/*

  * Copyright 2008-2009 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.workflow.attribute;

 import java.util.ArrayList;

 import java.util.List;

 import java.util.Map;

 import org.kuali.rice.core.util.AttributeSet;

 import org.kuali.rice.kew.engine.RouteContext;

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

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

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

 import org.kuali.rice.kns.document.Document;

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

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

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

 /**

  * QualifierResolver which uses Data Dictionary defined workflow attributes to gather a collection

  * of qualifiers to use to determine the responsibility for a document at a given workflow route node.

  * 

  * WorkflowAttributes can be defined in the data dictionary like so (this has been abbreviated):

  * 

  * <!-- Exported Workflow Attributes -->

  *   <bean id="DisbursementVoucherDocument-workflowAttributes" parent="DisbursementVoucherDocument-workflowAttributes-parentBean"/>

  *

  *   <bean id="DisbursementVoucherDocument-workflowAttributes-parentBean" abstract="true" parent="WorkflowAttributes">

  *       <property name="routingTypeDefinitions">

  *           <map>

  *               <!-- no qualifiers for purchasing node -->

  *               <entry key="Account" value-ref="RoutingType-AccountingDocument-Account-sourceOnly"/>

  *               <entry key="AccountingOrganizationHierarchy" value-ref="RoutingType-AccountingDocument-OrganizationHierarchy-sourceOnly"/>

  *               <entry key="Campus" value-ref="DisbursementVoucherDocument-RoutingType-Campus"/>

  *               <!-- no qualifiers for tax review -->

  *               <!-- no qualifiers for travel review -->

  *               <entry key="PaymentMethod" value-ref="DisbursementVoucherDocument-RoutingType-PaymentMethod"/>

  *               <entry key="Award" value-ref="RoutingType-AccountingDocument-Award"/>

  *           </map>

  *       </property>

  *   </bean>

  * 

  *   <bean id="DisbursementVoucherDocument-RoutingType-PaymentMethod" class="org.kuali.rice.kns.datadictionary.RoutingTypeDefinition">

  *       <property name="routingAttributes">

  *           <list>

  *               <bean class="org.kuali.rice.kns.datadictionary.RoutingAttribute">

  *                   <property name="qualificationAttributeName" value="disbVchrPaymentMethodCode"/>

  *               </bean>

  *           </list>

  *       </property>

  *       <property name="documentValuePathGroups">

  *           <list>

  *               <bean class="org.kuali.rice.kns.datadictionary.DocumentValuePathGroup">

  *                   <property name="documentValues">

  *                       <list>

  *                           <value>disbVchrPaymentMethodCode</value>

  *                       </list>

  *                   </property>

  *               </bean>

  *           </list>

  *       </property>

  *   </bean> 

  * 

  * At the PaymentMethod node of the document, the DisbursementVoucherDocument-RoutingType-PaymentMethod RoutingTypeDefinition will be

  * consulted; it will pull values from the document (in this case, document.disbVchrPaymentMethodCode) and populate those

  * into the role qualifier AttributeSet, with the key being the qualificationAttributeName and the value being the value of the property

  * listed in the documentValuePathGroups in the document.

  */

 public class DataDictionaryQualifierResolver extends QualifierResolverBase {

 //    private static org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(DataDictionaryQualifierResolver.class);

     /**

      * Given the RouteContext, determines the document type of the document being routed and the current

      * route nodes; generates a List of qualifier AttributeSets based on the the contents of the document. 

      * @see org.kuali.rice.kew.role.QualifierResolver#resolve(org.kuali.rice.kew.engine.RouteContext)

      */

     public List<AttributeSet> resolve(RouteContext context) {

         final String routeLevel = context.getNodeInstance().getName();

         final DocumentEntry documentEntry = getDocumentEntry(context);

         final RoutingTypeDefinition routingTypeDefinition = getWorkflowAttributeDefintion(documentEntry, routeLevel);

         final Document document = getDocument(context);

         List<AttributeSet> qualifiers = null;

         if (document != null && routingTypeDefinition != null) {

             qualifiers = KNSServiceLocatorInternal.getWorkflowAttributePropertyResolutionService().resolveRoutingTypeQualifiers(document, routingTypeDefinition);

         } else {

             qualifiers = new ArrayList<AttributeSet>();

             AttributeSet basicQualifier = new AttributeSet();

             qualifiers.add(basicQualifier);

         }

         decorateWithCommonQualifiers(qualifiers, document, documentEntry, routeLevel);

         return qualifiers;

     }

     /**

      * Retrieves the data dictionary entry for the document being operated on by the given route context

      * @param context the current route context

      * @return the data dictionary document entry

      */

     protected DocumentEntry getDocumentEntry(RouteContext context) {

         return KNSServiceLocatorWeb.getDataDictionaryService().getDataDictionary().getDocumentEntry(context.getDocument().getDocumentType().getName());

     }

     /**

      * Retrieves the proper List of WorkflowAttributes for the given route level from the data dictionary

      * document entry

      * @param documentEntry the data dictionary document entry for the currently routed document

      * @param routeLevelName the name of the route level

      * @return a WorkflowAttributeDefinition if one could be found for the route level; otherwise, nothing

      */

     protected RoutingTypeDefinition getWorkflowAttributeDefintion(DocumentEntry documentEntry, String routeLevelName) {

        final WorkflowAttributes workflowAttributes = documentEntry.getWorkflowAttributes();

        if ( workflowAttributes == null ) {

            return null;

        }

        final Map<String, RoutingTypeDefinition> routingTypeMap = workflowAttributes.getRoutingTypeDefinitions();

        if (routingTypeMap.containsKey(routeLevelName)) return routingTypeMap.get(routeLevelName);

        return null;

     }

     /**

      * Add common qualifiers to every AttributeSet in the given List of AttributeSet

      * @param qualifiers a List of AttributeSets to add common qualifiers to

      * @param document the document currently being routed

      * @param documentEntry the data dictionary entry of the type of document currently being routed

      * @param routeLevel the document's current route level

      */

     protected void decorateWithCommonQualifiers(List<AttributeSet> qualifiers, Document document, DocumentEntry documentEntry, String routeLevel) {

         for (AttributeSet qualifier : qualifiers) {

             addCommonQualifiersToAttributeSet(qualifier, document, documentEntry, routeLevel);

         }

     }

     /**

      * Adds common qualifiers to a given AttributeSet

      * @param qualifier an AttributeSet to add common qualifiers to

      * @param document the document currently being routed

      * @param documentEntry the data dictionary entry of the type of document currently being routed

      * @param routeLevel the document's current route level

      */

     protected void addCommonQualifiersToAttributeSet(AttributeSet qualifier, Document document, DocumentEntry documentEntry, String routeLevel) {

         if ( document != null ) {

             qualifier.put(KIM_ATTRIBUTE_DOCUMENT_NUMBER, document.getDocumentNumber());

         }

         if ( documentEntry != null ) {

             qualifier.put(KIM_ATTRIBUTE_DOCUMENT_TYPE_NAME, documentEntry.getDocumentTypeName());

         }

         qualifier.put(KIM_ATTRIBUTE_ROUTE_LEVEL_NAME, routeLevel);

     }

 }