How to use

initEngineTracker

method

in

org.apache.stanbol.enhancer.servicesapi.impl.EnginesTracker

/**
 * Creates a new {@link EnginesTracker} for the parsed {@link BundleContext}
 * and engine names.
 * Examples:
 * <code><pre>
 *     //Track all active engines with a customiser
 *     new EnginesTracker(context,null,customiser);
 *     
 *     //Track all engines referenced by a Chain and use the customiser
 *     //to react on changes
 *     new EnginesTracker(context,chain.getEngineNames(),customiser);
 * </pre></code>
 * @param context the bundle context used to track engines
 * @param engineNames the names of the engines to track. Parse <code>null</code>
 * or an {@link Collections#emptySet()} to track all engines
 * @param customizer the {@link ServiceTrackerCustomizer} used with this tracker.
 */
public EnginesTracker(BundleContext context, Set<String> engineNames, ServiceTrackerCustomizer customizer){
  if(context == null){
    throw new IllegalArgumentException("The parsed BundleContext MUST NOT be NULL!");
  }
  initEngineTracker(context,engineNames,customizer);
}

/**
 * Creates a new {@link EnginesTracker} for the parsed {@link BundleContext}
 * and engine names.
 * Examples:
 * <code><pre>
 *     //Track all active engines with a customiser
 *     new EnginesTracker(context,null,customiser);
 *     
 *     //Track all engines referenced by a Chain and use the customiser
 *     //to react on changes
 *     new EnginesTracker(context,chain.getEngineNames(),customiser);
 * </pre></code>
 * @param context the bundle context used to track engines
 * @param engineNames the names of the engines to track. Parse <code>null</code>
 * or an {@link Collections#emptySet()} to track all engines
 * @param customizer the {@link ServiceTrackerCustomizer} used with this tracker.
 */
public EnginesTracker(BundleContext context, Set<String> engineNames, ServiceTrackerCustomizer customizer){
  if(context == null){
    throw new IllegalArgumentException("The parsed BundleContext MUST NOT be NULL!");
  }
  initEngineTracker(context,engineNames,customizer);
}

protected EnginesTracker(){/* nothing to do here */ }    /**
 * Creates a new {@link EnginesTracker} for the parsed {@link BundleContext}
 * and engine names.
 * Examples:
 * <code><pre>
 *     //Track all active engines
 *     new EnginesTracker(context);
 *     
 *     //Track only the langId engine
 *     new EnginesTracker(context,langId);
 * </pre></code>
 * @param context The bundle context used to track engines
 * @param engineNames the name of the engines to track. If empty 
 * all engines are tracked.
 */
public EnginesTracker(BundleContext context, String...engineNames){
  if(context == null){
    throw new IllegalArgumentException("The parsed BundleContext MUST NOT be NULL!");
  }
  final Set<String> names;
  if(engineNames == null){
    names = Collections.emptySet();
  } else {
    names = new HashSet<String>(Arrays.asList(engineNames));
  }
  initEngineTracker(context,names,null);
}
/**

protected EnginesTracker(){/* nothing to do here */ }    /**
 * Creates a new {@link EnginesTracker} for the parsed {@link BundleContext}
 * and engine names.
 * Examples:
 * <code><pre>
 *     //Track all active engines
 *     new EnginesTracker(context);
 *     
 *     //Track only the langId engine
 *     new EnginesTracker(context,langId);
 * </pre></code>
 * @param context The bundle context used to track engines
 * @param engineNames the name of the engines to track. If empty 
 * all engines are tracked.
 */
public EnginesTracker(BundleContext context, String...engineNames){
  if(context == null){
    throw new IllegalArgumentException("The parsed BundleContext MUST NOT be NULL!");
  }
  final Set<String> names;
  if(engineNames == null){
    names = Collections.emptySet();
  } else {
    names = new HashSet<String>(Arrays.asList(engineNames));
  }
  initEngineTracker(context,names,null);
}
/**