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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/beans/DefaultPersistenceDelegate.java
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+/* DefaultPersistenceDelegate.java
+ Copyright (C) 2005 Free Software Foundation, Inc.
+
+ This file is part of GNU Classpath.
+
+ GNU Classpath is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ GNU Classpath is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNU Classpath; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301 USA.
+
+ Linking this library statically or dynamically with other modules is
+ making a combined work based on this library. Thus, the terms and
+ conditions of the GNU General Public License cover the whole
+ combination.
+
+ As a special exception, the copyright holders of this library give you
+ permission to link this library with independent modules to produce an
+ executable, regardless of the license terms of these independent
+ modules, and to copy and distribute the resulting executable under
+ terms of your choice, provided that you also meet, for each linked
+ independent module, the terms and conditions of the license of that
+ module. An independent module is a module which is not derived from
+ or based on this library. If you modify this library, you may extend
+ this exception to your version of the library, but you are not
+ obligated to do so. If you do not wish to do so, delete this
+ exception statement from your version. */
+
+
+package java.beans;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+/** <p><code>DefaultPersistenceDelegate</code> is a {@link PersistenceDelegate}
+ * implementation that can be used to serialize objects which adhere to the
+ * Java Beans naming convention.</p>
+ *
+ * @author Robert Schuster (robertschuster@fsfe.org)
+ * @since 1.4
+ */
+public class DefaultPersistenceDelegate extends PersistenceDelegate
+{
+
+ private String[] constructorPropertyNames;
+
+ /** Using this constructor the object to be serialized will be instantiated
+ * with the default non-argument constructor.
+ */
+ public DefaultPersistenceDelegate()
+ {
+ }
+
+ /** This constructor allows to specify which Bean properties appear
+ * in the constructor.
+ *
+ * <p>The implementation reads the mentioned properties from the Bean
+ * instance and applies it in the given order to a corresponding
+ * constructor.</p>
+ *
+ * @param constructorPropertyNames The properties the Bean's constructor
+ * should be given to.
+ */
+ public DefaultPersistenceDelegate(String[] constructorPropertyNames)
+ {
+ this.constructorPropertyNames = constructorPropertyNames;
+ }
+
+ protected boolean mutatesTo(Object oldInstance, Object newInstance)
+ {
+ try
+ {
+
+ return (constructorPropertyNames != null
+ && constructorPropertyNames.length > 0
+ && oldInstance.getClass()
+ .getDeclaredMethod("equals",
+ new Class[] { Object.class }) != null)
+ ? oldInstance.equals(newInstance)
+ : super.mutatesTo(oldInstance, newInstance);
+ }
+ catch (NoSuchMethodException nsme)
+ {
+ return super.mutatesTo(oldInstance, newInstance);
+ }
+ }
+
+ protected Expression instantiate(Object oldInstance, Encoder out)
+ {
+ Object[] args = null;
+
+ try
+ {
+ // If there are property names in the array, then we create
+ // a corresponding argument array and store every
+ // argument in it. To retrieve an argument object we have
+ // dig up the right property in the bean class' BeanInfo
+ // object.
+ // This is so costly in terms of execution time I better
+ // not think twice about it ...
+ if (constructorPropertyNames != null)
+ {
+ args = new Object[constructorPropertyNames.length];
+
+ // Look up the properties of oldInstance's class to find matches for
+ // the
+ // names given in the constructor.
+ PropertyDescriptor[] propertyDescs = Introspector.getBeanInfo(
+ oldInstance.getClass()).getPropertyDescriptors();
+
+ for (int i = 0; i < constructorPropertyNames.length; i++)
+ {
+ // Scan the property descriptions for a matching name.
+ for (int j = 0; j < propertyDescs.length; j++)
+ {
+ if (propertyDescs[i].getName().equals(
+ constructorPropertyNames[i]))
+ {
+ Method readMethod = propertyDescs[i].getReadMethod();
+
+ args[i] = readMethod.invoke(oldInstance);
+ }
+ }
+ }
+ }
+
+ }
+ catch (IllegalAccessException iae)
+ {
+ out.getExceptionListener().exceptionThrown(iae);
+ }
+ catch (IllegalArgumentException iarge)
+ {
+ out.getExceptionListener().exceptionThrown(iarge);
+ }
+ catch (InvocationTargetException ite)
+ {
+ out.getExceptionListener().exceptionThrown(ite);
+ }
+ catch (IntrospectionException ie)
+ {
+ out.getExceptionListener().exceptionThrown(ie);
+ }
+
+ return new Expression(oldInstance, oldInstance.getClass(), "new", args);
+ }
+
+ protected void initialize(Class<?> type, Object oldInstance,
+ Object newInstance, Encoder out)
+ {
+ // Calling the supertype's implementation of initialize makes it
+ // possible that descendants of classes like AbstractHashMap
+ // or Hashtable are serialized correctly. This mechanism grounds on
+ // two other facts:
+ // * Each class which has not registered a special purpose
+ // PersistenceDelegate is handled by a DefaultPersistenceDelegate
+ // instance.
+ // * PersistenceDelegate.initialize() is implemented in a way that it
+ // calls the initialize method of the superclass' persistence delegate.
+ super.initialize(type, oldInstance, newInstance, out);
+
+ // Suppresses the writing of property setting statements when this delegate
+ // is not used for the exact instance type. By doing so the following code
+ // is called only once per object.
+ if (type != oldInstance.getClass())
+ return;
+
+ try
+ {
+ PropertyDescriptor[] propertyDescs = Introspector.getBeanInfo(
+ oldInstance.getClass()).getPropertyDescriptors();
+
+ for (int i = 0; i < propertyDescs.length; i++)
+ {
+ Method readMethod = propertyDescs[i].getReadMethod();
+ Method writeMethod = propertyDescs[i].getWriteMethod();
+
+ if (readMethod != null && writeMethod != null)
+ {
+ Object oldValue = readMethod.invoke(oldInstance);
+
+ if (oldValue != null)
+ out.writeStatement(new Statement(oldInstance,
+ writeMethod.getName(),
+ new Object[] { oldValue }));
+ }
+ }
+ }
+ catch (IntrospectionException ie)
+ {
+ out.getExceptionListener().exceptionThrown(ie);
+ }
+ catch (IllegalAccessException iae)
+ {
+ out.getExceptionListener().exceptionThrown(iae);
+ }
+ catch (InvocationTargetException ite)
+ {
+ out.getExceptionListener().exceptionThrown(ite);
+ }
+ }
+}