[Webtest] stupid webtest question #426. Can I store a constant for later use?

[Marc Guillemot]

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Hi Bill,

attached is my custom step that extends the com.canoo.webtest.steps.StoreXPath 
to allow xpath expression to eval to something else as a node.

In my test cases it works as expected but I can't 100% certify that it evaluates 
like the Canoo version for nodes and attributes as I'm not sure of the exact way 
the dom methods work.

Marc.


Bill Milbratz wrote:
>>In our current project we have the very same issue.
>>You need to find an xpath expression that evaluates to your 'constant', 
> eg. xpath="concat(''MYCONSTANT,'')"
>  
> This sounded good, but such a concat  (and all combinations I tried) 
> gave me the following errors. Any suggestions?
> e.g. these xpath's:
> xpath="concat(''MYCONSTANT','')"
> xpath="concat(//title,'MYCONSTANT')"
>  
> Yielded these such errors:
> 
>  [testSpec] org.dom4j.XPathException: Exception occurred evaluting 
> XPath: The result of the
> XPath expression is not a Node. It was: a of type: java.lang.String. You 
> might want to use a
>  different method such as selectObject() to evaluate this XPath expression
>  [testSpec]     at 
> org.dom4j.xpath.DefaultXPath.selectSingleNode(DefaultXPath.java:163)
>  [testSpec]     at 
> org.dom4j.tree.AbstractNode.selectSingleNode(AbstractNode.java:188)
>  [testSpec]     at 
> com.canoo.webtest.steps.StoreXPath.getXPath(StoreXPath.java:83)
>  [testSpec]     at 
> com.canoo.webtest.steps.StoreXPath.doExecute(StoreXPath.java:58)
>  [testSpec]     at com.canoo.webtest.steps.Step.execute(Step.java:56)
>  [testSpec]     at 
> com.canoo.webtest.engine.Engine.executeSteps(Engine.java:32)
>  [testSpec]     at 
> com.canoo.webtest.ant.TestSpecificationTask.execute(TestSpecificationTask
>  
> thanks,
>  
> bill m
> 
>      


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package de.internetzky.webtests.extension;

import java.util.List;

import org.dom4j.Document;
import org.dom4j.tree.AbstractAttribute;

import com.canoo.webtest.engine.StepFailedException;

/**
 * Improved {@link #getXPath} to allow evaluation of expressions  
 * @author Marc Guillemot
 * @version $Revision: 1.2 $ $Date: 2003/08/25 14:30:49 $ Last change by $Author: cvs-marc $
 */
public class StoreXPath extends com.canoo.webtest.steps.StoreXPath
{

	/**
	 * same as {@link com.canoo.webtest.steps.StoreXPath#getXPath} plus:
	 * <ul>
	 * <li>xpath can be get something else as a node / node list</li>
	 * </ul>
	 */
	protected String getXPath(Document document)
	{

			Object o = document.selectObject(getXpath());
			if (o == null)
			{
				throw new StepFailedException(
					"No match for xpath expression <" + getXpath() + ">",
					this);
			}

			// if list with single element, then we take the element
			if (o instanceof List && ((List) o).size() == 1)
			{
				o = ((List) o).get(0);
			}

			// for an attribute, take the value
			if (o instanceof AbstractAttribute)
			{
				o = ((AbstractAttribute) o).getValue();
			}
			return o.toString();
	}
}
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