/*

  * Copyright 2007 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.kns.service.impl;

 import java.lang.reflect.InvocationTargetException;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.HashMap;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Map;

 import org.apache.commons.lang.StringUtils;

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

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

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

 import org.kuali.rice.kns.datadictionary.DataDictionaryEntry;

 import org.kuali.rice.kns.datadictionary.FieldDefinition;

 import org.kuali.rice.kns.datadictionary.InquirySectionDefinition;

 import org.kuali.rice.kns.datadictionary.PrimitiveAttributeDefinition;

 import org.kuali.rice.kns.datadictionary.RelationshipDefinition;

 import org.kuali.rice.kns.datadictionary.SupportAttributeDefinition;

 import org.kuali.rice.kns.lookup.valueFinder.ValueFinder;

 import org.kuali.rice.kns.service.BusinessObjectDictionaryService;

 import org.kuali.rice.kns.service.BusinessObjectMetaDataService;

 import org.kuali.rice.kns.service.DataDictionaryService;

 import org.kuali.rice.kns.service.KNSServiceLocator;

 import org.kuali.rice.kns.service.KualiModuleService;

 import org.kuali.rice.kns.service.ModuleService;

 import org.kuali.rice.kns.service.PersistenceStructureService;

 import org.kuali.rice.kns.util.ObjectUtils;

 /**

  *

  * Implementation of the <code>BusinessObjectMetaDataService</code> which uses

  * the following services to gather its meta data:

  *

  * @see BusinessObjectDictionaryService

  * @see DataDictionaryService

  * @see PersistenceStructureService

  */

 public class BusinessObjectMetaDataServiceImpl implements BusinessObjectMetaDataService {

         private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger .getLogger(BusinessObjectMetaDataServiceImpl.class);

         private BusinessObjectDictionaryService businessObjectDictionaryService;

         private DataDictionaryService dataDictionaryService;

         private PersistenceStructureService persistenceStructureService;

         private KualiModuleService kualiModuleService;

         public Collection<String> getCollectionNames(BusinessObject bo) {

                 return dataDictionaryService.getDataDictionary()

                                 .getBusinessObjectEntry(bo.getClass().getName())

                                 .getCollectionNames();

         }

         public Collection<String> getInquirableFieldNames(Class boClass,

                         String sectionTitle) {

                 return businessObjectDictionaryService.getInquiryFieldNames(boClass,

                                 sectionTitle);

         }

         public List<String> getLookupableFieldNames(Class boClass) {

                 return businessObjectDictionaryService.getLookupFieldNames(boClass);

         }

         public String getLookupFieldDefaultValue(Class businessObjectClass,

                         String attributeName) {

                 return businessObjectDictionaryService.getLookupFieldDefaultValue(

                                 businessObjectClass, attributeName);

         }

         public Class getLookupFieldDefaultValueFinderClass(

                         Class businessObjectClass, String attributeName) {

                 return businessObjectDictionaryService

                                 .getLookupFieldDefaultValueFinderClass(businessObjectClass,

                                                 attributeName);

         }

         /** {@inheritDoc} */

         public String getLookupFieldQuickfinderParameterString(Class businessObjectClass,

                         String attributeName) {

                 return businessObjectDictionaryService.getLookupFieldQuickfinderParameterString(

                                 businessObjectClass, attributeName);

         }

         /** {@inheritDoc} */

         public Class<? extends ValueFinder> getLookupFieldQuickfinderParameterStringBuilderClass(

                         Class businessObjectClass, String attributeName) {

                 return businessObjectDictionaryService

                                 .getLookupFieldQuickfinderParameterStringBuilderClass(businessObjectClass,

                                                 attributeName);

         }

         public boolean isAttributeInquirable(Class boClass, String attributeName,

                         String sectionTitle) {

                 Collection sections = businessObjectDictionaryService

                                 .getInquirySections(boClass);

                 boolean isInquirable = true;

                 Iterator iter = sections.iterator();

                 while (iter.hasNext()) {

                         InquirySectionDefinition def = (InquirySectionDefinition) iter

                                         .next();

                         for (FieldDefinition field : def.getInquiryFields()) {

                                 if (field.getAttributeName().equalsIgnoreCase(attributeName)) {

                                         isInquirable = !field.isNoInquiry();

