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jlechner |
/* 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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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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273 |
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/**
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275 |
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* This method builds the internal description corresponding to a Java Class.
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276 |
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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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282 |
|
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* @throws InvalidClassException if an incompatibility between computed UID and
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283 |
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* already set UID is found.
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*/
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285 |
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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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289 |
|
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cacheMethods();
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290 |
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291 |
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long class_uid = getClassUID(cl);
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292 |
|
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if (uid == 0)
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uid = class_uid;
|
294 |
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else
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295 |
|
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{
|
296 |
|
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// Check that the actual UID of the resolved class matches the UID from
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297 |
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// the stream.
|
298 |
|
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if (uid != class_uid)
|
299 |
|
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{
|
300 |
|
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String msg = cl +
|
301 |
|
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": Local class not compatible: stream serialVersionUID="
|
302 |
|
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+ uid + ", local serialVersionUID=" + class_uid;
|
303 |
|
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throw new InvalidClassException (msg);
|
304 |
|
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}
|
305 |
|
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}
|
306 |
|
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|
307 |
|
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isProxyClass = clazz != null && Proxy.isProxyClass(clazz);
|
308 |
|
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this.superClass = superClass;
|
309 |
|
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calculateOffsets();
|
310 |
|
|
|
311 |
|
|
try
|
312 |
|
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{
|
313 |
|
|
ObjectStreamField[] exportedFields = getSerialPersistentFields (clazz);
|
314 |
|
|
|
315 |
|
|
if (exportedFields == null)
|
316 |
|
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return;
|
317 |
|
|
|
318 |
|
|
ObjectStreamField[] newFieldList = new ObjectStreamField[exportedFields.length + fields.length];
|
319 |
|
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int i, j, k;
|
320 |
|
|
|
321 |
|
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/* We now check the import fields against the exported fields.
