/*

  * Copyright 2011 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 1.0 (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.opensource.org/licenses/ecl1.php

  *

  * 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.kuali.student.datadictionary.util;

 import java.beans.BeanInfo;

 import java.beans.IntrospectionException;

 import java.beans.Introspector;

 import java.beans.PropertyDescriptor;

 import java.lang.reflect.Field;

 import java.lang.reflect.ParameterizedType;

 import java.lang.reflect.Type;

 import java.lang.reflect.TypeVariable;

 import java.util.Date;

 import java.util.LinkedHashSet;

 import java.util.List;

 import java.util.Set;

 public class ComplexSubstructuresHelper {

     public Set<String> getComplexStructures(String className) {

         Set<String> complexStructures = new LinkedHashSet<String>();

         loadComplexStructures(className, complexStructures);

         return complexStructures;

     }

     private void loadComplexStructures(String className,

             Set<String> complexStructures) {

         if (!complexStructures.add(className)) {

             return;

         }

         BeanInfo beanInfo;

         Class<?> clazz;

         try {

             clazz = Thread.currentThread().getContextClassLoader().loadClass(className);

             // had to change the standard Class.forName below to the above so it uses the right class loader

             // that is defined in KSDictionaryDocMojo.java

 //            clazz = Class.forName(className);

         } catch (ClassNotFoundException ex) {

             System.out.println("ComplexSubstructuresHelper: Could not process because the class must be a freestanding object: " + className);

             return;

         }

         try {

             beanInfo = Introspector.getBeanInfo(clazz);

         } catch (IntrospectionException ex) {

             throw new RuntimeException(ex);

         }

         for (PropertyDescriptor pd : beanInfo.getPropertyDescriptors()) {

             Class<?> subClass = pd.getPropertyType();

             if (List.class.equals(subClass)) {

                 // recursively check super classes for field if not declared on this class

                 subClass = getActualClassFromList(clazz, pd.getName());

             }

             if (!Class.class.equals(subClass)

                     && !String.class.equals(subClass)

                     && !Integer.class.equals(subClass)

                     && !Long.class.equals(subClass)

                     && !Boolean.class.equals(subClass)

                     && !boolean.class.equals(subClass)

                     && !int.class.equals(subClass)

                     && !long.class.equals(subClass)

                     && !Double.class.equals(subClass)

                     && !Float.class.equals(subClass)

                     && !Date.class.equals(subClass)

                     && !Enum.class.isAssignableFrom(subClass)

                     && !Object.class.equals(subClass)) {

                 loadComplexStructures(subClass.getName(), complexStructures);

             }

         }

     }

     public static Class<?> getActualClassFromList(Class<?> originalClass, String fieldName) {

         if (originalClass.isInterface()) {

             throw new RuntimeException("Interface used in getter, use xxxInfo instead for field: " + originalClass.getName() + "." + fieldName);

         }

         // recursively check super classes for field if not declared on this class

         Class<?> classToCheck = originalClass;

         while (true) {

             try {

                 Field field = classToCheck.getDeclaredField(fieldName);

                 Type type = field.getGenericType();

                 ParameterizedType pt = (ParameterizedType) type;

                 Type actualType = pt.getActualTypeArguments()[0];

                 return (Class<?>) actualType;

             } catch (NoSuchFieldException ex) {

                 classToCheck = classToCheck.getSuperclass();

                 if (classToCheck == null) {

                     throw new RuntimeException("No such field: " + originalClass.getName() + "." + fieldName, ex);

                 }

                 if (classToCheck.equals(Object.class)) {

                     throw new RuntimeException("No such field: " + originalClass.getName() + "." + fieldName, ex);

                 }

             } catch (SecurityException ex) {

                 throw new RuntimeException(originalClass.getName() + "." + fieldName, ex);

             }

         }

     }

 }