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A processor for the @AutoSerialize annotation

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package eu.toolchain.serializer.processor.annotation;

import eu.toolchain.serializer.processor.AutoSerializeUtils;
import java.util.Optional;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;
import javax.lang.model.type.TypeMirror;
import lombok.Data;

@Data
public class BuilderMirror {
  private final AnnotationMirror annotation;

  private final boolean useSetter;
  private final boolean useMethod;
  private final boolean useConstructor;
  private final Optional> type;
  private final String methodName;

  public static BuilderMirror getFor(
    final AutoSerializeUtils utils, final Element element, final AnnotationMirror a
  ) {
    final AnnotationValues values = utils.getElementValuesWithDefaults(element, a);

    final boolean useSetter = values.getBoolean("useSetter").get();
    final boolean useMethod = values.getBoolean("useMethod").get();
    final boolean useConstructor = values.getBoolean("useConstructor").get();
    final String methodName = values.getString("methodName").get();

    final AnnotationValues.Value type = values.getTypeMirror("type");

    final Optional> typeMirror = Optional
      .of(type)
      .filter((t) -> !t.get().toString().equals(AutoSerializeUtils.DEFAULT_BUILDER_TYPE));

    return new BuilderMirror(a, useSetter, useMethod, useConstructor, typeMirror, methodName);
  }

  public boolean shouldUseConstructor() {
    // use explicitly ask to use method.
    if (useMethod) {
      return false;
    }

    // use explicitly ask to use constructor.
    if (useConstructor) {
      return true;
    }

    // by policy, if a type is specified, the constructor should be used.
    if (type.isPresent()) {
      return true;
    }

    return false;
  }
}