public boolean execute() {
boolean executed = actions.executeAll();
if (executed) {
setStatus("executed");
} else {
actions.undoAll();
}
return executed;
}
public boolean undo() {
if (!isExecuted()) {
String error = "A transaction must be executed first.";
throw new RuntimeException(error);
}
boolean undone = actions.undoAll();
if (undone) {
setStatus("undone");
} else {
actions.executeAll();
}
return undone;
}
/**
* Copies the properties from the original entity to the historyEntity
*
* @param original
* @param historyEntity
* @throws DataAccessException
*/
public static void createHistoryEntity(IEntity original, IHistory historyEntity)
throws DataAccessException {
// copy all
try {
BeanInfo info = Introspector.getBeanInfo(original.getClass());
Class<? extends IHistory> targetClass = historyEntity.getClass();
Object[] noArgs = new Object[0];
PropertyDescriptor[] descs = info.getPropertyDescriptors();
// loop through all properties
for (int i = 0; i < descs.length; i++) {
if (!descs[i].getName().equals("id")
&& !descs[i].getName().equals("version")
&& !descs[i].getName().equals("callbacks")) {
Method mRead = descs[i].getReadMethod();
// this is the proper way to check if a method is PUBLIC
// because a method can also be final (the proxy entities used by Hibernate change the
// public into public final)
if (mRead != null && (mRead.getModifiers() & Modifier.PUBLIC) > 0) {
// Method mWrite = descs[i].getWriteMethod();
// create writer from 'target'
Method mWrite = null;
try {
PropertyDescriptor descr = new PropertyDescriptor(descs[i].getName(), targetClass);
mWrite = descr.getWriteMethod();
} catch (Throwable t) {
}
// has a writer method?
if (mWrite != null) {
// get the value from the source
Object value = mRead.invoke(original, noArgs);
// copy map
if (value instanceof Map) {
Map<Object, Object> newMap = new HashMap<Object, Object>();
newMap.putAll((Map<?, ?>) value);
value = newMap;
// copy collection
} else if (value instanceof Collection) {
Collection<Object> newSet;
if (value instanceof List) {
newSet = new ArrayList<Object>();
} else {
newSet = new HashSet<Object>(); // (Collection)value.getClass().newInstance();
}
newSet.addAll((Collection<?>) value);
value = newSet;
}
mWrite.invoke(historyEntity, new Object[] {value});
} else {
if (!mRead.getName().equals("getClass")) {
System.out.println("WARNING: No setter method for property " + descs[i].getName());
}
}
}
}
}
} catch (Exception e) {
throw new DataAccessException("Cant create History object: " + e, e);
}
}
public void add(IAction action) {
actions.add(action);
}