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: class StringPersistenceDelegate extends PersistenceDelegate {
21: @Override
22: protected Expression instantiate(Object oldInstance, Encoder out) {
23: String value = (String) oldInstance;
24: return new Expression(oldInstance, String.class,
25: "new", new Object[] { value }); //$NON-NLS-1$
26: }
27:
28: @Override
29: /*
30: * It's unnecessary to do anything for initialization, because two mutatable
31: * strings are actually equivalent already.
32: */
33: protected void initialize(Class<?> type, Object oldInstance,
34: Object newInstance, Encoder out) {
35: // do nothing
36: }
37:
38: @Override
39: protected boolean mutatesTo(Object oldInstance, Object newInstance) {
40: if (oldInstance instanceof String
41: && newInstance instanceof String) {
42: return newInstance.equals(oldInstance);
43: }
44: return super.mutatesTo(oldInstance, newInstance);
45: }
46: }
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