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Java example source code file (EncapsulationUtility.java)

This example Java source code file (EncapsulationUtility.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

corba, encapsinputstream, encapsoutputstream, encapsulationutility, identifiable, identifiablefactoryfinder, inputstream, iterator, list, outputstream, util, writecontents

The EncapsulationUtility.java Java example source code

/*
 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

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

import java.util.List;
import java.util.LinkedList;
import java.util.Iterator;

import org.omg.IOP.TAG_INTERNET_IOP ;

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

import com.sun.corba.se.spi.ior.TaggedComponent ;
import com.sun.corba.se.spi.ior.Identifiable ;
import com.sun.corba.se.spi.ior.IdentifiableFactoryFinder ;
import com.sun.corba.se.spi.ior.WriteContents ;

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

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

import com.sun.corba.se.impl.encoding.CDROutputStream ;
import com.sun.corba.se.impl.encoding.EncapsOutputStream ;
import com.sun.corba.se.impl.encoding.EncapsInputStream ;

import sun.corba.EncapsInputStreamFactory;

/**
 * This static utility class contains various utility methods for reading and
 * writing CDR encapsulations.
 *
 * @author Ken Cavanaugh
 */
public class EncapsulationUtility
{
    private EncapsulationUtility()
    {
    }

    /** Read the count from is, then read count Identifiables from
     * is using the factory.  Add each constructed Identifiable to container.
     */
    public static void readIdentifiableSequence( List container,
        IdentifiableFactoryFinder finder, InputStream istr)
    {
        int count = istr.read_long() ;
        for (int ctr = 0; ctr<count; ctr++) {
            int id = istr.read_long() ;
            Identifiable obj = finder.create( id, istr ) ;
            container.add( obj ) ;
        }
    }

    /** Write all Identifiables that we contain to os.  The total
     * length must be written before this method is called.
     */
    public static  void writeIdentifiableSequence( List container, OutputStream os)
    {
        os.write_long( container.size() ) ;
        Iterator iter = container.iterator() ;
        while (iter.hasNext()) {
            Identifiable obj = (Identifiable)( iter.next() ) ;
            os.write_long( obj.getId() ) ;
            obj.write( os ) ;
        }
    }

    /** Helper method that is used to extract data from an output
    * stream and write the data to another output stream.  Defined
    * as static so that it can be used in another class.
    */
    static public void writeOutputStream( OutputStream dataStream,
        OutputStream os )
    {
        byte[] data = ((CDROutputStream)dataStream).toByteArray() ;
        os.write_long( data.length ) ;
        os.write_octet_array( data, 0, data.length ) ;
    }

    /** Helper method to read the octet array from is, deencapsulate it,
    * and return
    * as another InputStream.  This must be called inside the
    * constructor of a derived class to obtain the correct stream
    * for unmarshalling data.
    */
    static public InputStream getEncapsulationStream( InputStream is )
    {
        byte[] data = readOctets( is ) ;
        EncapsInputStream result = EncapsInputStreamFactory.newEncapsInputStream( is.orb(), data,
                data.length ) ;
        result.consumeEndian() ;
        return result ;
    }

    /** Helper method that reads an octet array from an input stream.
    * Defined as static here so that it can be used in another class.
    */
    static public byte[] readOctets( InputStream is )
    {
        int len = is.read_ulong() ;
        byte[] data = new byte[len] ;
        is.read_octet_array( data, 0, len ) ;
        return data ;
    }

    static public void writeEncapsulation( WriteContents obj,
        OutputStream os )
    {
        EncapsOutputStream out =
            sun.corba.OutputStreamFactory.newEncapsOutputStream((ORB)os.orb());

        out.putEndian() ;

        obj.writeContents( out ) ;

        writeOutputStream( out, os ) ;
    }
}

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