mcMMO/src/main/java/com/gmail/nossr50/database/DatabaseManagerFactory.java

package com.gmail.nossr50.database;

import com.gmail.nossr50.datatypes.database.DatabaseType;
import com.gmail.nossr50.mcMMO;

public class DatabaseManagerFactory {
    private final mcMMO pluginRef;
    private Class<? extends DatabaseManager> customManager = null;

    public DatabaseManagerFactory(mcMMO pluginRef) {
        this.pluginRef = pluginRef;
    }

    public DatabaseManager getDatabaseManager() {
        if (customManager != null) {
            try {
                return createDefaultCustomDatabaseManager();
            } catch (Exception e) {
                pluginRef.debug("Could not create custom database manager");
                e.printStackTrace();
            } catch (Throwable e) {
                pluginRef.debug("Failed to create custom database manager");
                e.printStackTrace();
            }
            pluginRef.debug("Falling back on " + (pluginRef.getMySQLConfigSettings().isMySQLEnabled() ? "SQL" : "Flatfile") + " database");
        }

        return pluginRef.getMySQLConfigSettings().isMySQLEnabled() ? new SQLDatabaseManager(pluginRef) : new FlatFileDatabaseManager(pluginRef);
    }

    public Class<? extends DatabaseManager> getCustomDatabaseManagerClass() {
        return customManager;
    }

    /**
     * Sets the custom DatabaseManager class for mcMMO to use. This should be
     * called prior to mcMMO enabling.
     * <p/>
     * The provided class must have an empty constructor, which is the one
     * that will be used.
     * <p/>
     * This method is intended for API use, but it should not be considered
     * stable. This method is subject to change and/or removal in future
     * versions.
     *
     * @param clazz the DatabaseManager class to use
     * @throws IllegalArgumentException if the provided class does not have
     *                                  an empty constructor
     */
    public void setCustomDatabaseManagerClass(Class<? extends DatabaseManager> clazz) {
        try {
            clazz.getConstructor();
            customManager = clazz;
        } catch (Throwable e) {
            throw new IllegalArgumentException("Provided database manager class must have an empty constructor", e);
        }
    }

    public DatabaseManager createDatabaseManager(DatabaseType type) {
        switch (type) {
            case FLATFILE:
                return new FlatFileDatabaseManager(pluginRef);

            case SQL:
                return new SQLDatabaseManager(pluginRef);

            case CUSTOM:
                try {
                    return createDefaultCustomDatabaseManager();
                } catch (Throwable e) {
                    e.printStackTrace();
                }

            default:
                return null;
        }
    }

    public DatabaseManager createDefaultCustomDatabaseManager() throws Throwable {
        return customManager.getConstructor().newInstance();
    }

    public static DatabaseManager createCustomDatabaseManager(Class<? extends DatabaseManager> clazz) throws Throwable {
        return clazz.getConstructor().newInstance();
    }
}