[T5] ?. operator for null-safe graph traversal
customer?.address?.street I've borrowed some syntax from Groovy to handle this case; the ?. operator returns null if the LHS is null, otherwise is traverses into the property on the RHS. On 3/6/07, Angelo Luis [EMAIL PROTECTED] wrote: No no no... How can have a null handler now??? If a have a customer - address - street in a text component, for example custumer.address.street and i dont instanciate a address, a NullPointerException is throw. With a ognl null handler, if the address is null he creates one , like Webwork... i dont need to instanciate all object graph to use in a page... i will have this same problem in t5? On 3/5/07, Howard Lewis Ship [EMAIL PROTECTED] wrote: Two problems here: 1) Not well formed XML. That inside the test attribute isn't allow. Use lt; 2) OGNL isn't supported in T5. For anything more complicated than a property access, you do the work in Java code as a synthetic property. On 3/5/07, Davor Hrg [EMAIL PROTECTED] wrote: Hi, maybe this was reported and solved but here it goes ... I've tried the tapestry tutorial and it was very nice and easy. I've made few mistakes but error reporting is great so it was fixed quickly. the problem occured when I tried to add some of the proposed changes to the app.. just to test the expressions I added: t:comp type=If test=ognl:index5 but I get the error Failure parsing template context:WEB-INF/Guess.html: The value of attribute test associated with an element type t:comp must not contain the '' character. Am I doing it wrong, or it's just a bug to be fixed later Davor Hrg -- Howard M. Lewis Ship TWD Consulting, Inc. Independent J2EE / Open-Source Java Consultant Creator and PMC Chair, Apache Tapestry Creator, Apache HiveMind Professional Tapestry training, mentoring, support and project work. http://howardlewisship.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Howard M. Lewis Ship TWD Consulting, Inc. Independent J2EE / Open-Source Java Consultant Creator and PMC Chair, Apache Tapestry Creator, Apache HiveMind Professional Tapestry training, mentoring, support and project work. http://howardlewisship.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [T5] ?. operator for null-safe graph traversal
Nice. I like that and the 0... that you've added. Why can't we replicate you for work on OGNL ? =p On 3/6/07, Howard Lewis Ship [EMAIL PROTECTED] wrote: customer?.address?.street I've borrowed some syntax from Groovy to handle this case; the ?. operator returns null if the LHS is null, otherwise is traverses into the property on the RHS. On 3/6/07, Angelo Luis [EMAIL PROTECTED] wrote: No no no... How can have a null handler now??? If a have a customer - address - street in a text component, for example custumer.address.street and i dont instanciate a address, a NullPointerException is throw. With a ognl null handler, if the address is null he creates one , like Webwork... i dont need to instanciate all object graph to use in a page... i will have this same problem in t5? On 3/5/07, Howard Lewis Ship [EMAIL PROTECTED] wrote: Two problems here: 1) Not well formed XML. That inside the test attribute isn't allow. Use lt; 2) OGNL isn't supported in T5. For anything more complicated than a property access, you do the work in Java code as a synthetic property. On 3/5/07, Davor Hrg [EMAIL PROTECTED] wrote: Hi, maybe this was reported and solved but here it goes ... I've tried the tapestry tutorial and it was very nice and easy. I've made few mistakes but error reporting is great so it was fixed quickly. the problem occured when I tried to add some of the proposed changes to the app.. just to test the expressions I added: t:comp type=If test=ognl:index5 but I get the error Failure parsing template context:WEB-INF/Guess.html: The value of attribute test associated with an element type t:comp must not contain the '' character. Am I doing it wrong, or it's just a bug to be fixed later Davor Hrg -- Howard M. Lewis Ship TWD Consulting, Inc. Independent J2EE / Open-Source Java Consultant Creator and PMC Chair, Apache Tapestry Creator, Apache HiveMind Professional Tapestry training, mentoring, support and project work. http://howardlewisship.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Howard M. Lewis Ship TWD Consulting, Inc. Independent J2EE / Open-Source Java Consultant Creator and PMC Chair, Apache Tapestry Creator, Apache HiveMind Professional Tapestry training, mentoring, support and project work. http://howardlewisship.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Jesse Kuhnert Tapestry/Dojo team member/developer Open source based consulting work centered around dojo/tapestry/tacos/hivemind. http://blog.opencomponentry.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [T5] ?. operator for null-safe graph traversal
