/*

  * 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.kns.web.struts.action;

 import org.apache.commons.lang.StringUtils;

 import org.apache.struts.util.MessageResources;

 import org.apache.struts.util.PropertyMessageResourcesFactory;

 import org.kuali.rice.core.api.config.property.ConfigContext;

 import org.kuali.rice.krad.util.KRADConstants;

 /**

  * A custom MessageResourceFactory that delegates to the ConfigurationService's pre-loaded properties.

  * 

  * This factory can be used in struts-config.xml files by specifying a factory attribute in the <message-resources/> tag.  

  * Example: 

  *   <message-resources 

  *       factory="KualiPropertyMessageResourcesFactory"

  *       parameter="SampleApplicationResources" />

  */

 public class KualiPropertyMessageResourcesFactory extends PropertyMessageResourcesFactory {

     private static final long serialVersionUID = 9045578011738154255L;

     /**

      * Uses KualiPropertyMessageResources, which allows multiple property files to be loaded into the defalt message set.

      * 

      * @see org.apache.struts.util.MessageResourcesFactory#createResources(java.lang.String)

      */

     @Override

     public MessageResources createResources(String config) {

         if (StringUtils.isBlank(config)) {

             final String propertyConfig = (String) ConfigContext.getCurrentContextConfig().getProperties().get(

                     KRADConstants.MESSAGE_RESOURCES);

             config = removeSpacesAround(propertyConfig);

         }

         return new KualiPropertyMessageResources(this, config, this.returnNull);

     }

     /**

      * Removes the spaces around the elements on a csv list of elements.

      * <p>

      * A null input will return a null output.

      * </p>

      * 

      * @param csv a list of elements in csv format e.g. foo, bar, baz

      * @return a list of elements in csv format without spaces e.g. foo,bar,baz

      */

     private String removeSpacesAround(String csv) {

             if (csv == null) {

                     return null;

             }

             final StringBuilder result = new StringBuilder();

                 for (final String value : csv.split(",")) {

                         if (!"".equals(value.trim())) {

                                 result.append(value.trim());

                                 result.append(",");

                         }

                 }

                 //remove trailing comma

                 int i = result.lastIndexOf(",");

                 if (i != -1) {

                         result.deleteCharAt(i);

                 }

                 return result.toString();

     }

 }