|
322 |
|
|
* There should not be contradiction (e.g. int x and String x)
|
323 |
|
|
* but extra virtual fields can be added to the class.
|
324 |
|
|
*/
|
325 |
|
|
|
326 |
|
|
Arrays.sort(exportedFields);
|
327 |
|
|
|
328 |
|
|
i = 0; j = 0; k = 0;
|
329 |
|
|
while (i < fields.length && j < exportedFields.length)
|
330 |
|
|
{
|
331 |
|
|
int comp = fields[i].compareTo(exportedFields[j]);
|
332 |
|
|
|
333 |
|
|
if (comp < 0)
|
334 |
|
|
{
|
335 |
|
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newFieldList[k] = fields[i];
|
336 |
|
|
fields[i].setPersistent(false);
|
337 |
|
|
fields[i].setToSet(false);
|
338 |
|
|
i++;
|
339 |
|
|
}
|
340 |
|
|
else if (comp > 0)
|
341 |
|
|
{
|
342 |
|
|
/* field not found in imported fields. We add it
|
343 |
|
|
* in the list of supported fields.
|
344 |
|
|
*/
|
345 |
|
|
newFieldList[k] = exportedFields[j];
|
346 |
|
|
newFieldList[k].setPersistent(true);
|
347 |
|
|
newFieldList[k].setToSet(false);
|
348 |
|
|
try
|
349 |
|
|
{
|
350 |
|
|
newFieldList[k].lookupField(clazz);
|
351 |
|
|
newFieldList[k].checkFieldType();
|
352 |
|
|
}
|
353 |
|
|
catch (NoSuchFieldException _)
|
354 |
|
|
{
|
355 |
|
|
}
|
356 |
|
|
j++;
|
357 |
|
|
}
|
358 |
|
|
else
|
359 |
|
|
{
|
360 |
|
|
try
|
361 |
|
|
{
|
362 |
|
|
exportedFields[j].lookupField(clazz);
|
363 |
|
|
exportedFields[j].checkFieldType();
|
364 |
|
|
}
|
365 |
|
|
catch (NoSuchFieldException _)
|
366 |
|
|
{
|
367 |
|
|
}
|
368 |
|
|
|
369 |
|
|
if (!fields[i].getType().equals(exportedFields[j].getType()))
|
370 |
|
|
throw new InvalidClassException
|
371 |
|
|
("serialPersistentFields must be compatible with" +
|
372 |
|
|
" imported fields (about " + fields[i].getName() + ")");
|
373 |
|
|
newFieldList[k] = fields[i];
|
374 |
|
|
fields[i].setPersistent(true);
|
375 |
|
|
i++;
|
376 |
|
|
j++;
|
377 |
|
|
}
|
378 |
|
|
k++;
|
379 |
|
|
}
|
380 |
|
|
|
381 |
|
|
if (i < fields.length)
|
382 |
|
|
for (;i<fields.length;i++,k++)
|
383 |
|
|
{
|
384 |
|
|
fields[i].setPersistent(false);
|
385 |
|
|
fields[i].setToSet(false);
|
386 |
|
|
newFieldList[k] = fields[i];
|
387 |
|
|
}
|
388 |
|
|
else
|
389 |
|
|
if (j < exportedFields.length)
|
390 |
|
|
for (;j<exportedFields.length;j++,k++)
|
391 |
|
|
{
|
392 |
|
|
exportedFields[j].setPersistent(true);
|
393 |
|
|
exportedFields[j].setToSet(false);
|
394 |
|
|
newFieldList[k] = exportedFields[j];
|
395 |
|
|
}
|
396 |
|
|
|
397 |
|
|
fields = new ObjectStreamField[k];
|
398 |
|
|
System.arraycopy(newFieldList, 0, fields, 0, k);
|
399 |
|
|
}
|
400 |
|
|
catch (NoSuchFieldException ignore)
|
401 |
|
|
{
|
402 |
|
|
return;
|
403 |
|
|
}
|
404 |
|
|
catch (IllegalAccessException ignore)
|
405 |
|
|
{
|
406 |
|
|
return;
|
407 |
|
|
}
|
408 |
|
|
}
|
409 |
|
|
|
410 |
|
|
void setSuperclass (ObjectStreamClass osc)
|
411 |
|
|
{
|
412 |
|
|
superClass = osc;
|
413 |
|
|
}
|
414 |
|
|
|
415 |
|
|
void calculateOffsets()
|
416 |
|
|
{
|
417 |
|
|
int i;
|
418 |
|
|
ObjectStreamField field;
|
419 |
|
|
primFieldSize = 0;
|
420 |
|
|
int fcount = fields.length;
|
421 |
|
|
for (i = 0; i < fcount; ++ i)
|
422 |
|
|
{
|
423 |
|
|
field = fields[i];
|
424 |
|
|
|
425 |
|
|
if (! field.isPrimitive())
|
426 |
|
|
break;
|
427 |
|
|
|
428 |
|
|
field.setOffset(primFieldSize);
|
429 |
|
|
switch (field.getTypeCode())
|
430 |
|
|
{
|
431 |
|
|
case 'B':
|
432 |
|
|
case 'Z':
|
433 |
|
|
++ primFieldSize;
|
434 |
|
|
break;
|
435 |
|
|
case 'C':
|
436 |
|
|
case 'S':
|
437 |
|
|
primFieldSize += 2;
|
438 |
|
|
break;
|
439 |
|
|
case 'I':
|
440 |
|
|
case 'F':
|
441 |
|
|
primFieldSize += 4;
|
442 |
|
|
break;
|
443 |
|
|
case 'D':
|
444 |
|
|
case 'J':
|
445 |
|
|
primFieldSize += 8;
|
446 |
|
|
break;
|
447 |
|
|
}
|
448 |
|
|
}
|
449 |
|
|
|
450 |
|
|
for (objectFieldCount = 0; i < fcount; ++ i)
|
451 |
|
|
fields[i].setOffset(objectFieldCount++);
|
452 |
|
|
}
|
453 |
|
|
|
