ObjectStreamClass.java [plain text]
package java.io;
import gnu.java.io.NullOutputStream;
import gnu.java.lang.reflect.TypeSignature;
import gnu.java.security.action.SetAccessibleAction;
import gnu.java.security.provider.Gnu;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Proxy;
import java.security.AccessController;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PrivilegedAction;
import java.security.Security;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Hashtable;
import java.util.Vector;
public class ObjectStreamClass implements Serializable
{
public static ObjectStreamClass lookup(Class cl)
{
if (cl == null)
return null;
if (! (Serializable.class).isAssignableFrom(cl))
return null;
return lookupForClassObject(cl);
}
static ObjectStreamClass lookupForClassObject(Class cl)
{
if (cl == null)
return null;
ObjectStreamClass osc = (ObjectStreamClass) classLookupTable.get(cl);
if (osc != null)
return osc;
else
{
osc = new ObjectStreamClass(cl);
classLookupTable.put(cl, osc);
return osc;
}
}
public String getName()
{
return name;
}
public Class forClass()
{
return clazz;
}
public long getSerialVersionUID()
{
return uid;
}
public ObjectStreamField[] getFields()
{
ObjectStreamField[] copy = new ObjectStreamField[ fields.length ];
System.arraycopy(fields, 0, copy, 0, fields.length);
return copy;
}
public ObjectStreamField getField (String name)
{
for (int i = 0; i < fields.length; i++)
if (fields[i].getName().equals(name))
return fields[i];
return null;
}
public String toString()
{
return "java.io.ObjectStreamClass< " + name + ", " + uid + " >";
}
boolean hasWriteMethod()
{
return (flags & ObjectStreamConstants.SC_WRITE_METHOD) != 0;
}
boolean isSerializable()
{
return (flags & ObjectStreamConstants.SC_SERIALIZABLE) != 0;
}
boolean isExternalizable()
{
return (flags & ObjectStreamConstants.SC_EXTERNALIZABLE) != 0;
}
ObjectStreamClass getSuper()
{
return superClass;
}
static ObjectStreamClass[] getObjectStreamClasses(Class clazz)
{
ObjectStreamClass osc = ObjectStreamClass.lookup(clazz);
if (osc == null)
return new ObjectStreamClass[0];
else
{
Vector oscs = new Vector();
while (osc != null)
{
oscs.addElement (osc);
osc = osc.getSuper();
}
int count = oscs.size();
ObjectStreamClass[] sorted_oscs = new ObjectStreamClass[ count ];
for (int i = count - 1; i >= 0; i--)
sorted_oscs[ count - i - 1 ] = (ObjectStreamClass) oscs.elementAt(i);
return sorted_oscs;
}
}
int getFlags()
{
return flags;
}
ObjectStreamClass(String name, long uid, byte flags,
ObjectStreamField[] fields)
{
this.name = name;
this.uid = uid;
this.flags = flags;
this.fields = fields;
}
void setClass(Class cl, ObjectStreamClass superClass) throws InvalidClassException
{
this.clazz = cl;
cacheMethods();
long class_uid = getClassUID(cl);
if (uid == 0)
uid = class_uid;
else
{
if (uid != class_uid)
{
String msg = cl +
": Local class not compatible: stream serialVersionUID="
+ uid + ", local serialVersionUID=" + class_uid;
throw new InvalidClassException (msg);
}
}
isProxyClass = clazz != null && Proxy.isProxyClass(clazz);
this.superClass = superClass;
calculateOffsets();
try
{
ObjectStreamField[] exportedFields = getSerialPersistentFields (clazz);
if (exportedFields == null)
return;
ObjectStreamField[] newFieldList = new ObjectStreamField[exportedFields.length + fields.length];
int i, j, k;
Arrays.sort(exportedFields);
i = 0; j = 0; k = 0;
while (i < fields.length && j < exportedFields.length)
{
int comp = fields[i].compareTo(exportedFields[j]);
if (comp < 0)
{
newFieldList[k] = fields[i];
fields[i].setPersistent(false);
fields[i].setToSet(false);
i++;
}
else if (comp > 0)
{
newFieldList[k] = exportedFields[j];