                                 }

                         }

                 }

                 if (isInquirable) {

                         Object obj = null;

                         if (boClass != null

                                         && BusinessObject.class.isAssignableFrom(boClass)) {

                                 obj = ObjectUtils.createNewObjectFromClass(boClass);

                         }

                         if (obj != null) {

                                 BusinessObject bo = (BusinessObject) obj;

                                 Class clazz = getNestedBOClass(bo, attributeName);

                                 if (clazz != null

                                                 && BusinessObject.class.isAssignableFrom(clazz)) {

                                         return businessObjectDictionaryService.isInquirable(clazz);

                                 } else {

                                         return false;

                                 }

                         } else {

                                 return false;

                         }

                 }

                 return isInquirable;

         }

         public boolean isInquirable(Class boClass) {

                 boolean inquirable = false;

                 ModuleService moduleService = kualiModuleService

                                 .getResponsibleModuleService(boClass);

                 if (moduleService != null && moduleService.isExternalizable(boClass)) {

                         inquirable = moduleService

                                         .isExternalizableBusinessObjectInquirable(boClass);

                 } else {

                         Boolean isLookupable = businessObjectDictionaryService

                                         .isInquirable(boClass);

                         if (isLookupable != null) {

                                 inquirable = isLookupable.booleanValue();

                         }

                 }

                 return inquirable;

         }

         public boolean isAttributeLookupable(Class boClass, String attributeName) {

                 Object obj = null;

                 if (boClass != null && BusinessObject.class.isAssignableFrom(boClass)) {

                         obj = ObjectUtils.createNewObjectFromClass(boClass);

                 }

                 if (obj != null) {

                         BusinessObject bo = (BusinessObject) obj;

                         BusinessObjectRelationship relationship = getBusinessObjectRelationship(

                                         bo, attributeName);

                         if (relationship != null

                                         && relationship.getRelatedClass() != null

                                         && BusinessObject.class.isAssignableFrom(relationship

                                                         .getRelatedClass())) {

                                 return isLookupable(relationship.getRelatedClass());

                         } else {

                                 return false;

                         }

                 } else {

                         return false;

                 }

         }

         public boolean isLookupable(Class boClass) {

                 boolean lookupable = false;

                 ModuleService moduleService = kualiModuleService

                                 .getResponsibleModuleService(boClass);

                 if (moduleService != null && moduleService.isExternalizable(boClass)) {

                         lookupable = moduleService

                                         .isExternalizableBusinessObjectLookupable(boClass);

                 } else {

                         Boolean isLookupable = businessObjectDictionaryService

                                         .isLookupable(boClass);

                         if (isLookupable != null) {

                                 lookupable = isLookupable.booleanValue();

                         }

                 }

                 return lookupable;

         }

         public BusinessObjectRelationship getBusinessObjectRelationship(

                         BusinessObject bo, String attributeName) {

                 return getBusinessObjectRelationship(bo, bo.getClass(), attributeName,

                                 "", true);

         }

         //TODO: four different exit points?!

         public BusinessObjectRelationship getBusinessObjectRelationship(

                         RelationshipDefinition ddReference, BusinessObject bo,

                         Class boClass, String attributeName, String attributePrefix,

                         boolean keysOnly) {

                 BusinessObjectRelationship relationship = null;

                 // if it is nested then replace the bo and attributeName with the

                 // sub-refs

                 if (ObjectUtils.isNestedAttribute(attributeName)) {

                         if (ddReference != null) {

                                 relationship = new BusinessObjectRelationship(boClass,

                                                 ddReference.getObjectAttributeName(), ddReference

                                                                 .getTargetClass());

                                 for (PrimitiveAttributeDefinition def : ddReference

                                                 .getPrimitiveAttributes()) {

                                         if (StringUtils.isNotBlank(attributePrefix)) {

                                                 relationship.getParentToChildReferences().put(

                                                                 attributePrefix + "." + def.getSourceName(),

                                                                 def.getTargetName());

                                         } else {

                                                 relationship.getParentToChildReferences().put(

                                                                 def.getSourceName(), def.getTargetName());

                                         }

                                 }

                                 if (!keysOnly) {

                                         for (SupportAttributeDefinition def : ddReference

                                                         .getSupportAttributes()) {

                                                 if (StringUtils.isNotBlank(attributePrefix)) {

                                                         relationship.getParentToChildReferences()

                                                                         .put(

                                                                                         attributePrefix + "."

