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 javax.swing.DefaultComboBoxModel;
21:
22: class SwingDefaultComboBoxModelPersistenceDelegate extends
23: DefaultPersistenceDelegate {
24: @Override
25: @SuppressWarnings({"nls","boxing"})
26: protected void initialize(Class<?> type, Object oldInstance,
27: Object newInstance, Encoder enc) {
28: super .initialize(type, oldInstance, newInstance, enc);
29:
30: DefaultComboBoxModel model = (DefaultComboBoxModel) oldInstance;
31:
32: int count = model.getSize();
33: Expression getterExp = null;
34: for (int i = 0; i < count; i++) {
35: getterExp = new Expression(model, "getElementAt",
36: new Object[] { i });
37: try {
38: // Calculate the old value of the property
39: Object oldVal = getterExp.getValue();
40: // Write the getter expression to the encoder
41: enc.writeExpression(getterExp);
42: // Get the target value that exists in the new environment
43: Object targetVal = enc.get(oldVal);
44: // Get the current property value in the new environment
45: Object newVal = null;
46: try {
47: newVal = new Expression(newInstance,
48: "getElementAt", new Object[] { i })
49: .getValue();
50: } catch (IndexOutOfBoundsException ex) {
51: // The newInstance has no elements, so current property
52: // value remains null
53: }
54: /*
55: * Make the target value and current property value equivalent
56: * in the new environment
57: */
58: Statement setterStm = null;
59: if (null == targetVal) {
60: if (null != newVal) {
61: // Set to null
62: setterStm = new Statement(oldInstance,
63: "addElement", new Object[] { null });
64: enc.writeStatement(setterStm);
65: }
66: } else {
67: PersistenceDelegate pd = enc
68: .getPersistenceDelegate(targetVal
69: .getClass());
70: if (!pd.mutatesTo(targetVal, newVal)) {
71: setterStm = new Statement(oldInstance,
72: "addElement", new Object[] { oldVal });
73: enc.writeStatement(setterStm);
74: }
75: }
76: } catch (Exception ex) {
77: enc.getExceptionListener().exceptionThrown(ex);
78: }
79: }
80: }
81: }
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