/*
    * Copyright 2005-2008 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.rice.kew.util;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.commons.lang.text.StrLookup;
  import org.kuali.rice.core.config.ConfigContext;
  import org.kuali.rice.kns.service.KNSServiceLocator;
  import org.kuali.rice.kns.util.KNSConstants;
  
  /**
   * Looks up Strings from the Config and System Parameters.
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class ConfigStringLookup extends StrLookup {
  	private String namespace;
  	
  	public ConfigStringLookup() {
  		
  	}
  	
  	public ConfigStringLookup(String namespace) {
  		this.namespace = namespace;
  	}
  	
  	@Override
  	public String lookup(String propertyName) {
  		if (StringUtils.isBlank(propertyName)) {
  			return null;
  		}
  		
  		String paramValue = null;
  		
  		// TODO temporarily disabling configuration parameter resolution against the racms because it's been causing some issues
  		if ( namespace != null ) {
  			paramValue = KNSServiceLocator.getRiceApplicationConfigurationMediationService().getConfigurationParameter(namespace, propertyName);
  		}
  		
  		// check system parameters first
  		if ( paramValue == null ) {
  			paramValue = Utilities.getKNSParameterValue(KEWConstants.KEW_NAMESPACE, KNSConstants.DetailTypes.ALL_DETAIL_TYPE, propertyName);
  		}
  		if (paramValue == null) {
  			paramValue = ConfigContext.getCurrentContextConfig().getProperty(propertyName);
  		}
  		return paramValue;
  	}
  
  }