114 lines
3.8 KiB
Java
114 lines
3.8 KiB
Java
/* MarshalledObject.java --
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Copyright (c) 1996, 1997, 1998, 1999, 2004 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.rmi;
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import gnu.java.rmi.RMIMarshalledObjectInputStream;
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import gnu.java.rmi.RMIMarshalledObjectOutputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.Serializable;
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/**
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* FIXME - doc missing
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*/
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public final class MarshalledObject implements Serializable
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{
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//The following fields are from Java API Documentation "Serialized form"
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private static final long serialVersionUID = 8988374069173025854L;
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byte[] objBytes;
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byte[] locBytes;
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int hash;
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public MarshalledObject(Object obj) throws java.io.IOException
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{
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ByteArrayOutputStream objStream = new ByteArrayOutputStream();
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RMIMarshalledObjectOutputStream stream = new RMIMarshalledObjectOutputStream(objStream);
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stream.writeObject(obj);
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stream.flush();
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objBytes = objStream.toByteArray();
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locBytes = stream.getLocBytes();
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//The following algorithm of calculating hashCode is similar to String
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hash = 0;
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for (int i = 0; i < objBytes.length; i++)
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hash = hash * 31 + objBytes[i];
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if(locBytes != null)
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for (int i = 0; i < locBytes.length; i++)
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hash = hash * 31 + locBytes[i];
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}
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public boolean equals(Object obj)
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{
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if (! (obj instanceof MarshalledObject))
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return false;
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// hashCode even differs, don't do the time-consuming comparisons
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if (obj.hashCode() != hash)
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return false;
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MarshalledObject aobj = (MarshalledObject)obj;
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if (objBytes == null || aobj.objBytes == null)
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return objBytes == aobj.objBytes;
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if (objBytes.length != aobj.objBytes.length)
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return false;
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for (int i = 0; i < objBytes.length; i++)
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{
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if (objBytes[i] != aobj.objBytes[i])
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return false;
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}
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// Ignore comparison of locBytes(annotation)
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return true;
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}
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public Object get()
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throws java.io.IOException, java.lang.ClassNotFoundException
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{
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if(objBytes == null)
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return null;
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RMIMarshalledObjectInputStream stream =
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new RMIMarshalledObjectInputStream(objBytes, locBytes);
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return stream.readObject();
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}
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public int hashCode() {
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return hash;
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}
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}
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