/*

  * Copyright 2007-2008 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.lookup;

 import java.io.Serializable;

 import java.sql.Timestamp;

 import java.util.Collection;

 import java.util.List;

 import java.util.Set;

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

 import org.kuali.rice.krad.web.ui.ResultRow;

 public interface LookupResultsService extends Serializable {

     /**

      * Persists a list of result row objects into a database.  The lookup results sequence number acts like a key identifying the lookup

      * results set.  If results are persisted under the same sequence number, then the previously persisted list will be overwritten. 

      * 

      * @param lookupResultsSequenceNumber the lookup sequence number.  Every time a user clicks "search", a new sequence number should be generated

      * @param resultTable A list of result rows.  Note that this list does not contain BOs, but the data necessary to render a lookup results screen

      * @param personId the user that is performing the search.  This prevents a malicious user from passing someone else's sequence number 

      * (which he can guess) and eventually retrieving it, possibly exposing sensitive data

      * @throws Exception

      */

     public void persistResultsTable(String lookupResultsSequenceNumber, List<ResultRow> resultTable, String personId) throws Exception;

     /**

      * Persists a list of BO object IDs that have been selected for return to the calling document (the back location in lookup terminology).

      * The lookup results sequence number acts like a key identifying the selected object IDs.  If results are persisted under the same 

      * sequence number, then the previously persisted list will be overwritten. 

      * 

      * @param lookupResultsSequenceNumber the lookup sequence number.  Every time a user clicks "search", a new sequence number should be generated

      * @param selectedObjectIds A set of the object IDs of the selected rows.

      * @param personId the user that is performing the search.  This prevents a malicious user from passing someone else's sequence number 

      * (which he can guess) and eventually retrieving it, possibly exposing sensitive data

      * @throws Exception

      */

     public void persistSelectedObjectIds(String lookupResultsSequenceNumber, Set<String> selectedObjectIds, String personId) throws Exception;

     /**

      * Returns the list of result rows that was persisted under the passed in sequence number

      * 

      * @param lookupResultsSequenceNumber the lookup sequence number that was used to persist

      * @param personId the user id that was used to persist the results table.  This prevents a malicious user from passing someone else's sequence number 

      * (which he can guess) and eventually retrieving it, possibly exposing sensitive data

      * @return 

      * @throws Exception many reasons, including if the user id parameter does not match the user used to persist the results

      */

     public List<ResultRow> retrieveResultsTable(String lookupResultsSequenceNumber, String personId) throws Exception;

     /**

      * Returns the BOs that correspond to the selected objected IDs that were persisted under the given lookup results number

      * 

      * DB data may have changed since the time the user clicked the "search" button (e.g. someone may have changed a value that was

      * used as a query criterion).  If so, implementations may or may not choose to handle this situation.

      *

      * @param lookupResultsSequenceNumber the lookup sequence number that was used to persist

      * @param boClass The class of BO being retrieved from the lookup

      * @param personId the user id that was used to persist the results table.  This prevents a malicious user from passing someone else's sequence number 

      * (which he can guess) and eventually retrieving it, possibly exposing sensitive data

      * @return A list of BOs corresponding to the 

      * @throws Exception many reasons, including if the user id parameter does not match the user used to persist the results

      */

     public <T extends BusinessObject> Collection<T> retrieveSelectedResultBOs(String lookupResultsSequenceNumber, Class<T> boClass, String personId) throws Exception;

     /**

      * Returns whether a user is allowed to view the lookup results of the given sequence number

      * 

      * @param lookupResultsSequenceNumber the lookup sequence number that was used to persist the results table

      * @param personId the user id that was used to persist the results table.

      * @return if the user ID used to persist the lookup results is the same user ID as the parameter

      */

     public boolean isAuthorizedToAccessLookupResults(String lookupResultsSequenceNumber, String personId);

     /**

      * Returns whether a user is allowed to view the selected object IDs of the given sequence number

      * 

      * @param lookupResultsSequenceNumber the lookup sequence number that was used to persist the selected object IDs

      * @param personId the user id that was used to persist the selected object IDs

      * @return if the user ID used to persist the selected object IDs is the same user ID as the parameter

      */

     public boolean isAuthorizedToAccessSelectedObjectIds(String lookupResultsSequenceNumber, String personId);

     /**

      * Removes the lookup results that were persisted under this lookup results sequence number

      * 

      * @param lookupResultsSequenceNumber

      * @throws Exception

      */

     public void clearPersistedLookupResults(String lookupResultsSequenceNumber) throws Exception;

     /**

      * Removes the lookup results that were persisted under this selected object IDs

      * 

      * @param lookupResultsSequenceNumber

      * @throws Exception

      */

     public void clearPersistedSelectedObjectIds(String lookupResultsSequenceNumber) throws Exception;

     /**

      * removes all LookupResults BO where the lookup date attribute is older than

      * the parameter

      * 

      * @param expirationDate all LookupResults having a lookup date before this date 

      * will be removed

      */

     public void deleteOldLookupResults(Timestamp expirationDate);

     /**

      * removes all LookupResults BO where the lookup date attribute is older than

      * the parameter

      * 

      * @param expirationDate all LookupResults having a lookup date before this date 

      * will be removed

      */

     public void deleteOldSelectedObjectIds(Timestamp expirationDate);

     /**

      * Determines the lookup id for a given business object

      * 

      * @param businessObject the business object to get a lookup id for

      * @return the lookup id

      */

     public abstract String getLookupId(BusinessObject businessObject);

 }