SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the Mozilla Public License Version 2.0.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package cc.squirreljme.jdwp.host;

import cc.squirreljme.jdwp.JDWPCommand;
import cc.squirreljme.jdwp.JDWPCommandSetClassObjectReference;
import cc.squirreljme.jdwp.JDWPErrorType;
import cc.squirreljme.jdwp.JDWPException;
import cc.squirreljme.jdwp.JDWPPacket;
import cc.squirreljme.jdwp.host.views.JDWPViewObject;
import cc.squirreljme.jdwp.host.views.JDWPViewType;

/**
 * Handles class object references.
 *
 * @since 2021/04/30
 */
public enum JDWPHostCommandSetClassObjectReference
    implements JDWPCommandHandler
{
    /** The actual type of the class object. */
    REFLECTED_TYPE(JDWPCommandSetClassObjectReference.REFLECTED_TYPE)
    {
        /**
         * {@inheritDoc}
         * @since 2021/04/30
         */
        @Override
        public JDWPPacket execute(JDWPHostController __controller,
            JDWPPacket __packet)
            throws JDWPException
        {
            Object object = __controller.readObject(__packet, false);
            
            // This must be Class<?>...
            JDWPViewType viewType = __controller.viewType();
            JDWPViewObject viewObject = __controller.viewObject();
            if (viewObject == null || !viewObject.isValid(viewObject))
            {
                Object objectType = __controller.viewObject().type(object);
                
                // Ensure this is correct
                if (objectType == null || !viewType.isValid(objectType) ||
                    !"Ljava/lang/Class;"
                        .equals(viewType.signature(objectType)))
                    throw JDWPErrorType.INVALID_OBJECT.toss(object,
                        System.identityHashCode(object),
                        new Throwable("Not a Class object."));
            }
            
            // Ask the viewer to get the type for this Class reference
            Object found = viewType.typeOfClassInstance(object);
            if (found != null && viewType.isValid(found))
                __controller.getState().items.put(found);
            
            // Could not directly get, so search through all types to find
            if (found == null || !viewType.isValid(found))
                for (Object type : __controller.allTypes(false))
                {
                    // Is this a match?
                    Object maybe = viewType.instance(type);
                    if (maybe == object)
                    {
                        found = type;
                        break; 
                    }
                }
            
            // Not found?
            if (found == null || !viewType.isValid(found))
                throw JDWPErrorType.INVALID_OBJECT.toss(object,
                    System.identityHashCode(object),
                    new Throwable("No matching type found."));
                    
            // Make sure it is known
            __controller.getState().items.put(found);
            
            JDWPPacket rv = __controller.reply(
                __packet.id(), JDWPErrorType.NO_ERROR);
            
            // Write the class type and reference to that type
            __controller.writeTaggedId(rv, found);
            
            return rv;
        }
    },
    
    /* End. */
    ;
    
    /** The base command. */
    public final JDWPCommand command;
    
    /** The ID of the packet. */
    public final int id;
    
    /**
     * Returns the ID used.
     * 
     * @param __id The ID used.
     * @since 2021/04/30
     */
    JDWPHostCommandSetClassObjectReference(JDWPCommand __id)
    {
        this.command = __id;
        this.id = __id.debuggerId();
    }
    
    /**
     * {@inheritDoc}
     * @since 2024/01/23
     */
    @Override
    public final JDWPCommand command()
    {
        return this.command;
    }
    
    /**
     * {@inheritDoc}
     * @since 2021/04/30
     */
    @Override
    public final int debuggerId()
    {
        return this.id;
    }
}