/**
    * Copyright 2005-2014 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 2.0 (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/ecl2.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.krad.datadictionary;
  
  import org.apache.commons.beanutils.PropertyUtils;
  import org.apache.commons.lang.ArrayUtils;
  import org.apache.commons.lang.StringUtils;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.kuali.rice.core.api.util.ClassLoaderUtils;
  import org.kuali.rice.krad.bo.PersistableBusinessObjectExtension;
  import org.kuali.rice.krad.datadictionary.exception.AttributeValidationException;
  import org.kuali.rice.krad.datadictionary.exception.CompletionException;
  import org.kuali.rice.krad.datadictionary.parse.StringListConverter;
  import org.kuali.rice.krad.datadictionary.parse.StringMapConverter;
  import org.kuali.rice.krad.service.KRADServiceLocator;
  import org.kuali.rice.krad.service.PersistenceStructureService;
  import org.kuali.rice.krad.uif.UifConstants.ViewType;
  import org.kuali.rice.krad.uif.util.ComponentBeanPostProcessor;
  import org.kuali.rice.krad.uif.util.UifBeanFactoryPostProcessor;
  import org.kuali.rice.krad.uif.view.View;
  import org.kuali.rice.krad.util.ObjectUtils;
  import org.springframework.beans.PropertyValues;
  import org.springframework.beans.factory.config.BeanPostProcessor;
  import org.springframework.beans.factory.support.KualiDefaultListableBeanFactory;
  import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
  import org.springframework.context.expression.StandardBeanExpressionResolver;
  import org.springframework.core.convert.support.GenericConversionService;
  import org.springframework.core.io.DefaultResourceLoader;
  import org.springframework.core.io.Resource;
  
  import java.beans.PropertyDescriptor;
  import java.io.File;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.TreeMap;
  
  /**
   * Collection of named BusinessObjectEntry objects, each of which contains
   * information relating to the display, validation, and general maintenance of a
   * BusinessObject.
   */
  public class DataDictionary  {
  
  	protected KualiDefaultListableBeanFactory ddBeans = new KualiDefaultListableBeanFactory();
      protected XmlBeanDefinitionReader xmlReader = new XmlBeanDefinitionReader(ddBeans);
  
  	// logger
  	private static final Log LOG = LogFactory.getLog(DataDictionary.class);
  
  	/**
  	 * The encapsulation of DataDictionary indices
  	 */
  	protected DataDictionaryIndex ddIndex = new DataDictionaryIndex(ddBeans);
  	
  	// View indices
  	protected UifDictionaryIndex uifIndex = new UifDictionaryIndex(ddBeans);
  
  	/**
  	 * The DataDictionaryMapper
  	 * The default mapper simply consults the initialized indices
  	 * on workflow document type
  	 */
  	protected DataDictionaryMapper ddMapper = new DataDictionaryIndexMapper();
  
  	protected List<String> configFileLocations = new ArrayList<String>();
  	
  
  	public List<String> getConfigFileLocations() {
          return this.configFileLocations;
      }
  
      public void setConfigFileLocations(List<String> configFileLocations) {
          this.configFileLocations = configFileLocations;
      }
      
      public void addConfigFileLocation( String location ) throws IOException {
          indexSource( location );
      }
  
      /**
      * Sets the DataDictionaryMapper
      * @param mapper the datadictionary mapper
      */
     public void setDataDictionaryMapper(DataDictionaryMapper mapper) {
     	this.ddMapper = mapper;
     }
     
     private void indexSource(String sourceName) throws IOException {        
         if (sourceName == null) {
             throw new DataDictionaryException("Source Name given is null");
         }
 
         if (!sourceName.endsWith(".xml") ) {
             Resource resource = getFileResource(sourceName);
             if (resource.exists()) {
                 indexSource(resource.getFile());
             } else {
                 LOG.warn("Could not find " + sourceName);
                 throw new DataDictionaryException("DD Resource " + sourceName + " not found");
             }
         } else {
             if ( LOG.isDebugEnabled() ) {
                 LOG.debug("adding sourceName " + sourceName + " ");
             }
             Resource resource = getFileResource(sourceName);
             if (! resource.exists()) {
                 throw new DataDictionaryException("DD Resource " + sourceName + " not found");  
             }
             