newFieldList[k].setPersistent(true);
newFieldList[k].setToSet(false);
try
{
newFieldList[k].lookupField(clazz);
newFieldList[k].checkFieldType();
}
catch (NoSuchFieldException _)
{
}
j++;
}
else
{
try
{
exportedFields[j].lookupField(clazz);
exportedFields[j].checkFieldType();
}
catch (NoSuchFieldException _)
{
}
if (!fields[i].getType().equals(exportedFields[j].getType()))
throw new InvalidClassException
("serialPersistentFields must be compatible with" +
" imported fields (about " + fields[i].getName() + ")");
newFieldList[k] = fields[i];
fields[i].setPersistent(true);
i++;
j++;
}
k++;
}
if (i < fields.length)
for (;i<fields.length;i++,k++)
{
fields[i].setPersistent(false);
fields[i].setToSet(false);
newFieldList[k] = fields[i];
}
else
if (j < exportedFields.length)
for (;j<exportedFields.length;j++,k++)
{
exportedFields[j].setPersistent(true);
exportedFields[j].setToSet(false);
newFieldList[k] = exportedFields[j];
}
fields = new ObjectStreamField[k];
System.arraycopy(newFieldList, 0, fields, 0, k);
}
catch (NoSuchFieldException ignore)
{
return;
}
catch (IllegalAccessException ignore)
{
return;
}
}
void setSuperclass (ObjectStreamClass osc)
{
superClass = osc;
}
void calculateOffsets()
{
int i;
ObjectStreamField field;
primFieldSize = 0;
int fcount = fields.length;
for (i = 0; i < fcount; ++ i)
{
field = fields[i];
if (! field.isPrimitive())
break;
field.setOffset(primFieldSize);
switch (field.getTypeCode())
{
case 'B':
case 'Z':
++ primFieldSize;
break;
case 'C':
case 'S':
primFieldSize += 2;
break;
case 'I':
case 'F':
primFieldSize += 4;
break;
case 'D':
case 'J':
primFieldSize += 8;
break;
}
}
for (objectFieldCount = 0; i < fcount; ++ i)
fields[i].setOffset(objectFieldCount++);
}
private Method findMethod(Method[] methods, String name, Class[] params,
Class returnType, boolean mustBePrivate)
{
outer:
for (int i = 0; i < methods.length; i++)
{
final Method m = methods[i];
int mods = m.getModifiers();
if (Modifier.isStatic(mods)
|| (mustBePrivate && !Modifier.isPrivate(mods)))
{
continue;
}
if (m.getName().equals(name)
&& m.getReturnType() == returnType)
{
Class[] mp = m.getParameterTypes();
if (mp.length == params.length)
{
for (int j = 0; j < mp.length; j++)
{
if (mp[j] != params[j])
{
continue outer;
}
}
AccessController.doPrivileged(new SetAccessibleAction(m));
return m;
}
}
}
return null;
}
private void cacheMethods()
{
Method[] methods = forClass().getDeclaredMethods();
readObjectMethod = findMethod(methods, "readObject",
new Class[] { ObjectInputStream.class },
Void.TYPE, true);
writeObjectMethod = findMethod(methods, "writeObject",
new Class[] { ObjectOutputStream.class },
Void.TYPE, true);
readResolveMethod = findMethod(methods, "readResolve",
new Class[0], Object.class, false);
writeReplaceMethod = findMethod(methods, "writeReplace",
new Class[0], Object.class, false);
}
private ObjectStreamClass(Class cl)
{
uid = 0;
flags = 0;
isProxyClass = Proxy.isProxyClass(cl);
clazz = cl;
cacheMethods();
name = cl.getName();
setFlags(cl);
setFields(cl);
if ( (Serializable.class).isAssignableFrom(cl) && !isProxyClass)
uid = getClassUID(cl);
superClass = lookup(cl.getSuperclass());
}
private void setFlags(Class cl)
{
if ((java.io.Externalizable.class).isAssignableFrom(cl))
flags |= ObjectStreamConstants.SC_EXTERNALIZABLE;
else if ((java.io.Serializable.class).isAssignableFrom(cl))
flags |= ObjectStreamConstants.SC_SERIALIZABLE;
if (writeObjectMethod != null)
flags |= ObjectStreamConstants.SC_WRITE_METHOD;
}
private void setFields(Class cl)
{
SetAccessibleAction setAccessible = new SetAccessibleAction();
if (!isSerializable() || isExternalizable())
{
fields = NO_FIELDS;
return;
}
try
{
final Field f =
