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annotation processor generating json adapters

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package io.avaje.validation.generator;

import java.util.Objects;

import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.TypeMirror;

final class ComponentReader {

  private final ComponentMetaData componentMetaData;

  ComponentReader(ComponentMetaData metaData) {
    this.componentMetaData = metaData;
  }

  void read() {
    ProcessingContext.readExistingMetaInfServices().stream()
      .map(APContext::typeElement)
      .filter(Objects::nonNull)
      .filter(t -> "io.avaje.validation.spi.GeneratedComponent".equals(t.getSuperclass().toString()))
      .findFirst()
      .ifPresent(moduleType -> {
        componentMetaData.setFullName(moduleType.getQualifiedName().toString());
        readMetaData(moduleType);
      });
  }

  /** Read the existing adapters from the MetaData annotation of the generated component. */
  private void readMetaData(TypeElement moduleType) {
    for (final AnnotationMirror annotationMirror : moduleType.getAnnotationMirrors()) {
      final MetaDataPrism metaData = MetaDataPrism.getInstance(annotationMirror);
      final ValidFactoryPrism metaDataFactory = ValidFactoryPrism.getInstance(annotationMirror);
      final AnnotationFactoryPrism metaDataAnnotationFactory = AnnotationFactoryPrism.getInstance(annotationMirror);

      if (metaData != null) {
        metaData.value().stream().map(TypeMirror::toString).forEach(componentMetaData::add);

      } else if (metaDataFactory != null) {
        metaDataFactory.value().stream().map(TypeMirror::toString).forEach(componentMetaData::add);

      } else if (metaDataAnnotationFactory != null) {
        metaDataAnnotationFactory.value().stream()
          .map(APContext::asTypeElement)
          .forEach(componentMetaData::addAnnotationAdapter);
      }
    }
  }
}