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 }