fdc9b3a02b
From-SVN: r95381
930 lines
25 KiB
Java
930 lines
25 KiB
Java
/* ObjectStreamClass.java -- Class used to write class information
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about serialized objects.
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Copyright (C) 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.io;
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import gnu.java.io.NullOutputStream;
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import gnu.java.lang.reflect.TypeSignature;
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import gnu.java.security.action.SetAccessibleAction;
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import gnu.java.security.provider.Gnu;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Member;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.lang.reflect.Proxy;
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import java.security.AccessController;
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import java.security.DigestOutputStream;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.security.PrivilegedAction;
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import java.security.Security;
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import java.util.Arrays;
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import java.util.Comparator;
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import java.util.Hashtable;
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import java.util.Vector;
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public class ObjectStreamClass implements Serializable
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{
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/**
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* Returns the <code>ObjectStreamClass</code> for <code>cl</code>.
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* If <code>cl</code> is null, or is not <code>Serializable</code>,
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* null is returned. <code>ObjectStreamClass</code>'s are memorized;
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* later calls to this method with the same class will return the
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* same <code>ObjectStreamClass</code> object and no recalculation
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* will be done.
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*
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* @see java.io.Serializable
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*/
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public static ObjectStreamClass lookup(Class cl)
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{
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if (cl == null)
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return null;
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if (! (Serializable.class).isAssignableFrom(cl))
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return null;
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return lookupForClassObject(cl);
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}
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/**
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* This lookup for internal use by ObjectOutputStream. Suppose
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* we have a java.lang.Class object C for class A, though A is not
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* serializable, but it's okay to serialize C.
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*/
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static ObjectStreamClass lookupForClassObject(Class cl)
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{
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if (cl == null)
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return null;
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ObjectStreamClass osc = (ObjectStreamClass) classLookupTable.get(cl);
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if (osc != null)
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return osc;
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else
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{
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osc = new ObjectStreamClass(cl);
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classLookupTable.put(cl, osc);
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return osc;
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}
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}
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/**
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* Returns the name of the class that this
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* <code>ObjectStreamClass</code> represents.
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*
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* @return the name of the class.
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*/
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public String getName()
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{
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return name;
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}
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/**
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* Returns the class that this <code>ObjectStreamClass</code>
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* represents. Null could be returned if this
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* <code>ObjectStreamClass</code> was read from an
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* <code>ObjectInputStream</code> and the class it represents cannot
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* be found or loaded.
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*
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* @see java.io.ObjectInputStream
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*/
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public Class forClass()
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{
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return clazz;
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}
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/**
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* Returns the serial version stream-unique identifier for the class
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* represented by this <code>ObjectStreamClass</code>. This SUID is
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* either defined by the class as <code>static final long
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* serialVersionUID</code> or is calculated as specified in
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* Javasoft's "Object Serialization Specification" XXX: add reference
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*
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* @return the serial version UID.
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*/
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public long getSerialVersionUID()
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{
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return uid;
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}
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/**
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* Returns the serializable (non-static and non-transient) Fields
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* of the class represented by this ObjectStreamClass. The Fields
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* are sorted by name.
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*
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* @return the fields.
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*/
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public ObjectStreamField[] getFields()
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{
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ObjectStreamField[] copy = new ObjectStreamField[ fields.length ];
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System.arraycopy(fields, 0, copy, 0, fields.length);
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return copy;
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}
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// XXX doc
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// Can't do binary search since fields is sorted by name and
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// primitiveness.
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public ObjectStreamField getField (String name)
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{
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for (int i = 0; i < fields.length; i++)
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if (fields[i].getName().equals(name))
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return fields[i];
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return null;
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}
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/**
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* Returns a textual representation of this
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* <code>ObjectStreamClass</code> object including the name of the
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* class it represents as well as that class's serial version
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* stream-unique identifier.
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*
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* @see #getSerialVersionUID()
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* @see #getName()
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*/
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public String toString()
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{
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return "java.io.ObjectStreamClass< " + name + ", " + uid + " >";
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}
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// Returns true iff the class that this ObjectStreamClass represents
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// has the following method:
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//
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// private void writeObject (ObjectOutputStream)
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//
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// This method is used by the class to override default
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// serialization behavior.
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boolean hasWriteMethod()
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{
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return (flags & ObjectStreamConstants.SC_WRITE_METHOD) != 0;
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}
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// Returns true iff the class that this ObjectStreamClass represents
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// implements Serializable but does *not* implement Externalizable.
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boolean isSerializable()
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{
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return (flags & ObjectStreamConstants.SC_SERIALIZABLE) != 0;
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}
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// Returns true iff the class that this ObjectStreamClass represents
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// implements Externalizable.