                                                                                                         + def.getSourceName(),

                                                                                         def.getTargetName());

                                                         if (def.isIdentifier()) {

                                                                 relationship

                                                                                 .setUserVisibleIdentifierKey(attributePrefix

                                                                                                 + "." + def.getSourceName());

                                                         }

                                                 } else {

                                                         relationship.getParentToChildReferences().put(

                                                                         def.getSourceName(), def.getTargetName());

                                                         if (def.isIdentifier()) {

                                                                 relationship.setUserVisibleIdentifierKey(def

                                                                                 .getSourceName());

                                                         }

                                                 }

                                         }

                                 }

                                 return relationship;

                         }

                         // recurse down to the next object to find the relationship

                         String localPrefix = StringUtils

                                         .substringBefore(attributeName, ".");

                         String localAttributeName = StringUtils.substringAfter(

                                         attributeName, ".");

                         if (bo == null) {

                                 bo = (BusinessObject) ObjectUtils

                                                 .createNewObjectFromClass(boClass);

                         }

                         Class nestedClass = ObjectUtils.getPropertyType(bo, localPrefix,

                                         getPersistenceStructureService());

                         String fullPrefix = localPrefix;

                         if (StringUtils.isNotBlank(attributePrefix)) {

                                 fullPrefix = attributePrefix + "." + localPrefix;

                         }

                         if (BusinessObject.class.isAssignableFrom(nestedClass)) {

                                 relationship = getBusinessObjectRelationship(null, nestedClass,

                                                 localAttributeName, fullPrefix, keysOnly);

                         }

                         return relationship;

                 }

                 int maxSize = Integer.MAX_VALUE;

                 // try persistable reference first

                 if (PersistableBusinessObject.class.isAssignableFrom(boClass) && persistenceStructureService.isPersistable(boClass) ) {

                         Map<String, BusinessObjectRelationship> rels = persistenceStructureService

                                         .getRelationshipMetadata(boClass, attributeName,

                                                         attributePrefix);

                         if (rels.size() > 0) {

                                 for (BusinessObjectRelationship rel : rels.values()) {

                                         if (rel.getParentToChildReferences().size() < maxSize

                                                         && isLookupable(rel.getRelatedClass())) {

                                                 maxSize = rel.getParentToChildReferences().size();

                                                 relationship = rel;

                                         }

                                 }

                         }

                 } else {

                         ModuleService moduleService = KNSServiceLocator.getKualiModuleService().getResponsibleModuleService(boClass);

                         if(moduleService!=null && moduleService.isExternalizable(boClass)){

                                 relationship = getRelationshipMetadata(boClass, attributeName, attributePrefix);

                                 //relationship = moduleService.getBusinessObjectRelationship(boClass, attributeName, attributePrefix);

                                 if(relationship!=null) {

                                         return relationship;

                                 }

                         }

                 }

                 // then check the DD for relationships defined there

                 // TODO move out to a separate method

                 // so that the logic for finding the relationships is similar to

                 // primitiveReference

                 if (ddReference != null

                                 && isLookupable(ddReference.getTargetClass())

                                 && bo != null

                                 && ddReference.getPrimitiveAttributes().size() < maxSize ) {

                         relationship = new BusinessObjectRelationship(boClass,

                                 ddReference.getObjectAttributeName(), ddReference

                                                 .getTargetClass());

                         for (PrimitiveAttributeDefinition def : ddReference

                                         .getPrimitiveAttributes()) {

                                 relationship.getParentToChildReferences().put(

                                                 def.getSourceName(), def.getTargetName());

                         }

                         if (!keysOnly) {

                                 for (SupportAttributeDefinition def : ddReference

                                                 .getSupportAttributes()) {

                                         relationship.getParentToChildReferences().put(

                                                         def.getSourceName(), def.getTargetName());

                                 }

                         }

                 }

                 return relationship;

         }

         public RelationshipDefinition getBusinessObjectRelationshipDefinition(

                         Class c, String attributeName) {

                 return getDDRelationship(c, attributeName);

         }

         public RelationshipDefinition getBusinessObjectRelationshipDefinition(

                         BusinessObject bo, String attributeName) {

                 return getBusinessObjectRelationshipDefinition(bo.getClass(),

                                 attributeName);

         }

         public BusinessObjectRelationship getBusinessObjectRelationship(

                         BusinessObject bo, Class boClass, String attributeName,

                         String attributePrefix, boolean keysOnly) {

                 RelationshipDefinition ddReference = getBusinessObjectRelationshipDefinition(

                                 boClass, attributeName);

                 return getBusinessObjectRelationship(ddReference, bo, boClass,

                                 attributeName, attributePrefix, keysOnly);

         }

         /**

          * Gets the dataDictionaryService attribute.