             String indexName = sourceName.substring(sourceName.lastIndexOf("/") + 1, sourceName.indexOf(".xml"));
             configFileLocations.add( sourceName );
         }
     }    
 
     protected Resource getFileResource(String sourceName) {
         DefaultResourceLoader resourceLoader = new DefaultResourceLoader(ClassLoaderUtils.getDefaultClassLoader());
         return resourceLoader.getResource(sourceName);
     }
 
     private void indexSource(File dir) {
         for (File file : dir.listFiles()) {
             if (file.isDirectory()) {
                 indexSource(file);
             } else if (file.getName().endsWith(".xml") ) {
                 configFileLocations.add( "file:" + file.getAbsolutePath());
             } else {
                 if ( LOG.isDebugEnabled() ) {
                     LOG.debug("Skipping non xml file " + file.getAbsolutePath() + " in DD load");
                 }
             }
         }
     }
     
     public void parseDataDictionaryConfigurationFiles( boolean allowConcurrentValidation ) {
 		// configure the bean factory, setup component decorator post processor
 		// and allow Spring EL
         try {
             BeanPostProcessor idPostProcessor = ComponentBeanPostProcessor.class.newInstance();
             ddBeans.addBeanPostProcessor(idPostProcessor);
             ddBeans.setBeanExpressionResolver(new StandardBeanExpressionResolver());
 
             GenericConversionService conversionService = new GenericConversionService();
             conversionService.addConverter(new StringMapConverter());
             conversionService.addConverter(new StringListConverter());
             ddBeans.setConversionService(conversionService);
         } catch (Exception e1) {
             LOG.error("Cannot create component decorator post processor: " + e1.getMessage(), e1);
             throw new RuntimeException("Cannot create component decorator post processor: " + e1.getMessage(), e1);
         }
 
         // expand configuration locations into files
         LOG.info("Starting DD XML File Load");
 
         String[] configFileLocationsArray = new String[configFileLocations.size()];
         configFileLocationsArray = configFileLocations.toArray(configFileLocationsArray);
         configFileLocations.clear(); // empty the list out so other items can be added
         try {
             xmlReader.loadBeanDefinitions(configFileLocationsArray);
         } catch (Exception e) {
             LOG.error("Error loading bean definitions", e);
             throw new DataDictionaryException("Error loading bean definitions: " + e.getLocalizedMessage());
         }
         LOG.info("Completed DD XML File Load");
 
         UifBeanFactoryPostProcessor factoryPostProcessor = new UifBeanFactoryPostProcessor();
         factoryPostProcessor.postProcessBeanFactory(ddBeans);
 
         // indexing
         if (allowConcurrentValidation) {
             Thread t = new Thread(ddIndex);
             t.start();
 
             Thread t2 = new Thread(uifIndex);
             t2.start();
         } else {
             ddIndex.run();
             uifIndex.run();
         }
     }
 
 	static boolean validateEBOs = true;
     
     public void validateDD( boolean validateEbos ) {
     	DataDictionary.validateEBOs = validateEbos;
     	Map<String,DataObjectEntry> doBeans = ddBeans.getBeansOfType(DataObjectEntry.class);
         for ( DataObjectEntry entry : doBeans.values() ) {
             entry.completeValidation();
         }
         Map<String,DocumentEntry> docBeans = ddBeans.getBeansOfType(DocumentEntry.class);
         for ( DocumentEntry entry : docBeans.values() ) {
             entry.completeValidation();
         }
     }
     
     public void validateDD() {
     	validateDD(true);
     }
 
 	/**
 	 * @param className
 	 * @return BusinessObjectEntry for the named class, or null if none exists
 	 */
     @Deprecated
 	public BusinessObjectEntry getBusinessObjectEntry(String className ) {
 		return ddMapper.getBusinessObjectEntry(ddIndex, className);
 	}
 
 	/**
      * @param className
      * @return BusinessObjectEntry for the named class, or null if none exists
      */
     public DataObjectEntry getDataObjectEntry(String className ) {
         return ddMapper.getDataObjectEntry(ddIndex, className);
     }
 
 	/**
 	 * This method gets the business object entry for a concrete class
 	 * 
 	 * @param className
 	 * @return
 	 */
 	public BusinessObjectEntry getBusinessObjectEntryForConcreteClass(String className){
 		return ddMapper.getBusinessObjectEntryForConcreteClass(ddIndex, className);
 	}
 	
 	/**
 	 * @return List of businessObject classnames
 	 */
 	public List<String> getBusinessObjectClassNames() {
 		return ddMapper.getBusinessObjectClassNames(ddIndex);
 	}
 
