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.JDWPCommandSetThreadGroupReference;
import cc.squirreljme.jdwp.JDWPErrorType;
import cc.squirreljme.jdwp.JDWPException;
import cc.squirreljme.jdwp.JDWPPacket;
import cc.squirreljme.jdwp.host.views.JDWPViewThread;
import cc.squirreljme.jdwp.host.views.JDWPViewThreadGroup;
import java.util.ArrayList;
import java.util.List;

/**
 * Thread group reference commands.
 *
 * @since 2021/03/13
 */
public enum JDWPHostCommandSetThreadGroupReference
    implements JDWPCommandHandler
{
    /** The name of the group. */
    NAME(JDWPCommandSetThreadGroupReference.NAME)
    {
        /**
         * {@inheritDoc}
         * @since 2021/03/13
         */
        @Override
        public JDWPPacket execute(JDWPHostController __controller,
            JDWPPacket __packet)
            throws JDWPException
        {
            JDWPViewThreadGroup view = __controller.viewThreadGroup();
            
            // Is this valid?
            Object group = __controller.readThreadGroup(__packet, false);
            
            JDWPPacket rv = __controller.reply(
                __packet.id(), JDWPErrorType.NO_ERROR);
            
            // Matches the string representation of the group
            rv.writeString(view.name(group));
            
            return rv;
        }
    },
    
    /** The parent thread group. */
    PARENT(JDWPCommandSetThreadGroupReference.PARENT)
    {
        /**
         * {@inheritDoc}
         * @since 2021/03/13
         */
        @Override
        public JDWPPacket execute(JDWPHostController __controller,
            JDWPPacket __packet)
            throws JDWPException
        {
            // Is this valid?
            __controller.readThreadGroup(__packet, false);
            
            JDWPPacket rv = __controller.reply(
                __packet.id(), JDWPErrorType.NO_ERROR);
            
            // There are never any parent thread groups
            rv.writeId(0);
            
            return rv;
        }
    },
    
    /** The children thread groups and threads. */
    CHILDREN(JDWPCommandSetThreadGroupReference.CHILDREN)
    {
        /**
         * {@inheritDoc}
         * @since 2021/03/13
         */
        @Override
        public JDWPPacket execute(JDWPHostController __controller,
            JDWPPacket __packet)
            throws JDWPException
        {
            JDWPViewThreadGroup groupView = __controller.viewThreadGroup();
            JDWPViewThread threadView = __controller.viewThread();
            
            // Is this valid?
            Object group = __controller.readThreadGroup(__packet, false);
                
            JDWPPacket rv = __controller.reply(
                __packet.id(), JDWPErrorType.NO_ERROR);
            
            // Filter out terminated, frameless, and debug threads (callbacks?)
            List<Object> threads = new ArrayList<>();
            for (Object thread : groupView.threads(group))
                if (JDWPHostUtils.isVisibleThread(threadView, thread))
                    threads.add(thread);
            
            // Write number of child threads
            rv.writeInt(threads.size());
            
            // Record all of their IDs
            for (Object thread : threads)
            {
                Object threadInstance = threadView.instance(thread);
                __controller.writeObject(rv, threadInstance);
                
                // Store for later referencing
                __controller.getState().items.put(thread);
                __controller.getState().items.put(threadInstance);
            }
            
            // There are never any child thread groups
            rv.writeInt(0);
            
            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 2021/03/13
     */
    JDWPHostCommandSetThreadGroupReference(JDWPCommand __id)
    {
        this.command = __id;
        this.id = __id.debuggerId();
    }
    
    /**
     * {@inheritDoc}
     * @since 2024/01/23
     */
    @Override
    public final JDWPCommand command()
    {
        return this.command;
    }
    
    /**
     * {@inheritDoc}
     * @since 2021/03/13
     */
    @Override
    public final int debuggerId()
    {
        return this.id;
    }
}