MixinVanillaPack_Vanilla.java

/*
 * This file is part of Sponge, licensed under the MIT License (MIT).
 *
 * Copyright (c) SpongePowered <https://www.spongepowered.org>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.spongepowered.vanilla.mixin.core.resources;

import net.minecraft.resources.ResourcePackType;
import net.minecraft.resources.VanillaPack;
import net.minecraft.util.ResourceLocation;
import org.spongepowered.asm.mixin.Final;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.Overwrite;
import org.spongepowered.asm.mixin.Shadow;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Redirect;

import javax.annotation.Nullable;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.nio.file.FileSystem;
import java.nio.file.Files;
import java.util.Map;

@Mixin(VanillaPack.class)
public abstract class MixinVanillaPack_Vanilla {

    @Shadow @Final private static Map<ResourcePackType, FileSystem> field_217810_e;

    @Shadow
    private static String func_223458_d(final ResourcePackType p_223458_0_, final ResourceLocation p_223458_1_) {
        throw new RuntimeException("Mixin shadow method");
    }

    @Redirect(method = "getInputStreamVanilla(Lnet/minecraft/resources/ResourcePackType;Lnet/minecraft/util/ResourceLocation;)Ljava/io/InputStream;", at = @At(
            value = "INVOKE",
            target = "Ljava/net/URL;openStream()Ljava/io/InputStream;"
    ))
    public InputStream getInputStreamVanilla(final URL url, final ResourcePackType type, final ResourceLocation location) {
        final String path = func_223458_d(type, location);
        return this.vanilla$getExtraInputStream(type, path);
    }

    /**
     * @author Jamie Mansfield
     * @reason ForgeGradle splits the jar in two, one for the game's source code and another
     *         for the game's assets - this requires changes to the game to find assets in
     *         the extra jar.
     */
    @Nullable
    @Overwrite
    protected InputStream getInputStreamVanilla(final String path) {
        return this.vanilla$getExtraInputStream(ResourcePackType.SERVER_DATA, "/" + path);
    }

    public InputStream vanilla$getExtraInputStream(final ResourcePackType type, final String path) {
        final FileSystem fs = field_217810_e.get(type);
        if (fs != null) {
            try {
                return Files.newInputStream(fs.getPath(path));
            }
            catch (final IOException ignored) {
            }
        }

        return VanillaPack.class.getResourceAsStream(path);
    }

}