org.libraryweasel.configmanager.JsonConfigManager.java Source code

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Here is the source code for org.libraryweasel.configmanager.JsonConfigManager.java

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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.libraryweasel.configmanager;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.libraryweasel.configmanager.api.ConfigManager;
import org.libraryweasel.plugin.file.InstancePathsService;
import org.libraryweasel.servo.Component;
import org.libraryweasel.servo.Service;

import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;

@Component(ConfigManager.class)
public class JsonConfigManager implements ConfigManager {
    @Service
    private volatile InstancePathsService pathsService;
    private ObjectMapper objectMapper = new ObjectMapper();

    @Override
    public <T> T read(String name, Class<T> configurationClass) {
        Path path = pathsService.getInstancePath("config/" + name + ".json");
        try {
            return objectMapper.readValue(path.toFile(), configurationClass);
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    @Override
    public <T> void write(String name, T instance) {
        Path path = pathsService.getInstancePath("config/" + name + ".json");
        try {
            objectMapper.writeValue(path.toFile(), instance);
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    @Override
    public List<String> getConfigurations() {
        List<String> result = new ArrayList<>();
        Path dir = pathsService.getInstancePath("config/");
        try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir, "*.{json}")) {
            for (Path entry : stream) {
                result.add(entry.getFileName().toString());
            }
        } catch (IOException ex) {
            throw new RuntimeException(ex);
        }
        return result;
    }
}