/*
 * @(#)StubIORImpl.java	1.3 04/07/27
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Licensed Materials - Property of IBM
 * RMI-IIOP v1.0
 * Copyright IBM Corp. 1998 1999  All Rights Reserved
 *
 * US Government Users Restricted Rights - Use, duplication or
 * disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */

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

import java.io.ObjectInputStream ;
import java.io.ObjectOutputStream ;
import java.io.IOException ;
import java.io.StringWriter ;

import org.omg.CORBA.ORB ;

import org.omg.CORBA.portable.Delegate ;
import org.omg.CORBA.portable.InputStream ;
import org.omg.CORBA.portable.OutputStream ;

// Be very careful: com.sun.corba imports must not depend on 
// PEORB internal classes in ways that prevent portability to
// other vendor's ORBs.
import com.sun.corba.se.spi.presentation.rmi.StubAdapter ;
import com.sun.corba.se.impl.orbutil.HexOutputStream ;

/**
 * This class implements a very simply IOR representation
 * which must be completely ORBImpl free so that this class
 * can be used in the implementation of a portable StubDelegateImpl.
 */
public class StubIORImpl
{
    // cached hash code
    private int hashCode;
    
    // IOR components
    private byte[] typeData;
    private int[] profileTags;
    private byte[][] profileData;

    public StubIORImpl() 
    {
	hashCode = 0 ;
	typeData = null ;
	profileTags = null ;
	profileData = null ;
    }

    public String getRepositoryId()
    {
	if (typeData == null)
	    return null ;

	return new String( typeData ) ;
    }

    public StubIORImpl( org.omg.CORBA.Object obj )
    {
	// write the IOR to an OutputStream and get an InputStream 
	OutputStream ostr = StubAdapter.getORB( obj ).create_output_stream();
	ostr.write_Object(obj);
	InputStream istr = ostr.create_input_stream();

	// read the IOR components back from the stream
	int typeLength = istr.read_long();
	typeData = new byte[typeLength];
	istr.read_octet_array(typeData, 0, typeLength);
	int numProfiles = istr.read_long();
	profileTags = new int[numProfiles];
	profileData = new byte[numProfiles][];
	for (int i = 0; i < numProfiles; i++) {
	    profileTags[i] = istr.read_long();
	    profileData[i] = new byte[istr.read_long()];
	    istr.read_octet_array(profileData[i], 0, profileData[i].length);
	}
    }
   
    public Delegate getDelegate( ORB orb )
    {
	// write the IOR components to an org.omg.CORBA.portable.OutputStream 
	OutputStream ostr = orb.create_output_stream();
	ostr.write_long(typeData.length);
	ostr.write_octet_array(typeData, 0, typeData.length);
	ostr.write_long(profileTags.length);
	for (int i = 0; i < profileTags.length; i++) {
	    ostr.write_long(profileTags[i]);
	    ostr.write_long(profileData[i].length);
	    ostr.write_octet_array(profileData[i], 0, profileData[i].length);
	}

	InputStream istr = ostr.create_input_stream() ;

	// read the IOR back from the stream
	org.omg.CORBA.Object obj = (org.omg.CORBA.Object)istr.read_Object();
	return StubAdapter.getDelegate( obj ) ;
    }

    public  void doRead( java.io.ObjectInputStream stream ) 
        throws IOException, ClassNotFoundException 
    {
	// read the IOR from the ObjectInputStream
	int typeLength = stream.readInt();
	typeData = new byte[typeLength];
	stream.readFully(typeData);
	int numProfiles = stream.readInt();
	profileTags = new int[numProfiles];
	profileData = new byte[numProfiles][];
	for (int i = 0; i < numProfiles; i++) {
	    profileTags[i] = stream.readInt();
	    profileData[i] = new byte[stream.readInt()];
	    stream.readFully(profileData[i]);
        }
    }

    public  void doWrite( ObjectOutputStream stream )
        throws IOException 
    {
	// write the IOR to the ObjectOutputStream
	stream.writeInt(typeData.length);
	stream.write(typeData);
	stream.writeInt(profileTags.length);
	for (int i = 0; i < profileTags.length; i++) {
	    stream.writeInt(profileTags[i]);
	    stream.writeInt(profileData[i].length);
	    stream.write(profileData[i]);
        }
    }

    /**
     * Returns a hash code value for the object which is the same for all stubs
     * that represent the same remote object.
     * @return the hash code value.
     */
    public synchronized int hashCode() 
    {
	if (hashCode == 0) {

	    // compute the hash code
	    for (int i = 0; i < typeData.length; i++) {
		hashCode = hashCode * 37 + typeData[i];
	    }

	    for (int i = 0; i < profileTags.length; i++) {
	 	hashCode = hashCode * 37 + profileTags[i];
		for (int j = 0; j < profileData[i].length; j++) {
		    hashCode = hashCode * 37 + profileData[i][j];
		}
            }
	}

        return hashCode;    
    }

    private boolean equalArrays( int[] data1, int[] data2 ) 
    {
	if (data1.length != data2.length)
	    return false ;

	for (int ctr=0; ctr<data1.length; ctr++) {
	    if (data1[ctr] != data2[ctr])
		return false ;
	}

	return true ;
    }

    private boolean equalArrays( byte[] data1, byte[] data2 ) 
    {
	if (data1.length != data2.length)
	    return false ;

	for (int ctr=0; ctr<data1.length; ctr++) {
	    if (data1[ctr] != data2[ctr])
		return false ;
	}

	return true ;
    }

    private boolean equalArrays( byte[][] data1, byte[][] data2 ) 
    {
	if (data1.length != data2.length)
	    return false ;

	for (int ctr=0; ctr<data1.length; ctr++) {
	    if (!equalArrays( data1[ctr], data2[ctr] )) 
		return false ;
	}

	return true ;
    }

    public boolean equals(java.lang.Object obj) 
    {
        if (this == obj) {
            return true;    
        }
        
        if (!(obj instanceof StubIORImpl)) {
            return false;            
        }
        
        StubIORImpl other = (StubIORImpl) obj;
        if (other.hashCode() != this.hashCode()) {
            return false;
        }

	return equalArrays( typeData, other.typeData ) &&
	    equalArrays( profileTags, other.profileTags ) &&
	    equalArrays( profileData, other.profileData ) ;
    }

    private void appendByteArray( StringBuffer result, byte[] data )
    {
	for ( int ctr=0; ctr<data.length; ctr++ ) {
	    result.append( Integer.toHexString( data[ctr] ) ) ;
	}
    }

    /**
     * Returns a string representation of this stub. Returns the same string
     * for all stubs that represent the same remote object.
     * "SimpleIORImpl[<typeName>,[<profileID>]data, ...]"
     * @return a string representation of this stub.
     */
    public String toString() 
    {
	StringBuffer result = new StringBuffer() ;
	result.append( "SimpleIORImpl[" ) ;
	String repositoryId = new String( typeData ) ;
	result.append( repositoryId ) ;
	for (int ctr=0; ctr<profileTags.length; ctr++) {
	    result.append( ",(" ) ;
	    result.append( profileTags[ctr] ) ;
	    result.append( ")" ) ;
	    appendByteArray( result,  profileData[ctr] ) ;
	}

	result.append( "]" ) ;
	return result.toString() ;
    }
}