net.fabricmc.installer.util.InstallerMetadata.java Source code

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Here is the source code for net.fabricmc.installer.util.InstallerMetadata.java

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/*
 * Copyright (c) 2016, 2017, 2018 FabricMC
 *
 * 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.fabricmc.installer.util;

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

import java.io.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class InstallerMetadata {
    private static final Gson GSON = new Gson();
    private final JsonObject root;

    public InstallerMetadata(File workDir) throws IOException {
        File file = new File(workDir, Reference.INSTALLER_METADATA_FILENAME);
        try (FileInputStream inputStream = new FileInputStream(file)) {
            try (InputStreamReader reader = new InputStreamReader(inputStream)) {
                root = GSON.fromJson(reader, JsonObject.class);
            }
        }
    }

    public InstallerMetadata(InputStream inputStream) throws IOException {
        try (InputStreamReader reader = new InputStreamReader(inputStream)) {
            root = GSON.fromJson(reader, JsonObject.class);
        }
    }

    public int getVersion() {
        return root.get("version").getAsInt();
    }

    public String getMainClass() {
        return root.get("mainClass").getAsString();
    }

    public List<LibraryEntry> getLibraries(String... sides) {
        return getObjectsSubKeyed(root, "libraries", sides).map((e) -> {
            JsonObject o = e.getAsJsonObject();
            return new LibraryEntry(o.get("name").getAsString(), o.has("url") ? o.get("url").getAsString() : null);
        }).collect(Collectors.toList());
    }

    public List<String> getArguments(String... sides) {
        return getObjectsSubKeyed(root, "arguments", sides).map(JsonElement::getAsString)
                .collect(Collectors.toList());
    }

    public List<String> getTweakers(String... sides) {
        if (!root.has("launchwrapper")) {
            return Collections.emptyList();
        }

        return getObjectsSubKeyed(root.getAsJsonObject("launchwrapper"), "tweakers", sides)
                .map(JsonElement::getAsString).collect(Collectors.toList());
    }

    private Stream<JsonElement> getObjectsSubKeyed(JsonObject baseObj, String key, String... subKeys) {
        if (!baseObj.has(key)) {
            return Stream.empty();
        }

        List<JsonElement> list = new ArrayList<>();
        JsonObject keyObj = baseObj.getAsJsonObject(key);

        for (String s : subKeys) {
            if (keyObj.has(s)) {
                JsonArray array = keyObj.getAsJsonArray(s);
                for (JsonElement element : array) {
                    list.add(element);
                }
            }
        }

        return list.stream();
    }

    public static class LibraryEntry {
        private final String name, url;

        public LibraryEntry(String name, String url) {
            this.name = name;
            this.url = url != null ? url : Reference.MAVEN_DEFAULT_LIBRARY_URL;
        }

        public String getName() {
            return name;
        }

        public String getFilename() {
            String[] splitName = name.split(":");
            if (splitName.length != 3) {
                throw new RuntimeException("Unsupported dependency " + name);
            }

            return splitName[1] + "-" + splitName[2] + ".jar";
        }

        public String getFullURL() {
            String[] splitName = name.split(":");
            if (splitName.length != 3) {
                throw new RuntimeException("Unsupported dependency " + name);
            }

            return MavenHandler.getPath(getURL(), splitName[0], splitName[1], splitName[2]);
        }

        public String getURL() {
            return url;
        }

        public JsonObject toVanillaEntry() {
            JsonObject object = new JsonObject();
            object.addProperty("name", name);
            object.addProperty("url", url);
            return object;
        }
    }
}