org.apache.jmeter.control

## Class WhileController

- java.lang.Object
- - org.apache.jmeter.testelement.AbstractTestElement
  - - org.apache.jmeter.control.GenericController
    - - org.apache.jmeter.control.WhileController

- All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable, Controller, IteratingController, LoopIterationListener, Searchable, TestElement, TestCompilerHelper

      public class WhileController
      extends GenericController
      implements java.io.Serializable, IteratingController

  See Also:
    Serialized Form

- - ### Field Summary

    - ### Fields inherited from class org.apache.jmeter.control.GenericController

      `current, subControllersAndSamplers`

    - ### Fields inherited from interface org.apache.jmeter.testelement.TestElement

      `COMMENTS, ENABLED, GUI_CLASS, NAME, TEST_CLASS`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `WhileController()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `breakLoop()` Break loop ("break" keyword equivalent)
    `java.lang.String` | `getCondition()`
    `void` | `iterationStart(LoopIterationEvent iterEvent)` Called when a loop iteration is about to start.
    `Sampler` | `next()` This skips controller entirely if the condition is false on first entry.
    `protected Sampler` | `nextIsNull()` Only called at End of Loop Called by `GenericController.next()` when `GenericController.getCurrentElement()` returns `null`.
    `protected void` | `resetLoopCount()`
    `void` | `setCondition(java.lang.String string)`
    `void` | `startNextLoop()` Start next iteration ("continue" keyword equivalent in loops)
    `void` | `triggerEndOfLoop()` Trigger end of loop condition on controller (used by Start Next Loop feature)

    - ### Methods inherited from class org.apache.jmeter.control.GenericController

      `addIterationListener, addTestElement, addTestElementOnce, currentReturnedNull, fireIterationStart, fireIterEvents, getCurrentElement, getIterCount, getSubControllers, incrementCurrent, incrementIterCount, initialize, initializeSubControllers, isDone, isFirst, nextIsAController, nextIsASampler, readResolve, reInitialize, removeCurrentElement, removeIterationListener, resetCurrent, resetIterCount, setCurrentElement, setDone, setFirst`

    - ### Methods inherited from class org.apache.jmeter.testelement.AbstractTestElement

      `addPropertiesValues, addProperty, addProperty, canRemove, clear, clearTemporary, clearTestElementChildren, clone, emptyTemporary, equals, getComment, getName, getProperty, getPropertyAsBoolean, getPropertyAsBoolean, getPropertyAsDouble, getPropertyAsFloat, getPropertyAsInt, getPropertyAsInt, getPropertyAsLong, getPropertyAsLong, getPropertyAsString, getPropertyAsString, getSearchableTokens, getThreadContext, getThreadName, hashCode, isEnabled, isRunningVersion, isTemporary, logProperties, mergeIn, propertyIterator, recoverRunningVersion, removeProperty, setComment, setEnabled, setName, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setRunningVersion, setTemporary, setThreadContext, setThreadName, traverse, traverseCollection, traverseMap, traverseProperty`

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

      `finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface org.apache.jmeter.control.IteratingController

      `updateIterationIndex`

    - ### Methods inherited from interface org.apache.jmeter.testelement.TestElement

      `canRemove, clear, clearTestElementChildren, clone, getComment, getName, getProperty, getPropertyAsBoolean, getPropertyAsBoolean, getPropertyAsDouble, getPropertyAsFloat, getPropertyAsInt, getPropertyAsInt, getPropertyAsLong, getPropertyAsLong, getPropertyAsString, getPropertyAsString, getThreadContext, getThreadName, isEnabled, isRunningVersion, isTemporary, propertyIterator, recoverRunningVersion, removed, removeProperty, setComment, setEnabled, setName, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setRunningVersion, setTemporary, setThreadContext, setThreadName, traverse`

- - ### Constructor Detail

    - #### WhileController

          public WhileController()

  - ### Method Detail

    - #### nextIsNull

          protected Sampler nextIsNull()
                                throws NextIsNullException

      Only called at End of Loop

      Called by `GenericController.next()` when `GenericController.getCurrentElement()` returns `null`. Reinitialises the controller.

      Overrides:
        `nextIsNull` in class `GenericController`
      Returns:
        null (always, for this class)
      Throws:
        `NextIsNullException` - when the end of the list has already been reached

    - #### triggerEndOfLoop

          public void triggerEndOfLoop()

      Trigger end of loop condition on controller (used by Start Next Loop feature)
      Specified by:
        `triggerEndOfLoop` in interface `Controller`
      Overrides:
        `triggerEndOfLoop` in class `GenericController`

    - #### next

          public Sampler next()

      This skips controller entirely if the condition is false on first entry.

      Determines the next sampler to be processed.

      If `GenericController.isDone()` is `true`, returns null.

      Gets the list element using current pointer. If this is `null`, calls `GenericController.nextIsNull()`.

      If the list element is a `Sampler`, calls `GenericController.nextIsASampler(Sampler)`, otherwise calls `GenericController.nextIsAController(Controller)`

      If any of the called methods throws `NextIsNullException`, returns `null`, otherwise the value obtained above is returned.

      Specified by:
        `next` in interface `Controller`
      Overrides:
        `next` in class `GenericController`
      Returns:
        the next sampler or `null`

    - #### resetLoopCount

          protected void resetLoopCount()

    - #### setCondition

          public void setCondition(java.lang.String string)

      Parameters:
        `string` - the condition to save

    - #### getCondition

          public java.lang.String getCondition()

      Returns:
        the condition

    - #### startNextLoop

          public void startNextLoop()

      Description copied from interface: `IteratingController`
      Start next iteration ("continue" keyword equivalent in loops)
      Specified by:
        `startNextLoop` in interface `IteratingController`

    - #### breakLoop

          public void breakLoop()

      Description copied from interface: `IteratingController`
      Break loop ("break" keyword equivalent)
      Specified by:
        `breakLoop` in interface `IteratingController`

    - #### iterationStart

          public void iterationStart(LoopIterationEvent iterEvent)

      Description copied from interface: `LoopIterationListener`
      Called when a loop iteration is about to start.
      Specified by:
        `iterationStart` in interface `LoopIterationListener`
      Parameters:
        `iterEvent` - the event

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