About.java

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/*
 * Gridarta MMORPG map editor for Crossfire, Daimonin and similar games.
 * Copyright (C) 2000-2023 The Gridarta Developers.
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
package net.sf.gridarta.gui.misc;
 
import java.awt.Component;
import java.lang.ref.WeakReference;
import javax.swing.Action;
import net.sf.gridarta.utils.EditorAction;
import net.sf.japi.swing.about.AboutDialog;
import net.sf.japi.swing.action.ActionBuilder;
import net.sf.japi.swing.action.ActionBuilderFactory;
import net.sf.japi.swing.action.ActionMethod;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
 
public class About implements EditorAction {
 
    @NotNull
    private static final ActionBuilder ACTION_BUILDER = ActionBuilderFactory.getInstance().getActionBuilder("net.sf.gridarta");
 
    @Nullable
    private WeakReference<AboutDialog> aboutDialogRef;
 
    @NotNull
    private final Component parent;
 
    @NotNull
    private final Object sync = new Object();
 
    public About(@NotNull final Component parent) {
        this.parent = parent;
    }
 
    @ActionMethod
    public void about() {
        AboutDialog aboutDialog;
        synchronized (sync) {
            if (aboutDialogRef == null) {
                aboutDialog = new AboutDialog(ACTION_BUILDER);
                aboutDialogRef = new WeakReference<>(aboutDialog);
            } else {
                aboutDialog = aboutDialogRef.get();
                if (aboutDialog == null) {
                    aboutDialog = new AboutDialog(ACTION_BUILDER);
                    aboutDialogRef = new WeakReference<>(aboutDialog);
                }
            }
        }
        aboutDialog.showAboutDialog(parent);
    }
 
    @Override
    public void setAction(@NotNull final Action action, @NotNull final String name) {
    }
 
}