src/main/java/design/persistence/importexport/JSONHandler.java


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package design.persistence.importexport;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.json.JsonMapper;
import design.persistence.Serializers;

import java.io.File;
import java.io.IOException;

public class JSONHandler implements DataHandler {

    private final DataSource dataSource;
    private final ObjectMapper jsonMapper = new JsonMapper();

    public JSONHandler(DataSource dataSource) {
        this.dataSource = dataSource;

        Serializers.configureMapper(jsonMapper);
        jsonMapper.registerModule(dataSource.getJacksonModule());
    }

    @Override
    public void importData(File file) throws IOException {
        Object data = jsonMapper.readValue(file, dataSource.getTargetClass());
        dataSource.importData(data);
    }

    @Override
    public void exportData(File file) throws IOException{
        Object data = dataSource.exportData();
        jsonMapper.writer(new Serializers.CustomPrettyPrinter())
                .writeValue(file, data);
    }
}