/*
 * @(#)POACurrent.java	1.17 03/12/19
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package com.sun.corba.se.impl.oa.poa;

import java.util.*;
import org.omg.CORBA.CompletionStatus;
import org.omg.PortableServer.CurrentPackage.NoContext;
import org.omg.PortableServer.POA;
import org.omg.PortableServer.Servant;
import org.omg.PortableServer.ServantLocatorPackage.CookieHolder;

import com.sun.corba.se.spi.oa.OAInvocationInfo ;
import com.sun.corba.se.spi.oa.ObjectAdapter ;

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

import com.sun.corba.se.spi.logging.CORBALogDomains ;

import com.sun.corba.se.impl.logging.POASystemException ;

// XXX Needs to be turned into LocalObjectImpl.

public class POACurrent extends org.omg.CORBA.portable.ObjectImpl
    implements org.omg.PortableServer.Current 
{
    private ORB orb;
    private POASystemException wrapper ;

    public POACurrent(ORB orb)
    {
	this.orb = orb;
	wrapper = POASystemException.get( orb,
	    CORBALogDomains.OA_INVOCATION ) ;
    }

    public String[] _ids()
    {
        String[] ids = new String[1];
        ids[0] = "IDL:omg.org/PortableServer/Current:1.0";
        return ids;
    }

    //
    // Standard OMG operations.
    //

    public POA get_POA()
        throws 
	    NoContext
    {
        POA poa = (POA)(peekThrowNoContext().oa());
	throwNoContextIfNull(poa);
	return poa;
    }

    public byte[] get_object_id()
        throws 
	    NoContext
    {
	byte[] objectid = peekThrowNoContext().id();
	throwNoContextIfNull(objectid);
	return objectid;
    }

    //
    // Implementation operations used by POA package.
    //

    public ObjectAdapter getOA()
    {
        ObjectAdapter oa = peekThrowInternal().oa();
	throwInternalIfNull(oa);
	return oa;
    }

    public byte[] getObjectId()
    {
	byte[] objectid = peekThrowInternal().id();
	throwInternalIfNull(objectid);
	return objectid;
    }

    Servant getServant()
    {
	Servant servant = (Servant)(peekThrowInternal().getServantContainer());
	// If is OK for the servant to be null.
	// This could happen if POAImpl.getServant is called but
	// POAImpl.internalGetServant throws an exception.
	return servant;
    }

    CookieHolder getCookieHolder()
    {
	CookieHolder cookieHolder = peekThrowInternal().getCookieHolder();
	throwInternalIfNull(cookieHolder);
	return cookieHolder;
    }

    // This is public so we can test the stack balance.
    // It is not a security hole since this same info can be obtained from 
    // PortableInterceptors.
    public String getOperation()
    {
	String operation = peekThrowInternal().getOperation();
	throwInternalIfNull(operation);
	return operation;
    }

    void setServant(Servant servant)
    {
	peekThrowInternal().setServant( servant );
    }

    //
    // Class utilities.
    //

    private OAInvocationInfo peekThrowNoContext()
	throws
	    NoContext
    {
	OAInvocationInfo invocationInfo = null;
	try {
	    invocationInfo = orb.peekInvocationInfo() ;
	} catch (EmptyStackException e) {
	    throw new NoContext();
	}
	return invocationInfo;
    }

    private OAInvocationInfo peekThrowInternal()
    {
	OAInvocationInfo invocationInfo = null;
	try {
	    invocationInfo = orb.peekInvocationInfo() ;
	} catch (EmptyStackException e) {
	    // The completion status is maybe because this could happen
	    // after the servant has been invoked.
	    throw wrapper.poacurrentUnbalancedStack( e ) ;
	}
	return invocationInfo;
    }

    private void throwNoContextIfNull(Object o)
	throws
	    NoContext
    {
	if ( o == null ) {
	    throw new NoContext();
	}
    }

    private void throwInternalIfNull(Object o)
    {
	if ( o == null ) {
	    throw wrapper.poacurrentNullField( CompletionStatus.COMPLETED_MAYBE ) ;
	}
    }
}
