| /* RemoteObject.java -- |
| Copyright (c) 1996, 1997, 1998, 1999, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package java.rmi.server; |
| |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutput; |
| import java.io.ObjectOutputStream; |
| import java.io.Serializable; |
| import java.rmi.NoSuchObjectException; |
| import java.rmi.Remote; |
| import java.rmi.UnmarshalException; |
| import java.util.WeakHashMap; |
| |
| public abstract class RemoteObject |
| implements Remote, Serializable { |
| |
| private static final long serialVersionUID = -3215090123894869218l; |
| |
| protected transient RemoteRef ref; |
| |
| private static final WeakHashMap stubs = new WeakHashMap(); |
| |
| protected RemoteObject() { |
| this(null); |
| } |
| |
| protected RemoteObject(RemoteRef newref) { |
| ref = newref; |
| } |
| |
| public RemoteRef getRef() { |
| return (ref); |
| } |
| |
| synchronized static void addStub(Remote obj, Remote stub) |
| { |
| stubs.put(obj, stub); |
| } |
| |
| synchronized static void deleteStub(Remote obj) |
| { |
| stubs.remove(obj); |
| } |
| |
| public static Remote toStub(Remote obj) throws NoSuchObjectException |
| { |
| Remote stub = (Remote)stubs.get(obj); |
| |
| if (stub == null) |
| throw new NoSuchObjectException(obj.getClass().getName()); |
| |
| return stub; |
| } |
| |
| public int hashCode() { |
| if (ref == null) { |
| return (0); |
| } |
| else { |
| return (ref.hashCode()); |
| } |
| } |
| |
| public boolean equals(Object obj) { |
| // We only compare references. |
| return (this == obj); |
| } |
| |
| /** |
| * Get the string representation of this remote object. |
| */ |
| public String toString() |
| { |
| if (ref == null) |
| return getClass ().toString (); |
| return (ref.toString ()); |
| } |
| |
| /** |
| * Read the remote object from the input stream. Expects the class name |
| * without package first. Then the method creates and assigns the {@link #ref} |
| * an instance of this class and calls its .readExternal method. The standard |
| * packageless class names are UnicastRef, UnicastRef2, UnicastServerRef, |
| * UnicastServerRef2, ActivatableRef or ActivatableServerRef. |
| * |
| * @param in the stream to read from |
| * @throws IOException if the IO exception occurs |
| * @throws ClassNotFoundException if the class with the given name is not |
| * present in the package gnu.java.rmi.server (for the case of the |
| * GNU Classpath. |
| */ |
| private void readObject(ObjectInputStream in) throws IOException, |
| ClassNotFoundException |
| { |
| String cname = in.readUTF(); |
| if (! cname.equals("")) |
| { |
| if (cname.equals("UnicastRef2")) |
| { |
| // hack for interoperating with JDK |
| cname = "UnicastRef"; |
| in.read(); // some unknown UnicastRef2 field |
| } |
| |
| // It would be nice to use RemoteRef.packagePrefix here, but for binary |
| // compatibility with the JDK that has to contain "sun.rmi.server"... |
| cname = "gnu.java.rmi.server." + cname; |
| try |
| { |
| Class cls = Class.forName(cname); |
| ref = (RemoteRef) cls.newInstance(); |
| } |
| catch (InstantiationException e1) |
| { |
| throw new UnmarshalException("failed to create ref", e1); |
| } |
| catch (IllegalAccessException e2) |
| { |
| throw new UnmarshalException("failed to create ref", e2); |
| } |
| ref.readExternal(in); |
| } |
| else |
| { |
| ref = (RemoteRef) in.readObject(); |
| } |
| } |
| |
| /** |
| * Write the remote object to the output stream. This method first calls |
| * {@link RemoteRef#getRefClass(ObjectOutput)} on the {@link #ref} to get the |
| * class name without package, writes this name and then calls the |
| * ref.writeObject to write the data. The standard packageless class names are |
| * UnicastRef, UnicastRef2, UnicastServerRef, UnicastServerRef2, |
| * ActivatableRef or ActivatableServerRef. The empty string with the |
| * subsequently following serialized ref instance be written if the |
| * ref.getRefClass returns null. |
| * |
| * @param out the stream to write to |
| * @throws IOException if one occurs during writing |
| * @throws ClassNotFoundException never in this implementation (specified as |
| * part of the API standard) |
| * @throws UnmarshalException if the remote reference of this remote object is |
| * null. |
| */ |
| private void writeObject(ObjectOutputStream out) throws IOException, |
| ClassNotFoundException |
| { |
| if (ref == null) |
| { |
| throw new UnmarshalException("no ref to serialize"); |
| } |
| String cname = ref.getRefClass(out); |
| if (cname != null && cname.length() > 0) |
| { |
| out.writeUTF(cname); |
| ref.writeExternal(out); |
| } |
| else |
| { |
| out.writeUTF(""); |
| out.writeObject(ref); |
| } |
| } |
| |
| } |