pollymc/libraries/launcher/net/minecraft/Launcher.java

/*
 * Copyright 2012-2021 MultiMC Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.minecraft;

import java.applet.Applet;
import java.applet.AppletStub;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Map;
import java.util.TreeMap;

/**
 * WARNING: This class is reflectively accessed by legacy Forge versions.
 * <p>
 * Changing field and method declarations without further testing is not recommended.
 */
public final class Launcher extends Applet implements AppletStub {

    private final Map<String, String> params = new TreeMap<>();

    private Applet wrappedApplet;

    private final URL documentBase;

    private boolean active = false;

    public Launcher(Applet applet) {
        this(applet, null);
    }

    public Launcher(Applet applet, URL documentBase) {
        super();
        this.setLayout(new BorderLayout());

        this.add(applet, "Center");

        this.wrappedApplet = applet;

        try {
            if (documentBase != null) {
                this.documentBase = documentBase;
            } else if (applet.getClass().getPackage().getName().startsWith("com.mojang")) {
                // Special case only for Classic versions

                // TODO: 2022-10-27 Can this be changed to https
                this.documentBase = new URL("http", "www.minecraft.net", 80, "/game/");
            } else {
                // TODO: 2022-10-27 Can this be changed to https?
                this.documentBase = new URL("http://www.minecraft.net/game/");
            }
        } catch (MalformedURLException e) {
            throw new RuntimeException(e);
        }
    }

    public void replace(Applet applet) {
        this.wrappedApplet = applet;

        applet.setStub(this);
        applet.setSize(getWidth(), getHeight());

        this.setLayout(new BorderLayout());
        this.add(applet, "Center");

        applet.init();

        active = true;

        applet.start();

        validate();
    }

    @Override
    public boolean isActive() {
        return active;
    }

    @Override
    public URL getDocumentBase() {
        return documentBase;
    }

    @Override
    public URL getCodeBase() {
        try {
            // TODO: 2022-10-27 Can this be changed to https?
            return new URL("http://www.minecraft.net/game/");
        } catch (MalformedURLException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public String getParameter(String name) {
        String param = params.get(name);

        if (param != null)
            return param;

        try {
            return super.getParameter(name);
        } catch (Exception ignored) {
        }

        return null;
    }

    @Override
    public void resize(int width, int height) {
        wrappedApplet.resize(width, height);
    }

    @Override
    public void resize(Dimension d) {
        wrappedApplet.resize(d);
    }

    @Override
    public void init() {
        if (wrappedApplet != null)
            wrappedApplet.init();
    }

    @Override
    public void start() {
        wrappedApplet.start();

        active = true;
    }

    @Override
    public void stop() {
        wrappedApplet.stop();

        active = false;
    }

    @Override
    public void destroy() {
        wrappedApplet.destroy();
    }

    @Override
    public void appletResize(int width, int height) {
        wrappedApplet.resize(width, height);
    }

    @Override
    public void setVisible(boolean visible) {
        super.setVisible(visible);

        wrappedApplet.setVisible(visible);
    }

    @Override
    public void paint(Graphics paramGraphics) {
    }

    @Override
    public void update(Graphics paramGraphics) {
    }

    public void setParameter(String name, String value) {
        params.put(name, value);
    }

}