LegacyPredicateProviderWrapper.java

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 * Licensed under the Apache License, Version 2.0 (the "License");
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package io.wcm.wcm.ui.granite.util.impl;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.commons.collections4.Predicate;
import org.apache.sling.api.resource.Resource;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;

/**
 * Wrapper for legacy PredicateProvider implementation that returns Commons Collection 3 Predicate.
 */
class LegacyPredicateProviderWrapper extends AbstractPredicateProviderWrapper {

  LegacyPredicateProviderWrapper(ServiceReference<?> serviceReference, BundleContext bundleContext) {
    super(serviceReference, bundleContext);
  }

  @Override
  public @Nullable Predicate<Resource> getPredicate(@NotNull String name) {
    Object predicate = getPredicateInternal(name);
    if (predicate != null) {
      Method evaluateMethod;
      try {
        evaluateMethod = predicate.getClass().getMethod("evaluate", Object.class);
        return resource -> {
          try {
            return Boolean.TRUE.equals(evaluateMethod.invoke(predicate, resource));
          }
          catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) {
            log.warn("Error calling 'getPredicate(String)' on legacy PredicateProvider service.", ex);
            return false;
          }
        };
      }
      catch (NoSuchMethodException | SecurityException ex) {
        log.warn("Legacy Predicate does not implement expected method 'evaluate(Object)'.", ex);
      }
    }
    return null;
  }

}