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## org.apache.jmeter.protocol.http.modifier
Class ParamModifier

    java.lang.Object
      org.apache.jmeter.testelement.AbstractTestElement
          org.apache.jmeter.protocol.http.modifier.ParamModifier

All Implemented Interfaces:
  Serializable, Cloneable, PreProcessor, TestElement, TestListener

    public class ParamModifier

extends AbstractTestElement
implements TestListener, PreProcessor, Serializable

This modifier will replace any single http sampler's url parameter value with a value from a given range - thereby "masking" the value set in the http sampler. The parameter names must match exactly, and the parameter value must be preset to "*" to diferentiate between duplicate parameter names.

For example, if you set up the modifier with a lower bound of 1, an upper bound of 10, and an increment of 2, and run the loop 12 times, the parameter will have the following values (one per loop): 1, 3, 5, 7, 9, 1, 3, 5, 7, 9, 1, 3

The `ParamMask` object contains most of the logic for stepping through this loop. You can make large modifications to this modifier's behaviour by changing one or two method implementations there.

Version:
  $Revision: 905028 $
See Also:
  `ParamMask`, Serialized Form

Field Summary

Fields inherited from interface org.apache.jmeter.testelement.TestElement
`COMMENTS, ENABLED, GUI_CLASS, NAME, TEST_CLASS`

Constructor Summary
`ParamModifier()` Default constructor.

Method Summary
`ParamMask` | `getMask()`
`void` | `process()` Modifies an entry object to replace the value of any url parameter that matches a defined mask.
`void` | `testEnded()` Called once for all threads after the end of a test.
`void` | `testEnded(String host)` Called once for all threads after the end of a test.
`void` | `testIterationStart(LoopIterationEvent event)` Each time through a Thread Group's test script, an iteration event is fired for each thread.
`void` | `testStarted()` Called just before the start of the test from the main engine thread.
`void` | `testStarted(String host)` Called just before the start of the test from the main engine thread.

Methods inherited from class org.apache.jmeter.testelement.AbstractTestElement
`addProperty, addTestElement, canRemove, clear, clearTemporary, clone, emptyTemporary, equals, getComment, getName, getProperty, getPropertyAsBoolean, getPropertyAsBoolean, getPropertyAsDouble, getPropertyAsFloat, getPropertyAsInt, getPropertyAsInt, getPropertyAsLong, getPropertyAsLong, getPropertyAsString, getPropertyAsString, getThreadContext, getThreadName, hashCode, isEnabled, isRunningVersion, isTemporary, logProperties, mergeIn, propertyIterator, recoverRunningVersion, removeProperty, setComment, setName, 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`

Constructor Detail

### ParamModifier

    public ParamModifier()

  Default constructor.

Method Detail

### getMask

    public ParamMask getMask()

### testStarted

    public void testStarted()

  Description copied from interface: `TestListener`

  Called just before the start of the test from the main engine thread. This is before the test elements are cloned. Note that not all the test variables will have been set up at this point.

  N.B. testStarted() and testEnded() are called from different threads.

  Specified by:
    `testStarted` in interface `TestListener`
  See Also:
    `StandardJMeterEngine.run()`

### testStarted

    public void testStarted(String host)

  Description copied from interface: `TestListener`

  Called just before the start of the test from the main engine thread. This is before the test elements are cloned. Note that not all the test variables will have been set up at this point.

  N.B. testStarted() and testEnded() are called from different threads.

  Specified by:
    `testStarted` in interface `TestListener`
  Parameters:
    `host` - name of host
  See Also:
    `StandardJMeterEngine.run()`

### testEnded

    public void testEnded()

  Description copied from interface: `TestListener`

  Called once for all threads after the end of a test. This will use the same element instances as at the start of the test.

  N.B. testStarted() and testEnded() are called from different threads.

  Specified by:
    `testEnded` in interface `TestListener`
  See Also:
    `StandardJMeterEngine.stopTest()`

### testEnded

    public void testEnded(String host)

  Description copied from interface: `TestListener`

  Called once for all threads after the end of a test. This will use the same element instances as at the start of the test.

  N.B. testStarted() and testEnded() are called from different threads.

  Specified by:
    `testEnded` in interface `TestListener`
  Parameters:
    `host` - name of host
  See Also:
    `StandardJMeterEngine.stopTest()`

### process

    public void process()

  Modifies an entry object to replace the value of any url parameter that matches a defined mask.

  Specified by:
    `process` in interface `PreProcessor`

### testIterationStart

    public void testIterationStart(LoopIterationEvent event)

  Description copied from interface: `TestListener`
  Each time through a Thread Group's test script, an iteration event is fired for each thread. This will be after the test elements have been cloned, so in general the instance will not be the same as the ones the start/end methods call.

  Specified by:
    `testIterationStart` in interface `TestListener`
  See Also:
    `TestListener.testIterationStart(LoopIterationEvent)`

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