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 java.beans;
19:
20: import java.lang.reflect.Field;
21:
22: /**
23: * This is a persistence delegate for the {@link java.lang.reflect.Field} class.
24: */
25: class FieldPersistenceDelegate extends PersistenceDelegate {
26: @Override
27: protected Expression instantiate(Object oldInstance, Encoder out) {
28: // should not be null or have a type other than Field
29: assert oldInstance instanceof Field : oldInstance;
30: Field oldField = (Field) oldInstance;
31: Class<?> declClass = oldField.getDeclaringClass();
32: return new Expression(oldField, declClass, "getField", //$NON-NLS-1$
33: new Object[] { oldField.getName() });
34: }
35:
36: @Override
37: protected void initialize(Class<?> type, Object oldInstance,
38: Object newInstance, Encoder out) {
39: // check for consistency
40: assert oldInstance instanceof Field : oldInstance;
41: assert newInstance instanceof Field : newInstance;
42: assert newInstance.equals(oldInstance);
43: }
44:
45: @Override
46: protected boolean mutatesTo(Object oldInstance, Object newInstance) {
47: assert oldInstance instanceof Field : oldInstance;
48: if (!(newInstance instanceof Field)) {
49: // if null or not a Field
50: return false;
51: }
52: return oldInstance.equals(newInstance);
53: }
54: }
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