PendingDirections.java

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/*
 * This file is part of JXClient, the Fullscreen Java Crossfire Client.
 *
 * JXClient is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * JXClient 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JXClient; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Copyright (C) 2005-2008 Yann Chachkoff
 * Copyright (C) 2006-2017,2019-2023 Andreas Kirschbaum
 * Copyright (C) 2010-2012,2014-2018,2020-2023 Nicolas Weeger
 */
 
package com.realtime.crossfire.jxclient.map;
 
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import org.jetbrains.annotations.NotNull;
 
public class PendingDirections {
 
    @NotNull
    private final List<@NotNull Rec> pendingDirections = new ArrayList<>();
 
    @NotNull
    private State state = State.IDLE;
 
    private int runDirection = -1;
 
    public PendingDirections() {
        reset();
    }
 
    @NotNull
    public Iterable<@NotNull Integer> getPendingDirections() {
        synchronized (pendingDirections) {
            return pendingDirections.stream().map(Rec::getDirection).collect(Collectors.toList());
        }
    }
 
    public int getRunDirection() {
        synchronized (pendingDirections) {
            return runDirection;
        }
    }
 
    public void clear() {
        synchronized (pendingDirections) {
            reset();
            runDirection = -1;
        }
    }
 
    public void add(final int direction, final int packetNo) {
        synchronized (pendingDirections) {
            pendingDirections.add(new Rec(direction, packetNo));
        }
    }
 
    public void run(final int direction) {
        synchronized (pendingDirections) {
            runDirection = direction;
        }
    }
 
    public void comc(final int packetNo) {
        synchronized (pendingDirections) {
            if (pendingDirections.isEmpty()) {
                return;
            }
            final Rec rec = pendingDirections.get(0);
            if (rec.getPacketNo() != packetNo) {
                // ignore unrelated command
                return;
            }
            if (state != State.IDLE) {
                reset();
                return;
            }
            state = State.EXPECT_MAP_SCROLL_OR_TICK;
        }
    }
 
    public void mapScroll(final int direction) {
        synchronized (pendingDirections) {
            if (pendingDirections.isEmpty()) {
                return;
            }
 
            if (state != State.EXPECT_MAP_SCROLL_OR_TICK) {
                reset();
                return;
            }
 
            final Rec rec = pendingDirections.remove(0);
            if (rec.getDirection() != direction) {
                reset();
                return;
            }
 
            state = State.IDLE;
        }
    }
 
    public void tick() {
        synchronized (pendingDirections) {
            if (state == State.EXPECT_MAP_SCROLL_OR_TICK) {
                reset();
            } else if (state != State.IDLE) {
                state = State.IDLE;
            }
        }
    }
 
    private void reset() {
        synchronized (pendingDirections) {
            if (!pendingDirections.isEmpty()) {
                pendingDirections.clear();
            }
            if (state != State.IDLE) {
                state = State.IDLE;
            }
        }
    }
 
    @NotNull
    @Override
    public String toString() {
        return pendingDirections.toString();
    }
 
    private enum State {
 
        IDLE,
 
        EXPECT_MAP_SCROLL_OR_TICK,
 
        EXPECT_TICK,
 
    }
 
    private static class Rec {
 
        private final int direction;
 
        private final int packetNo;
 
        private Rec(final int direction, final int packetNo) {
            this.direction = direction;
            this.packetNo = packetNo;
        }
 
        private int getDirection() {
            return direction;
        }
 
        private int getPacketNo() {
            return packetNo;
        }
 
        @NotNull
        @Override
        public String toString() {
            return Integer.toString(direction);
        }
 
    }
 
}