/*
    * 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.engine.node.var.schemes;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.URL;
  
  import org.apache.log4j.Logger;
  import org.kuali.rice.kew.engine.RouteContext;
  import org.kuali.rice.kew.engine.node.PropertiesUtil;
  import org.kuali.rice.kew.engine.node.var.Property;
  import org.kuali.rice.kew.engine.node.var.PropertyScheme;
  
  
  /**
   * A property scheme that interprets the locator as a URL.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class URLScheme implements PropertyScheme {
      private static final Logger LOG = Logger.getLogger(URLScheme.class);
  
      public String getName() {
          return "url";
      }
      public String getShortName() {
          return "url";
      }
  
      public Object load(Property property, RouteContext context) {
          LOG.info("Reading url '" + property.locator + "'...");
          InputStream is;
          try {
              is = new URL(property.locator).openStream();
              if (is == null) {
                  throw new RuntimeException("Unable to access URL: " + property.locator);
              }
              return PropertiesUtil.readResource(is);
          } catch (IOException ioe) {
              throw new RuntimeException("Error loading resource: " + property.locator, ioe);
          }
      }
  
      public String toString() {
          return "[URLScheme]";
      }
  }