01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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: */
18: package org.apache.lenya.cms.metadata;
19:
20: /**
21: * Meta data registry.
22: */
23: public interface MetaDataRegistry {
24:
25: /**
26: * The Avalon role.
27: */
28: String ROLE = MetaDataRegistry.class.getName();
29:
30: /**
31: * @param namespaceUri The namespace URI of the element set.
32: * @return the element set.
33: * @throws MetaDataException if an error occurs.
34: */
35: ElementSet getElementSet(String namespaceUri)
36: throws MetaDataException;
37:
38: /**
39: * Checks if an element set is registered.
40: * @param namespaceUri The namespace URI.
41: * @return A boolean value.
42: * @throws MetaDataException if an error occurs.
43: */
44: boolean isRegistered(String namespaceUri) throws MetaDataException;
45:
46: /**
47: * Register an element set.
48: * @param namespaceUri The namespace URI.
49: * @param elementSet The element set.
50: * @throws MetaDataException if a set is already registered for this name.
51: */
52: void register(String namespaceUri, ElementSet elementSet)
53: throws MetaDataException;
54:
55: /**
56: * @return The registered namespace URIs.
57: * @throws MetaDataException if an error occurs.
58: */
59: String[] getNamespaceUris() throws MetaDataException;
60:
61: }
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