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boolean isExternalizable()
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{
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return (flags & ObjectStreamConstants.SC_EXTERNALIZABLE) != 0;
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}
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// Returns the <code>ObjectStreamClass</code> that represents the
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// class that is the superclass of the class this
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// <code>ObjectStreamClass</code> represents. If the superclass is
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// not Serializable, null is returned.
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ObjectStreamClass getSuper()
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{
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return superClass;
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}
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// returns an array of ObjectStreamClasses that represent the super
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// classes of CLAZZ and CLAZZ itself in order from most super to
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// CLAZZ. ObjectStreamClass[0] is the highest superclass of CLAZZ
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// that is serializable.
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static ObjectStreamClass[] getObjectStreamClasses(Class clazz)
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{
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ObjectStreamClass osc = ObjectStreamClass.lookup(clazz);
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if (osc == null)
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return new ObjectStreamClass[0];
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else
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{
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Vector oscs = new Vector();
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while (osc != null)
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{
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oscs.addElement (osc);
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osc = osc.getSuper();
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}
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int count = oscs.size();
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ObjectStreamClass[] sorted_oscs = new ObjectStreamClass[ count ];
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for (int i = count - 1; i >= 0; i--)
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sorted_oscs[ count - i - 1 ] = (ObjectStreamClass) oscs.elementAt(i);
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return sorted_oscs;
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}
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}
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// Returns an integer that consists of bit-flags that indicate
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// properties of the class represented by this ObjectStreamClass.
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// The bit-flags that could be present are those defined in
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// ObjectStreamConstants that begin with `SC_'
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int getFlags()
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{
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return flags;
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}
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ObjectStreamClass(String name, long uid, byte flags,
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ObjectStreamField[] fields)
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{
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this.name = name;
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this.uid = uid;
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this.flags = flags;
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this.fields = fields;
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}
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/**
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* This method builds the internal description corresponding to a Java Class.
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* As the constructor only assign a name to the current ObjectStreamClass instance,
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* that method sets the serial UID, chose the fields which will be serialized,
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* and compute the position of the fields in the serialized stream.
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*
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* @param cl The Java class which is used as a reference for building the descriptor.
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* @param superClass The descriptor of the super class for this class descriptor.
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* @throws InvalidClassException if an incompatibility between computed UID and
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* already set UID is found.
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*/
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void setClass(Class cl, ObjectStreamClass superClass) throws InvalidClassException
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{
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this.clazz = cl;
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cacheMethods();
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long class_uid = getClassUID(cl);
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if (uid == 0)
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uid = class_uid;
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else
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{
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// Check that the actual UID of the resolved class matches the UID from
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// the stream.
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if (uid != class_uid)
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{
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String msg = cl +
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": Local class not compatible: stream serialVersionUID="
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+ uid + ", local serialVersionUID=" + class_uid;
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throw new InvalidClassException (msg);
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}
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}
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isProxyClass = clazz != null && Proxy.isProxyClass(clazz);
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this.superClass = superClass;
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calculateOffsets();
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try
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{
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ObjectStreamField[] exportedFields = getSerialPersistentFields (clazz);
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if (exportedFields == null)
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return;
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ObjectStreamField[] newFieldList = new ObjectStreamField[exportedFields.length + fields.length];
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int i, j, k;
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/* We now check the import fields against the exported fields.
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* There should not be contradiction (e.g. int x and String x)
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* but extra virtual fields can be added to the class.
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*/
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Arrays.sort(exportedFields);
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i = 0; j = 0; k = 0;
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while (i < fields.length && j < exportedFields.length)
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{
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int comp = fields[i].compareTo(exportedFields[j]);
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if (comp < 0)
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{
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newFieldList[k] = fields[i];
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fields[i].setPersistent(false);
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fields[i].setToSet(false);
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i++;
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}
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else if (comp > 0)
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{
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/* field not found in imported fields. We add it
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* in the list of supported fields.