454 |
|
|
private Method findMethod(Method[] methods, String name, Class[] params,
|
455 |
|
|
Class returnType, boolean mustBePrivate)
|
456 |
|
|
{
|
457 |
|
|
outer:
|
458 |
|
|
for (int i = 0; i < methods.length; i++)
|
459 |
|
|
{
|
460 |
|
|
final Method m = methods[i];
|
461 |
|
|
int mods = m.getModifiers();
|
462 |
|
|
if (Modifier.isStatic(mods)
|
463 |
|
|
|| (mustBePrivate && !Modifier.isPrivate(mods)))
|
464 |
|
|
{
|
465 |
|
|
continue;
|
466 |
|
|
}
|
467 |
|
|
|
468 |
|
|
if (m.getName().equals(name)
|
469 |
|
|
&& m.getReturnType() == returnType)
|
470 |
|
|
{
|
471 |
|
|
Class[] mp = m.getParameterTypes();
|
472 |
|
|
if (mp.length == params.length)
|
473 |
|
|
{
|
474 |
|
|
for (int j = 0; j < mp.length; j++)
|
475 |
|
|
{
|
476 |
|
|
if (mp[j] != params[j])
|
477 |
|
|
{
|
478 |
|
|
continue outer;
|
479 |
|
|
}
|
480 |
|
|
}
|
481 |
|
|
AccessController.doPrivileged(new SetAccessibleAction(m));
|
482 |
|
|
return m;
|
483 |
|
|
}
|
484 |
|
|
}
|
485 |
|
|
}
|
486 |
|
|
return null;
|
487 |
|
|
}
|
488 |
|
|
|
489 |
|
|
private static boolean inSamePackage(Class c1, Class c2)
|
490 |
|
|
{
|
491 |
|
|
String name1 = c1.getName();
|
492 |
|
|
String name2 = c2.getName();
|
493 |
|
|
|
494 |
|
|
int id1 = name1.lastIndexOf('.');
|
495 |
|
|
int id2 = name2.lastIndexOf('.');
|
496 |
|
|
|
497 |
|
|
// Handle the default package
|
498 |
|
|
if (id1 == -1 || id2 == -1)
|
499 |
|
|
return id1 == id2;
|
500 |
|
|
|
501 |
|
|
String package1 = name1.substring(0, id1);
|
502 |
|
|
String package2 = name2.substring(0, id2);
|
503 |
|
|
|
504 |
|
|
return package1.equals(package2);
|
505 |
|
|
}
|
506 |
|
|
|
507 |
|
|
final static Class[] noArgs = new Class[0];
|
508 |
|
|
|
509 |
|
|
private static Method findAccessibleMethod(String name, Class from)
|
510 |
|
|
{
|
511 |
|
|
for (Class c = from; c != null; c = c.getSuperclass())
|
512 |
|
|
{
|
513 |
|
|
try
|
514 |
|
|
{
|
515 |
|
|
Method res = c.getDeclaredMethod(name, noArgs);
|
516 |
|
|
int mods = res.getModifiers();
|
517 |
|
|
|
518 |
|
|
if (c == from
|
519 |
|
|
|| Modifier.isProtected(mods)
|
520 |
|
|
|| Modifier.isPublic(mods)
|
521 |
|
|
|| (! Modifier.isPrivate(mods) && inSamePackage(c, from)))
|
522 |
|
|
{
|
523 |
|
|
AccessController.doPrivileged(new SetAccessibleAction(res));
|
524 |
|
|
return res;
|
525 |
|
|
}
|
526 |
|
|
}
|
527 |
|
|
catch (NoSuchMethodException e)
|
528 |
|
|
{
|
529 |
|
|
}
|
530 |
|
|
}
|
531 |
|
|
|
532 |
|
|
return null;
|
533 |
|
|
}
|
534 |
|
|
|
535 |
|
|
private void cacheMethods()
|
536 |
|
|
{
|
537 |
|
|
Method[] methods = forClass().getDeclaredMethods();
|
538 |
|
|
|
539 |
|
|
readObjectMethod = findMethod(methods, "readObject",
|
540 |
|
|
new Class[] { ObjectInputStream.class },
|
541 |
|
|
Void.TYPE, true);
|
542 |
|
|
writeObjectMethod = findMethod(methods, "writeObject",
|
543 |
|
|
new Class[] { ObjectOutputStream.class },
|
544 |
|
|
Void.TYPE, true);
|
545 |
|
|
|
546 |
|
|
// readResolve and writeReplace can be in parent classes, as long as they
|
547 |
|
|
// are accessible from this class.
|
548 |
|
|
readResolveMethod = findAccessibleMethod("readResolve", forClass());
|
549 |
|
|
writeReplaceMethod = findAccessibleMethod("writeReplace", forClass());
|
550 |
|
|
}
|
551 |
|
|
|
552 |
|
|
private ObjectStreamClass(Class cl)
|
553 |
|
|
{
|
554 |
|
|
uid = 0;
|
555 |
|
|
flags = 0;
|
556 |
|
|
isProxyClass = Proxy.isProxyClass(cl);
|
557 |
|
|
|
558 |
|
|
clazz = cl;
|
559 |
|
|
cacheMethods();
|
560 |
|
|
name = cl.getName();
|
561 |
|
|
setFlags(cl);
|
562 |
|
|
setFields(cl);
|
563 |
|
|
// to those class nonserializable, its uid field is 0
|
564 |
|
|
if ( (Serializable.class).isAssignableFrom(cl) && !isProxyClass)
|
565 |
|
|
uid = getClassUID(cl);
|
566 |
|
|
superClass = lookup(cl.getSuperclass());
|
567 |
|
|
}
|
568 |
|
|
|
569 |
|
|
|
570 |
|
|
// Sets bits in flags according to features of CL.
