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jlechner |
/* ValueHandlerDelegateImpl.java --
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Copyright (C) 2005 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 gnu.javax.rmi.CORBA;
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import gnu.CORBA.CDR.gnuRuntime;
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import org.omg.CORBA.BAD_PARAM;
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import org.omg.CORBA.CustomMarshal;
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import org.omg.CORBA.portable.OutputStream;
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import org.omg.CORBA.portable.Streamable;
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import org.omg.SendingContext.RunTime;
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import java.io.Externalizable;
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import java.io.ObjectStreamClass;
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import java.io.Serializable;
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import java.rmi.Remote;
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import javax.rmi.CORBA.ValueHandler;
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import javax.rmi.CORBA.ValueHandlerMultiFormat;
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/**
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* Implementation of the ValueHandler.
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*
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* @author Audrius Meskauskas (AudriusA@Bioinformatics.org) (implementation)
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*/
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public class ValueHandlerDelegateImpl
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extends RmiUtilities
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implements ValueHandler, ValueHandlerMultiFormat
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{
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/**
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* Return the maximal supported stream format version. We currently
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* support the version 1.
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*
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* TODO Support the version 2.
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*/
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public byte getMaximumStreamFormatVersion()
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{
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return 1;
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}
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/**
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* Write value using the given stream format version.
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*/
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public void writeValue(OutputStream output, Serializable value, byte version)
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{
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if (version!=1)
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throw new BAD_PARAM("Unsupported stream format version "+version);
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else
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writeValue(output, value);
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}
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/**
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* This implementation associates RunTime with stream rather than with the
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* value handler and this method is not used in the implementation. It is
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* implemented just for the sake of compatibility.
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*/
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public RunTime getRunTimeCodeBase()
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{
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return new gnuRuntime(null, null);
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}
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/**
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* Checks if an instance of this class can write its fields itself.
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*/
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public boolean isCustomMarshaled(Class clz)
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{
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return CustomMarshal.class.isAssignableFrom(clz)
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|| Streamable.class.isAssignableFrom(clz);
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}
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/**
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* No replacement, returns the passed parameter.
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*/
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public Serializable writeReplace(Serializable value)
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{
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return value;
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}
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/**
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* Compute the repository id in the RMI hashed format.
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*/
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public String getRMIRepositoryID(final Class cx)
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{
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long hash = 0;
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Class of = cx.isArray() ? cx.getComponentType() : null;
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if (cx.equals(String[].class))
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return RMI_STRING_ARRAY_ID;
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else if (cx.equals(String.class))
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return RMI_STRING_ID;
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else if (cx.equals(Class.class))
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return RMI_CLASS_ID;
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else if (Remote.class.isAssignableFrom(cx)
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|| !Serializable.class.isAssignableFrom(cx)
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|| cx.isInterface()
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|| (cx.isArray() && (!Serializable.class.isAssignableFrom(of)
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|| of.isPrimitive() || Remote.class.isAssignableFrom(of)))
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)
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// Some classes that have zero hash code and serial no version id
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// included.
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return "RMI:" + cx.getName() + ":" + toHex(hash);
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else if (cx.isArray())
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// Arrays have the same hashcode and uid as they components.
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return "RMI:" + cx.getName() + ":" + toHex(getHashCode(of)) + ":"
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+ toHex(getSid(of));
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else
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{
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if (Externalizable.class.isAssignableFrom(cx))
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hash = 1;
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else
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hash = getHashCode(cx);
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return "RMI:" + cx.getName() + ":" + toHex(hash) + ":"
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+ toHex(getSid(cx));
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}
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}
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/**
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* Get the class serial version UID.
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*/
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long getSid(Class cx)
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{
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ObjectStreamClass osc = ObjectStreamClass.lookup(cx);
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return osc.getSerialVersionUID();
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}
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}
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