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From Oliver Heger <oliver.he...@oliver-heger.de>
Subject Re: [configuration] XPathExpressionEngine - xpath syntax
Date Thu, 29 Dec 2011 20:27:33 GMT
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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