/**
    * Copyright 2005-2013 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.lookupable;
  
  import javax.servlet.jsp.PageContext;
  
  import org.apache.commons.lang.StringUtils;
  import org.displaytag.decorator.DisplaytagColumnDecorator;
  import org.displaytag.exception.DecoratorException;
  import org.displaytag.properties.MediaTypeEnum;
  import org.kuali.rice.kew.api.KewApiConstants;
  
  
  /**
   * A ColumnDecorator for columns in a Lookup which adds an extra non-breaking space if the column
   * is an empty String.
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class LookupColumnDecorator implements DisplaytagColumnDecorator {
  
  	public Object decorate(Object columnValue, PageContext pageContext, MediaTypeEnum media) throws DecoratorException {
  		if (columnValue == null) {
  			return KewApiConstants.HTML_NON_BREAKING_SPACE;
  		}
  		if (columnValue instanceof String && StringUtils.isEmpty(((String)columnValue).trim())) {
  			return KewApiConstants.HTML_NON_BREAKING_SPACE;
  		}
  		return columnValue;
  	}
  
  }