|
571 |
|
|
private void setFlags(Class cl)
|
572 |
|
|
{
|
573 |
|
|
if ((java.io.Externalizable.class).isAssignableFrom(cl))
|
574 |
|
|
flags |= ObjectStreamConstants.SC_EXTERNALIZABLE;
|
575 |
|
|
else if ((java.io.Serializable.class).isAssignableFrom(cl))
|
576 |
|
|
// only set this bit if CL is NOT Externalizable
|
577 |
|
|
flags |= ObjectStreamConstants.SC_SERIALIZABLE;
|
578 |
|
|
|
579 |
|
|
if (writeObjectMethod != null)
|
580 |
|
|
flags |= ObjectStreamConstants.SC_WRITE_METHOD;
|
581 |
|
|
}
|
582 |
|
|
|
583 |
|
|
|
584 |
|
|
// Sets fields to be a sorted array of the serializable fields of
|
585 |
|
|
// clazz.
|
586 |
|
|
private void setFields(Class cl)
|
587 |
|
|
{
|
588 |
|
|
SetAccessibleAction setAccessible = new SetAccessibleAction();
|
589 |
|
|
|
590 |
|
|
if (!isSerializable() || isExternalizable())
|
591 |
|
|
{
|
592 |
|
|
fields = NO_FIELDS;
|
593 |
|
|
return;
|
594 |
|
|
}
|
595 |
|
|
|
596 |
|
|
try
|
597 |
|
|
{
|
598 |
|
|
final Field f =
|
599 |
|
|
cl.getDeclaredField("serialPersistentFields");
|
600 |
|
|
setAccessible.setMember(f);
|
601 |
|
|
AccessController.doPrivileged(setAccessible);
|
602 |
|
|
int modifiers = f.getModifiers();
|
603 |
|
|
|
604 |
|
|
if (Modifier.isStatic(modifiers)
|
605 |
|
|
&& Modifier.isFinal(modifiers)
|
606 |
|
|
&& Modifier.isPrivate(modifiers))
|
607 |
|
|
{
|
608 |
|
|
fields = getSerialPersistentFields(cl);
|
609 |
|
|
if (fields != null)
|
610 |
|
|
{
|
611 |
|
|
Arrays.sort (fields);
|
612 |
|
|
// Retrieve field reference.
|
613 |
|
|
for (int i=0; i < fields.length; i++)
|
614 |
|
|
{
|
615 |
|
|
try
|
616 |
|
|
{
|
617 |
|
|
fields[i].lookupField(cl);
|
618 |
|
|
}
|
619 |
|
|
catch (NoSuchFieldException _)
|
620 |
|
|
{
|
621 |
|
|
fields[i].setToSet(false);
|
622 |
|
|
}
|
623 |
|
|
}
|
624 |
|
|
|
625 |
|
|
calculateOffsets();
|
626 |
|
|
return;
|
627 |
|
|
}
|
628 |
|
|
}
|
629 |
|
|
}
|
630 |
|
|
catch (NoSuchFieldException ignore)
|
631 |
|
|
{
|
632 |
|
|
}
|
633 |
|
|
catch (IllegalAccessException ignore)
|
634 |
|
|
{
|
635 |
|
|
}
|
636 |
|
|
|
637 |
|
|
int num_good_fields = 0;
|
638 |
|
|
Field[] all_fields = cl.getDeclaredFields();
|
639 |
|
|
|
640 |
|
|
int modifiers;
|
641 |
|
|
// set non-serializable fields to null in all_fields
|
642 |
|
|
for (int i = 0; i < all_fields.length; i++)
|
643 |
|
|
{
|
644 |
|
|
modifiers = all_fields[i].getModifiers();
|
645 |
|
|
if (Modifier.isTransient(modifiers)
|
646 |
|
|
|| Modifier.isStatic(modifiers))
|
647 |
|
|
all_fields[i] = null;
|
648 |
|
|
else
|
649 |
|
|
num_good_fields++;
|
650 |
|
|
}
|
651 |
|
|
|
652 |
|
|
// make a copy of serializable (non-null) fields
|
653 |
|
|
fields = new ObjectStreamField[ num_good_fields ];
|
654 |
|
|
for (int from = 0, to = 0; from < all_fields.length; from++)
|
655 |
|
|
if (all_fields[from] != null)
|
656 |
|
|
{
|
657 |
|
|
final Field f = all_fields[from];
|
658 |
|
|
setAccessible.setMember(f);