 	/**
 	 * @return Map of (classname, BusinessObjectEntry) pairs
 	 */
 	public Map<String, BusinessObjectEntry> getBusinessObjectEntries() {
 		return ddMapper.getBusinessObjectEntries(ddIndex);
 	}
 
 	/**
 	 * @param className
 	 * @return DataDictionaryEntryBase for the named class, or null if none
 	 *         exists
 	 */
 	public DataDictionaryEntry getDictionaryObjectEntry(String className) {
 		return ddMapper.getDictionaryObjectEntry(ddIndex, className);
 	}
 
 	/**
 	 * Returns the KNS document entry for the given lookup key.  The documentTypeDDKey is interpreted
 	 * successively in the following ways until a mapping is found (or none if found):
 	 * <ol>
 	 * <li>KEW/workflow document type</li>
 	 * <li>business object class name</li>
 	 * <li>maintainable class name</li>
 	 * </ol>
 	 * This mapping is compiled when DataDictionary files are parsed on startup (or demand).  Currently this
 	 * means the mapping is static, and one-to-one (one KNS document maps directly to one and only
 	 * one key).
 	 * 
 	 * @param documentTypeDDKey the KEW/workflow document type name
 	 * @return the KNS DocumentEntry if it exists
 	 */
 	public DocumentEntry getDocumentEntry(String documentTypeDDKey ) {
 		return ddMapper.getDocumentEntry(ddIndex, documentTypeDDKey);
 	}
 
 	/**
 	 * Note: only MaintenanceDocuments are indexed by businessObject Class
 	 * 
 	 * This is a special case that is referenced in one location. Do we need
 	 * another map for this stuff??
 	 * 
 	 * @param businessObjectClass
 	 * @return DocumentEntry associated with the given Class, or null if there
 	 *         is none
 	 */
 	public MaintenanceDocumentEntry getMaintenanceDocumentEntryForBusinessObjectClass(Class<?> businessObjectClass) {
 		return ddMapper.getMaintenanceDocumentEntryForBusinessObjectClass(ddIndex, businessObjectClass);
 	}
 
 	public Map<String, DocumentEntry> getDocumentEntries() {
 		return ddMapper.getDocumentEntries(ddIndex);
 	}
 	
 	/**
 	 * Returns the View entry identified by the given id
 	 * 
 	 * @param viewId - unique id for view
 	 * @return View instance associated with the id
 	 */
 	public View getViewById(String viewId) {
 		return ddMapper.getViewById(uifIndex, viewId);
 	}
 	
 	/**
 	 * Returns View instance identified by the view type name and index
 	 * 
 	 * @param viewTypeName
 	 *            - type name for the view
 	 * @param indexKey
 	 *            - Map of index key parameters, these are the parameters the
 	 *            indexer used to index the view initially and needs to identify
 	 *            an unique view instance
 	 * @return View instance that matches the given index
 	 */
 	public View getViewByTypeIndex(ViewType viewTypeName, Map<String, String> indexKey) {
 		return ddMapper.getViewByTypeIndex(uifIndex, viewTypeName, indexKey);
 	}
 
     /**
      * Indicates whether a <code>View</code> exists for the given view type and index information
      *
      * @param viewTypeName - type name for the view
      * @param indexKey - Map of index key parameters, these are the parameters the
      * indexer used to index the view initially and needs to identify
      * an unique view instance
      * @return boolean true if view exists, false if not
      */
     public boolean viewByTypeExist(ViewType viewTypeName, Map<String, String> indexKey) {
         return ddMapper.viewByTypeExist(uifIndex, viewTypeName, indexKey);
     }
 	
 	/**
 	 * Gets all <code>View</code> prototypes configured for the given view type
 	 * name
 	 * 
 	 * @param viewTypeName
 	 *            - view type name to retrieve
 	 * @return List<View> view prototypes with the given type name, or empty
 	 *         list
 	 */
 	public List<View> getViewsForType(ViewType viewTypeName) {
 		return ddMapper.getViewsForType(uifIndex, viewTypeName);
 	}
 
     /**
      * Returns an object from the dictionary by its spring bean name
      *
      * @param beanName - id or name for the bean definition
      * @return Object object instance created or the singleton being maintained
      */
     public Object getDictionaryObject(String beanName) {
         return ddBeans.getBean(beanName);
     }
 
     /**
      * Indicates whether the data dictionary contains a bean with the given id
      *
      * @param id - id of the bean to check for
      * @return boolean true if dictionary contains bean, false otherwise
      */
     public boolean containsDictionaryObject(String id) {
         return ddBeans.containsBean(id);
     }
 
