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From M M <s.rogers.1...@gmail.com>
Subject Re: [configuration] XPathExpressionEngine - xpath syntax
Date Sat, 31 Dec 2011 09:03:56 GMT
Oliver, thank you very much!
The first hint is working perfectly.

Unfortunately the second change didn't solve the problem, I'm still 
getting null objects although I added the quotes...
I keep on doing tests, maybe I'll find the good syntax.

Thank you very much again!
Bye
MM



On 29/12/2011 21.27, Oliver Heger wrote:
> Hi, some comments below...
>
> Oliver
>
> Am 29.12.2011 11:02, schrieb M M:
>> Hi, I'm trying to use /_*Commons Configuration*_/ to parse an XML
>> configuration file and I'm having some troubles with the xpath syntax.
>> After a few tries I understood that I need to use the
>> XPathExpressionEngine, and i think that the problems I'm facing are due
>> to the xpath syntax I'm using.
>>
>> Here is the xml file:
>> ------------------------------------------------------------------------
>> <general-configuration>
>> <permissions>
>> <allowed-projects>
>> <project id="10020" key="TP1">test project 1</project>
>> <project id="10021" key="TP2">test project 2</project>
>> <project id="10022" key="TP3">test project 3</project>
>> </allowed-projects>
>>
>> <allowed-groups>
>> <group id="xyz" name="test group"/>
>> </allowed-groups>
>>
>> <allowed-users>
>> <user id="zxy" name="test user"/>
>> </allowed-users>
>> </permissions>
>>
>> <kpi-definition>
>> <project id="10020" key="DP">
>> <issue-type id="1" name="Bug">
>> <kpi id="1" name="t0 - t1" days="0" hours="0" minutes="10">
>> <transition id="1" name="a">1</transition>
>> <transition id="2" name="b">2</transition>
>> </kpi>
>> <kpi id="2" name="t1 - t2" days="0" hours="1" minutes="0">
>> <transition id="3" name="c">1</transition>
>> <transition id="4" name="d">2</transition>
>> </kpi>
>> </issue-type>
>>
>> <issue-type id="3" name="Task">
>>
>> <kpi id="1" name="t0 - t1" days="0" hours="0" minutes="10">
>> <transition id="5" name="e"></transition>
>> <transition id="6" name="f"></transition>
>> </kpi>
>>
>> <kpi id="2" name="t1 - t2" days="0" hours="1" minutes="0">
>> <transition id="7" name="g"></transition>
>> <transition id="8" name="h"></transition>
>> </kpi>
>> </issue-type>
>> </project>
>> </kpi-definition>
>> </general-configuration>
>> ------------------------------------------------------------------------
>>
>> And here is the code I wrote to try to understand how to get what i want
>> using the XPathExpressionEngine
>> ------------------------------------------------------------------------
>> private XMLConfiguration configurationFile;
>>
>> configurationFile = new XMLConfiguration(/"kpi_configuration.xml"/);
>> configurationFile.setExpressionEngine(new XPathExpressionEngine());
>>
>>
>> DefaultExpressionEngine defaultEngine = new DefaultExpressionEngine();
>> defaultEngine.setPropertyDelimiter(/"/"/);
>> configurationFile.setExpressionEngine(defaultEngine);
>>
>> *// using the default expression engine i get what i want, a list of the
>> // "id" attributes of the project tag (10020,10021,10022)*
>> List<String> testList001 =
>> configurationFile.getList(/"permissions/allowed-projects/project[@id]"/); 
>>
>> for (Iterator<String> iterator = testList001.iterator();
>> iterator.hasNext();)
>> {
>> System.out.println(iterator.next());
>> }
>>
>> configurationFile.setExpressionEngine(new XPathExpressionEngine());
>> *// using the xpath expression engine, and giving exactly the same path
>> to the getList method
>> // i get a completely different result! the list is made of the text
>> content of the tag
>> // (test project 1, test project 2, test project 3)*
>> List<String> testList002 =
>> configurationFile.getList(/"permissions/allowed-projects/project[@id]"/); 
>>
>> for (Iterator<String> iterator = testList002.iterator();
>> iterator.hasNext();)
>> {
>> System.out.println(iterator.next());
>> }
>
> Try the key "permissions/allowed-projects/project/@id"; the square 
> brackets are not needed for accessing attributes.
>
>>
>> *// here I tried to use the xpath syntax [@attribute=value] to get into
>> a specific branch of the xml tree
>> // the expected result was at least a list of values, instead i get null
>> object*
>> List<String> testList003 =
>> configurationFile.getList(/"kpi-definition/project[@id=10020]/issue-type[@id=1]/transition"/);

>>
>>
>> for (Iterator<String> iterator = testList003.iterator();
>> iterator.hasNext();)
>> {
>> System.out.println(iterator.next());
>> }
>
> For this and the following example it may be necessary to quote the 
> values because they are strings, e.g.
> "kpi-definition/project[@id='10020']/issue-type[@id='1']/transition"
>
>>
>> *// here I tried to use the xpath syntax [@attribute=value] to get into
>> a specific branch of the xml tree
>> // the expected result was a single value instead i got a null object*
>> String testValue001 =
>> configurationFile.getString(/"kpi-definition/project[@id=10020]/issue-type[@id=1]/transition[@name=a]"/);

>>
>>
>> System.out.println(testValue001);
>>
>> Many, many thanks in advance to everyone who can help me!
>> I really can't work it out (... and I have to :) ... )
>> MM
>>
>>
>
>
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