Gradle (Gradle API 2.9)
Date: 2015-11-17

org.gradle.api.invocation

## Interface Gradle

- All Superinterfaces:
    PluginAware

      public interface Gradle
      extends PluginAware

  Represents an invocation of Gradle.

  You can obtain a `Gradle` instance by calling `Project.getGradle()`.

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addBuildListener(BuildListener buildListener)` Adds a `BuildListener` to this Build instance.
    `void` | `addListener(Object listener)` Adds the given listener to this build.
    `ProjectEvaluationListener` | `addProjectEvaluationListener(ProjectEvaluationListener listener)` Adds a listener to this build, to receive notifications as projects are evaluated.
    `void` | `afterProject(Closure closure)` Adds a closure to be called immediately after a project is evaluated.
    `void` | `allprojects(Action<? super Project> action)` Adds an action to execute against all projects of this build.
    `void` | `beforeProject(Closure closure)` Adds a closure to be called immediately before a project is evaluated.
    `void` | `buildFinished(Closure closure)` Adds a closure to be called when the build is completed.
    `void` | `buildStarted(Closure closure)` Adds a closure to be called when the build is started.
    `Gradle` | `getGradle()` Returns this `Gradle` instance.
    `File` | `getGradleHomeDir()` Returns the Gradle home directory, if any.
    `File` | `getGradleUserHomeDir()` Returns the Gradle user home directory.
    `String` | `getGradleVersion()` Returns the current Gradle version.
    `Gradle` | `getParent()` Returns the parent build of this build, if any.
    `Project` | `getRootProject()` Returns the root project of this build.
    `StartParameter` | `getStartParameter()` Returns the `StartParameter` used to start this build.
    `TaskExecutionGraph` | `getTaskGraph()` Returns the `TaskExecutionGraph` for this build.
    `void` | `projectsEvaluated(Closure closure)` Adds a closure to be called when all projects for the build have been evaluated.
    `void` | `projectsLoaded(Closure closure)` Adds a closure to be called when the projects for the build have been created from the settings.
    `void` | `removeListener(Object listener)` Removes the given listener from this build.
    `void` | `removeProjectEvaluationListener(ProjectEvaluationListener listener)` Removes the given listener from this build.
    `void` | `rootProject(Action<? super Project> action)` Adds an action to execute against the root project of this build.
    `void` | `settingsEvaluated(Closure closure)` Adds a closure to be called when the build settings have been loaded and evaluated.
    `void` | `useLogger(Object logger)` Uses the given object as a logger.

    - ### Methods inherited from interface org.gradle.api.plugins.PluginAware

      `apply, apply, apply, getPluginManager, getPlugins`

- - ### Method Detail

    - #### getGradleVersion

          String getGradleVersion()

      Returns the current Gradle version.
      Returns:
        The Gradle version. Never returns null.

    - #### getGradleUserHomeDir

          File getGradleUserHomeDir()

      Returns the Gradle user home directory. This directory is used to cache downloaded resources, compiled build scripts and so on.
      Returns:
        The user home directory. Never returns null.

    - #### getGradleHomeDir

          File getGradleHomeDir()

      Returns the Gradle home directory, if any. This directory is the directory containing the Gradle distribution executing this build.

      When using the “Gradle Daemon”, this may not be the same Gradle distribution that the build was started with. If an existing daemon process is running that is deemed compatible (e.g. has the desired JVM characteristics) then this daemon may be used instead of starting a new process and it may have been started from a different “gradle home”. However, it is guaranteed to be the same version of Gradle. For more information on the Gradle Daemon, please consult the user guide.

      Returns:
        The home directory. May return null.

    - #### getParent

          Gradle getParent()

      Returns the parent build of this build, if any.
      Returns:
        The parent build. May return null.

    - #### getRootProject

          Project getRootProject()
                                 throws IllegalStateException

      Returns the root project of this build.
      Returns:
        The root project. Never returns null.
      Throws:
        `IllegalStateException` - When called before the root project is available.

    - #### rootProject

          void rootProject(Action<? super Project> action)

      Adds an action to execute against the root project of this build. If the root project is already available, the action is executed immediately. Otherwise, the action is executed when the root project becomes available.
      Parameters:
        `action` - The action to execute.

    - #### allprojects

          void allprojects(Action<? super Project> action)

      Adds an action to execute against all projects of this build. The action is executed immediately against all projects which are already available. It is also executed as subsequent projects are added to this build.
      Parameters:
        `action` - The action to execute.

    - #### getTaskGraph

          TaskExecutionGraph getTaskGraph()

      Returns the `TaskExecutionGraph` for this build.
      Returns:
        The task graph. Never returns null.