          *

          * @return Returns the dataDictionaryService.

          */

         public DataDictionaryService getDataDictionaryService() {

                 return dataDictionaryService;

         }

         /**

          * Sets the dataDictionaryService attribute value.

          *

          * @param dataDictionaryService

          *            The dataDictionaryService to set.

          */

         public void setDataDictionaryService(

                         DataDictionaryService dataDictionaryService) {

                 this.dataDictionaryService = dataDictionaryService;

         }

         /**

          * Gets the businessObjectDictionaryService attribute.

          *

          * @return Returns the businessObjectDictionaryService.

          */

         public BusinessObjectDictionaryService getBusinessObjectDictionaryService() {

                 return businessObjectDictionaryService;

         }

         /**

          * Sets the businessObjectDictionaryService attribute value.

          *

          * @param businessObjectDictionaryService

          *            The BusinessObjectDictionaryService to set.

          */

         public void setBusinessObjectDictionaryService(

                         BusinessObjectDictionaryService businessObjectDictionaryService) {

                 this.businessObjectDictionaryService = businessObjectDictionaryService;

         }

         /**

          * Gets the persistenceStructureService attribute.

          *

          * @return Returns the persistenceStructureService.

          */

         public PersistenceStructureService getPersistenceStructureService() {

                 return persistenceStructureService;

         }

         /**

          * Sets the persistenceStructureService attribute value.

          *

          * @param persistenceStructureService

          *            The persistenceStructureService to set.

          */

         public void setPersistenceStructureService(

                         PersistenceStructureService persistenceStructureService) {

                 this.persistenceStructureService = persistenceStructureService;

         }

         /**

          *

          * This method retrieves the business object class for a specific attribute

          *

          * @param bo

          * @param attributeName

          * @return a business object class for a specific attribute

          */

         private Class getNestedBOClass(BusinessObject bo, String attributeName) {

                 String[] nestedAttributes = StringUtils.split(attributeName, ".");

                 String attributeRefName = "";

                 Class clazz = null;

                 if (nestedAttributes.length > 1) {

                         String attributeStringSoFar = "";

                         for (int i = 0; i < nestedAttributes.length - 1; i++) {

                                 try {

                                         // we need to build a string of the attribute names

                                         // depending on which iteration we're in.

                                         // so if the original attributeName string we're using is

                                         // "a.b.c.d.e", then first iteration would use

                                         // "a", 2nd "a.b", 3rd "a.b.c", etc.

                                         if (i != 0) {

                                                 attributeStringSoFar = attributeStringSoFar + ".";

                                         }

                                         attributeStringSoFar = attributeStringSoFar

                                                         + nestedAttributes[i];

                                         clazz = ObjectUtils.easyGetPropertyType(bo,

                                                         attributeStringSoFar);

                                 } catch (InvocationTargetException ite) {

                                         LOG.info(ite);

                                         return null;

                                 } catch (NoSuchMethodException nsme) {

                                         LOG.info(nsme);

                                         return null;

                                 } catch (IllegalAccessException iae) {

                                         LOG.info(iae);

                                         return null;

                                 }

                         }

                 }

                 return clazz;

         }

         public RelationshipDefinition getDDRelationship(Class c,

                         String attributeName) {

                 DataDictionaryEntry entryBase = dataDictionaryService

                                 .getDataDictionary().getDictionaryObjectEntry(c.getName());

                 if (entryBase == null) {

                         return null;

                 }

                 List<RelationshipDefinition> ddRelationships = entryBase

                                 .getRelationships();

