+++ /dev/null
-/* ObjectStreamClass.java -- Class used to write class information
- about serialized objects.
- Copyright (C) 1998, 1999, 2000, 2001, 2003 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.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
-{
- /**
- * Returns the <code>ObjectStreamClass</code> for <code>cl</code>.
- * If <code>cl</code> is null, or is not <code>Serializable</code>,
- * null is returned. <code>ObjectStreamClass</code>'s are memorized;
- * later calls to this method with the same class will return the
- * same <code>ObjectStreamClass</code> object and no recalculation
- * will be done.
- *
- * @see java.io.Serializable
- */
- public static ObjectStreamClass lookup(Class cl)
- {
- if (cl == null)
- return null;
- if (! (Serializable.class).isAssignableFrom(cl))
- return null;
-
- return lookupForClassObject(cl);
- }
-
- /**
- * This lookup for internal use by ObjectOutputStream. Suppose
- * we have a java.lang.Class object C for class A, though A is not
- * serializable, but it's okay to serialize C.
- */
- 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;
- }
- }
-
- /**
- * Returns the name of the class that this
- * <code>ObjectStreamClass</code> represents.
- *
- * @return the name of the class.
- */
- public String getName()
- {
- return name;
- }
-
- /**
- * Returns the class that this <code>ObjectStreamClass</code>
- * represents. Null could be returned if this
- * <code>ObjectStreamClass</code> was read from an
- * <code>ObjectInputStream</code> and the class it represents cannot
- * be found or loaded.
- *
- * @see java.io.ObjectInputStream
- */
- public Class forClass()
- {
- return clazz;
- }
-
- /**
- * Returns the serial version stream-unique identifier for the class
- * represented by this <code>ObjectStreamClass</code>. This SUID is
- * either defined by the class as <code>static final long
- * serialVersionUID</code> or is calculated as specified in
- * Javasoft's "Object Serialization Specification" XXX: add reference
- *
- * @return the serial version UID.
- */
- public long getSerialVersionUID()
- {
- return uid;
- }
-
- /**
- * Returns the serializable (non-static and non-transient) Fields
- * of the class represented by this ObjectStreamClass. The Fields
- * are sorted by name.
- *
- * @return the fields.
- */
- public ObjectStreamField[] getFields()
- {
- ObjectStreamField[] copy = new ObjectStreamField[ fields.length ];
- System.arraycopy(fields, 0, copy, 0, fields.length);
- return copy;
- }
-
- // XXX doc
- // Can't do binary search since fields is sorted by name and
- // primitiveness.
- public ObjectStreamField getField (String name)
- {
- for (int i = 0; i < fields.length; i++)
- if (fields[i].getName().equals(name))
- return fields[i];
- return null;
- }
-
- /**
- * Returns a textual representation of this
- * <code>ObjectStreamClass</code> object including the name of the
- * class it represents as well as that class's serial version
- * stream-unique identifier.
- *
- * @see #getSerialVersionUID()
- * @see #getName()
- */
- public String toString()
- {
- return "java.io.ObjectStreamClass< " + name + ", " + uid + " >";
- }
-
- // Returns true iff the class that this ObjectStreamClass represents
- // has the following method:
- //
- // private void writeObject (ObjectOutputStream)
- //
- // This method is used by the class to override default
- // serialization behavior.
- boolean hasWriteMethod()
- {
- return (flags & ObjectStreamConstants.SC_WRITE_METHOD) != 0;
- }
-
- // Returns true iff the class that this ObjectStreamClass represents
- // implements Serializable but does *not* implement Externalizable.
- boolean isSerializable()
- {
- return (flags & ObjectStreamConstants.SC_SERIALIZABLE) != 0;
- }
-
-
- // Returns true iff the class that this ObjectStreamClass represents
- // implements Externalizable.
- boolean isExternalizable()
- {
- return (flags & ObjectStreamConstants.SC_EXTERNALIZABLE) != 0;
- }
-
-
- // Returns the <code>ObjectStreamClass</code> that represents the
- // class that is the superclass of the class this
- // <code>ObjectStreamClass</code> represents. If the superclass is
- // not Serializable, null is returned.
