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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    * 
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.portals.bridges.struts.config;
18  
19  import org.apache.commons.digester.Digester;
20  import org.apache.commons.digester.Rule;
21  import org.xml.sax.Attributes;
22  
23  public abstract class AbstractConfigComponent
24  {
25      protected static class SetParentRule extends Rule
26      {
27          private Object parent;
28          
29          public SetParentRule(Object parent)
30          {
31              this.parent = parent;
32          }
33          
34          public void begin( String arg0, String arg1, Attributes arg2 ) throws Exception
35          {
36              digester.push(parent);
37          }        
38      }
39      
40      private boolean loaded = false;
41      
42      public AbstractConfigComponent()
43      {
44      }
45      
46      protected void checkLoaded()
47      {
48          if (loaded)
49              throw new IllegalStateException("Already loaded");
50      }
51      
52      public abstract void configure(Digester digester);
53      
54      public void afterLoad()
55      {
56          checkLoaded();
57          loaded = true;
58      }
59  }