|
659 |
|
|
AccessController.doPrivileged(setAccessible);
|
660 |
|
|
fields[to] = new ObjectStreamField(all_fields[from]);
|
661 |
|
|
to++;
|
662 |
|
|
}
|
663 |
|
|
|
664 |
|
|
Arrays.sort(fields);
|
665 |
|
|
// Make sure we don't have any duplicate field names
|
666 |
|
|
// (Sun JDK 1.4.1. throws an Internal Error as well)
|
667 |
|
|
for (int i = 1; i < fields.length; i++)
|
668 |
|
|
{
|
669 |
|
|
if(fields[i - 1].getName().equals(fields[i].getName()))
|
670 |
|
|
throw new InternalError("Duplicate field " +
|
671 |
|
|
fields[i].getName() + " in class " + cl.getName());
|
672 |
|
|
}
|
673 |
|
|
calculateOffsets();
|
674 |
|
|
}
|
675 |
|
|
|
676 |
|
|
// Returns the serial version UID defined by class, or if that
|
677 |
|
|
// isn't present, calculates value of serial version UID.
|
678 |
|
|
private long getClassUID(Class cl)
|
679 |
|
|
{
|
680 |
|
|
try
|
681 |
|
|
{
|
682 |
|
|
// Use getDeclaredField rather than getField, since serialVersionUID
|
683 |
|
|
// may not be public AND we only want the serialVersionUID of this
|
684 |
|
|
// class, not a superclass or interface.
|
685 |
|
|
final Field suid = cl.getDeclaredField("serialVersionUID");
|
686 |
|
|
SetAccessibleAction setAccessible = new SetAccessibleAction(suid);
|
687 |
|
|
AccessController.doPrivileged(setAccessible);
|
688 |
|
|
int modifiers = suid.getModifiers();
|
689 |
|
|
|
690 |
|
|
if (Modifier.isStatic(modifiers)
|
691 |
|
|
&& Modifier.isFinal(modifiers)
|
692 |
|
|
&& suid.getType() == Long.TYPE)
|
693 |
|
|
return suid.getLong(null);
|
694 |
|
|
}
|
695 |
|
|
catch (NoSuchFieldException ignore)
|
696 |
|
|
{
|
697 |
|
|
}
|
698 |
|
|
catch (IllegalAccessException ignore)
|
699 |
|
|
{
|
700 |
|
|
}
|
701 |
|
|
|
702 |
|
|
// cl didn't define serialVersionUID, so we have to compute it
|
703 |
|
|
try
|
704 |
|
|
{
|
705 |
|
|
MessageDigest md;
|
706 |
|
|
try
|
707 |
|
|
{
|
708 |
|
|
md = MessageDigest.getInstance("SHA");
|
709 |
|
|
}
|
710 |
|
|
catch (NoSuchAlgorithmException e)
|
711 |
|
|
{
|
712 |
|
|
// If a provider already provides SHA, use it; otherwise, use this.
|
713 |
|
|
Gnu gnuProvider = new Gnu();
|
714 |
|
|
Security.addProvider(gnuProvider);
|
715 |
|
|
md = MessageDigest.getInstance("SHA");
|
716 |
|
|
}
|
717 |
|
|
|
718 |
|
|
DigestOutputStream digest_out =
|
719 |
|
|
new DigestOutputStream(nullOutputStream, md);
|
720 |
|
|
DataOutputStream data_out = new DataOutputStream(digest_out);
|
721 |
|
|
|
722 |
|
|
data_out.writeUTF(cl.getName());
|
723 |
|
|
|
724 |
|
|
int modifiers = cl.getModifiers();
|
725 |
|
|
// just look at interesting bits
|
726 |
|
|
modifiers = modifiers & (Modifier.ABSTRACT | Modifier.FINAL
|
727 |
|
|
| Modifier.INTERFACE | Modifier.PUBLIC);
|
728 |
|
|
data_out.writeInt(modifiers);
|
729 |
|
|
|
730 |
|
|
// Pretend that an array has no interfaces, because when array
|
731 |
|
|
// serialization was defined (JDK 1.1), arrays didn't have it.
