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 javax.jdo.metadata;
18
19 /**
20 * This interface provides base level definitions for all metadata components.
21 *
22 * @version 3.0
23 */
24 public interface Metadata {
25 /**
26 * Add a vendor extension to this metadata component.
27 *
28 * @param vendor Identifier for the vendor
29 * @param key The extension key
30 * @param value Value for the extension
31 * @return The ExtensionMetadata
32 */
33 ExtensionMetadata newExtensionMetadata(String vendor, String key, String value);
34
35 /**
36 * Number of extensions on this component.
37 *
38 * @return Number of extensions
39 */
40 int getNumberOfExtensions();
41
42 /**
43 * Accessor for the defined extensions for this component
44 *
45 * @return The extensions
46 */
47 ExtensionMetadata[] getExtensions();
48
49 /**
50 * Accessor for the parent metadata component.
51 *
52 * @return The parent
53 */
54 Metadata getParent();
55 }