net.caseif.flint.common.util.helper.JsonHelper.java Source code

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Here is the source code for net.caseif.flint.common.util.helper.JsonHelper.java

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015-2016, Max Roncace <me@caseif.net>
 *
 * 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 net.caseif.flint.common.util.helper;

import com.google.common.base.Optional;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.nio.file.Files;

public class JsonHelper {

    public static JsonObject readOrCreateJson(File file) throws IOException {
        if (file.exists()) {
            try (FileReader reader = new FileReader(file)) {
                JsonElement el = new JsonParser().parse(reader);
                return el.isJsonObject() ? el.getAsJsonObject() : new JsonObject();
            }
        } else {
            Files.createFile(file.toPath());
            return new JsonObject();
        }
    }

    public static Optional<JsonObject> readJson(File file) throws IllegalArgumentException, IOException {
        if (file.exists()) {
            try (FileReader reader = new FileReader(file)) {
                JsonElement el = new JsonParser().parse(reader);
                if (el.isJsonObject()) {
                    return Optional.of(el.getAsJsonObject());
                }
            }
        }
        return Optional.absent();
    }

}