/** java.io.ObjectStreamClass#getFields() */
public void test_getFields() {
ObjectStreamClass osc = ObjectStreamClass.lookup(DummyClass.class);
ObjectStreamField[] osfArray = osc.getFields();
assertTrue(
"Array of fields should be of length 2 but is instead of length: " + osfArray.length,
osfArray.length == 2);
}
static void print(ObjectStreamClass desc) {
System.out.println("Class name : " + desc.getName());
System.out.println("SerialVersionUID: " + desc.getSerialVersionUID());
System.out.println("ObjectStreamFields");
ObjectStreamField[] fields = desc.getFields();
int numPrim = 0;
int numObj = 0;
for (int i = 0; i < fields.length; i++) {
ObjectStreamField f = fields[i];
String fieldName = "<fieldName unknown>";
try {
fieldName = f.getName();
} catch (NoSuchMethodError e) {
// ignore. ObjectStreamField.getName did not exist in JDK 1.1
}
if (f.isPrimitive()) {
numPrim++;
System.out.println("" + i + ". " + f.getType().getName() + " " + fieldName);
} else {
numObj++;
String ts = "<unknown>";
try {
ts = f.getTypeString();
} catch (NoSuchMethodError e) {
// ignore. ObjectStreamField.getTypeString did not exist in JDK 1.1
ts = "<field type unknown>";
}
System.out.println("" + i + ". " + ts + " " + fieldName);
}
}
System.out.println("# primitive fields:" + numPrim + " # object ref fields:" + numObj);
}
public void test_specialTypes() {
Class<?> proxyClass =
Proxy.getProxyClass(this.getClass().getClassLoader(), new Class[] {Runnable.class});
ObjectStreamClass proxyStreamClass = ObjectStreamClass.lookup(proxyClass);
assertEquals(
"Proxy classes should have zero serialVersionUID",
0,
proxyStreamClass.getSerialVersionUID());
ObjectStreamField[] proxyFields = proxyStreamClass.getFields();
assertEquals("Proxy classes should have no serialized fields", 0, proxyFields.length);
ObjectStreamClass enumStreamClass = ObjectStreamClass.lookup(Thread.State.class);
assertEquals(
"Enum classes should have zero serialVersionUID", 0, enumStreamClass.getSerialVersionUID());
ObjectStreamField[] enumFields = enumStreamClass.getFields();
assertEquals("Enum classes should have no serialized fields", 0, enumFields.length);
}
private void checkFields(Object obj, ObjectStreamClass desc) {
int numFields;
try {
numFields = (Integer) GET_NUM_OBJ_FIELDS_METHOD.invoke(desc, (Object[]) null);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
if (numFields > 0) {
int numPrimFields;
ObjectStreamField[] fields = desc.getFields();
Object[] objVals = new Object[numFields];
numPrimFields = fields.length - objVals.length;
try {
GET_OBJ_FIELD_VALUES_METHOD.invoke(desc, obj, objVals);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
for (int i = 0; i < objVals.length; i++) {
if (objVals[i] instanceof String
|| objVals[i] instanceof Number
|| objVals[i] instanceof Date
|| objVals[i] instanceof Boolean
|| objVals[i] instanceof Class) {
// filter out common cases
continue;
}
// Check for circular reference.
if (checked.containsKey(objVals[i])) {
continue;
}
ObjectStreamField fieldDesc = fields[numPrimFields + i];
Field field;
try {
field = (Field) GET_FIELD_METHOD.invoke(fieldDesc, (Object[]) null);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
field.getName();
simpleName = field.getName();
fieldDescription = field.toString();
check(objVals[i]);
}
}
}
/**
* Serializes the given class to the getCurrentDirectory() directory. The static
* serializedInstance() method of clazz will be called to get an examplar of clazz. This examplar
* will then be serialized out to a file stored in getCurrentDirectory().
*
* @param clazz the class to serialize.
* @throws RuntimeException if clazz cannot be serialized. This exception has an informative
* message and wraps the originally thrown exception as root cause.
* @see #getCurrentDirectory()
*/
private void serializeClass(Class clazz, Map<String, List<String>> classFields)
throws RuntimeException {
File current = new File(getCurrentDirectory());
if (!current.exists() || !current.isDirectory()) {
throw new IllegalStateException(
"There is no "
+ current.getAbsolutePath()
+ " directory. "
+ "\nThis is where the serialized classes should be. "
+ "Please run serializeCurrentDirectory() first.");
}
try {
Field field = clazz.getDeclaredField("serialVersionUID");
int modifiers = field.getModifiers();
boolean _static = Modifier.isStatic(modifiers);
boolean _final = Modifier.isFinal(modifiers);
field.setAccessible(true);
if (!_static || !_final || !(23L == field.getLong(null))) {
throw new RuntimeException(
"Class " + clazz + " does not define static final " + "long serialVersionUID = 23L");
}
int numFields = getNumNonSerialVersionUIDFields(clazz);
if (numFields > 0) {
Method method = clazz.getMethod("serializableInstance");
Object object = method.invoke(null);
File file = new File(current, clazz.getName() + ".ser");
boolean created = file.createNewFile();
FileOutputStream out = new FileOutputStream(file);
ObjectOutputStream objOut = new ObjectOutputStream(out);
objOut.writeObject(object);
out.close();
}
// Make entry in list of class fields.
ObjectStreamClass objectStreamClass = ObjectStreamClass.lookup(clazz);
String className = objectStreamClass.getName();
ObjectStreamField[] fields = objectStreamClass.getFields();
@SuppressWarnings("Convert2Diamond")
List<String> fieldList = new ArrayList<>();
for (ObjectStreamField objectStreamField : fields) {
String fieldName = objectStreamField.getName();
fieldList.add(fieldName);
}
classFields.put(className, fieldList);
} catch (NoSuchFieldException e) {
throw new RuntimeException(
("There is no static final long field "
+ "'serialVersionUID' in "
+ clazz
+ ". Please make one and set it "
+ "to 23L."));
} catch (NoSuchMethodException e) {
throw new RuntimeException(
"Class " + clazz + "does not " + "have a public static serializableInstance constructor.",
e);
} catch (IllegalAccessException e) {
throw new RuntimeException(
"The method serializableInstance() of " + "class " + clazz + " is not public.", e);
} catch (InvocationTargetException e) {
throw new RuntimeException(
"Unable to statically call the "
+ "serializableInstance() method of class "
+ clazz
+ ".",
e);
} catch (IOException e) {
throw new RuntimeException(
"Could not create a new, writeable file "
+ "in "
+ getCurrentDirectory()
+ " when trying to serialize "
+ clazz
+ ".",
e);
}
}
public void testSerialization() {
ObjectStreamClass osc = ObjectStreamClass.lookup(ObjectStreamClass.class);
assertEquals(0, osc.getFields().length);
}
