org.apache.jmeter.engine.util

## Class ValueReplacer

- java.lang.Object
- - org.apache.jmeter.engine.util.ValueReplacer

-     public class ValueReplacer
      extends Object

  Perform replacement of ${variable} references.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ValueReplacer()`
    `ValueReplacer(TestPlan tp)` Constructor which couples the given `TestPlan` to this by means of the user defined variables

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addVariable(String name, String value)` Add a variable to this replacer's variables map
    `void` | `addVariables(Map<String,String> vars)` Add all the given variables to this replacer's variables map.
    `void` | `replaceValues(TestElement el)` Replaces TestElement StringProperties containing functions with their Function properties equivalent, example: ${__time()}_${__threadNum()}_${__machineName()} will become a FunctionProperty of a CompoundVariable containing 3 functions
    `void` | `reverseReplace(TestElement el)` Transforms strings into variable references
    `void` | `reverseReplace(TestElement el, boolean regexMatch)` Transforms strings into variable references using regexp matching if regexMatch is `true`
    `void` | `setUserDefinedVariables(Map<String,String> variables)` Set this `ValueReplacer`'s variable map
    `void` | `undoReverseReplace(TestElement el)` Replaces ${key} by value extracted from variables if any

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

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

- - ### Constructor Detail

    - #### ValueReplacer

          public ValueReplacer()

    - #### ValueReplacer

          public ValueReplacer(TestPlan tp)

      Constructor which couples the given `TestPlan` to this by means of the user defined variables
      Parameters:
        `tp` - `TestPlan` from which we will take the user defined variables as variables map

  - ### Method Detail

    - #### setUserDefinedVariables

          public void setUserDefinedVariables(Map<String,String> variables)

      Set this `ValueReplacer`'s variable map
      Parameters:
        `variables` - Map which stores the variables

    - #### replaceValues

          public void replaceValues(TestElement el)
                             throws InvalidVariableException

      Replaces TestElement StringProperties containing functions with their Function properties equivalent, example: ${__time()}_${__threadNum()}_${__machineName()} will become a FunctionProperty of a CompoundVariable containing 3 functions
      Parameters:
        `el` - `TestElement` in which the values should be replaced
      Throws:
        `InvalidVariableException` - when transforming of the variables goes awry and the used transformer throws an `InvalidVariableException`

    - #### reverseReplace

          public void reverseReplace(TestElement el)
                              throws InvalidVariableException

      Transforms strings into variable references
      Parameters:
        `el` - `TestElement` in which the we will look for strings, that can be replaced by variable references
      Throws:
        `InvalidVariableException` - when transforming of the strings goes awry and the used transformer throws an `InvalidVariableException`

    - #### reverseReplace

          public void reverseReplace(TestElement el,
                                     boolean regexMatch)
                              throws InvalidVariableException

      Transforms strings into variable references using regexp matching if regexMatch is `true`
      Parameters:
        `el` - `TestElement` in which the we will look for strings, that can be replaced by variable references
        `regexMatch` - when `true` variable substitution will be done in regexp matching mode
      Throws:
        `InvalidVariableException` - when transforming of the strings goes awry and the used transformer throws an `InvalidVariableException`

    - #### undoReverseReplace

          public void undoReverseReplace(TestElement el)
                                  throws InvalidVariableException

      Replaces ${key} by value extracted from variables if any
      Parameters:
        `el` - `TestElement` in which values should be replaced
      Throws:
        `InvalidVariableException` - when transforming of the variables goes awry and the used transformer throws an `InvalidVariableException`

    - #### addVariable

          public void addVariable(String name,
                                  String value)

      Add a variable to this replacer's variables map
      Parameters:
        `name` - Name of the variable
        `value` - Value of the variable

    - #### addVariables

          public void addVariables(Map<String,String> vars)

      Add all the given variables to this replacer's variables map.
      Parameters:
        `vars` - A map of variable name-value pairs (String-to-String).

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