ConstructorInfo.java

package org.jdiameter.client.impl.annotation.internal;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.util.Collection;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class ConstructorInfo {

  private Storage storage;
  private Constructor constr;
  private ClassInfo classInfo;
  private Collection<Annotation> annotationsCache;
  private Map<Class<?>, Annotation> annotationStorage;

  public ConstructorInfo(Storage storage, ClassInfo classInfo, Constructor constr) {
    this.storage = storage;
    this.classInfo = classInfo;
    this.constr = constr;
  }

  public Constructor getConstructor() {
    return constr;
  }

  public ClassInfo getClassInfo() {
    return classInfo;
  }

  public Collection<Annotation> getAnnotations() {
    return annotationsCache == null ? (annotationsCache = getAnnotationStorage().values()) : annotationsCache;
  }

  private Map<Class<?>, Annotation> getAnnotationStorage(){
    if (annotationStorage == null) {
      annotationStorage = new ConcurrentHashMap<Class<?>, Annotation>();
      Class<?> parent = getClassInfo().getAttachedClass().getSuperclass();
      if (parent != null) {
        addAnnotations(storage.getClassInfo(parent).getConstructorInfo(getConstructor().getParameterTypes()));
      }
      for (Class<?> i : getClassInfo().getAttachedClass().getInterfaces()) {
        addAnnotations(storage.getClassInfo(i).getConstructorInfo(getConstructor().getParameterTypes()));
      }
      for (Annotation a : getConstructor().getDeclaredAnnotations()) {
        annotationStorage.put(a.getClass().getInterfaces()[0], a);
      }
    }
    return annotationStorage;
  }

  private void addAnnotations(ConstructorInfo constr) {
    if (constr != null) {
      for (Annotation annotation : constr.getAnnotations()) {
        if (annotation != null) {
          for (Class<?> _interface : annotation.getClass().getInterfaces()) {
            annotationStorage.put( _interface, annotation ); // [0]
          }
        }
      }
    }
  }

  public <T> T getAnnotation(Class<?> annotation) {
    for (Annotation a : getAnnotations()) {
      if (a.annotationType() == annotation) {
        return (T) a;
      }
    }
    return null;
  }
}