| /* MarshalledObject.java -- |
| Copyright (c) 1996, 1997, 1998, 1999, 2004, 2006 |
| 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; |
| |
| import gnu.java.rmi.RMIMarshalledObjectInputStream; |
| import gnu.java.rmi.RMIMarshalledObjectOutputStream; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.Serializable; |
| |
| /** |
| * A <code>MarshalledObject</code> consists of a serialized object which is |
| * marshalled according to the RMI specification. |
| * <p> |
| * An object passed to the constructor is serialized and tagged with the needed |
| * URL to retrieve its class definition for remote usage. If the object is a |
| * remote reference its stub is serialized instead. The instance of this |
| * marshalled object can be later retrieved by its <code>get()</code> method. |
| * </p> |
| * |
| * @author unknown |
| */ |
| public final class MarshalledObject |
| implements Serializable |
| { |
| // The following fields are from Java API Documentation "Serialized form" |
| private static final long serialVersionUID = 8988374069173025854L; |
| |
| byte[] objBytes; |
| byte[] locBytes; |
| int hash; |
| |
| /** |
| * Constructs a <code>MarshalledObject</code> from the given object. |
| * |
| * @param obj the object to marshal |
| * @throws IOException if an I/O error during serialization occurs. |
| */ |
| public MarshalledObject(Object obj) throws IOException |
| { |
| ByteArrayOutputStream objStream = new ByteArrayOutputStream(); |
| RMIMarshalledObjectOutputStream stream = |
| new RMIMarshalledObjectOutputStream(objStream); |
| stream.writeObject(obj); |
| stream.flush(); |
| objBytes = objStream.toByteArray(); |
| locBytes = stream.getLocBytes(); |
| |
| // The following algorithm of calculating hashCode is similar to String |
| hash = 0; |
| for (int i = 0; i < objBytes.length; i++) |
| hash = hash * 31 + objBytes[i]; |
| |
| if (locBytes != null) |
| for (int i = 0; i < locBytes.length; i++) |
| hash = hash * 31 + locBytes[i]; |
| } |
| |
| /** |
| * Checks if the given object is equal to this marshalled object. |
| * |
| * <p>Marshalled objects are considered equal if they contain the |
| * same serialized object. Codebase annotations where the class |
| * definition can be downloaded are ignored in the equals test.</p> |
| * |
| * @param obj the object to compare. |
| * @return <code>true</code> if equal, <code>false</code> otherwise. |
| */ |
| public boolean equals(Object obj) |
| { |
| if (! (obj instanceof MarshalledObject)) |
| return false; |
| |
| // hashCode even differs, don't do the time-consuming comparisons |
| if (obj.hashCode() != hash) |
| return false; |
| |
| MarshalledObject aobj = (MarshalledObject) obj; |
| if (objBytes == null || aobj.objBytes == null) |
| return objBytes == aobj.objBytes; |
| if (objBytes.length != aobj.objBytes.length) |
| return false; |
| for (int i = 0; i < objBytes.length; i++) |
| { |
| if (objBytes[i] != aobj.objBytes[i]) |
| return false; |
| } |
| // Ignore comparison of locBytes(annotation) |
| return true; |
| } |
| |
| /** |
| * Constructs and returns a copy of the internal serialized object. |
| * |
| * @return The deserialized object. |
| * |
| * @throws IOException if an I/O exception occurs during deserialization. |
| * @throws ClassNotFoundException if the class of the deserialized object |
| * cannot be found. |
| */ |
| public Object get() throws IOException, ClassNotFoundException |
| { |
| if (objBytes == null) |
| return null; |
| |
| RMIMarshalledObjectInputStream stream = |
| new RMIMarshalledObjectInputStream(objBytes, locBytes); |
| return stream.readObject(); |
| } |
| |
| public int hashCode() |
| { |
| return hash; |
| } |
| |
| } |