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Kiwi is a utility library. We really like Google's Guava, and also use Apache Commons. But if they don't have something we need, and we think it is useful, this is where we put it.

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package org.kiwiproject.dropwizard.jdbi3;

import static org.apache.commons.lang3.BooleanUtils.isTrue;

import lombok.experimental.UtilityClass;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.tuple.Pair;
import org.jdbi.v3.core.spi.JdbiPlugin;

import java.util.Optional;

/**
 * Utilities for JDBI 3.
 */
@UtilityClass
@Slf4j
class Jdbi3Helpers {

    /**
     * Get a plugin instance for the given class name.
     *
     * @param pluginClassName the plugin class name
     * @return an Optional containing a plugin instance, or empty Optional if plugin class not available or an error
     * occurs. If an error occurs, that fact is logged at WARN level.
     */
    static Optional getPluginInstance(String pluginClassName) {
        var result = isPluginAvailable(pluginClassName);

        if (isTrue(result.getLeft())) {
            try {
                var pluginClass = result.getRight();
                var pluginInstance = (JdbiPlugin) pluginClass.getDeclaredConstructor().newInstance();
                return Optional.of(pluginInstance);
            } catch (Exception e) {
                LOG.warn("Error instantiating plugin for class: {}", pluginClassName);
                return Optional.empty();
            }
        }

        return Optional.empty();
    }

    private static Pair> isPluginAvailable(String pluginClassName) {
        try {
            var pluginClass = Class.forName(pluginClassName);
            return Pair.of(true, pluginClass);
        } catch (ClassNotFoundException e) {
            return Pair.of(false, null);
        }
    }
}