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    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
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   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
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  package io.wcm.wcm.ui.granite.util.impl;
  
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  import org.osgi.framework.BundleContext;
  import org.osgi.framework.ServiceReference;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  abstract class AbstractPredicateProviderWrapper implements PredicateProviderWrapper {
  
    private final ServiceReference<?> serviceReference;
    private final BundleContext bundleContext;
    private final Object service;
    private Method getPredicateMethod;
  
    protected final Logger log = LoggerFactory.getLogger(getClass());
  
    AbstractPredicateProviderWrapper(ServiceReference<?> serviceReference, BundleContext bundleContext) {
      this.serviceReference = serviceReference;
      this.bundleContext = bundleContext;
      service = bundleContext.getService(serviceReference);
      if (service != null) {
        try {
          getPredicateMethod = service.getClass().getMethod("getPredicate", String.class);
        }
        catch (NoSuchMethodException | SecurityException ex) {
          log.warn("Legacy PredicateProvider service does not implement expected method 'getPredicate(String)'.", ex);
        }
      }
    }
  
    protected @Nullable Object getPredicateInternal(@NotNull String name) {
      if (getPredicateMethod != null) {
        try {
          return getPredicateMethod.invoke(service, name);
        }
        catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) {
          log.warn("Error calling 'getPredicate(String)' method.", ex);
        }
      }
      return null;
    }
  
    @Override
    public void close() {
      bundleContext.ungetService(serviceReference);
    }
  
  }