                 RelationshipDefinition relationship = null;

                 int minKeys = Integer.MAX_VALUE;

                 for (RelationshipDefinition def : ddRelationships) {

                         // favor key sizes of 1 first

                         if (def.getPrimitiveAttributes().size() == 1) {

                                 for (PrimitiveAttributeDefinition primitive : def

                                                 .getPrimitiveAttributes()) {

                                         if (primitive.getSourceName().equals(attributeName)

                                                         || def.getObjectAttributeName().equals(

                                                                         attributeName)) {

                                                 relationship = def;

                                                 minKeys = 1;

                                                 break;

                                         }

                                 }

                         } else if (def.getPrimitiveAttributes().size() < minKeys) {

                                 for (PrimitiveAttributeDefinition primitive : def

                                                 .getPrimitiveAttributes()) {

                                         if (primitive.getSourceName().equals(attributeName)

                                                         || def.getObjectAttributeName().equals(

                                                                         attributeName)) {

                                                 relationship = def;

                                                 minKeys = def.getPrimitiveAttributes().size();

                                                 break;

                                         }

                                 }

                         }

                 }

                 // check the support attributes

                 if (relationship == null) {

                         for (RelationshipDefinition def : ddRelationships) {

                                 if (def.hasIdentifier()) {

                                         if (def.getIdentifier().getSourceName().equals(

                                                         attributeName)) {

                                                 relationship = def;

                                         }

                                 }

                         }

                 }

                 return relationship;

         }

         public List<BusinessObjectRelationship> getBusinessObjectRelationships( BusinessObject bo ) {

                 if ( bo == null ) {

                         return null;

                 }

                 return getBusinessObjectRelationships( bo.getClass() );

         }

         @SuppressWarnings("unchecked")

         public List<BusinessObjectRelationship> getBusinessObjectRelationships( Class<? extends BusinessObject> boClass) {

                 if (boClass == null) {

                         return null;

                 }

                 Map<String, Class> referenceClasses = null;

                 if (PersistableBusinessObject.class.isAssignableFrom( boClass ) && getPersistenceStructureService().isPersistable(boClass)) {

                         referenceClasses = getPersistenceStructureService().listReferenceObjectFields(boClass);

                 }

                 DataDictionaryEntry ddEntry = dataDictionaryService.getDataDictionary().getDictionaryObjectEntry(boClass.getName());

                 List<RelationshipDefinition> ddRelationships = (ddEntry == null ? new ArrayList<RelationshipDefinition>() : ddEntry.getRelationships());

                 List<BusinessObjectRelationship> relationships = new ArrayList<BusinessObjectRelationship>();

                 // loop over all relationships

                 if (referenceClasses != null) {

                         for (Map.Entry<String, Class> entry : referenceClasses.entrySet()) {

                                 if (isLookupable(entry.getValue())) {

                                         Map<String, String> fkToPkRefs = persistenceStructureService.getForeignKeysForReference(boClass, entry.getKey());

                                         BusinessObjectRelationship rel = new BusinessObjectRelationship( boClass, entry.getKey(), entry.getValue() );

                                         for (Map.Entry<String, String> ref : fkToPkRefs.entrySet()) {

                                                 rel.getParentToChildReferences().put(ref.getKey(), ref.getValue());

                                         }

                                         relationships.add(rel);

                                 }

                         }

                 }

                 for (RelationshipDefinition rd : ddRelationships) {

                         if (isLookupable(rd.getTargetClass())) {

                                 BusinessObjectRelationship rel = new BusinessObjectRelationship( boClass, rd.getObjectAttributeName(), rd.getTargetClass());

                                 for (PrimitiveAttributeDefinition def : rd.getPrimitiveAttributes()) {

                                         rel.getParentToChildReferences().put(def.getSourceName(),def.getTargetName());

                                 }

                                 relationships.add(rel);

                         }

                 }

                 return relationships;

         }

         /***************************************************************************

          * @see org.kuali.rice.kns.service.BusinessObjectMetaDataService#getReferencesForForeignKey(java.lang.Class,

          *      java.lang.String)

          */

         public Map<String, Class> getReferencesForForeignKey(BusinessObject bo,

                         String attributeName) {

                 List<BusinessObjectRelationship> businessObjectRelationships = getBusinessObjectRelationships(bo);

                 Map<String, Class> referencesForForeignKey = new HashMap<String, Class>();

                 for (BusinessObjectRelationship businessObjectRelationship : businessObjectRelationships) {

