Apache JMeter

org.apache.jmeter.functions
Class XPath

java.lang.Object
  extended by org.apache.jmeter.functions.AbstractFunction
      extended by org.apache.jmeter.functions.XPath
All Implemented Interfaces:
Function

public class XPath
extends AbstractFunction

The function represented by this class allows data to be read from XML files. Syntax is similar to the CVSRead function. The function allows the test to line-thru the nodes in the XML file - one node per each test. E.g. inserting the following in the test scripts : ${_XPath(c:/BOF/abcd.xml,/xpath/)} // match the (first) node ${_XPath(c:/BOF/abcd.xml,/xpath/)} // Go to next match of '/xpath/' expression NOTE: A single instance of each different file/expression combination is opened and used for all threads.

Since:
2.0.3

Constructor Summary
XPath()
           
 
Method Summary
 String execute(SampleResult previousResult, Sampler currentSampler)
           N.B. execute() should be synchronized if function is operating with non-thread-safe objects (e.g. operates with files).
 List<String> getArgumentDesc()
          Return a list of strings briefly describing each parameter your function takes.
 String getReferenceKey()
          Return the name of your function.
 void setParameters(Collection<CompoundVariable> parameters)
          Note: This is always called even if no parameters are provided (versions of JMeter after 2.3.1)
 
Methods inherited from class org.apache.jmeter.functions.AbstractFunction
checkMinParameterCount, checkParameterCount, checkParameterCount, execute, getVariables
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

XPath

public XPath()
Method Detail

execute

public String execute(SampleResult previousResult,
                      Sampler currentSampler)
               throws InvalidVariableException

N.B. execute() should be synchronized if function is operating with non-thread-safe objects (e.g. operates with files).

JMeter ensures setParameters() happens-before execute(): setParameters is executed in main thread, and worker threads are started after that.

Specified by:
execute in interface Function
Specified by:
execute in class AbstractFunction
Parameters:
previousResult - The previous SampleResult
currentSampler - The current Sampler
Returns:
The replacement value, which was generated by the function
Throws:
InvalidVariableException - - when the variables for the function call can't be evaluated
See Also:
Function.execute(SampleResult, Sampler)

getArgumentDesc

public List<String> getArgumentDesc()
Return a list of strings briefly describing each parameter your function takes. Please use JMeterUtils.getResString(resource_name) to grab a resource string. Otherwise, your help text will be difficult to internationalize. This list is not optional. If you don't wish to write help, you must at least return a List containing the correct number of blank strings, one for each argument.

Returns:
List with brief descriptions for each parameter the function takes

getReferenceKey

public String getReferenceKey()
Return the name of your function. Convention is to prepend "__" to the name (ie "__regexFunction")

Specified by:
getReferenceKey in interface Function
Specified by:
getReferenceKey in class AbstractFunction
Returns:
The name of the funtion
See Also:
Function.getReferenceKey()

setParameters

public void setParameters(Collection<CompoundVariable> parameters)
                   throws InvalidVariableException
Note: This is always called even if no parameters are provided (versions of JMeter after 2.3.1)

Specified by:
setParameters in interface Function
Specified by:
setParameters in class AbstractFunction
Parameters:
parameters - The parameters for the function call
Throws:
InvalidVariableException - - when the variables for the function call can't be evaluated
See Also:
Function.setParameters(Collection)

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