/*
    * Copyright 2007-2009 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.rule.bo;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.kuali.rice.core.api.exception.RiceRuntimeException;
  import org.kuali.rice.core.util.ConcreteKeyValue;
  import org.kuali.rice.core.util.KeyValue;
  import org.kuali.rice.kew.rule.Role;
  import org.kuali.rice.kew.rule.RuleBaseValues;
  import org.kuali.rice.kew.rule.RuleDelegation;
  import org.kuali.rice.kns.util.KNSGlobalVariables;
  import org.kuali.rice.kns.web.struts.form.KualiMaintenanceForm;
  import org.kuali.rice.krad.bo.PersistableBusinessObject;
  import org.kuali.rice.kns.document.MaintenanceDocument;
  import org.kuali.rice.krad.keyvalues.KeyValuesBase;
  import org.kuali.rice.krad.util.GlobalVariables;
  
  /**
   * A values finder for generating a list of Role names that can be selected for a given RuleTemplate.
   * 
   * This is dependant on the template selected on the maintenance document so it needs to use
   * GlobalVariables to get a reference to the KualiForm so it can examine the business object
   * and extract the role names from the RuleTemplate.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class RoleNameValuesFinder extends KeyValuesBase {
  	
  	@Override
  	public List<KeyValue> getKeyValues() {
  		List<KeyValue> roleNames = new ArrayList<KeyValue>();
  		if (KNSGlobalVariables.getKualiForm() != null && KNSGlobalVariables.getKualiForm() instanceof KualiMaintenanceForm) {
  			KualiMaintenanceForm form = (KualiMaintenanceForm)KNSGlobalVariables.getKualiForm();
  			MaintenanceDocument document = (MaintenanceDocument)form.getDocument();
  			PersistableBusinessObject businessObject = document.getNewMaintainableObject().getBusinessObject();
  			RuleBaseValues rule = null;
  			if (businessObject instanceof RuleBaseValues) {
  				rule = (RuleBaseValues)businessObject;
  			} else if (businessObject instanceof RuleDelegation) {
  				rule = ((RuleDelegation)businessObject).getDelegationRuleBaseValues();
  			} else {
  				throw new RiceRuntimeException("Cannot locate RuleBaseValues business object on maintenance document.  Business Object was " + businessObject);
  			}
  			RuleTemplate ruleTemplate = rule.getRuleTemplate();
  			List<Role> roles = ruleTemplate.getRoles();
  			for (Role role : roles) {
  				roleNames.add(new ConcreteKeyValue(role.getName(), role.getLabel()));
  			}
  		}
  		return roleNames;
  	}
  
  }