java/beans/PersistenceDelegate.java

100      * be mutated into an accurate copy of {@code oldInstance}.
106      * @param oldInstance The instance that will be created by this expression.
111     public void writeObject(Object oldInstance, Encoder out) {
112         Object newInstance = out.get(oldInstance);
113         if (!mutatesTo(oldInstance, newInstance)) {
114             out.remove(oldInstance);
115             out.writeExpression(instantiate(oldInstance, out));
118             initialize(oldInstance.getClass(), oldInstance, newInstance, out);
123      * Returns true if an <em>equivalent</em> copy of {@code oldInstance} may be
126      * is indistinguishable from {@code oldInstance} in the behavior
136      * @param oldInstance The instance to be copied.
139      *         created by applying a series of mutations to {@code oldInstance}.
141     protected boolean mutatesTo(Object oldInstance, Object newInstance) {
142         return (newInstance != null && oldInstance != null &&
143                 oldInstance.getClass() == newInstance.getClass());
147      * Returns an expression whose value is {@code oldInstance}.
153      * Field f = (Field)oldInstance;
158      * will be identical to {@code oldInstance}.
160      * @param oldInstance The instance that will be created by this expression.
162      * @return An expression whose value is {@code oldInstance}.
167     protected abstract Expression instantiate(Object oldInstance, Encoder out);
171      * so that the new instance becomes <em>equivalent</em> to {@code oldInstance}.
178      * "what happened" statements involving the {@code oldInstance}
186      * which start out as references to {@code oldInstance} are returned
202      * @param oldInstance The instance to be copied.
209                               Object oldInstance, Object newInstance,
214         info.initialize(superType, oldInstance, newInstance, out);