Package org.apache.tapestry5.internal.services

## Class EnvironmentImpl

- java.lang.Object
- - org.apache.tapestry5.internal.services.EnvironmentImpl

- All Implemented Interfaces:
    `Environment`

      public class EnvironmentImpl
      extends Object
      implements Environment

  A non-threadsafe implementation (expects to use the "perthread" service lifecyle).

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `EnvironmentImpl()` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `cloak()` | Hides all current environment values, making the Environment object appear empty, until a call to `Environment.decloak()`} restores the original state.
    `void` | `decloak()` | Restores state previously hidden by `Environment.cloak()`}.
    `<T> T` | `peek​(Class<T> type)` | Peeks at the current top of the indicated stack.
    `<T> T` | `peekRequired​(Class<T> type)` | Peeks at the current top of the indicated stack (which must have a non-null value).
    `<T> T` | `pop​(Class<T> type)` | Removes and returns the top environmental object of the selected type.
    `<T> T` | `push​(Class<T> type, T instance)` | Pushes a new service onto the stack.
    `void` | `threadDidCleanup()` |

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### EnvironmentImpl

          public EnvironmentImpl()

  - ### Method Detail

    - #### peek

          public <T> T peek​(Class<T> type)

      Description copied from interface: `Environment`
      Peeks at the current top of the indicated stack.
      Specified by:
        `peek` in interface `Environment`
      Type Parameters:
        `T` - the type of environmental object
      Parameters:
        `type` - class used to select the object
      Returns:
        the current object of that type, or null if no service of that type has been added

    - #### peekRequired

          public <T> T peekRequired​(Class<T> type)

      Description copied from interface: `Environment`
      Peeks at the current top of the indicated stack (which must have a non-null value).
      Specified by:
        `peekRequired` in interface `Environment`
      Type Parameters:
        `T` - the type of environmental object
      Parameters:
        `type` - class used to select the object
      Returns:
        the current object of the specified type

    - #### pop

          public <T> T pop​(Class<T> type)

      Description copied from interface: `Environment`
      Removes and returns the top environmental object of the selected type.
      Specified by:
        `pop` in interface `Environment`
      Type Parameters:
        `T` - the type of environmental object
      Parameters:
        `type` - class used to select the object
      Returns:
        the object just removed

    - #### push

          public <T> T push​(Class<T> type,
                            T instance)

      Description copied from interface: `Environment`
      Pushes a new service onto the stack. The old service at the top of the stack is returned (it may be null).
      Specified by:
        `push` in interface `Environment`
      Type Parameters:
        `T` - the type of environmental object
      Parameters:
        `type` - class used to select the object
        `instance` - the service object
      Returns:
        the previous top service

    - #### threadDidCleanup

          public void threadDidCleanup()

    - #### cloak

          public void cloak()

      Description copied from interface: `Environment`
      Hides all current environment values, making the Environment object appear empty, until a call to `Environment.decloak()`} restores the original state.
      Specified by:
        `cloak` in interface `Environment`
      See Also:
        `TapestryConstants.RESPONSE_RENDERER`

    - #### decloak

          public void decloak()

      Description copied from interface: `Environment`
      Restores state previously hidden by `Environment.cloak()`}.
      Specified by:
        `decloak` in interface `Environment`
      See Also:
        `TapestryConstants.RESPONSE_RENDERER`