea);
  74                         base = installArea + '/' + relPath;
  75                         // int sepIndex = framework.lastIndexOf(File.separatorChar);
  76                         // framework = framework.substring(0, sepIndex);
  77                         // base = framework + '/' + relPath;
  78                 } else {
  79                         return null;
  80                 }
  81
  82                 String path = base + '/' + osgiBundleResource.getPathWithinContext();
  83                 try {
  84                         file = new File(path).getCanonicalFile();
  85                 } catch (IOException e) {
  86                         throw new SlcException("Cannot determine canonical path for "
  87                                         + path, e);
  88                 }
  89
  90                 if (!file.exists())
  91                         throw new SlcException(file
  92                                         + " was retrieved in bundle located at '" + location
  93                                         + "' for resource " + resource + " but it does not exist");
  94
  95                 if (log.isTraceEnabled())
  96                         log.debug("OSGi local resource: " + file + " from " + resource);
  97                 return file;
  98         }
  99
 100         public void setBundleContext(BundleContext bundleContext) {
 101                 this.bundleContext = bundleContext;
 102         }
 103
 104 }