    - #### getStartParameter

          StartParameter getStartParameter()

      Returns the `StartParameter` used to start this build.
      Returns:
        The start parameter. Never returns null.

    - #### addProjectEvaluationListener

          ProjectEvaluationListener addProjectEvaluationListener(ProjectEvaluationListener listener)

      Adds a listener to this build, to receive notifications as projects are evaluated.
      Parameters:
        `listener` - The listener to add. Does nothing if this listener has already been added.
      Returns:
        The added listener.

    - #### removeProjectEvaluationListener

          void removeProjectEvaluationListener(ProjectEvaluationListener listener)

      Removes the given listener from this build.
      Parameters:
        `listener` - The listener to remove. Does nothing if this listener has not been added.

    - #### beforeProject

          void beforeProject(Closure closure)

      Adds a closure to be called immediately before a project is evaluated. The project is passed to the closure as a parameter.
      Parameters:
        `closure` - The closure to execute.

    - #### afterProject

          void afterProject(Closure closure)

      Adds a closure to be called immediately after a project is evaluated. The project is passed to the closure as the first parameter. The project evaluation failure, if any, is passed as the second parameter. Both parameters are optional.
      Parameters:
        `closure` - The closure to execute.

    - #### buildStarted

          void buildStarted(Closure closure)

      Adds a closure to be called when the build is started. This `Gradle` instance is passed to the closure as the first parameter.
      Parameters:
        `closure` - The closure to execute.

    - #### settingsEvaluated

          void settingsEvaluated(Closure closure)

      Adds a closure to be called when the build settings have been loaded and evaluated. The settings object is fully configured and is ready to use to load the build projects. The `Settings` object is passed to the closure as a parameter.
      Parameters:
        `closure` - The closure to execute.

    - #### projectsLoaded

          void projectsLoaded(Closure closure)

      Adds a closure to be called when the projects for the build have been created from the settings. None of the projects have been evaluated. This `Gradle` instance is passed to the closure as a parameter.

      An example of hooking into the projectsLoaded to configure buildscript classpath from the init script.

           //init.gradle
           gradle.projectsLoaded {
             rootProject.buildscript {
               repositories {
                 //...
               }
               dependencies {
                 //...
               }
             }
           }

      Parameters:
        `closure` - The closure to execute.

    - #### projectsEvaluated

          void projectsEvaluated(Closure closure)

      Adds a closure to be called when all projects for the build have been evaluated. The project objects are fully configured and are ready to use to populate the task graph. This `Gradle` instance is passed to the closure as a parameter.
      Parameters:
        `closure` - The closure to execute.

    - #### buildFinished

          void buildFinished(Closure closure)

      Adds a closure to be called when the build is completed. All selected tasks have been executed. A `BuildResult` instance is passed to the closure as a parameter.
      Parameters:
        `closure` - The closure to execute.

    - #### addBuildListener

          void addBuildListener(BuildListener buildListener)

      Adds a `BuildListener` to this Build instance. The listener is notified of events which occur during the execution of the build.
      Parameters:
        `buildListener` - The listener to add.

    - #### addListener

          void addListener(Object listener)

      Adds the given listener to this build. The listener may implement any of the given listener interfaces:
      - `BuildListener`
      - `TaskExecutionGraphListener`
      - `ProjectEvaluationListener`
      - `TaskExecutionListener`
      - `TaskActionListener`
      - `StandardOutputListener`
      - `TestListener`
      - `TestOutputListener`
      - `DependencyResolutionListener`
      Parameters:
        `listener` - The listener to add. Does nothing if this listener has already been added.

    - #### removeListener

          void removeListener(Object listener)

      Removes the given listener from this build.
      Parameters:
        `listener` - The listener to remove. Does nothing if this listener has not been added.

    - #### useLogger

          void useLogger(Object logger)

      Uses the given object as a logger. The logger object may implement any of the listener interfaces supported by `addListener(Object)`.

      Each listener interface has exactly one associated logger. When you call this method with a logger of a given listener type, the new logger will replace whichever logger is currently associated with the listener type. This allows you to selectively replace the standard logging which Gradle provides with your own implementation, for certain types of events.

      Parameters:
        `logger` - The logger to use.

    - #### getGradle

          Gradle getGradle()

      Returns this `Gradle` instance. This method is useful in init scripts to explicitly access Gradle properties and methods. For example, using `gradle.parent` can express your intent better than using `parent`. This property also allows you to access Gradle properties from a scope where the property may be hidden, such as, for example, from a method or closure.
      Returns:
        this. Never returns null.