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Posted to user@commons.apache.org by Pascal Ravot <pa...@mcc-soft.com> on 2008/06/05 09:26:15 UTC
SCXML - XPATH
Hello,
I'm a perfect newbie to sxcml, so i'm probably asking stupid questions !
I'm trying to get access to the content of a datamodel from within the
scxml document and a custom action :
Here is the dummy state machine:
<scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0"
xmlns:mc="http://com.mccsoft.scxml/action" initialstate="start">
<!-- Defining global data -->
<datamodel>
<data name="timeout" expr="1" />
<data name="counter" expr="1" />
<data name="poolconfiguration">
<foo>
<dir>toto</dir>
<freq>1</freq>
</foo>
</data>
</datamodel>
<!-- State machine starts here -->
<state id="start">
<onentry>
<log
expr="Data(poolconfiguration, 'foo/dir')"
/>
</onentry>
<transition target="now_waiting" />
</state>
<state id="now_waiting">
<onentry>
<log expr="Counter is now counter" />
</onentry>
<onentry>
<mc:wait timeoutName="timeout" conf="poolconfiguration"/>
<assign name="counter" expr="counter +1" />
<log
expr="'Timeout is ' + timeout + ' Counter is ' +
counter " />
</onentry>
<transition target="now_waiting" />
</state>
</scxml>
Regarding execution environment everything is copied from samples using
Jexl :
exec = new SCXMLExecutor(new JexlEvaluator(),
new SimpleDispatcher(), new SimpleErrorReporter());
exec.setStateMachine(scxml);
exec.setRootContext(new JexlContext());
I've got a custom action <mc:wait ...> that get the name of the data
entry to inspect...
Within the execute of the action i'm trying to do roughly but with java
the equivalent of
<log expr="Data(poolconfiguration, 'foo/dir')" />
-->
scInstance.getEvaluator().eval(
scInstance.getRootContext(), "Data(" + conf +
",'foo/dir')");
My objective is to be able to access sub elements of a defined data (in
this case poolconfiguration/foo/dir) of a top level datamodel.
and that either by scxml script or within custom action.
Unfortunately, none of those evaluation is returning the expected "toto".
I got in the log :
1922 [main] DEBUG org.apache.commons.jexl.ExpressionFactory - Parsing
expression: _builtin.data(_ALL_NAMESPACES, poolconfiguration, 'foo/dir');
4500 [main] WARN org.apache.commons.scxml.Builtin - Data(): No nodes
matching the XPath expression "foo/dir", returning null
or
126125 [main] DEBUG org.apache.commons.scxml.Builtin - Turning off
namespaced XPath evaluation since no namespace information is available
for path: foo/dir
126140 [main] WARN org.apache.commons.scxml.Builtin - Data(): No nodes
matching the XPath expression "foo/dir", returning null
(for the custom action).
The strange point is that, after debugging this sample, it appeared that
the poolconfiguration node is correctly extracted by the Data
expression. I mean the datanode found
in the _builtin seems ok (with childs, sieblings...),
but this piece of code (org.apache.commons.scxml.Builtin.java):
result = XPathAPI.selectNodeList(dataNode, path);
returns an empty list.
It is most obvious (to everybody except me) that i've probably spelled
the XPATH in an incorrect way,
but i've tried may path without success ( '//dir', '/data/foo/dir',
'data/foo/dir'...)
So any help or idea is welcomed !!!!
By advance thanks.
P. Ravot.
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Re: [SCXML] - XPATH
Posted by Pascal Ravot <pa...@mcc-soft.com>.
Excellent
Many Thks Lawrence
Yau Lawrence wrote:
> Hello Pascal,
> The simplest way to correct the problem is to change your datamodel definition to use an unnamed namespace for your poolconfiguration XML tree:
>
> ...
> <data name="poolconfiguration">
> <foo xmlns=""> <!-- override SCXML namespace -->
> <dir>toto</dir>
> <freq>1</freq>
> </foo>
> </data>
> ...
>
> Then your xpath expression will work. I tested your SCXML document just to be sure.