cl.getDeclaredField("serialPersistentFields");
setAccessible.setMember(f);
AccessController.doPrivileged(setAccessible);
int modifiers = f.getModifiers();
if (Modifier.isStatic(modifiers)
&& Modifier.isFinal(modifiers)
&& Modifier.isPrivate(modifiers))
{
fields = getSerialPersistentFields(cl);
if (fields != null)
{
Arrays.sort (fields);
for (int i=0; i < fields.length; i++)
{
try
{
fields[i].lookupField(cl);
}
catch (NoSuchFieldException _)
{
fields[i].setToSet(false);
}
}
calculateOffsets();
return;
}
}
}
catch (NoSuchFieldException ignore)
{
}
catch (IllegalAccessException ignore)
{
}
int num_good_fields = 0;
Field[] all_fields = cl.getDeclaredFields();
int modifiers;
for (int i = 0; i < all_fields.length; i++)
{
modifiers = all_fields[i].getModifiers();
if (Modifier.isTransient(modifiers)
|| Modifier.isStatic(modifiers))
all_fields[i] = null;
else
num_good_fields++;
}
fields = new ObjectStreamField[ num_good_fields ];
for (int from = 0, to = 0; from < all_fields.length; from++)
if (all_fields[from] != null)
{
final Field f = all_fields[from];
setAccessible.setMember(f);
AccessController.doPrivileged(setAccessible);
fields[to] = new ObjectStreamField(all_fields[from]);
to++;
}
Arrays.sort(fields);
for (int i = 1; i < fields.length; i++)
{
if(fields[i - 1].getName().equals(fields[i].getName()))
throw new InternalError("Duplicate field " +
fields[i].getName() + " in class " + cl.getName());
}
calculateOffsets();
}
private long getClassUID(Class cl)
{
try
{
final Field suid = cl.getDeclaredField("serialVersionUID");
SetAccessibleAction setAccessible = new SetAccessibleAction(suid);
AccessController.doPrivileged(setAccessible);
int modifiers = suid.getModifiers();
if (Modifier.isStatic(modifiers)
&& Modifier.isFinal(modifiers)
&& suid.getType() == Long.TYPE)
return suid.getLong(null);
}
catch (NoSuchFieldException ignore)
{
}
catch (IllegalAccessException ignore)
{
}
try
{
MessageDigest md;
try
{
md = MessageDigest.getInstance("SHA");
}
catch (NoSuchAlgorithmException e)
{
Gnu gnuProvider = new Gnu();
Security.addProvider(gnuProvider);
md = MessageDigest.getInstance("SHA");
}
DigestOutputStream digest_out =
new DigestOutputStream(nullOutputStream, md);
DataOutputStream data_out = new DataOutputStream(digest_out);
data_out.writeUTF(cl.getName());
int modifiers = cl.getModifiers();
modifiers = modifiers & (Modifier.ABSTRACT | Modifier.FINAL
| Modifier.INTERFACE | Modifier.PUBLIC);
data_out.writeInt(modifiers);
if (! cl.isArray())
{
Class[] interfaces = cl.getInterfaces();
Arrays.sort(interfaces, interfaceComparator);
for (int i = 0; i < interfaces.length; i++)
data_out.writeUTF(interfaces[i].getName());
}
Field field;
Field[] fields = cl.getDeclaredFields();
Arrays.sort(fields, memberComparator);
for (int i = 0; i < fields.length; i++)
{
field = fields[i];
modifiers = field.getModifiers();
if (Modifier.isPrivate(modifiers)
&& (Modifier.isStatic(modifiers)
|| Modifier.isTransient(modifiers)))
continue;
data_out.writeUTF(field.getName());
data_out.writeInt(modifiers);
data_out.writeUTF(TypeSignature.getEncodingOfClass (field.getType()));
}
if (VMObjectStreamClass.hasClassInitializer(cl))
{
data_out.writeUTF("<clinit>");
data_out.writeInt(Modifier.STATIC);
data_out.writeUTF("()V");
}
Constructor constructor;
Constructor[] constructors = cl.getDeclaredConstructors();
Arrays.sort (constructors, memberComparator);
for (int i = 0; i < constructors.length; i++)
{
constructor = constructors[i];
modifiers = constructor.getModifiers();
if (Modifier.isPrivate(modifiers))
continue;
data_out.writeUTF("<init>");
data_out.writeInt(modifiers);
data_out.writeUTF
(TypeSignature.getEncodingOfConstructor(constructor).replace('/','.'));
