paper-mc/paper-api/src/org/bukkit/plugin/PluginManager.java

package org.bukkit.plugin;

import java.io.File;

/**
 * Handles all plugin management from the Server
 */
public interface PluginManager {

    /**
     * Registers the specified plugin loader
     *
     * @param loader Class name of the PluginLoader to register
     * @throws IllegalArgumentException Thrown when the given Class is not a valid PluginLoader
     */
    void RegisterInterface(Class loader) throws IllegalArgumentException;

    /**
     * Checks if the given plugin is loaded and returns it when applicable
     *
     * Please note that the name of the plugin is case-sensitive
     *
     * @param name Name of the plugin to check
     * @return Plugin if it exists, otherwise null
     */
    Plugin getPlugin(String name);

    /**
     * Checks if the given plugin is enabled or not
     *
     * Please note that the name of the plugin is case-sensitive.
     *
     * @param name Name of the plugin to check
     * @return true if the plugin is enabled, otherwise false
     */
    boolean isPluginEnabled(String name);

    /**
     * Checks if the given plugin is enabled or not
     *
     * @param plugin Plugin to check
     * @return true if the plugin is enabled, otherwise false
     */
    boolean isPluginEnabled(Plugin plugin);

    /**
     * Loads the plugin in the specified file
     *
     * File must be valid according to the current enabled Plugin interfaces
     *
     * @param file File containing the plugin to load
     * @return The Plugin loaded, or null if it was invalid
     * @throws InvalidPluginException Thrown when the specified file is not a valid plugin
     */
    Plugin loadPlugin(File file) throws InvalidPluginException;

    /**
     * Loads the plugins contained within the specified directory
     *
     * @param directory Directory to check for plugins
     * @return A list of all plugins loaded
     */
    Plugin[] loadPlugins(File directory);
}