/*
    * Copyright 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.ole.sys.document.service.impl;
  
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import org.kuali.ole.sys.businessobject.AccountingLine;
  import org.kuali.ole.sys.document.AccountingDocument;
  import org.kuali.ole.sys.document.authorization.AccountingLineAuthorizer;
  import org.kuali.ole.sys.document.service.AccountingLineAuthorizationTransformer;
  import org.kuali.ole.sys.document.web.TableJoining;
  import org.kuali.rice.kim.api.identity.Person;
  import org.kuali.rice.krad.util.GlobalVariables;
  
  /**
   * Like a regular accounting line rendering transformer, though this  
   */
  public class AccountingLineAuthorizationTransformerImpl implements AccountingLineAuthorizationTransformer {
  
      /**
       * Performs transformations to the element rendering tree based on the authorization's reactions to the accounting line
       * @param elements the element rendering tree
       * @param accountingLine the accounting line to be rendered
       * @param document the document that accounting line lives on
       * @param lineAuthorizer the authorizer for the accounting line
       * @param newLine is this line a new line or a line already on a document?
       * 
       */
      public void transformElements(List<TableJoining> elements, AccountingLine accountingLine, AccountingDocument document, AccountingLineAuthorizer lineAuthorizer, boolean newLine, String accountingLinePropertyName) {
          final Person currentUser = GlobalVariables.getUserSession().getPerson();
          removeUnviewableBlocks(elements, lineAuthorizer.getUnviewableBlocks(document, accountingLine, newLine, currentUser));
      }
      
      /**
       * 
       * @param elements the elements of the rendering tree
       * @param unviewableBlocks a Set of the names of blocks that are not viewable
       */
      protected void removeUnviewableBlocks(List<TableJoining> elements, Set<String> unviewableBlocks) {
          if (unviewableBlocks.size() > 0) {
              Set<TableJoining> elementsToRemove = new HashSet<TableJoining>();
              for (TableJoining element : elements) {
                  if (unviewableBlocks.contains(element.getName())) {
                      elementsToRemove.add(element);
                  } else {
                      element.removeUnviewableBlocks(unviewableBlocks);
                  }
              }
              elements.removeAll(elementsToRemove);
          }
      }
  }