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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/rmi/MarshalledObject.java
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+/* 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<T>
+ 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(T 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 T get() throws IOException, ClassNotFoundException
+ {
+ if (objBytes == null)
+ return null;
+
+ RMIMarshalledObjectInputStream stream =
+ new RMIMarshalledObjectInputStream(objBytes, locBytes);
+ return (T) stream.readObject();
+ }
+
+ public int hashCode()
+ {
+ return hash;
+ }
+
+}