org.apache.druid.annotations.SubclassesMustBePublicAnnotationProcessor Maven / Gradle / Ivy

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A module that is everything required to understands Druid Segments

There is a newer version: 30.0.1

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.annotations;

import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.lang.model.element.Element;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic;
import java.util.Set;

@SupportedAnnotationTypes("org.apache.druid.annotations.SubclassesMustBePublic")
public class SubclassesMustBePublicAnnotationProcessor extends AbstractProcessor
{
  @Override
  public boolean process(Set annotations, RoundEnvironment roundEnv)
  {
    for (TypeElement annotation : annotations) {
      Set elementsAnnotatedWith = roundEnv.getElementsAnnotatedWith(annotation);
      for (Element element : elementsAnnotatedWith) {
        if (!element.getModifiers().contains(Modifier.PUBLIC)) {
          processingEnv.getMessager().printMessage(
              Diagnostic.Kind.ERROR,
              element.getSimpleName() + " must be public",
              element
          );
        }
      }
    }
    return false;
  }
}