/**

  * Copyright 2010 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.osedu.org/licenses/ECL-2.0

  *

  * 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.student.common.ui.server.gwt;

 import java.util.List;

 import java.util.Map;

 import org.apache.log4j.Logger;

 import org.kuali.student.common.assembly.data.Data;

 import org.kuali.student.common.assembly.data.Metadata;

 import org.kuali.student.common.exceptions.DataValidationErrorException;

 import org.kuali.student.common.exceptions.VersionMismatchException;

 import org.kuali.student.common.rice.authorization.PermissionType;

 import org.kuali.student.common.ui.client.service.BaseDataOrchestrationRpcService;

 import org.kuali.student.common.ui.client.service.DataSaveResult;

 import org.kuali.student.common.ui.client.service.exceptions.OperationFailedException;

 import org.kuali.student.common.ui.client.service.exceptions.VersionMismatchClientException;

 import org.kuali.student.common.validation.dto.ValidationResultInfo;

 import com.google.gwt.user.server.rpc.RemoteServiceServlet;

 /**

  * Generic implementation of data gwt data operations calls.

  *

  */

 public class DataGwtServlet extends RemoteServiceServlet implements BaseDataOrchestrationRpcService {

         private static final long serialVersionUID = 1L;

         final Logger LOG = Logger.getLogger(DataGwtServlet.class);

         private DataService dataService;

         @Override

         public Data getData(String id) throws OperationFailedException {

                 try{

                         return dataService.getData(id);

                 } catch (Exception e) {

                         LOG.error("Could not get Data ", e);

                         throw new OperationFailedException("Failed to get data");

                 }

         }

         @Override

         public Metadata getMetadata(String id, Map<String, String> idAttributes) throws OperationFailedException {

                 try{

                         return dataService.getMetadata(id, idAttributes);

                 } catch (Exception e) {

                         LOG.error("Could not get metadata ", e);

                         throw new OperationFailedException("Failed to get metadata");

                 }

         }

         @Override

         public DataSaveResult saveData(Data data) throws OperationFailedException, VersionMismatchClientException {

                 try{

                         return dataService.saveData(data);

                 } catch (DataValidationErrorException dvee){

                         //This should only get thrown if service save call resulted in validation errors. These errors

                         //should be sent to the UI using DataSaveResult instead of throwing an exception.

                         //Sending null for data value, since UI should already have it and nothing changed.

                         DataSaveResult saveResult = new DataSaveResult();

                         saveResult.setValidationResults(dvee.getValidationResults());

                         return saveResult;

                 } catch (VersionMismatchException vme){

                     throw new VersionMismatchClientException(vme.getMessage());

                 } catch (Exception e) {

                         LOG.error("Could not save data ", e);

                         throw new OperationFailedException(e.getMessage());

                 } 

         }

         @Override

         public List<ValidationResultInfo> validate(Data data)

                         throws OperationFailedException {

                 try{

                         return dataService.validateData(data);

                 } catch (Exception e) {

                         LOG.error("Could not validate data ", e);

                         throw new OperationFailedException("Failed to  data");

                 } 

         }

         @Override

         public Boolean isAuthorized(PermissionType type, Map<String,String> attributes) {

                 return dataService.isAuthorized(type, attributes);

         }

         public DataService getDataService() {

                 return dataService;

         }

         public void setDataService(DataService dataService) {

                 this.dataService = dataService;

         }

 }