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From <Ext-Mike.Ho...@nokia.com>
Subject RE: [jxpath] setValue calling getValue
Date Mon, 11 Nov 2002 07:35:40 GMT
Dmitri, I just made the get method throw an exception so I could see the call stack ;-)  Its
not critical at all.

> -----Original Message-----
> From: ext Dmitri Plotnikov [mailto:dmitri@apache.org]
> Sent: 09. November 2002 1:28
> To: commons-dev@jakarta.apache.org
> Subject: Re: [jxpath] setValue calling getValue
> 
> 
> You are right, I looked again and sure enough I'd forgotten 
> that it does
> call getValue().  Actually, changing that would be quite a 
> challenge because
> of some internal logic of the interpretSimpleLocationPath 
> method.  The code
> is written in a generic fashion to accomodate cases like 
> Container-valued
> properties, which need to be open unconditionally.  I'll see 
> what I can do,
> but I cannot promise a quick fix.
> 
> How critical is it that the get method throw an exception?  
> Can it simply
> return null?
> 
> - Dmitri
> 
> 
> ----- Original Message -----
> From: <Ext-Mike.Hogan@nokia.com>
> To: <commons-dev@jakarta.apache.org>; <dmitri@apache.org>
> Sent: Friday, November 08, 2002 4:08 PM
> Subject: RE: [jxpath] setValue calling getValue
> 
> 
> Hi Dmitri,
> 
> I retried with the the version at the URL you sent. Different 
> stack trace,
> but the field still gets read.
> 
> java.lang.Exception
> at
> com.nokia.b2t.dna.graphmap.MockDomainObject.getStringField(Moc
> kDomainObject.
> java:51)
> at java.lang.reflect.Method.invoke(Native Method)
> at 
> org.apache.commons.jxpath.util.ValueUtils.getValue(ValueUtils.
> java:287)
> at
> org.apache.commons.jxpath.ri.model.beans.BeanPropertyPointer.g
> etBaseValue(Be
> anPropertyPointer.java:155)
> at
> org.apache.commons.jxpath.ri.model.beans.BeanPropertyPointer.g
> etNode(BeanPro
> pertyPointer.java:179)
> at
> org.apache.commons.jxpath.ri.model.beans.PropertyPointer.getVa
> luePointer(Pro
> pertyPointer.java:168)
> at
> org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.valueP
> ointer(SimpleP
> athInterpreter.java:675)
> at
> org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.interp
> retSimpleLocat
> ionPath(SimplePathInterpreter.java:114)
> at
> org.apache.commons.jxpath.ri.compiler.Path.getSingleNodePointe
> rForSteps(Path
> .java:172)
> at
> org.apache.commons.jxpath.ri.compiler.LocationPath.computeValu
> e(LocationPath
> .java:137)
> at
> org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.setVal
> ue(JXPathConte
> xtReferenceImpl.java:363)
> at
> org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.create
> PathAndSetValu
> e(JXPathContextReferenceImpl.java:354)
> at
> org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.create
> PathAndSetValu
> e(JXPathContextReferenceImpl.java:349)
> at
> com.nokia.b2t.dna.graphmap.ObjectGraphMapper.performMapping(Ob
> jectGraphMappe
> r.java:92)
> at
> com.nokia.b2t.dna.graphmap.ObjectGraphMapper.toDomainGraph(Obj
> ectGraphMapper
> .java:57)
> at
> com.nokia.b2t.dna.graphmap.ObjectGraphMapperJUnitTest.main(Obj
> ectGraphMapper
> JUnitTest.java:136)
> 
> > -----Original Message-----
> > From: ext Dmitri Plotnikov [mailto:dplotnik@yahoo.com]
> > Sent: 08. November 2002 19:53
> > To: Jakarta Commons Developers List
> > Subject: Re: [jxpath] setValue calling getValue
> >
> >
> > Mike,
> >
> > You are right, it really should not do that.
> >
> > The line numbers in the stack trace indicate that you are using a
> > pretty old version of jxpath. Could you upgrade to the 
> current version
> > and let me know if the problem persists?
> >
> > The binary download is available at
> > www.plotnix.com/jxpath/commons-jxpath.zip
> >
> > Thank you,
> >
> > - Dmitri
> >
> > --- Ext-Mike.Hogan@nokia.com wrote:
> > > Hi,
> > >
> > > When JXPath is setting a property, it first gets the
> > properties value
> > > (computeValue()).  I have an throwing an exception in the getter
> > > method in my class to show the stack trace, below.
> > >
> > > Why does JXPath read the value before setting it, and is there any
> > > way to avoid it?
> > >
> > > Thanks,
> > > Mike.
> > >
> > > java.lang.Exception: Reading field
> > > at
> > >
> > com.nokia.b2t.dna.graphmap.MockDomainObject$MockNestedDomainOb
> > ject.getStringField(MockDomainObject.java:76)
> > > at java.lang.reflect.Method.invoke(Native Method)
> > > at
> > >
> > org.apache.commons.jxpath.util.ValueUtils.getValue(ValueUtils.
> > java:287)
> > > at
> > >
> > org.apache.commons.jxpath.ri.model.beans.BeanPropertyPointer.g
> > etNodeValue(BeanPropertyPointer.java:187)
> > > at
> > >
> > org.apache.commons.jxpath.ri.model.beans.PropertyPointer.getVa
> > luePointer(PropertyPointer.java:152)
> > > at
> > >
> > org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.single
> > Step(SimplePathInterpreter.java:246)
> > > at
> > >
> > org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.interp
> > retPath(SimplePathInterpreter.java:119)
> > > at
> > >
> > org.apache.commons.jxpath.ri.compiler.Path.getSingleNodePointe
> > rForSteps(Path.java:162)
> > > at
> > >
> > org.apache.commons.jxpath.ri.compiler.LocationPath.computeValu
> > e(LocationPath.java:137)
> > > at
> > >
> > org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.setVal
> > ue(JXPathContextReferenceImpl.java:329)
> > > at
> > >
> > org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.create
> > PathAndSetValue(JXPathContextReferenceImpl.java:320)
> > > at
> > >
> > org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.create
> > PathAndSetValue(JXPathContextReferenceImpl.java:315)
> > > at
> > >
> > com.nokia.b2t.dna.graphmap.ObjectGraphMapper.performMapping(Ob
> > jectGraphMapper.java:88)
> > > at
> > >
> > com.nokia.b2t.dna.graphmap.ObjectGraphMapper.toDomainGraph(Obj
> > ectGraphMapper.java:57)
> > > at
> > >
> > com.nokia.b2t.dna.graphmap.ObjectGraphMapperJUnitTest.main(Obj
> > ectGraphMapperJUnitTest.java:122)
> > >
> > > --
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