- ObjectStreamClass getSuper()
- {
- return superClass;
- }
-
-
- // returns an array of ObjectStreamClasses that represent the super
- // classes of CLAZZ and CLAZZ itself in order from most super to
- // CLAZZ. ObjectStreamClass[0] is the highest superclass of CLAZZ
- // that is serializable.
- 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;
- }
- }
-
-
- // Returns an integer that consists of bit-flags that indicate
- // properties of the class represented by this ObjectStreamClass.
- // The bit-flags that could be present are those defined in
- // ObjectStreamConstants that begin with `SC_'
- 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;
- }
-
- /**
- * This method builds the internal description corresponding to a Java Class.
- * As the constructor only assign a name to the current ObjectStreamClass instance,
- * that method sets the serial UID, chose the fields which will be serialized,
- * and compute the position of the fields in the serialized stream.
- *
- * @param cl The Java class which is used as a reference for building the descriptor.
- * @param superClass The descriptor of the super class for this class descriptor.
- * @throws InvalidClassException if an incompatibility between computed UID and
- * already set UID is found.
- */
- void setClass(Class cl, ObjectStreamClass superClass) throws InvalidClassException
- {
- this.clazz = cl;
-
- cacheMethods();
-
- long class_uid = getClassUID(cl);
- if (uid == 0)
- uid = class_uid;
- else
- {
- // Check that the actual UID of the resolved class matches the UID from
- // the stream.
- 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;
-
- /* We now check the import fields against the exported fields.
- * There should not be contradiction (e.g. int x and String x)
- * but extra virtual fields can be added to the class.
- */
-
- 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)
- {
- /* field not found in imported fields. We add it
- * in the list of supported fields.
- */
- 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 static boolean inSamePackage(Class c1, Class c2)
- {
- String name1 = c1.getName();
- String name2 = c2.getName();
-
- int id1 = name1.lastIndexOf('.');
- int id2 = name2.lastIndexOf('.');
-
- // Handle the default package
- if (id1 == -1 || id2 == -1)
- return id1 == id2;
-
- String package1 = name1.substring(0, id1);
- String package2 = name2.substring(0, id2);
-
- return package1.equals(package2);
- }
-
- final static Class[] noArgs = new Class[0];
-
- private static Method findAccessibleMethod(String name, Class from)
- {
- for (Class c = from; c != null; c = c.getSuperclass())
- {
- try
- {
- Method res = c.getDeclaredMethod(name, noArgs);
- int mods = res.getModifiers();
-
- if (c == from
- || Modifier.isProtected(mods)
- || Modifier.isPublic(mods)
- || (! Modifier.isPrivate(mods) && inSamePackage(c, from)))
- {
- AccessController.doPrivileged(new SetAccessibleAction(res));
- return res;
- }
- }
- catch (NoSuchMethodException e)
- {
- }
- }
-
- 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);
-
- // readResolve and writeReplace can be in parent classes, as long as they
- // are accessible from this class.
- readResolveMethod = findAccessibleMethod("readResolve", forClass());
- writeReplaceMethod = findAccessibleMethod("writeReplace", forClass());
- }
-
- private ObjectStreamClass(Class cl)
- {
- uid = 0;
- flags = 0;
- isProxyClass = Proxy.isProxyClass(cl);
-
- clazz = cl;
- cacheMethods();
- name = cl.getName();
- setFlags(cl);
- setFields(cl);
- // to those class nonserializable, its uid field is 0
- if ( (Serializable.class).isAssignableFrom(cl) && !isProxyClass)
- uid = getClassUID(cl);
- superClass = lookup(cl.getSuperclass());
- }
-
-
- // Sets bits in flags according to features of CL.
- private void setFlags(Class cl)
- {
- if ((java.io.Externalizable.class).isAssignableFrom(cl))
- flags |= ObjectStreamConstants.SC_EXTERNALIZABLE;
- else if ((java.io.Serializable.class).isAssignableFrom(cl))
- // only set this bit if CL is NOT Externalizable
- flags |= ObjectStreamConstants.SC_SERIALIZABLE;
-
- if (writeObjectMethod != null)
- flags |= ObjectStreamConstants.SC_WRITE_METHOD;
- }
-
-
- // Sets fields to be a sorted array of the serializable fields of
- // clazz.