                         if (businessObjectRelationship != null

                                         && businessObjectRelationship.getParentToChildReferences() != null

                                         && businessObjectRelationship.getParentToChildReferences()

                                                         .containsKey(attributeName)) {

                                 referencesForForeignKey.put(businessObjectRelationship

                                                 .getParentAttributeName(), businessObjectRelationship

                                                 .getRelatedClass());

                         }

                 }

                 return referencesForForeignKey;

         }

         /***

          * @see org.kuali.core.service.BusinessObjectMetaDataService#listPrimaryKeyFieldNames(java.lang.Class)

          */

         public List listPrimaryKeyFieldNames(Class clazz) {

                 if (persistenceStructureService.isPersistable(clazz)) {

                         return persistenceStructureService.listPrimaryKeyFieldNames(clazz);

                 }

                 ModuleService responsibleModuleService = getKualiModuleService()

                                 .getResponsibleModuleService(clazz);

                 if (responsibleModuleService != null

                                 && responsibleModuleService.isExternalizable(clazz))

                         return responsibleModuleService.listPrimaryKeyFieldNames(clazz);

                 // give the option to declare primary keys in the dd.

                 // this is primarly used for transient objects that lack db persistence.

                 List<String> pks = dataDictionaryService.getDataDictionary()

                         .getBusinessObjectEntry(clazz.getName()).getPrimaryKeys();

                 if(pks != null && !pks.isEmpty())

                         return pks;

                 return new ArrayList();

         }

         public KualiModuleService getKualiModuleService() {

                 return this.kualiModuleService;

         }

         public void setKualiModuleService(KualiModuleService kualiModuleService) {

                 this.kualiModuleService = kualiModuleService;

         }

         public BusinessObjectRelationship getRelationshipMetadata(

                         Class businessObjectClass, String attributeName, String attributePrefix) {

                 RelationshipDefinition relationshipDefinition = getDDRelationship(businessObjectClass, attributeName);

                 if(relationshipDefinition==null) return null;

                 BusinessObjectRelationship businessObjectRelationship =

                         new BusinessObjectRelationship(relationshipDefinition.getSourceClass(),

                                         relationshipDefinition.getObjectAttributeName(), relationshipDefinition.getTargetClass());

                 if(!StringUtils.isEmpty(attributePrefix))

                         attributePrefix += ".";

                 List<PrimitiveAttributeDefinition> primitives = relationshipDefinition.getPrimitiveAttributes();

                 for(PrimitiveAttributeDefinition primitiveAttributeDefinition: primitives){

                         businessObjectRelationship.getParentToChildReferences().put(

                                         attributePrefix+primitiveAttributeDefinition.getSourceName(), primitiveAttributeDefinition.getTargetName());

                 }

                 /*List<SupportAttributeDefinition> supports = relationshipDefinition.getSupportAttributes();

                 for(SupportAttributeDefinition supportAttributeDefinition: supports){

                         rel.getParentToChildReferences().put(

                                         supportAttributeDefinition.getSourceName(), supportAttributeDefinition.getTargetName());

                 }*/

                 return businessObjectRelationship;

         }

         public String getForeignKeyFieldName(Class businessObjectClass, String attributeName, String targetName) {

                 String fkName = "";

                 // first try DD-based relationships

                 RelationshipDefinition relationshipDefinition = getDDRelationship(businessObjectClass, attributeName);

                 if(relationshipDefinition!=null){

                         List<PrimitiveAttributeDefinition> primitives = relationshipDefinition.getPrimitiveAttributes();

                         for(PrimitiveAttributeDefinition primitiveAttributeDefinition: primitives){

                                 if(primitiveAttributeDefinition.getTargetName().equals(targetName)){

                                         fkName = primitiveAttributeDefinition.getSourceName();

                                         break;

                                 }

                         }

                 }

                 // if we can't find anything in the DD, then try the persistence service

                 if(StringUtils.isBlank(fkName) && PersistableBusinessObject.class.isAssignableFrom(businessObjectClass) && getPersistenceStructureService().isPersistable(businessObjectClass)) {

                         fkName =

                                 getPersistenceStructureService().getForeignKeyFieldName(businessObjectClass, attributeName, targetName);

                 }

                 return fkName;

         }

 }