/*

  * Copyright 2005-2007 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.kew.doctype.service.impl;

 import java.io.InputStream;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.Iterator;

 import java.util.List;

 import org.apache.commons.collections.CollectionUtils;

 import org.jdom.Element;

 import org.kuali.rice.core.api.impex.ExportDataSet;

 import org.kuali.rice.kew.doctype.bo.DocumentType;

 import org.kuali.rice.kew.doctype.dao.DocumentTypeDAO;

 import org.kuali.rice.kew.doctype.service.DocumentTypePermissionService;

 import org.kuali.rice.kew.doctype.service.DocumentTypeService;

 import org.kuali.rice.kew.exception.WorkflowServiceErrorException;

 import org.kuali.rice.kew.exception.WorkflowServiceErrorImpl;

 import org.kuali.rice.kew.rule.bo.RuleAttribute;

 import org.kuali.rice.kew.service.KEWServiceLocator;

 import org.kuali.rice.kew.xml.DocumentTypeXmlParser;

 import org.kuali.rice.kew.xml.export.DocumentTypeXmlExporter;

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

 import org.kuali.rice.ksb.api.KsbApiServiceLocator;

 /**

  * The standard implementation of the DocumentTypeService.

  *

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class DocumentTypeServiceImpl implements DocumentTypeService {

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

     protected static final String XML_FILE_PARSE_ERROR = "general.error.parsexml";

     public static final String DOCUMENT_TYPE_ID_CACHE_GROUP = "DocumentTypeId";

     public static final String DOCUMENT_TYPE_NAME_CACHE_GROUP = "DocumentTypeName";

     public static final String DOCUMENT_TYPE_ID_CACHE_PREFIX = DOCUMENT_TYPE_ID_CACHE_GROUP + ":";

     public static final String DOCUMENT_TYPE_NAME_CACHE_PREFIX = DOCUMENT_TYPE_NAME_CACHE_GROUP + ":";

     public static final String CURRENT_ROOTS_IN_CACHE_KEY = "DocumentType:CurrentRootsInCache";

     private DocumentTypeDAO documentTypeDAO;

     public Collection<DocumentType> find(DocumentType documentType, String docTypeParentName, boolean climbHierarchy) {

         DocumentType docTypeParent = this.findByName(docTypeParentName);

         Collection<DocumentType> documentTypes = getDocumentTypeDAO().find(documentType, docTypeParent, climbHierarchy);

         //since we're here put them in the cache

         for (Object documentType1 : documentTypes)

         {

             insertIntoCache((DocumentType) documentType1);

         }

         return documentTypes;

     }

     public DocumentType findById(String documentTypeId) {

             if (documentTypeId == null) {

                     return null;

             }

             DocumentType documentType = fetchFromCacheById(documentTypeId);

             if (documentType == null) {

                     documentType = getDocumentTypeDAO().findById(documentTypeId);

                     insertIntoCache(documentType);

             }

         return documentType;

     }

     public DocumentType findByDocumentId(String documentId) {

             if (documentId == null) {

                     return null;

             }

             String documentTypeId = getDocumentTypeDAO().findDocumentTypeIdByDocumentId(documentId);

             return findById(documentTypeId);

     }

     public DocumentType findByName(String name) {

             return this.findByName(name, true, true);

     }

     public DocumentType findByNameCaseInsensitive(String name) {

             return this.findByName(name, false,true);

     }

     /**

      * 

      * This method seaches for a DocumentType by document name.

      * 

      * @param name

      * @param caseSensitive

      * @deprecated Use findByName(String name, boolean caseSensitive, boolean checkCache)

      * @return

      */

     protected DocumentType findByName(String name, boolean caseSensitive) {

             if (name == null) {

                     return null;

             }

             DocumentType documentType = fetchFromCacheByName(name);

         if (documentType == null) {

                 documentType = getDocumentTypeDAO().findByName(name, caseSensitive);

                 insertIntoCache(documentType);

         }

             return documentType;

     }

     /**

      * 

      * This method seaches for a DocumentType by document name.

