/**
    * Copyright 2005-2014 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.util;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.config.property.ConfigStrLookup;
  import org.kuali.rice.coreservice.api.CoreServiceApiServiceLocator;
  import org.kuali.rice.coreservice.api.parameter.ParameterKey;
  import org.kuali.rice.coreservice.framework.CoreFrameworkServiceLocator;
  import org.kuali.rice.kew.api.KewApiConstants;
  import org.kuali.rice.krad.util.KRADConstants;
  
  /**
   * Uses the KEW runtime parameters to locate a string for replacement, falling back to the deploy time configuration
   * variables if necessary.
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class ParameterStrLookup extends ConfigStrLookup {
  	
  	private final String applicationId;
  
      /**
       * Creates a string locator to search for KEW runtime parameters for any {@code applicationId}.
       */
  	public ParameterStrLookup() {
          this(null);
  	}
  
      /**
       * Creates a string locator to search for KEW runtime parameters for a specific {@code applicationId}.
       *
       * @param applicationId the application to search for the KEW runtime parameter in.
       */
  	public ParameterStrLookup(String applicationId) {
  		this.applicationId = applicationId;
  	}
  
      /**
       * {@inheritDoc}
       */
      @Override
      public String lookup(String propertyName) {
          if (StringUtils.isBlank(propertyName)) {
              return null;
          }
  
          String paramValue;
  
          // check runtime parameters first
          if (StringUtils.isBlank(applicationId)) {
              paramValue = CoreFrameworkServiceLocator.getParameterService().getParameterValueAsString(
                      KewApiConstants.KEW_NAMESPACE, KRADConstants.DetailTypes.ALL_DETAIL_TYPE, propertyName);
          } else {
              ParameterKey parameterKey = ParameterKey.create(applicationId, KewApiConstants.KEW_NAMESPACE,
                      KRADConstants.DetailTypes.ALL_DETAIL_TYPE, propertyName);
              paramValue = CoreServiceApiServiceLocator.getParameterRepositoryService().getParameterValueAsString(parameterKey);
          }
  
          // fall back to deploy time configurations if empty
          if (paramValue == null) {
              paramValue = super.lookup(propertyName);
          }
  
          return paramValue;
      }
  
  }