oldjidlobjectkeytemplate.java

java1.6众多例子参考

/*
 * @(#)OldJIDLObjectKeyTemplate.java	1.14 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package com.sun.corba.se.impl.ior;

import org.omg.CORBA.OctetSeqHolder ;

import org.omg.CORBA_2_3.portable.InputStream ;
import org.omg.CORBA_2_3.portable.OutputStream ;

import com.sun.corba.se.spi.ior.ObjectId ;
import com.sun.corba.se.spi.ior.ObjectKeyFactory ;

import com.sun.corba.se.spi.orb.ORB ;
import com.sun.corba.se.spi.orb.ORBVersion ;
import com.sun.corba.se.spi.orb.ORBVersionFactory ;

import com.sun.corba.se.impl.ior.ObjectKeyFactoryImpl ;

import com.sun.corba.se.impl.encoding.CDRInputStream ;

/**
 * Handles object keys created by JDK ORBs from before JDK 1.4.0. 
 */
public final class OldJIDLObjectKeyTemplate extends OldObjectKeyTemplateBase
{
    /**
     * JDK 1.3.1 FCS did not include a version byte at the end of
     * its object keys.  JDK 1.3.1_01 included the byte with the
     * value 1.  Anything below 1 is considered an invalid value.
     */
    public static final byte NULL_PATCH_VERSION = 0;

    byte patchVersion = OldJIDLObjectKeyTemplate.NULL_PATCH_VERSION;

    public OldJIDLObjectKeyTemplate( ORB orb, int magic, int scid, 
	InputStream is, OctetSeqHolder osh ) 
    {
	this( orb, magic, scid, is );

	osh.value = readObjectKey( is ) ;
        
        /**
         * Beginning with JDK 1.3.1_01, a byte was placed at the end of
         * the object key with a value indicating the patch version.
         * JDK 1.3.1_01 had the value 1.  If other patches are necessary
         * which involve ORB versioning changes, they should increment
         * the patch version.
         *
         * Note that if we see a value greater than 1 in this code, we
         * will treat it as if we're talking to the most recent ORB version.
         *
         * WARNING: This code is sensitive to changes in CDRInputStream
         * getPosition.  It assumes that the CDRInputStream is an
         * encapsulation whose position can be compared to the object
         * key array length.
         */
        if (magic == ObjectKeyFactoryImpl.JAVAMAGIC_NEW &&
            osh.value.length > ((CDRInputStream)is).getPosition()) {

            patchVersion = is.read_octet();

            if (patchVersion == ObjectKeyFactoryImpl.JDK1_3_1_01_PATCH_LEVEL)
                setORBVersion(ORBVersionFactory.getJDK1_3_1_01());
            else if (patchVersion > ObjectKeyFactoryImpl.JDK1_3_1_01_PATCH_LEVEL)
                setORBVersion(ORBVersionFactory.getORBVersion());
            else
		throw wrapper.invalidJdk131PatchLevel( new Integer( patchVersion ) ) ;
        }
    }
    
    
    public OldJIDLObjectKeyTemplate( ORB orb, int magic, int scid, int serverid) 
    {
	super( orb, magic, scid, serverid, JIDL_ORB_ID, JIDL_OAID ) ; 
    }
   
    public OldJIDLObjectKeyTemplate(ORB orb, int magic, int scid, InputStream is) 
    {
	this( orb, magic, scid, is.read_long() ) ; 
    }
   
    protected void writeTemplate( OutputStream os )
    {
	os.write_long( getMagic() ) ;
	os.write_long( getSubcontractId() ) ;
	os.write_long( getServerId() ) ;
    }

    public void write(ObjectId objectId, OutputStream os) 
    {
        super.write(objectId, os);

        if (patchVersion != OldJIDLObjectKeyTemplate.NULL_PATCH_VERSION)
           os.write_octet( patchVersion ) ;        
    }
}