/*

  * 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.rice.kns.util;

 import java.beans.BeanInfo;

 import java.beans.IntrospectionException;

 import java.beans.Introspector;

 import java.beans.PropertyDescriptor;

 import org.kuali.rice.kns.bo.BusinessObject;

 /**

  * Pulled this logic out of the org.kuali.rice.kns.workflow.service.impl.WorkflowAttributePropertyResolutionServiceImpl

  * since it wasn't really service logic at all, just util logic.

  * 

  * @author James Renfro

  *

  */

 public class DataTypeUtil {

         public static String determineFieldDataType(Class<? extends BusinessObject> businessObjectClass, String attributeName) {

                 final Class<?> attributeClass = thieveAttributeClassFromBusinessObjectClass(businessObjectClass, attributeName);

                 return determineDataType(attributeClass);

         }

         public static String determineDataType(Class<?> attributeClass) {

         if (isStringy(attributeClass)) return KNSConstants.DATA_TYPE_STRING; // our most common case should go first

         if (isDecimaltastic(attributeClass)) return KNSConstants.DATA_TYPE_FLOAT;

         if (isDateLike(attributeClass)) return KNSConstants.DATA_TYPE_DATE;

         if (isIntsy(attributeClass)) return KNSConstants.DATA_TYPE_LONG;

         if (isBooleanable(attributeClass)) return KNSConstants.DATA_TYPE_BOOLEAN;

         return KNSConstants.DATA_TYPE_STRING; // default to String

     }

     /**

      * Determines if the given Class is a String

      * @param clazz the class to check for Stringiness

      * @return true if the Class is a String, false otherwise

      */

         public static boolean isStringy(Class clazz) {

         return java.lang.String.class.isAssignableFrom(clazz);

     }

     /**

      * Determines if the given class is enough like a date to store values of it as a SearchableAttributeDateTimeValue

      * @param class the class to determine the type of

      * @return true if it is like a date, false otherwise

      */

         public static boolean isDateLike(Class clazz) {

         return java.util.Date.class.isAssignableFrom(clazz);

     }

     /**

      * Determines if the given class is enough like a Float to store values of it as a SearchableAttributeFloatValue

      * @param value the class to determine of the type of

      * @return true if it is like a "float", false otherwise

      */

         public static boolean isDecimaltastic(Class clazz) {

         return java.lang.Double.class.isAssignableFrom(clazz) || java.lang.Float.class.isAssignableFrom(clazz) || clazz.equals(Double.TYPE) || clazz.equals(Float.TYPE) || java.math.BigDecimal.class.isAssignableFrom(clazz) || org.kuali.rice.core.util.type.KualiDecimal.class.isAssignableFrom(clazz);

     }

     /**

      * Determines if the given class is enough like a "long" to store values of it as a SearchableAttributeLongValue

      * @param value the class to determine the type of

      * @return true if it is like a "long", false otherwise

      */

         public static boolean isIntsy(Class clazz) {

         return java.lang.Integer.class.isAssignableFrom(clazz) || java.lang.Long.class.isAssignableFrom(clazz) || java.lang.Short.class.isAssignableFrom(clazz) || java.lang.Byte.class.isAssignableFrom(clazz) || java.math.BigInteger.class.isAssignableFrom(clazz) || clazz.equals(Integer.TYPE) || clazz.equals(Long.TYPE) || clazz.equals(Short.TYPE) || clazz.equals(Byte.TYPE);

     }

     /**

      * Determines if the given class is enough like a boolean, to index it as a String "Y" or "N"

      * @param value the class to determine the type of

      * @return true if it is like a boolean, false otherwise

      */

         public static boolean isBooleanable(Class clazz) {

         return java.lang.Boolean.class.isAssignableFrom(clazz) || clazz.equals(Boolean.TYPE);

     }

     /**

      * Given a BusinessObject class and an attribute name, determines the class of that attribute on the BusinessObject class

      * @param boClass a class extending BusinessObject

      * @param attributeKey the name of a field on that class

      * @return the Class of the given attribute

      */

     private static Class thieveAttributeClassFromBusinessObjectClass(Class<? extends BusinessObject> boClass, String attributeKey) {

         Class attributeFieldClass = null;

         try {

             final BeanInfo beanInfo = Introspector.getBeanInfo(boClass);

             int i = 0;

             while (attributeFieldClass == null && i < beanInfo.getPropertyDescriptors().length) {

                 final PropertyDescriptor prop = beanInfo.getPropertyDescriptors()[i];

                 if (prop.getName().equals(attributeKey)) {

                     attributeFieldClass = prop.getPropertyType();

                 }

                 i += 1;

             }

         }

         catch (SecurityException se) {

             throw new RuntimeException("Could not determine type of attribute "+attributeKey+" of BusinessObject class "+boClass.getName(), se);

         }

         catch (IntrospectionException ie) {

             throw new RuntimeException("Could not determine type of attribute "+attributeKey+" of BusinessObject class "+boClass.getName(), ie);

         }

         return attributeFieldClass;

     }

 }