old-autovect-branch/libjava/classpath/gnu/javax/rmi/CORBA/ValueHandlerDelegateImpl.java

   1 /* ValueHandlerDelegateImpl.java --
   2    Copyright (C) 2005 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package gnu.javax.rmi.CORBA;
  40
  41 import gnu.CORBA.CDR.gnuRuntime;
  42
  43 import org.omg.CORBA.BAD_PARAM;
  44 import org.omg.CORBA.CustomMarshal;
  45 import org.omg.CORBA.portable.OutputStream;
  46 import org.omg.CORBA.portable.Streamable;
  47 import org.omg.SendingContext.RunTime;
  48
  49 import java.io.Externalizable;
  50 import java.io.ObjectStreamClass;
  51 import java.io.Serializable;
  52 import java.rmi.Remote;
  53
  54 import javax.rmi.CORBA.ValueHandler;
  55 import javax.rmi.CORBA.ValueHandlerMultiFormat;
  56
  57 /**
  58  * Implementation of the ValueHandler.
  59  *
  60  * @author Audrius Meskauskas (AudriusA@Bioinformatics.org) (implementation)
  61  */
  62 public class ValueHandlerDelegateImpl
  63   extends RmiUtilities
  64   implements ValueHandler, ValueHandlerMultiFormat
  65 {
  66   /**
  67    * Return the maximal supported stream format version. We currently
  68    * support the version 1.
  69    *
  70    * TODO Support the version 2.
  71    */
  72   public byte getMaximumStreamFormatVersion()
  73   {
  74     return 1;
  75   }
  76
  77   /**
  78    * Write value using the given stream format version.
  79    */
  80   public void writeValue(OutputStream output, Serializable value, byte version)
  81   {
  82     if (version!=1)
  83       throw new BAD_PARAM("Unsupported stream format version "+version);
  84     else
  85       writeValue(output, value);
  86   }
  87
  88   /**
  89    * This implementation associates RunTime with stream rather than with the
  90    * value handler and this method is not used in the implementation. It is
  91    * implemented just for the sake of compatibility.
  92    */
  93   public RunTime getRunTimeCodeBase()
  94   {
  95     return new gnuRuntime(null, null);
  96   }
  97
  98   /**
  99    * Checks if an instance of this class can write its fields itself.
 100    */
 101   public boolean isCustomMarshaled(Class clz)
 102   {
 103     return CustomMarshal.class.isAssignableFrom(clz)
 104       || Streamable.class.isAssignableFrom(clz);
 105   }
 106
 107   /**
 108    * No replacement, returns the passed parameter.
 109    */
 110   public Serializable writeReplace(Serializable value)
 111   {
 112     return value;
 113   }
 114
 115   /**
 116    * Compute the repository id in the RMI hashed format.
 117    */
 118   public String getRMIRepositoryID(final Class cx)
 119   {
 120     long hash = 0;
 121     Class of = cx.isArray() ? cx.getComponentType() : null;
 122
 123     if (cx.equals(String[].class))
 124       return RMI_STRING_ARRAY_ID;
 125     else if (cx.equals(String.class))
 126       return RMI_STRING_ID;
 127     else if (cx.equals(Class.class))
 128       return RMI_CLASS_ID;
 129     else if (Remote.class.isAssignableFrom(cx)
 130       || !Serializable.class.isAssignableFrom(cx)
 131       || cx.isInterface()
 132       || (cx.isArray() && (!Serializable.class.isAssignableFrom(of)
 133         || of.isPrimitive() || Remote.class.isAssignableFrom(of)))
 134
 135     )
 136       // Some classes that have zero hash code and serial no version id
 137       // included.
 138       return "RMI:" + cx.getName() + ":" + toHex(hash);
 139     else if (cx.isArray())
 140       // Arrays have the same hashcode and uid as they components.
 141       return "RMI:" + cx.getName() + ":" + toHex(getHashCode(of)) + ":"
 142         + toHex(getSid(of));
 143     else
 144       {
 145         if (Externalizable.class.isAssignableFrom(cx))
 146           hash = 1;
 147         else
 148           hash = getHashCode(cx);
 149
 150         return "RMI:" + cx.getName() + ":" + toHex(hash) + ":"
 151           + toHex(getSid(cx));
 152       }
 153   }
 154
 155   /**
 156    * Get the class serial version UID.
 157    */
 158   long getSid(Class cx)
 159   {
 160     ObjectStreamClass osc = ObjectStreamClass.lookup(cx);
 161     return osc.getSerialVersionUID();
 162   }
 163 }