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: package org.apache.commons.betwixt.registry;
18:
19: import org.apache.commons.betwixt.io.read.ElementMapping;
20: import org.apache.commons.betwixt.io.read.ReadContext;
21:
22: /**
23: * <p>Resolves polymorphic references.
24: * </p><p>
25: * A polymorphic reference is an element whose name and type
26: * resolution are postponed till bind-time.
27: * When the xml is read, the type can then resolved from
28: * by calling {@link #resolveType}.
29: * </p>
30: * @since 0.7
31: * @author <a href='http://jakarta.apache.org/'>Jakarta Commons Team</a>
32: */
33: public interface PolymorphicReferenceResolver {
34:
35: /**
36: * Resolves the bind-time type of a polymorphic element.
37: * @param mapping <code>ElementMapping</code> describing the (polymorphic) element being mapped,
38: * not null
39: * @param context <code>ReadContext</code>, not null
40: * @return the <code>Class</code> describing the type to which this element should be bound,
41: * or null if the reference cannot be resolved
42: */
43: public Class resolveType(ElementMapping mapping, ReadContext context);
44: }
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