      * 

      * @param name DocumentType name

      * @param caseSensitive If false, case will be ignored

      * @param checkCache if false the cache will not be checked.

      * @return

      */

     protected DocumentType findByName(String name, boolean caseSensitive, boolean checkCache) {

             if (name == null) {

                     return null;

             }

             DocumentType documentType = null;

             if(checkCache){

                     documentType = fetchFromCacheByName(name);

             }

         if (documentType == null) {

                 documentType = getDocumentTypeDAO().findByName(name, caseSensitive);

                 insertIntoCache(documentType);

         }

             return documentType;

     }

     /**

      * Fetches the DocumentType from the cache with the given document type name.  If there is no entry in the cache for the given

      * document type name, null is returned.

      */

     protected DocumentType fetchFromCacheByName(String documentTypeName) {

             return (DocumentType) KsbApiServiceLocator.getCacheAdministrator().getFromCache(getNameCacheKey(documentTypeName));

     }

     /**

      * Fetches the DocumentType from the cache with the given document type id.  If there is no entry in the cache for the given

      * document type id, null is returned.

      */

     protected DocumentType fetchFromCacheById(String documentTypeId) {

             return (DocumentType) KsbApiServiceLocator.getCacheAdministrator().getFromCache(getIdCacheKey(documentTypeId));

     }

     /**

      * Returns the cache key for the given document type ID.

      */

     protected String getIdCacheKey(String documentTypeId) {

             return DOCUMENT_TYPE_ID_CACHE_PREFIX + documentTypeId;

     }

     /**

      * Returns the cache key for the given document type name.

      */

     protected String getNameCacheKey(String documentTypeName) {

             return DOCUMENT_TYPE_NAME_CACHE_PREFIX + documentTypeName;

     }

     /**

      * Inserts the given DocumentType into the name and id caches.  If the DocumentType is already in the cache,

      * these entries should  be overwritten.

      *

      * <p>If the given DocumentType does not represent the current version of the DocumentType then it

      * should not be inserted into the name cache.  This is because different versions of DocumentTypes have

      * different IDs but they all have the same name.  We want only the most recent version of the DocumentType

      * to be cached by name.

      */

     protected void insertIntoCache(DocumentType documentType) {

             if (documentType == null) {

                     return;

             }

             //don't cache by name if this isn't the current version

             if (documentType.getCurrentInd().booleanValue()) {

                     KsbApiServiceLocator.getCacheAdministrator().putInCache(getNameCacheKey(documentType.getName()), documentType, DOCUMENT_TYPE_NAME_CACHE_GROUP);

             }

             KsbApiServiceLocator.getCacheAdministrator().putInCache(getIdCacheKey(documentType.getDocumentTypeId()), documentType, DOCUMENT_TYPE_ID_CACHE_GROUP);

     }

     /**

      * Flushes all DocumentTypes from the cache.

      */

     public void flushCache() {

             // invalidate locally because if we're doing an upload of a document hierarchy we can't wait the 5 secs for this nodes cache

                 //to be accurate-the data going in the db depends on it being accurate now.  This means the cache will be cleared multiple times

             //over during an upload and the subsequent notification to this node.

             LOG.info("clearing DocumentType cache because of local update");

             KsbApiServiceLocator.getCacheAdministrator().flushGroup(DOCUMENT_TYPE_ID_CACHE_GROUP);

             KsbApiServiceLocator.getCacheAdministrator().flushGroup(DOCUMENT_TYPE_NAME_CACHE_GROUP);

             KsbApiServiceLocator.getCacheAdministrator().flushGroup(DocumentTypePermissionService.DOC_TYPE_PERM_CACHE_GROUP);

             KsbApiServiceLocator.getCacheAdministrator().flushEntry(CURRENT_ROOTS_IN_CACHE_KEY);

