com.sun.jdi.request

## Interface StepRequest

- All Superinterfaces:
    EventRequest, Mirror

      public interface StepRequest
      extends EventRequest

  Request for notification when a step occurs in the target VM. When an enabled StepRequest is satisfied, an `event set` containing a `StepEvent` will be placed on the `EventQueue`. The collection of existing StepRequests is managed by the `EventRequestManager`
  Since:
    1.3
  See Also:
    `StepEvent`, `EventQueue`, `EventRequestManager`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `STEP_INTO` Step into any newly pushed frames
    `static int` | `STEP_LINE` Step to the next location on a different line
    `static int` | `STEP_MIN` Step to the next available location
    `static int` | `STEP_OUT` Step out of the current frame
    `static int` | `STEP_OVER` Step over any newly pushed frames

    - ### Fields inherited from interface com.sun.jdi.request.EventRequest

      `SUSPEND_ALL, SUSPEND_EVENT_THREAD, SUSPEND_NONE`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addClassExclusionFilter(String classPattern)` Restricts the events generated by this request to those whose location is in a class whose name does not match a restricted regular expression.
    `void` | `addClassFilter(ReferenceType refType)` Restricts the events generated by this request to those whose location is in the given reference type or any of its subtypes.
    `void` | `addClassFilter(String classPattern)` Restricts the events generated by this request to those whose location is in a class whose name matches a restricted regular expression.
    `void` | `addInstanceFilter(ObjectReference instance)` Restricts the events generated by this request to those in which the currently executing instance ("this") is the object specified.
    `int` | `depth()`
    `int` | `size()`
    `ThreadReference` | `thread()`

    - ### Methods inherited from interface com.sun.jdi.request.EventRequest

      `addCountFilter, disable, enable, getProperty, isEnabled, putProperty, setEnabled, setSuspendPolicy, suspendPolicy`

    - ### Methods inherited from interface com.sun.jdi.Mirror

      `toString, virtualMachine`

- - ### Field Detail

    - #### STEP_INTO

          static final int STEP_INTO

      Step into any newly pushed frames
      See Also:
        Constant Field Values

    - #### STEP_OVER

          static final int STEP_OVER

      Step over any newly pushed frames
      See Also:
        Constant Field Values

    - #### STEP_OUT

          static final int STEP_OUT

      Step out of the current frame
      See Also:
        Constant Field Values

    - #### STEP_MIN

          static final int STEP_MIN

      Step to the next available location
      See Also:
        Constant Field Values

    - #### STEP_LINE

          static final int STEP_LINE

      Step to the next location on a different line
      See Also:
        Constant Field Values

  - ### Method Detail

    - #### thread

          ThreadReference thread()

      Returns:
        the thread on which the step event is being requested.

    - #### size

          int size()

      Returns:
        the step size

    - #### depth

          int depth()

      Returns:
        the step depth

    - #### addClassFilter

          void addClassFilter(ReferenceType refType)

      Restricts the events generated by this request to those whose location is in the given reference type or any of its subtypes. An event will be generated for any location in a reference type that can be safely cast to the given reference type.
      Parameters:
        `refType` - the reference type to filter on.
      Throws:
        `InvalidRequestStateException` - if this request is currently enabled or has been deleted. Filters may be added only to disabled requests.

    - #### addClassFilter

          void addClassFilter(String classPattern)

      Restricts the events generated by this request to those whose location is in a class whose name matches a restricted regular expression. Regular expressions are limited to exact matches and patterns that begin with '*' or end with '*'; for example, "*.Foo" or "java.*".
      Parameters:
        `classPattern` - the pattern String to filter for.
      Throws:
        `InvalidRequestStateException` - if this request is currently enabled or has been deleted. Filters may be added only to disabled requests.

    - #### addClassExclusionFilter

          void addClassExclusionFilter(String classPattern)

      Restricts the events generated by this request to those whose location is in a class whose name does not match a restricted regular expression. Regular expressions are limited to exact matches and patterns that begin with '*' or end with '*'; for example, "*.Foo" or "java.*".
      Parameters:
        `classPattern` - the pattern String to filter against.
      Throws:
        `InvalidRequestStateException` - if this request is currently enabled or has been deleted. Filters may be added only to disabled requests.

    - #### addInstanceFilter

          void addInstanceFilter(ObjectReference instance)

      Restricts the events generated by this request to those in which the currently executing instance ("this") is the object specified.

      Not all targets support this operation. Use `VirtualMachine.canUseInstanceFilters()` to determine if the operation is supported.

      Parameters:
        `instance` - the object which must be the current instance in order to pass this filter.
      Throws:
        `UnsupportedOperationException` - if the target virtual machine does not support this operation.
        `InvalidRequestStateException` - if this request is currently enabled or has been deleted. Filters may be added only to disabled requests.
      Since:
        1.4

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