>
> Hope this helps,
> Lawrence
>
>
> -----Original Message-----
> From: Pascal Ravot [mailto:pascal.ravot@mcc-soft.com]
> Sent: 05 June 2008 9:26
> To: user@commons.apache.org
> Subject: SCXML - XPATH
>
> Hello,
> I'm a perfect newbie to sxcml, so i'm probably asking stupid questions !
>
> I'm trying to get access to the content of a datamodel from within the scxml document and a custom action :
> Here is the dummy state machine:
>
> <scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0"
> xmlns:mc="http://com.mccsoft.scxml/action" initialstate="start">
> <!-- Defining global data -->
> <datamodel>
> <data name="timeout" expr="1" />
> <data name="counter" expr="1" />
> <data name="poolconfiguration">
> <foo>
> <dir>toto</dir>
> <freq>1</freq>
> </foo>
> </data>
> </datamodel>
> <!-- State machine starts here -->
> <state id="start">
> <onentry>
> <log
> expr="Data(poolconfiguration, 'foo/dir')"
> />
> </onentry>
> <transition target="now_waiting" />
> </state>
> <state id="now_waiting">
> <onentry>
> <log expr="Counter is now counter" />
> </onentry>
> <onentry>
> <mc:wait timeoutName="timeout" conf="poolconfiguration"/>
> <assign name="counter" expr="counter +1" />
> <log
> expr="'Timeout is ' + timeout + ' Counter is ' + counter " />
> </onentry>
> <transition target="now_waiting" />
> </state>
>
> </scxml>
>
> Regarding execution environment everything is copied from samples using Jexl :
>
> exec = new SCXMLExecutor(new JexlEvaluator(),
> new SimpleDispatcher(), new SimpleErrorReporter());
> exec.setStateMachine(scxml);
> exec.setRootContext(new JexlContext());
>
> I've got a custom action <mc:wait ...> that get the name of the data entry to inspect...
> Within the execute of the action i'm trying to do roughly but with java the equivalent of <log expr="Data(poolconfiguration, 'foo/dir')" />
>
> -->
> scInstance.getEvaluator().eval(
> scInstance.getRootContext(), "Data(" + conf + ",'foo/dir')");
>
>
> My objective is to be able to access sub elements of a defined data (in this case poolconfiguration/foo/dir) of a top level datamodel.
> and that either by scxml script or within custom action.
>
> Unfortunately, none of those evaluation is returning the expected "toto".
>
> I got in the log :
> 1922 [main] DEBUG org.apache.commons.jexl.ExpressionFactory - Parsing
> expression: _builtin.data(_ALL_NAMESPACES, poolconfiguration, 'foo/dir'); 4500 [main] WARN org.apache.commons.scxml.Builtin - Data(): No nodes matching the XPath expression "foo/dir", returning null
>
> or
> 126125 [main] DEBUG org.apache.commons.scxml.Builtin - Turning off namespaced XPath evaluation since no namespace information is available for path: foo/dir 126140 [main] WARN org.apache.commons.scxml.Builtin - Data(): No nodes matching the XPath expression "foo/dir", returning null
>
> (for the custom action).
>
> The strange point is that, after debugging this sample, it appeared that the poolconfiguration node is correctly extracted by the Data expression. I mean the datanode found in the _builtin seems ok (with childs, sieblings...), but this piece of code (org.apache.commons.scxml.Builtin.java):
> result = XPathAPI.selectNodeList(dataNode, path); returns an empty list.
>
> It is most obvious (to everybody except me) that i've probably spelled the XPATH in an incorrect way, but i've tried may path without success ( '//dir', '/data/foo/dir',
> 'data/foo/dir'...)
>
> So any help or idea is welcomed !!!!
>
> By advance thanks.
>
> P. Ravot.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> For additional commands, e-mail: user-help@commons.apache.org
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> For additional commands, e-mail: user-help@commons.apache.org
>
>
>
>
--
*Pascal Ravot*
/Partner Manager/
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*M*essage *C*ommunication *C*onseil *SAS*
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Paris F-75011 France
Phone : 33 1 44 93 24 24
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Str. Corneliu Coposcu nr 3, bl 101
email : pascal.ravot@mcc-soft.com <ma...@mcc-soft.com>
Web : http://www.mcc-soft.com <http://www.mcc-soft.com/>
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RE: [SCXML] - XPATH
Posted by Yau Lawrence <La...@nc3a.nato.int>.