|
732 |
|
|
if (! cl.isArray())
|
733 |
|
|
{
|
734 |
|
|
Class[] interfaces = cl.getInterfaces();
|
735 |
|
|
Arrays.sort(interfaces, interfaceComparator);
|
736 |
|
|
for (int i = 0; i < interfaces.length; i++)
|
737 |
|
|
data_out.writeUTF(interfaces[i].getName());
|
738 |
|
|
}
|
739 |
|
|
|
740 |
|
|
Field field;
|
741 |
|
|
Field[] fields = cl.getDeclaredFields();
|
742 |
|
|
Arrays.sort(fields, memberComparator);
|
743 |
|
|
for (int i = 0; i < fields.length; i++)
|
744 |
|
|
{
|
745 |
|
|
field = fields[i];
|
746 |
|
|
modifiers = field.getModifiers();
|
747 |
|
|
if (Modifier.isPrivate(modifiers)
|
748 |
|
|
&& (Modifier.isStatic(modifiers)
|
749 |
|
|
|| Modifier.isTransient(modifiers)))
|
750 |
|
|
continue;
|
751 |
|
|
|
752 |
|
|
data_out.writeUTF(field.getName());
|
753 |
|
|
data_out.writeInt(modifiers);
|
754 |
|
|
data_out.writeUTF(TypeSignature.getEncodingOfClass (field.getType()));
|
755 |
|
|
}
|
756 |
|
|
|
757 |
|
|
// write class initializer method if present
|
758 |
|
|
if (VMObjectStreamClass.hasClassInitializer(cl))
|
759 |
|
|
{
|
760 |
|
|
data_out.writeUTF("<clinit>");
|
761 |
|
|
data_out.writeInt(Modifier.STATIC);
|
762 |
|
|
data_out.writeUTF("()V");
|
763 |
|
|
}
|
764 |
|
|
|
765 |
|
|
Constructor constructor;
|
766 |
|
|
Constructor[] constructors = cl.getDeclaredConstructors();
|
767 |
|
|
Arrays.sort (constructors, memberComparator);
|
768 |
|
|
for (int i = 0; i < constructors.length; i++)
|
769 |
|
|
{
|
770 |
|
|
constructor = constructors[i];
|
771 |
|
|
modifiers = constructor.getModifiers();
|
772 |
|
|
if (Modifier.isPrivate(modifiers))
|
773 |
|
|
continue;
|
774 |
|
|
|
775 |
|
|
data_out.writeUTF("<init>");
|
776 |
|
|
data_out.writeInt(modifiers);
|
777 |
|
|
|
778 |
|
|
// the replacement of '/' with '.' was needed to make computed
|
779 |
|
|
// SUID's agree with those computed by JDK
|
780 |
|
|
data_out.writeUTF
|
781 |
|
|
(TypeSignature.getEncodingOfConstructor(constructor).replace('/','.'));
|
782 |
|
|
}
|
783 |
|
|
|
784 |
|
|
Method method;
|
785 |
|
|
Method[] methods = cl.getDeclaredMethods();
|
786 |
|
|
Arrays.sort(methods, memberComparator);
|
787 |
|
|
for (int i = 0; i < methods.length; i++)
|
788 |
|
|
{
|
789 |
|
|
method = methods[i];
|
790 |
|
|
modifiers = method.getModifiers();
|
791 |
|
|
if (Modifier.isPrivate(modifiers))
|
792 |
|
|
continue;
|
793 |
|
|
|
794 |
|
|
data_out.writeUTF(method.getName());
|
795 |
|
|
data_out.writeInt(modifiers);
|
796 |
|
|
|
797 |
|
|
// the replacement of '/' with '.' was needed to make computed
|
798 |
|
|
// SUID's agree with those computed by JDK
|
799 |
|
|
data_out.writeUTF
|
800 |
|
|
(TypeSignature.getEncodingOfMethod(method).replace('/', '.'));
|
801 |
|
|
}
|
802 |
|
|
|
803 |
|
|
data_out.close();
|
804 |
|
|
byte[] sha = md.digest();
|
805 |
|
|
long result = 0;
|
806 |
|
|
int len = sha.length < 8 ? sha.length : 8;
|
807 |
|
|
for (int i = 0; i < len; i++)
|
808 |
|
|
result += (long) (sha[i] & 0xFF) << (8 * i);
|
809 |
|
|
|
810 |
|
|
return result;
|
811 |
|
|
}
|
812 |
|
|
catch (NoSuchAlgorithmException e)
|
813 |
|
|
{
|
814 |
|
|
throw new RuntimeException
|
815 |
|
|
("The SHA algorithm was not found to use in computing the Serial Version UID for class "
|
816 |
|
|
+ cl.getName(), e);
|
817 |
|
|
}
|
818 |
|
|
catch (IOException ioe)
|
819 |
|
|
{
|
820 |
|
|
throw new RuntimeException(ioe);
|
821 |
|
|
}
|
822 |
|
|
}
|
823 |
|
|
|
824 |
|
|
/**
|
825 |
|
|
* Returns the value of CLAZZ's private static final field named
|
826 |
|
|
* `serialPersistentFields'. It performs some sanity checks before
|
827 |
|
|
* returning the real array. Besides, the returned array is a clean
|
828 |
|
|
* copy of the original. So it can be modified.
