/*
    * Copyright 2006-2011 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.service.impl;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.config.property.ConfigurationService;
  import org.kuali.rice.core.api.search.SearchOperator;
  import org.kuali.rice.kns.service.KNSServiceLocator;
  import org.kuali.rice.krad.dao.LookupDao;
  import org.kuali.rice.krad.service.LookupService;
  
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Service implementation for the Lookup structure. It Provides a generic search
   * mechanism against Business Objects. This is the default implementation, that
   * is delivered with Kuali.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class LookupServiceImpl implements LookupService {
      private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(LookupServiceImpl.class);
  
      private LookupDao lookupDao;
      private ConfigurationService kualiConfigurationService;
  
      public <T extends Object> Collection<T> findCollectionBySearchUnbounded(Class<T> example,
              Map<String, String> formProps) {
          return findCollectionBySearchHelper(example, formProps, true);
      }
  
      /**
       * Returns a collection of objects based on the given search parameters.
       * 
       * @return Collection returned from the search
       */
      public <T extends Object> Collection<T> findCollectionBySearch(Class<T> example, Map<String, String> formProps) {
          return findCollectionBySearchHelper(example, formProps, false);
      }
  
      public <T extends Object> Collection<T> findCollectionBySearchHelper(Class<T> example,
              Map<String, String> formProps, boolean unbounded) {
          return lookupDao.findCollectionBySearchHelper(example, formProps, unbounded,
                  allPrimaryKeyValuesPresentAndNotWildcard(example, formProps));
      }
  
      /**
       * Retrieves a Object based on the search criteria, which should uniquely
       * identify a record.
       * 
       * @return Object returned from the search
       */
      public <T extends Object> T findObjectBySearch(Class<T> example, Map<String, String> formProps) {
          if (example == null || formProps == null) {
              throw new IllegalArgumentException("Object and Map must not be null");
          }
  
          T obj = null;
          try {
              obj = example.newInstance();
          } catch (IllegalAccessException e) {
              throw new RuntimeException("Cannot get new instance of " + example.getName(), e);
          } catch (InstantiationException e) {
              throw new RuntimeException("Cannot instantiate " + example.getName(), e);
          }
  
          return lookupDao.findObjectByMap(obj, formProps);
      }
  
      public boolean allPrimaryKeyValuesPresentAndNotWildcard(Class<?> boClass, Map<String, String> formProps) {
          List<String> pkFields = KNSServiceLocator.getBusinessObjectMetaDataService().listPrimaryKeyFieldNames(
                  boClass);
          Iterator<String> pkIter = pkFields.iterator();
          boolean returnVal = true;
          while (returnVal && pkIter.hasNext()) {
              String pkName = pkIter.next();
              String pkValue = formProps.get(pkName);
  
              if (StringUtils.isBlank(pkValue)) {
                  returnVal = false;
              } else {
                  for (SearchOperator op : SearchOperator.QUERY_CHARACTERS) {
                      if (pkValue.contains(op.op())) {
                          returnVal = false;
                          break;
                      }
                  }
             }
         }
         return returnVal;
     }
 
     /**
      * @return Returns the lookupDao.
      */
     public LookupDao getLookupDao() {
         return lookupDao;
     }
 
     /**
      * @param lookupDao The lookupDao to set.
      */
     public void setLookupDao(LookupDao lookupDao) {
         this.lookupDao = lookupDao;
     }
 
     public ConfigurationService getKualiConfigurationService() {
         return kualiConfigurationService;
     }
 
     public void setKualiConfigurationService(ConfigurationService kualiConfigurationService) {
         this.kualiConfigurationService = kualiConfigurationService;
     }
 }