}
Method method;
Method[] methods = cl.getDeclaredMethods();
Arrays.sort(methods, memberComparator);
for (int i = 0; i < methods.length; i++)
{
method = methods[i];
modifiers = method.getModifiers();
if (Modifier.isPrivate(modifiers))
continue;
data_out.writeUTF(method.getName());
data_out.writeInt(modifiers);
data_out.writeUTF
(TypeSignature.getEncodingOfMethod(method).replace('/', '.'));
}
data_out.close();
byte[] sha = md.digest();
long result = 0;
int len = sha.length < 8 ? sha.length : 8;
for (int i = 0; i < len; i++)
result += (long) (sha[i] & 0xFF) << (8 * i);
return result;
}
catch (NoSuchAlgorithmException e)
{
throw new RuntimeException
("The SHA algorithm was not found to use in computing the Serial Version UID for class "
+ cl.getName(), e);
}
catch (IOException ioe)
{
throw new RuntimeException(ioe);
}
}
private ObjectStreamField[] getSerialPersistentFields(Class clazz)
throws NoSuchFieldException, IllegalAccessException
{
ObjectStreamField[] fieldsArray = null;
ObjectStreamField[] o;
Field f = clazz.getDeclaredField("serialPersistentFields");
f.setAccessible(true);
int modifiers = f.getModifiers();
if (!(Modifier.isStatic(modifiers) &&
Modifier.isFinal(modifiers) &&
Modifier.isPrivate(modifiers)))
return null;
o = (ObjectStreamField[]) f.get(null);
if (o == null)
return null;
fieldsArray = new ObjectStreamField[ o.length ];
System.arraycopy(o, 0, fieldsArray, 0, o.length);
return fieldsArray;
}
Externalizable newInstance() throws InvalidClassException
{
synchronized(this)
{
if (constructor == null)
{
try
{
final Constructor c = clazz.getConstructor(new Class[0]);
AccessController.doPrivileged(new PrivilegedAction()
{
public Object run()
{
c.setAccessible(true);
return null;
}
});
constructor = c;
}
catch(NoSuchMethodException x)
{
throw new InvalidClassException(clazz.getName(),
"No public zero-argument constructor");
}
}
}
try
{
return (Externalizable)constructor.newInstance(null);
}
catch(Exception x)
{
throw (InvalidClassException)
new InvalidClassException(clazz.getName(),
"Unable to instantiate").initCause(x);
}
}
public static final ObjectStreamField[] NO_FIELDS = {};
private static Hashtable classLookupTable = new Hashtable();
private static final NullOutputStream nullOutputStream = new NullOutputStream();
private static final Comparator interfaceComparator = new InterfaceComparator();
private static final Comparator memberComparator = new MemberComparator();
private static final
Class[] writeMethodArgTypes = { java.io.ObjectOutputStream.class };
private ObjectStreamClass superClass;
private Class clazz;
private String name;
private long uid;
private byte flags;
ObjectStreamField[] fields;
int primFieldSize = -1; int objectFieldCount;
Method readObjectMethod;
Method readResolveMethod;
Method writeReplaceMethod;
Method writeObjectMethod;
boolean realClassIsSerializable;
boolean realClassIsExternalizable;
ObjectStreamField[] fieldMapping;
Constructor firstNonSerializableParentConstructor;
private Constructor constructor;
boolean isProxyClass = false;
private static final long serialVersionUID = -6120832682080437368L;
private static final class InterfaceComparator implements Comparator
{
public int compare(Object o1, Object o2)
{
return ((Class) o1).getName().compareTo(((Class) o2).getName());
}
}
private static final class MemberComparator implements Comparator
{
public int compare(Object o1, Object o2)
{
Member m1 = (Member) o1;
Member m2 = (Member) o2;
int comp = m1.getName().compareTo(m2.getName());
if (comp == 0)
return TypeSignature.getEncodingOfMember(m1).
compareTo(TypeSignature.getEncodingOfMember(m2));
else
return comp;
}
}
}