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*/
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newFieldList[k] = exportedFields[j];
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newFieldList[k].setPersistent(true);
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newFieldList[k].setToSet(false);
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try
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{
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newFieldList[k].lookupField(clazz);
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newFieldList[k].checkFieldType();
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}
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catch (NoSuchFieldException _)
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{
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}
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j++;
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}
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else
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{
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try
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{
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exportedFields[j].lookupField(clazz);
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exportedFields[j].checkFieldType();
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}
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catch (NoSuchFieldException _)
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{
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}
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if (!fields[i].getType().equals(exportedFields[j].getType()))
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throw new InvalidClassException
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("serialPersistentFields must be compatible with" +
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" imported fields (about " + fields[i].getName() + ")");
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newFieldList[k] = fields[i];
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fields[i].setPersistent(true);
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i++;
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j++;
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}
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k++;
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}
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if (i < fields.length)
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for (;i<fields.length;i++,k++)
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{
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fields[i].setPersistent(false);
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fields[i].setToSet(false);
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newFieldList[k] = fields[i];
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}
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else
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if (j < exportedFields.length)
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for (;j<exportedFields.length;j++,k++)
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{
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exportedFields[j].setPersistent(true);
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exportedFields[j].setToSet(false);
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newFieldList[k] = exportedFields[j];
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}
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fields = new ObjectStreamField[k];
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System.arraycopy(newFieldList, 0, fields, 0, k);
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}
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catch (NoSuchFieldException ignore)
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{
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return;
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}
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catch (IllegalAccessException ignore)
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{
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return;
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}
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}
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void setSuperclass (ObjectStreamClass osc)
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{
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superClass = osc;
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}
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void calculateOffsets()
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{
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int i;
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ObjectStreamField field;
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primFieldSize = 0;
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int fcount = fields.length;
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for (i = 0; i < fcount; ++ i)
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{
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field = fields[i];
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if (! field.isPrimitive())
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break;
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field.setOffset(primFieldSize);
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switch (field.getTypeCode())
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{
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case 'B':
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case 'Z':
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++ primFieldSize;
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break;
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case 'C':
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case 'S':
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primFieldSize += 2;
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break;
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case 'I':
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case 'F':
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primFieldSize += 4;
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break;
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case 'D':
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case 'J':
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primFieldSize += 8;
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break;
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}
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}
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for (objectFieldCount = 0; i < fcount; ++ i)
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fields[i].setOffset(objectFieldCount++);
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}
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private Method findMethod(Method[] methods, String name, Class[] params,
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Class returnType, boolean mustBePrivate)
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{
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outer:
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for (int i = 0; i < methods.length; i++)
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{
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final Method m = methods[i];
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int mods = m.getModifiers();
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if (Modifier.isStatic(mods)
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|| (mustBePrivate && !Modifier.isPrivate(mods)))
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{
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continue;
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}
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if (m.getName().equals(name)
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&& m.getReturnType() == returnType)
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{
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Class[] mp = m.getParameterTypes();
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if (mp.length == params.length)
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{
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for (int j = 0; j < mp.length; j++)
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{
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if (mp[j] != params[j])
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{
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continue outer;
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}
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}
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AccessController.doPrivileged(new SetAccessibleAction(m));
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return m;
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}
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}
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}
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return null;
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}
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private void cacheMethods()
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{
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Method[] methods = forClass().getDeclaredMethods();
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readObjectMethod = findMethod(methods, "readObject",
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new Class[] { ObjectInputStream.class },
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Void.TYPE, true);
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writeObjectMethod = findMethod(methods, "writeObject",
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new Class[] { ObjectOutputStream.class },
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Void.TYPE, true);
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readResolveMethod = findMethod(methods, "readResolve",
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new Class[0], Object.class, false);
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writeReplaceMethod = findMethod(methods, "writeReplace",
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new Class[0], Object.class, false);
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}
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private ObjectStreamClass(Class cl)
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{
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uid = 0;
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flags = 0;
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isProxyClass = Proxy.isProxyClass(cl);
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clazz = cl;
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cacheMethods();
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name = cl.getName();
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setFlags(cl);
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setFields(cl);
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// to those class nonserializable, its uid field is 0
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if ( (Serializable.class).isAssignableFrom(cl) && !isProxyClass)
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uid = getClassUID(cl);
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superClass = lookup(cl.getSuperclass());
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}
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// Sets bits in flags according to features of CL.
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private void setFlags(Class cl)
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{
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if ((java.io.Externalizable.class).isAssignableFrom(cl))
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flags |= ObjectStreamConstants.SC_EXTERNALIZABLE;
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else if ((java.io.Serializable.class).isAssignableFrom(cl))
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// only set this bit if CL is NOT Externalizable
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flags |= ObjectStreamConstants.SC_SERIALIZABLE;
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if (writeObjectMethod != null)
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flags |= ObjectStreamConstants.SC_WRITE_METHOD;
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}
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// Sets fields to be a sorted array of the serializable fields of
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// clazz.
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private void setFields(Class cl)
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{
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SetAccessibleAction setAccessible = new SetAccessibleAction();
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if (!isSerializable() || isExternalizable())
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{
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fields = NO_FIELDS;
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return;
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}
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try
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{
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final Field f =
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cl.getDeclaredField("serialPersistentFields");
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setAccessible.setMember(f);
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AccessController.doPrivileged(setAccessible);
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int modifiers = f.getModifiers();
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if (Modifier.isStatic(modifiers)
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&& Modifier.isFinal(modifiers)
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&& Modifier.isPrivate(modifiers))
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{
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fields = getSerialPersistentFields(cl);
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if (fields != null)
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{
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Arrays.sort (fields);
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// Retrieve field reference.
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for (int i=0; i < fields.length; i++)
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{
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try
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{
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fields[i].lookupField(cl);
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}
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catch (NoSuchFieldException _)
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{
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fields[i].setToSet(false);
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}
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}
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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;
|
|
}
|
|
}
|
|
}
|