Skill.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) 2006-2011 Andreas Kirschbaum.
 */

package com.realtime.crossfire.jxclient.skills;

import com.realtime.crossfire.jxclient.util.EventListenerList2;
import org.jetbrains.annotations.NotNull;

public class Skill {

    @NotNull
    private final EventListenerList2<SkillListener> listeners = new EventListenerList2<>();

    @NotNull
    private final String name;

    private int face = -1;

    private long experience;

    private int level;

    public Skill(@NotNull final String name) {
        this.name = name;
    }

    public void set(final int level, final long experience) {
        if (this.level == level && this.experience == experience) {
            return;
        }

        final boolean oldKnown = isKnown();
        this.level = level;
        this.experience = experience;
        fireEvents(oldKnown);
    }

    public long getExperience() {
        return experience;
    }

    public int getLevel() {
        return level;
    }

    public int getFace() {
        return face;
    }

    public void setFace(final int face) {
        this.face = face;
    }

    private boolean isKnown() {
        return experience != 0 || level != 0;
    }

    @NotNull
    @Override
    public String toString() {
        return name;
    }

    private void fireEvents(final boolean oldKnown) {
        final boolean newKnown = isKnown();

        if (!oldKnown) {
            assert newKnown;
            fireAddSkill();
        } else if (!newKnown) {
            fireDelSkill();
        } else {
            fireUpdSkill();
        }
    }

    private void fireAddSkill() {
        for (final SkillListener listener : listeners) {
            listener.gainedSkill();
        }
    }

    private void fireDelSkill() {
        for (final SkillListener listener : listeners) {
            listener.lostSkill();
        }
    }

    private void fireUpdSkill() {
        for (final SkillListener listener : listeners) {
            listener.changedSkill();
        }
    }

    public void addSkillListener(@NotNull final SkillListener listener) {
        listeners.add(listener);
    }

    public void removeSkillListener(@NotNull final SkillListener listener) {
        listeners.remove(listener);
    }

}