Hello Pascal,
The simplest way to correct the problem is to change your datamodel definition to use an unnamed namespace for your poolconfiguration XML tree:
...
<data name="poolconfiguration">
<foo xmlns=""> <!-- override SCXML namespace -->
<dir>toto</dir>
<freq>1</freq>
</foo>
</data>
...
Then your xpath expression will work. I tested your SCXML document just to be sure.
Hope this helps,
Lawrence
-----Original Message-----
From: Pascal Ravot [mailto:pascal.ravot@mcc-soft.com]
Sent: 05 June 2008 9:26
To: user@commons.apache.org
Subject: SCXML - XPATH
Hello,
I'm a perfect newbie to sxcml, so i'm probably asking stupid questions !
I'm trying to get access to the content of a datamodel from within the scxml document and a custom action :
Here is the dummy state machine:
<scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0"
xmlns:mc="http://com.mccsoft.scxml/action" initialstate="start">
<!-- Defining global data -->
<datamodel>
<data name="timeout" expr="1" />
<data name="counter" expr="1" />
<data name="poolconfiguration">
<foo>
<dir>toto</dir>
<freq>1</freq>
</foo>
</data>
</datamodel>
<!-- State machine starts here -->
<state id="start">
<onentry>
<log
expr="Data(poolconfiguration, 'foo/dir')"
/>
</onentry>
<transition target="now_waiting" />
</state>
<state id="now_waiting">
<onentry>
<log expr="Counter is now counter" />
</onentry>
<onentry>
<mc:wait timeoutName="timeout" conf="poolconfiguration"/>
<assign name="counter" expr="counter +1" />
<log
expr="'Timeout is ' + timeout + ' Counter is ' + counter " />
</onentry>
<transition target="now_waiting" />
</state>
</scxml>
Regarding execution environment everything is copied from samples using Jexl :
exec = new SCXMLExecutor(new JexlEvaluator(),
new SimpleDispatcher(), new SimpleErrorReporter());
exec.setStateMachine(scxml);
exec.setRootContext(new JexlContext());
I've got a custom action <mc:wait ...> that get the name of the data entry to inspect...
Within the execute of the action i'm trying to do roughly but with java the equivalent of <log expr="Data(poolconfiguration, 'foo/dir')" />
-->
scInstance.getEvaluator().eval(
scInstance.getRootContext(), "Data(" + conf + ",'foo/dir')");
My objective is to be able to access sub elements of a defined data (in this case poolconfiguration/foo/dir) of a top level datamodel.
and that either by scxml script or within custom action.
Unfortunately, none of those evaluation is returning the expected "toto".
I got in the log :
1922 [main] DEBUG org.apache.commons.jexl.ExpressionFactory - Parsing
expression: _builtin.data(_ALL_NAMESPACES, poolconfiguration, 'foo/dir'); 4500 [main] WARN org.apache.commons.scxml.Builtin - Data(): No nodes matching the XPath expression "foo/dir", returning null
or
126125 [main] DEBUG org.apache.commons.scxml.Builtin - Turning off namespaced XPath evaluation since no namespace information is available for path: foo/dir 126140 [main] WARN org.apache.commons.scxml.Builtin - Data(): No nodes matching the XPath expression "foo/dir", returning null
(for the custom action).
The strange point is that, after debugging this sample, it appeared that the poolconfiguration node is correctly extracted by the Data expression. I mean the datanode found in the _builtin seems ok (with childs, sieblings...), but this piece of code (org.apache.commons.scxml.Builtin.java):
result = XPathAPI.selectNodeList(dataNode, path); returns an empty list.
It is most obvious (to everybody except me) that i've probably spelled the XPATH in an incorrect way, but i've tried may path without success ( '//dir', '/data/foo/dir',
'data/foo/dir'...)
So any help or idea is welcomed !!!!
By advance thanks.
P. Ravot.
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
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