org.argeo.cms.e4/src/org/argeo/cms/e4/OsgiFilterContextFunction.java

   1 package org.argeo.cms.e4;
   2
   3 import org.argeo.cms.CmsException;
   4 import org.eclipse.e4.core.contexts.ContextFunction;
   5 import org.eclipse.e4.core.contexts.IEclipseContext;
   6 import org.eclipse.e4.core.di.IInjector;
   7 import org.osgi.framework.BundleContext;
   8 import org.osgi.framework.FrameworkUtil;
   9 import org.osgi.framework.InvalidSyntaxException;
  10 import org.osgi.framework.ServiceReference;
  11
  12 /** An Eclipse 4 {@link ContextFunction} based on an OSGi filter. */
  13 public class OsgiFilterContextFunction extends ContextFunction {
  14
  15         private BundleContext bc = FrameworkUtil.getBundle(OsgiFilterContextFunction.class).getBundleContext();
  16
  17         @Override
  18         public Object compute(IEclipseContext context, String contextKey) {
  19                 ServiceReference<?>[] srs;
  20                 try {
  21                         srs = bc.getServiceReferences((String) null, contextKey);
  22                 } catch (InvalidSyntaxException e) {
  23                         throw new CmsException("Context key " + contextKey + " must be a valid osgi filter", e);
  24                 }
  25                 if (srs == null || srs.length == 0) {
  26                         return IInjector.NOT_A_VALUE;
  27                 } else {
  28                         // return the first one
  29                         return bc.getService(srs[0]);
  30                 }
  31         }
  32
  33 }