com.querydsl.codegen.GeneratedAnnotationResolver Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of querydsl-codegen Show documentation
codegen module for querydsl
The newest version!
package com.querydsl.codegen;

import java.lang.annotation.Annotation;
import org.jetbrains.annotations.Nullable;

/**
 * {@code GeneratedAnnotationClassResolver} provides class name resolving functionality for
 * resolving the annotation type to be used on {@link Serializer}s generated sources.
 */
public final class GeneratedAnnotationResolver {

  private static final Class DEFAULT_GENERATED_ANNOTATION_CLASS =
      resolveJavaDefault();

  /**
   * Use the {@code generatedAnnotationClass} or use the JDK one.
   *
   * A {@code null generatedAnnotationClass} will resolve to the java {@code @Generated}
   * annotation (can be of type {@code javax.annotation.Generated} or {@code
   * javax.annotation.processing.Generated} depending on the java version.
   *
   * @param generatedAnnotationClass the fully qualified class name of the Single-Element
   *     Annotation (with {@code String} element) to use or {@code null}.
   * @return the provided {@code generatedAnnotationClass} if not {@code null} or the one from java.
   *     Never {@code null}.
   * @see Single-Element
   *     Annotation
   */
  public static Class resolve(@Nullable String generatedAnnotationClass) {
    if (generatedAnnotationClass != null) {
      try {
        return (Class) Class.forName(generatedAnnotationClass);
      } catch (Exception e) {
        // Try next one
      }
    }

    return resolveDefault();
  }

  /**
   * Resolve the java {@code @Generated} annotation (can be of type {@code
   * javax.annotation.Generated} or {@code javax.annotation.processing.Generated} depending on the
   * java version.
   *
   * @return the Generated annotation class from java. Never {@code null}.
   */
  public static Class resolveDefault() {
    return DEFAULT_GENERATED_ANNOTATION_CLASS;
  }

  @SuppressWarnings("unchecked")
  private static Class resolveJavaDefault() {
    try {
      return (Class) Class.forName("javax.annotation.processing.Generated");
    } catch (Exception e) {
      // Try next one
    }

    try {
      return (Class) Class.forName("javax.annotation.Generated");
    } catch (Exception e) {
      // Try next one
    }

    try {
      return (Class) Class.forName("jakarta.annotation.Generated");
    } catch (Exception e) {
      // Try next one
    }

    throw new IllegalStateException("Can't find Generated annotation");
  }

  private GeneratedAnnotationResolver() {}
}