     /**
      * Retrieves the configured property values for the view bean definition associated with the given id
      *
      * <p>
      * Since constructing the View object can be expensive, when metadata only is needed this method can be used
      * to retrieve the configured property values. Note this looks at the merged bean definition
      * </p>
      *
      * @param viewId - id for the view to retrieve
      * @return PropertyValues configured on the view bean definition, or null if view is not found
      */
     public PropertyValues getViewPropertiesById(String viewId) {
         return ddMapper.getViewPropertiesById(uifIndex, viewId);
     }
 
     /**
      * Retrieves the configured property values for the view bean definition associated with the given type and
      * index
      *
      * <p>
      * Since constructing the View object can be expensive, when metadata only is needed this method can be used
      * to retrieve the configured property values. Note this looks at the merged bean definition
      * </p>
      *
      * @param viewTypeName - type name for the view
      * @param indexKey - Map of index key parameters, these are the parameters the indexer used to index
      * the view initially and needs to identify an unique view instance
      * @return PropertyValues configured on the view bean definition, or null if view is not found
      */
     public PropertyValues getViewPropertiesByType(ViewType viewTypeName, Map<String, String> indexKey) {
         return ddMapper.getViewPropertiesByType(uifIndex, viewTypeName, indexKey);
     }
 
     /**
      * @param targetClass
      * @param propertyName
      * @return true if the given propertyName names a property of the given class
      * @throws CompletionException if there is a problem accessing the named property on the given class
      */
     public static boolean isPropertyOf(Class targetClass, String propertyName) {
         if (targetClass == null) {
             throw new IllegalArgumentException("invalid (null) targetClass");
         }
         if (StringUtils.isBlank(propertyName)) {
             throw new IllegalArgumentException("invalid (blank) propertyName");
         }
 
         PropertyDescriptor propertyDescriptor = buildReadDescriptor(targetClass, propertyName);
 
         boolean isPropertyOf = (propertyDescriptor != null);
         return isPropertyOf;
     }
 
     /**
      * @param targetClass
      * @param propertyName
      * @return true if the given propertyName names a Collection property of the given class
      * @throws CompletionException if there is a problem accessing the named property on the given class
      */
     public static boolean isCollectionPropertyOf(Class targetClass, String propertyName) {
         boolean isCollectionPropertyOf = false;
 
         PropertyDescriptor propertyDescriptor = buildReadDescriptor(targetClass, propertyName);
         if (propertyDescriptor != null) {
             Class clazz = propertyDescriptor.getPropertyType();
 
             if ((clazz != null) && Collection.class.isAssignableFrom(clazz)) {
                 isCollectionPropertyOf = true;
             }
         }
 
         return isCollectionPropertyOf;
     }
 
     public static PersistenceStructureService persistenceStructureService;
     
     /**
      * @return the persistenceStructureService
      */
     public static PersistenceStructureService getPersistenceStructureService() {
         if ( persistenceStructureService == null ) {
             persistenceStructureService = KRADServiceLocator.getPersistenceStructureService();
         }
         return persistenceStructureService;
     }
     
     /**
      * This method determines the Class of the attributeName passed in. Null will be returned if the member is not available, or if
      * a reflection exception is thrown.
      * 
      * @param boClass - Class that the attributeName property exists in.
      * @param attributeName - Name of the attribute you want a class for.
      * @return The Class of the attributeName, if the attribute exists on the rootClass. Null otherwise.
      */
     public static Class getAttributeClass(Class boClass, String attributeName) {
 
         // fail loudly if the attributeName isnt a member of rootClass
         if (!isPropertyOf(boClass, attributeName)) {
             throw new AttributeValidationException("unable to find attribute '" + attributeName + "' in rootClass '" + boClass.getName() + "'");
         }
 
     	//Implementing Externalizable Business Object Services...
         //The boClass can be an interface, hence handling this separately, 
         //since the original method was throwing exception if the class could not be instantiated.
         if(boClass.isInterface())
         	return getAttributeClassWhenBOIsInterface(boClass, attributeName);
         else
         	return getAttributeClassWhenBOIsClass(boClass, attributeName);        	
 
     }
 
     /**
      * 
      * This method gets the property type of the given attributeName when the bo class is a concrete class
      * 
      * @param boClass
      * @param attributeName
      * @return
      */
     private static Class getAttributeClassWhenBOIsClass(Class boClass, String attributeName){
     	Object boInstance;
         try {
             boInstance = boClass.newInstance();
         } catch (Exception e) {
         	throw new RuntimeException("Unable to instantiate Data Object: " + boClass, e);
         }
 
