diff options
author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
---|---|---|
committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/rmi/MarshalledObject.java | |
download | cbb-gcc-4.6.4-upstream.tar.bz2 cbb-gcc-4.6.4-upstream.tar.xz |
obtained gcc-4.6.4.tar.bz2 from upstream website;upstream
verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.
downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.
if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.
Diffstat (limited to 'libjava/classpath/java/rmi/MarshalledObject.java')
-rw-r--r-- | libjava/classpath/java/rmi/MarshalledObject.java | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/libjava/classpath/java/rmi/MarshalledObject.java b/libjava/classpath/java/rmi/MarshalledObject.java new file mode 100644 index 000000000..a48e4c009 --- /dev/null +++ b/libjava/classpath/java/rmi/MarshalledObject.java @@ -0,0 +1,154 @@ +/* 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; + } + +} |