|
829 |
|
|
*
|
830 |
|
|
* @param clazz Class to retrieve 'serialPersistentFields' from.
|
831 |
|
|
* @return The content of 'serialPersistentFields'.
|
832 |
|
|
*/
|
833 |
|
|
private ObjectStreamField[] getSerialPersistentFields(Class clazz)
|
834 |
|
|
throws NoSuchFieldException, IllegalAccessException
|
835 |
|
|
{
|
836 |
|
|
ObjectStreamField[] fieldsArray = null;
|
837 |
|
|
ObjectStreamField[] o;
|
838 |
|
|
|
839 |
|
|
// Use getDeclaredField rather than getField for the same reason
|
840 |
|
|
// as above in getDefinedSUID.
|
841 |
|
|
Field f = clazz.getDeclaredField("serialPersistentFields");
|
842 |
|
|
f.setAccessible(true);
|
843 |
|
|
|
844 |
|
|
int modifiers = f.getModifiers();
|
845 |
|
|
if (!(Modifier.isStatic(modifiers) &&
|
846 |
|
|
Modifier.isFinal(modifiers) &&
|
847 |
|
|
Modifier.isPrivate(modifiers)))
|
848 |
|
|
return null;
|
849 |
|
|
|
850 |
|
|
o = (ObjectStreamField[]) f.get(null);
|
851 |
|
|
|
852 |
|
|
if (o == null)
|
853 |
|
|
return null;
|
854 |
|
|
|
855 |
|
|
fieldsArray = new ObjectStreamField[ o.length ];
|
856 |
|
|
System.arraycopy(o, 0, fieldsArray, 0, o.length);
|
857 |
|
|
|
858 |
|
|
return fieldsArray;
|
859 |
|
|
}
|
860 |
|
|
|
861 |
|
|
/**
|
862 |
|
|
* Returns a new instance of the Class this ObjectStreamClass corresponds
|
863 |
|
|
* to.
|
864 |
|
|
* Note that this should only be used for Externalizable classes.
|
865 |
|
|
*
|
866 |
|
|
* @return A new instance.