     }

     public void clearCacheForAttributeUpdate(RuleAttribute ruleAttribute) {

             if (ruleAttribute.getRuleAttributeId() != null) {

                     List documentTypeAttributes = this.documentTypeDAO.findDocumentTypeAttributes(ruleAttribute);

                     if (documentTypeAttributes.size() != 0) {

                             flushCache();

                     }

             }

     }

     public void versionAndSave(DocumentType documentType) {

             try {

                     // at this point this save is designed to version the document type by creating an entire new record if this is going to be an update and

                     // not a create just throw and exception to be on the safe side

                     if (documentType.getDocumentTypeId() != null && documentType.getVersionNumber() != null) {

                             throw new RuntimeException("DocumentType configured for update and not versioning which we support");

                     }

                     // grab the old document. Don't Use Cached Version!

                     DocumentType oldDocumentType = findByName(documentType.getName(), true, false);

                     // reset the children on the oldDocumentType

                     //oldDocumentType.resetChildren();

                     String existingDocTypeId = null;

                     if (oldDocumentType != null) {

                             existingDocTypeId = oldDocumentType.getDocumentTypeId();

                             // set version number on the new doc type using the max version from the database

                             Integer maxVersionNumber = documentTypeDAO.getMaxVersionNumber(documentType.getName());

                             documentType.setVersion((maxVersionNumber != null) ? new Integer(maxVersionNumber.intValue() + 1) : new Integer(0));

                             oldDocumentType.setCurrentInd(Boolean.FALSE);

                             if ( LOG.isInfoEnabled() ) { 

                                     LOG.info("Saving old document type Id " + oldDocumentType.getDocumentTypeId() + " name '" + oldDocumentType.getName() + "' (current = " + oldDocumentType.getCurrentInd() + ")");

                             }

                             save(oldDocumentType, false);

                     }

                     // check to see that no current documents exist in database

                     if (!CollectionUtils.isEmpty(documentTypeDAO.findAllCurrentByName(documentType.getName()))) {

                         String errorMsg = "Found invalid 'current' document with name '" + documentType.getName() + "'.  None should exist.";

                         LOG.error(errorMsg);

                         throw new RuntimeException(errorMsg);

                     }

             // set up the previous current doc type on the new doc type

             documentType.setPreviousVersionId(existingDocTypeId);

             documentType.setCurrentInd(Boolean.TRUE);

                     save(documentType, false);

                     if ( LOG.isInfoEnabled() ) { 

                             LOG.info("Saved current document type Id " + documentType.getDocumentTypeId() + " name '" + documentType.getName() + "' (current = " + documentType.getCurrentInd() + ")");

                     }

                     //attach the children to this new parent.  cloning the children would probably be a better way to go here...

                     if (ObjectUtils.isNotNull(existingDocTypeId)) {

                         // documentType.getPreviousVersion() should not be null at this point

                 for (Iterator iterator = getChildDocumentTypes(existingDocTypeId).iterator(); iterator.hasNext();) {

 //                            for (Iterator iterator = oldDocumentType.getChildrenDocTypes().iterator(); iterator.hasNext();) {

                                     DocumentType child = (DocumentType) iterator.next();

                                     child.setDocTypeParentId(documentType.getDocumentTypeId());

                                     save(child, false);

                                     if ( LOG.isInfoEnabled() ) { 

                                             LOG.info("Saved child document type Id " + child.getDocumentTypeId() + " name '" + child.getName() + "' (parent = " + child.getDocTypeParentId() + ", current = " + child.getCurrentInd() + ")");

                                     }

                             }

                     }

                     // initiate a save of this document type's parent document type, this will force a

                     // version check which should reveal (via an optimistic lock exception) whether or

                     // not there is a concurrent transaction

                     // which has modified the parent (and therefore made it non-current)

                     // be sure to get the parent doc type directly from the db and not from the cache

                     if (documentType.getDocTypeParentId() != null) {

                             DocumentType parent = getDocumentTypeDAO().findById(documentType.getDocTypeParentId());

                             save(parent, false);