         // attempt to retrieve the class of the property
         try {
             return ObjectUtils.getPropertyType(boInstance, attributeName, getPersistenceStructureService());
         } catch (Exception e) {
             throw new RuntimeException("Unable to determine property type for: " + boClass.getName() + "." + attributeName, e);
         }
     }
 
     /**
      * 
      * This method gets the property type of the given attributeName when the bo class is an interface
      * This method will also work if the bo class is not an interface, 
      * but that case requires special handling, hence a separate method getAttributeClassWhenBOIsClass 
      * 
      * @param boClass
      * @param attributeName
      * @return
      */
     private static Class getAttributeClassWhenBOIsInterface(Class boClass, String attributeName){
         if (boClass == null) {
             throw new IllegalArgumentException("invalid (null) boClass");
         }
         if (StringUtils.isBlank(attributeName)) {
             throw new IllegalArgumentException("invalid (blank) attributeName");
         }
 
         PropertyDescriptor propertyDescriptor = null;
 
         String[] intermediateProperties = attributeName.split("\\.");
         int lastLevel = intermediateProperties.length - 1;
         Class currentClass = boClass;
 
         for (int i = 0; i <= lastLevel; ++i) {
 
             String currentPropertyName = intermediateProperties[i];
             propertyDescriptor = buildSimpleReadDescriptor(currentClass, currentPropertyName);
 
             if (propertyDescriptor != null) {
 
                 Class propertyType = propertyDescriptor.getPropertyType();
                 if ( propertyType.equals( PersistableBusinessObjectExtension.class ) ) {
                     propertyType = getPersistenceStructureService().getBusinessObjectAttributeClass( currentClass, currentPropertyName );                    
                 }
                 if (Collection.class.isAssignableFrom(propertyType)) {
                 	// TODO: determine property type using generics type definition
                 	throw new AttributeValidationException("Can't determine the Class of Collection elements because when the business object is an (possibly ExternalizableBusinessObject) interface.");
                 }
                 else {
                     currentClass = propertyType;
                 }
             }
             else {
             	throw new AttributeValidationException("Can't find getter method of " + boClass.getName() + " for property " + attributeName);
             }
         }
         return currentClass;
     }
     
     /**
      * This method determines the Class of the elements in the collectionName passed in.
      * 
      * @param boClass Class that the collectionName collection exists in.
      * @param collectionName the name of the collection you want the element class for
      * @return
      */
     public static Class getCollectionElementClass(Class boClass, String collectionName) {
         if (boClass == null) {
             throw new IllegalArgumentException("invalid (null) boClass");
         }
         if (StringUtils.isBlank(collectionName)) {
             throw new IllegalArgumentException("invalid (blank) collectionName");
         }
 
         PropertyDescriptor propertyDescriptor = null;
 
         String[] intermediateProperties = collectionName.split("\\.");
         Class currentClass = boClass;
 
         for (int i = 0; i <intermediateProperties.length; ++i) {
 
             String currentPropertyName = intermediateProperties[i];
             propertyDescriptor = buildSimpleReadDescriptor(currentClass, currentPropertyName);
 
 
                 if (propertyDescriptor != null) {
 
                     Class type = propertyDescriptor.getPropertyType();
                     if (Collection.class.isAssignableFrom(type)) {
 
                         if (getPersistenceStructureService().isPersistable(currentClass)) {
 
                             Map<String, Class> collectionClasses = new HashMap<String, Class>();
                             collectionClasses = getPersistenceStructureService().listCollectionObjectTypes(currentClass);
                             currentClass = collectionClasses.get(currentPropertyName);
 
                         }
                         else {
                             throw new RuntimeException("Can't determine the Class of Collection elements because persistenceStructureService.isPersistable(" + currentClass.getName() + ") returns false.");
                         }
 
                     }
                     else {
 
                         currentClass = propertyDescriptor.getPropertyType();
 
                     }
                 }
             }
 
         return currentClass;
     }
 
     static private Map<String, Map<String, PropertyDescriptor>> cache = new TreeMap<String, Map<String, PropertyDescriptor>>();
 