|
867 |
|
|
*/
|
868 |
|
|
Externalizable newInstance() throws InvalidClassException
|
869 |
|
|
{
|
870 |
|
|
synchronized(this)
|
871 |
|
|
{
|
872 |
|
|
if (constructor == null)
|
873 |
|
|
{
|
874 |
|
|
try
|
875 |
|
|
{
|
876 |
|
|
final Constructor c = clazz.getConstructor(new Class[0]);
|
877 |
|
|
|
878 |
|
|
AccessController.doPrivileged(new PrivilegedAction()
|
879 |
|
|
{
|
880 |
|
|
public Object run()
|
881 |
|
|
{
|
882 |
|
|
c.setAccessible(true);
|
883 |
|
|
return null;
|
884 |
|
|
}
|
885 |
|
|
});
|
886 |
|
|
|
887 |
|
|
constructor = c;
|
888 |
|
|
}
|
889 |
|
|
catch(NoSuchMethodException x)
|
890 |
|
|
{
|
891 |
|
|
throw new InvalidClassException(clazz.getName(),
|
892 |
|
|
"No public zero-argument constructor");
|
893 |
|
|
}
|
894 |
|
|
}
|
895 |
|
|
}
|
896 |
|
|
|
897 |
|
|
try
|
898 |
|
|
{
|
899 |
|
|
return (Externalizable)constructor.newInstance(null);
|
900 |
|
|
}
|
901 |
|
|
catch(Exception x)
|
902 |
|
|
{
|
903 |
|
|
throw (InvalidClassException)
|
904 |
|
|
new InvalidClassException(clazz.getName(),
|
905 |
|
|
"Unable to instantiate").initCause(x);
|
906 |
|
|
}
|
907 |
|
|
}
|
908 |
|
|
|
909 |
|
|
public static final ObjectStreamField[] NO_FIELDS = {};
|
910 |
|
|
|
911 |
|
|
private static Hashtable classLookupTable = new Hashtable();
|
912 |
|
|
private static final NullOutputStream nullOutputStream = new NullOutputStream();
|
913 |
|
|
private static final Comparator interfaceComparator = new InterfaceComparator();
|
914 |
|
|
private static final Comparator memberComparator = new MemberComparator();
|
915 |
|
|
private static final
|
916 |
|
|
Class[] writeMethodArgTypes = { java.io.ObjectOutputStream.class };
|
917 |
|
|
|
918 |
|
|
private ObjectStreamClass superClass;
|
919 |
|
|
private Class clazz;
|
920 |
|
|
private String name;
|
921 |
|
|
private long uid;
|
922 |
|
|
private byte flags;
|
923 |
|
|
|
924 |
|
|
// this field is package protected so that ObjectInputStream and
|
925 |
|
|
// ObjectOutputStream can access it directly
|
926 |
|
|
ObjectStreamField[] fields;
|
927 |
|
|
|
928 |
|
|
// these are accessed by ObjectIn/OutputStream
|
929 |
|
|
int primFieldSize = -1; // -1 if not yet calculated
|
930 |
|
|
int objectFieldCount;
|
931 |
|
|
|
932 |
|
|
Method readObjectMethod;
|
933 |
|
|
Method readResolveMethod;
|
934 |
|
|
Method writeReplaceMethod;
|
935 |
|
|
Method writeObjectMethod;
|
936 |
|
|
boolean realClassIsSerializable;
|
937 |
|
|
boolean realClassIsExternalizable;
|
938 |
|
|
ObjectStreamField[] fieldMapping;
|
939 |
|
|
Constructor firstNonSerializableParentConstructor;
|
940 |
|
|
private Constructor constructor; // default constructor for Externalizable
|
941 |
|
|
|
942 |
|
|
boolean isProxyClass = false;
|
943 |
|
|
|
944 |
|
|
// This is probably not necessary because this class is special cased already
|
945 |
|
|
// but it will avoid showing up as a discrepancy when comparing SUIDs.
|
946 |
|
|
private static final long serialVersionUID = -6120832682080437368L;
|
947 |
|
|
|
948 |
|
|
|
949 |
|
|
// interfaces are compared only by name
|
950 |
|
|
private static final class InterfaceComparator implements Comparator
|
951 |
|
|
{
|
952 |
|
|
public int compare(Object o1, Object o2)
|
953 |
|
|
{
|
954 |
|
|
return ((Class) o1).getName().compareTo(((Class) o2).getName());
|
955 |
|
|
}
|
956 |
|
|
}
|
957 |
|
|
|
958 |
|
|
|
959 |
|
|
// Members (Methods and Constructors) are compared first by name,
|
960 |
|
|
// conflicts are resolved by comparing type signatures
|
961 |
|
|
private static final class MemberComparator implements Comparator
|
962 |
|
|
{
|
963 |
|
|
public int compare(Object o1, Object o2)
|
964 |
|
|
{
|
965 |
|
|
Member m1 = (Member) o1;
|
966 |
|
|
Member m2 = (Member) o2;
|
967 |
|
|
|
968 |
|
|
int comp = m1.getName().compareTo(m2.getName());
|
969 |
|
|
|
970 |
|
|
if (comp == 0)
|
971 |
|
|
return TypeSignature.getEncodingOfMember(m1).
|
972 |
|
|
compareTo(TypeSignature.getEncodingOfMember(m2));
|
973 |
|
|
else
|
974 |
|
|
return comp;
|
975 |
|
|
}
|
976 |
|
|
}
|
977 |
|
|
}
|