                             if ( LOG.isInfoEnabled() ) { 

                                     LOG.info("Saved parent document type Id " + parent.getDocumentTypeId() + " name '" + parent.getName() + "' (current = " + parent.getCurrentInd() + ")");

                             }

                     }

                     // finally, flush the cache and notify the rule cache of the DocumentType change

                     flushCache();

                     KEWServiceLocator.getRuleService().notifyCacheOfDocumentTypeChange(documentType);

             } finally {

                     // the double flush here is necessary because of a series of events which occur inside of

                     // notifyCacheOfDocumentTypeChange, see the documentation inside that service method for

                     // more information on the problem.  Essentially, the method ends up invoking methods on

                     // this service which re-cache document types, however the document types that get

                     // re-cached are ones pulled from the OJB cache that don't have the proper children

                     // on them

                     //

                     // also we flush in the finally block because if an exception is thrown then it's still possible

                     // the the "oldDocumentType" which was fetched from the cache has had it's dbLockVerNbr incremented

                     flushCache();

             }

     }

     public void save(DocumentType documentType, boolean flushCache) {

             getDocumentTypeDAO().save(documentType);

             if (flushCache) {

                     // always clear the entire cache

                     flushCache();

                 KEWServiceLocator.getRuleService().notifyCacheOfDocumentTypeChange(documentType);

                 flushCache();

             }

     }

     public void save(DocumentType documentType) {

             save(documentType, true);

     }

     public DocumentTypeDAO getDocumentTypeDAO() {

         return documentTypeDAO;

     }

     public void setDocumentTypeDAO(DocumentTypeDAO documentTypeDAO) {

         this.documentTypeDAO = documentTypeDAO;

     }

     public synchronized List findAllCurrentRootDocuments() {

             List currentRootsInCache = (List) KsbApiServiceLocator.getCacheAdministrator().getFromCache(CURRENT_ROOTS_IN_CACHE_KEY);

             //we can do this because we whack the entire cache when a new document type comes into the picture.

             if (currentRootsInCache == null) {

                     currentRootsInCache = getDocumentTypeDAO().findAllCurrentRootDocuments();

                     KsbApiServiceLocator.getCacheAdministrator().putInCache(CURRENT_ROOTS_IN_CACHE_KEY, currentRootsInCache);

             }

             return currentRootsInCache;

     }

     public List findAllCurrent() {

         return getDocumentTypeDAO().findAllCurrent();

     }

     public List<DocumentType> findPreviousInstances(String documentTypeName) {

         return getDocumentTypeDAO().findPreviousInstances(documentTypeName);

     }

     public DocumentType findRootDocumentType(DocumentType docType) {

         if (docType.getParentDocType() != null) {

             return findRootDocumentType(docType.getParentDocType());

         } else {

             return docType;

         }

     }

     public void loadXml(InputStream inputStream, String principalId) {

         DocumentTypeXmlParser parser = new DocumentTypeXmlParser();

         try {

             parser.parseDocumentTypes(inputStream);

         } catch (Exception e) {

             WorkflowServiceErrorException wsee = new WorkflowServiceErrorException("Error parsing documentType XML file", new WorkflowServiceErrorImpl("Error parsing documentType XML file", XML_FILE_PARSE_ERROR));

             wsee.initCause(e);

             throw wsee;

         }

     }

     public Element export(ExportDataSet dataSet) {

         DocumentTypeXmlExporter exporter = new DocumentTypeXmlExporter();

         return exporter.export(dataSet);

     }

     @Override

         public boolean supportPrettyPrint() {

                 return true;

         }

     public List getChildDocumentTypes(String documentTypeId) {

             List childDocumentTypes = new ArrayList();

             List childIds = getDocumentTypeDAO().getChildDocumentTypeIds(documentTypeId);

             for (Iterator iter = childIds.iterator(); iter.hasNext();) {

                         String childDocumentTypeId = (String) iter.next();

                         childDocumentTypes.add(findById(childDocumentTypeId));

                 }

             return childDocumentTypes;

     }

 }