- 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);
- // Retrieve field reference.
- 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;
- // set non-serializable fields to null in all_fields
- 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++;
- }
-
- // make a copy of serializable (non-null) 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);
- // Make sure we don't have any duplicate field names
- // (Sun JDK 1.4.1. throws an Internal Error as well)
- 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();
- }
-
- // Returns the serial version UID defined by class, or if that
- // isn't present, calculates value of serial version UID.
- private long getClassUID(Class cl)
- {
- try
- {
- // Use getDeclaredField rather than getField, since serialVersionUID
- // may not be public AND we only want the serialVersionUID of this
- // class, not a superclass or interface.
- 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)
- {
- }
-
- // cl didn't define serialVersionUID, so we have to compute it
- try
- {
- MessageDigest md;
- try
- {
- md = MessageDigest.getInstance("SHA");
- }
- catch (NoSuchAlgorithmException e)
- {
- // If a provider already provides SHA, use it; otherwise, use this.
- 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();
- // just look at interesting bits
- modifiers = modifiers & (Modifier.ABSTRACT | Modifier.FINAL
- | Modifier.INTERFACE | Modifier.PUBLIC);
- data_out.writeInt(modifiers);
-
- // Pretend that an array has no interfaces, because when array
- // serialization was defined (JDK 1.1), arrays didn't have it.
- 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()));
- }
-
- // write class initializer method if present
- 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);
-
- // the replacement of '/' with '.' was needed to make computed
- // SUID's agree with those computed by JDK
- 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);
-
- // the replacement of '/' with '.' was needed to make computed
- // SUID's agree with those computed by JDK
- 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);
- }
- }
-
- /**
- * Returns the value of CLAZZ's private static final field named
- * `serialPersistentFields'. It performs some sanity checks before
- * returning the real array. Besides, the returned array is a clean
- * copy of the original. So it can be modified.
- *
- * @param clazz Class to retrieve 'serialPersistentFields' from.
- * @return The content of 'serialPersistentFields'.
- */
- private ObjectStreamField[] getSerialPersistentFields(Class clazz)
- throws NoSuchFieldException, IllegalAccessException
- {
- ObjectStreamField[] fieldsArray = null;
- ObjectStreamField[] o;
-
- // Use getDeclaredField rather than getField for the same reason
- // as above in getDefinedSUID.
- 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;
- }
-
- /**
- * Returns a new instance of the Class this ObjectStreamClass corresponds
- * to.
- * Note that this should only be used for Externalizable classes.
- *
- * @return A new instance.
- */
- 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;
-
- // this field is package protected so that ObjectInputStream and
- // ObjectOutputStream can access it directly
- ObjectStreamField[] fields;
-
- // these are accessed by ObjectIn/OutputStream
- int primFieldSize = -1; // -1 if not yet calculated
- int objectFieldCount;
-
- Method readObjectMethod;
- Method readResolveMethod;
- Method writeReplaceMethod;
- Method writeObjectMethod;
- boolean realClassIsSerializable;
- boolean realClassIsExternalizable;
- ObjectStreamField[] fieldMapping;
- Constructor firstNonSerializableParentConstructor;
- private Constructor constructor; // default constructor for Externalizable
-
- boolean isProxyClass = false;
-
- // This is probably not necessary because this class is special cased already
- // but it will avoid showing up as a discrepancy when comparing SUIDs.
- private static final long serialVersionUID = -6120832682080437368L;
-
-
- // interfaces are compared only by name
- private static final class InterfaceComparator implements Comparator
- {
- public int compare(Object o1, Object o2)
- {
- return ((Class) o1).getName().compareTo(((Class) o2).getName());
- }
- }
-
-
- // Members (Methods and Constructors) are compared first by name,
- // conflicts are resolved by comparing type signatures
- 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;
- }
- }
-}
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