     /**
      * @param propertyClass
      * @param propertyName
      * @return PropertyDescriptor for the getter for the named property of the given class, if one exists.
      */
     public static PropertyDescriptor buildReadDescriptor(Class propertyClass, String propertyName) {
         if (propertyClass == null) {
             throw new IllegalArgumentException("invalid (null) propertyClass");
         }
         if (StringUtils.isBlank(propertyName)) {
             throw new IllegalArgumentException("invalid (blank) propertyName");
         }
 
         PropertyDescriptor propertyDescriptor = null;
 
         String[] intermediateProperties = propertyName.split("\\.");
         int lastLevel = intermediateProperties.length - 1;
         Class currentClass = propertyClass;
 
         for (int i = 0; i <= lastLevel; ++i) {
 
             String currentPropertyName = intermediateProperties[i];
             propertyDescriptor = buildSimpleReadDescriptor(currentClass, currentPropertyName);
 
             if (i < lastLevel) {
 
                 if (propertyDescriptor != null) {
 
                     Class propertyType = propertyDescriptor.getPropertyType();
                     if ( propertyType.equals( PersistableBusinessObjectExtension.class ) ) {
                         propertyType = getPersistenceStructureService().getBusinessObjectAttributeClass( currentClass, currentPropertyName );                    
                     }
                     if (Collection.class.isAssignableFrom(propertyType)) {
 
                         if (getPersistenceStructureService().isPersistable(currentClass)) {
 
                             Map<String, Class> collectionClasses = new HashMap<String, Class>();
                             collectionClasses = getPersistenceStructureService().listCollectionObjectTypes(currentClass);
                             currentClass = collectionClasses.get(currentPropertyName);
 
                         }
                         else {
 
                             throw new RuntimeException("Can't determine the Class of Collection elements because persistenceStructureService.isPersistable(" + currentClass.getName() + ") returns false.");
 
                         }
 
                     }
                     else {
 
                         currentClass = propertyType;
 
                     }
 
                 }
 
             }
 
         }
 
         return propertyDescriptor;
     }
 
     /**
      * @param propertyClass
      * @param propertyName
      * @return PropertyDescriptor for the getter for the named property of the given class, if one exists.
      */
     public static PropertyDescriptor buildSimpleReadDescriptor(Class propertyClass, String propertyName) {
         if (propertyClass == null) {
             throw new IllegalArgumentException("invalid (null) propertyClass");
         }
         if (StringUtils.isBlank(propertyName)) {
             throw new IllegalArgumentException("invalid (blank) propertyName");
         }
 
         PropertyDescriptor p = null;
 
         // check to see if we've cached this descriptor already. if yes, return true.
         String propertyClassName = propertyClass.getName();
         Map<String, PropertyDescriptor> m = cache.get(propertyClassName);
         if (null != m) {
             p = m.get(propertyName);
             if (null != p) {
                 return p;
             }
         }
 
         // Use PropertyUtils.getPropertyDescriptors instead of manually constructing PropertyDescriptor because of
         // issues with introspection and generic/co-variant return types
         // See https://issues.apache.org/jira/browse/BEANUTILS-340 for more details
 
         PropertyDescriptor[] descriptors = PropertyUtils.getPropertyDescriptors(propertyClass);
         if (ArrayUtils.isNotEmpty(descriptors)) {
             for (PropertyDescriptor descriptor : descriptors) {
                 if (descriptor.getName().equals(propertyName)) {
                     p = descriptor;
                 }
             }
         }
 
         // cache the property descriptor if we found it.
         if (p != null) {
             if (m == null) {
                 m = new TreeMap<String, PropertyDescriptor>();
                 cache.put(propertyClassName, m);
             }
             m.put(propertyName, p);
         }
 
         return p;
     }
 
     public Set<InactivationBlockingMetadata> getAllInactivationBlockingMetadatas(Class blockedClass) {
     	return ddMapper.getAllInactivationBlockingMetadatas(ddIndex, blockedClass);
     }
     
     /**
      * This method gathers beans of type BeanOverride and invokes each one's performOverride() method.
      */
     // KULRICE-4513
     public void performBeanOverrides()
     {
     	Collection<BeanOverride> beanOverrides = ddBeans.getBeansOfType(BeanOverride.class).values();
     	
     	if (beanOverrides.isEmpty()){
     		LOG.info("DataDictionary.performOverrides(): No beans to override");
     	}
 		for (BeanOverride beanOverride : beanOverrides) {
 			
 			Object bean = ddBeans.getBean(beanOverride.getBeanName());
 			beanOverride.performOverride(bean);
 			LOG.info("DataDictionary.performOverrides(): Performing override on bean: " + bean.toString());
 		}
     }
 
 }