# Interface PluginManager

@NonExtensible public interface PluginManager
Facilitates applying plugins and determining which plugins have been applied to a `PluginAware` object.

Since:
  2.3
See Also:
  - `PluginAware`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `apply(Class<?> type)`
  Applies the given plugin.
  `void`
  `apply(String pluginId)`
  Applies the plugin with the given ID.
  `@Nullable AppliedPlugin`
  `findPlugin(String id)`
  Returns the information about the plugin that has been applied with the given ID, or null if no plugin has been applied with the given ID.
  `boolean`
  `hasPlugin(String id)`
  Returns `true` if a plugin with the given ID has already been applied, otherwise `false`.
  `void`
  `withPlugin(String id, Action<? super AppliedPlugin> action)`
  Executes the given action when the specified plugin is applied.

- ## Method Details

  - ### apply

    void apply(String pluginId)
    Applies the plugin with the given ID. Does nothing if the plugin has already been applied.

    Plugins in the `"org.gradle"` namespace can be applied directly via name. That is, the following two lines are equivalent…

        pluginManager.apply "org.gradle.java"
        pluginManager.apply "java"

    Parameters:
      `pluginId` - the ID of the plugin to apply
    Since:
      2.3

  - ### apply

    void apply(Class<?> type)
    Applies the given plugin. Does nothing if the plugin has already been applied.

    The given class should implement the `Plugin` interface, and be parameterized for a compatible type of `this`.

    The following two lines are equivalent…

        pluginManager.apply org.gradle.api.plugins.JavaPlugin
        pluginManager.apply "org.gradle.java"

    Parameters:
      `type` - the plugin class to apply
    Since:
      2.3

  - ### findPlugin

    @Nullable AppliedPlugin findPlugin(String id)
    Returns the information about the plugin that has been applied with the given ID, or null if no plugin has been applied with the given ID.

    Plugins in the `"org.gradle"` namespace (that is, core Gradle plugins) can be specified by either name (e.g. `"java"`) or ID `"org.gradle.java"`. All other plugins must be queried for by their full ID (e.g. `"org.company.some-plugin"`).

    Some Gradle plugins have not yet migrated to fully qualified plugin IDs. Such plugins can be detected with this method by simply using the unqualified ID (e.g. `"some-third-party-plugin"`.

    Parameters:
      `id` - the plugin ID
    Returns:
      information about the applied plugin, or `null` if no plugin has been applied with the given ID
    Since:
      2.3

  - ### hasPlugin

    boolean hasPlugin(String id)
    Returns `true` if a plugin with the given ID has already been applied, otherwise `false`.
    Parameters:
      `id` - the plugin ID. See `findPlugin(String)` for details about this parameter.
    Returns:
      `true` if the plugin has been applied
    Since:
      2.3

  - ### withPlugin

    void withPlugin(String id, Action<? super AppliedPlugin> action)
    Executes the given action when the specified plugin is applied.

    If a plugin with the specified ID has already been applied, the supplied action will be executed immediately. Otherwise, the action will executed immediately after a plugin with the specified ID is applied.

    The given action is always executed after the plugin has been applied.

    Parameters:
      `id` - the plugin ID. See `findPlugin(String)` for details about this parameter.
      `action` - the action to execute if/when the plugin is applied
    Since:
      2.3