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.commons.modeler.modules;
18
19 import java.io.File;
20 import java.io.FileInputStream;
21 import java.io.IOException;
22 import java.io.InputStream;
23 import java.net.URL;
24 import java.util.List;
25
26 import javax.management.ObjectName;
27
28 import org.apache.commons.modeler.Registry;
29
30 /** Source for descriptor data. More sources can be added.
31 *
32 */
33 public class ModelerSource {
34 protected Object source;
35 protected String location;
36
37 /** Load data, returns a list of items.
38 *
39 * @param registry
40 * @param location
41 * @param type
42 * @param source Introspected object or some other source
43 * @throws Exception
44 */
45 public List loadDescriptors( Registry registry, String location,
46 String type, Object source)
47 throws Exception
48 {
49 // TODO
50 return null;
51 }
52
53 /** Callback from the BaseMBean to notify that an attribute has changed.
54 * Can be used to implement persistence.
55 *
56 * @param oname
57 * @param name
58 * @param value
59 */
60 public void updateField( ObjectName oname, String name,
61 Object value ) {
62 // nothing by default
63 }
64
65 public void store() {
66 // nothing
67 }
68
69 protected InputStream getInputStream() throws IOException {
70 if( source instanceof URL ) {
71 URL url=(URL)source;
72 location=url.toString();
73 return url.openStream();
74 } else if( source instanceof File ) {
75 location=((File)source).getAbsolutePath();
76 return new FileInputStream((File)source);
77 } else if( source instanceof String) {
78 location=(String)source;
79 return new FileInputStream((String)source);
80 } else if( source instanceof InputStream ) {
81 return (InputStream)source;
82 }
83 return null;
84 }
85
86 }