It is definately a twisty path, before long I'll have reproduced all of OGNL. It might be fun to support low..high syntax for properties rather than constants, but that's getting to be as far as I want to take it. Do the heavy lifting in Java (or Groovy) code. On 3/6/07, Jesse Kuhnert [EMAIL PROTECTED] wrote: Nice. I like that and the 0... that you've added. Why can't we replicate you for work on OGNL ? =p On 3/6/07, Howard Lewis Ship [EMAIL PROTECTED] wrote: customer?.address?.street I've borrowed some syntax from Groovy to handle this case; the ?. operator returns null if the LHS is null, otherwise is traverses into the property on the RHS. On 3/6/07, Angelo Luis [EMAIL PROTECTED] wrote: No no no... How can have a null handler now??? If a have a customer - address - street in a text component, for example custumer.address.street and i dont instanciate a address, a NullPointerException is throw. With a ognl null handler, if the address is null he creates one , like Webwork... i dont need to instanciate all object graph to use in a page... i will have this same problem in t5? On 3/5/07, Howard Lewis Ship [EMAIL PROTECTED] wrote: Two problems here: 1) Not well formed XML. That inside the test attribute isn't allow. Use lt; 2) OGNL isn't supported in T5. For anything more complicated than a property access, you do the work in Java code as a synthetic property. On 3/5/07, Davor Hrg [EMAIL PROTECTED] wrote: Hi, maybe this was reported and solved but here it goes ... I've tried the tapestry tutorial and it was very nice and easy. I've made few mistakes but error reporting is great so it was fixed quickly. the problem occured when I tried to add some of the proposed changes to the app.. just to test the expressions I added: t:comp type=If test=ognl:index5 but I get the error Failure parsing template context:WEB-INF/Guess.html: The value of attribute test associated with an element type t:comp must not contain the '' character. Am I doing it wrong, or it's just a bug to be fixed later Davor Hrg -- Howard M. Lewis Ship TWD Consulting, Inc. Independent J2EE / Open-Source Java Consultant Creator and PMC Chair, Apache Tapestry Creator, Apache HiveMind Professional Tapestry training, mentoring, support and project work. http://howardlewisship.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Howard M. Lewis Ship TWD Consulting, Inc. Independent J2EE / Open-Source Java Consultant Creator and PMC Chair, Apache Tapestry Creator, Apache HiveMind Professional Tapestry training, mentoring, support and project work. http://howardlewisship.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Jesse Kuhnert Tapestry/Dojo team member/developer Open source based consulting work centered around dojo/tapestry/tacos/hivemind. http://blog.opencomponentry.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Howard M. Lewis Ship TWD Consulting, Inc. Independent J2EE / Open-Source Java Consultant Creator and PMC Chair, Apache Tapestry Creator, Apache HiveMind Professional Tapestry training, mentoring, support and project work. http://howardlewisship.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [T5] ?. operator for null-safe graph traversal
Yeah...Thinking about it more now I realize that you don't really have a choice. I'm still wondering how much mileage I'm liable to get out of all of these OGNL changes if there is a better alternative..(ie if groovy works just as well for property set/get operations ? ...) I may send out an email to a few people to explore around first. There are so many cool things to play with I don't want to waste my time if there is an obvious alternative. (like maybe T5 itself, though I'm even more wary of that right now - mostly because I think I'd be getting in the way / distracting when some portions are still forming...too many cooks can destroy a meal / er something... ;) ) On 3/6/07, Howard Lewis Ship [EMAIL PROTECTED] wrote: It is definately a twisty path, before long I'll have reproduced all of OGNL. It might be fun to support low..high syntax for properties rather than constants, but that's getting to be as far as I want to take it. Do the heavy lifting in Java (or Groovy) code. On 3/6/07, Jesse Kuhnert [EMAIL PROTECTED] wrote: Nice. I like that and the 0... that you've added. Why can't we replicate you for work on OGNL ? =p On 3/6/07, Howard Lewis Ship [EMAIL PROTECTED] wrote: customer?.address?.street I've borrowed some syntax from Groovy to handle this case; the ?. operator returns null if the LHS is null, otherwise is traverses into the property on the RHS. On 3/6/07, Angelo Luis [EMAIL PROTECTED] wrote: No no no... How can have a null handler now??? If a have a customer - address - street in a text component, for example custumer.address.street and i dont instanciate a address, a NullPointerException is throw. With a ognl null handler, if the address is null he creates one , like Webwork... i dont need to instanciate all object graph to use in a page... i will have this same problem in t5? On 3/5/07, Howard Lewis Ship [EMAIL PROTECTED] wrote: Two problems here: 1) Not well formed XML. That inside the test attribute isn't allow. Use lt; 2) OGNL isn't supported in T5. For anything more complicated than a property access, you do the work in Java code as a synthetic property. On 3/5/07, Davor Hrg [EMAIL PROTECTED] wrote: Hi, maybe this was reported and solved but here it goes ... I've tried the tapestry tutorial and it was very nice and easy. I've made few mistakes but error reporting is great so it was fixed quickly. the problem occured when I tried to add some of the proposed changes to the app.. just to test the expressions I added: t:comp type=If test=ognl:index5 but I get the error Failure parsing template context:WEB-INF/Guess.html: The value of attribute test associated with an element type t:comp must not contain the '' character. Am I doing it wrong, or it's just a bug to be fixed later Davor Hrg -- Howard M. Lewis Ship TWD Consulting, Inc. Independent J2EE / Open-Source Java Consultant Creator and PMC Chair, Apache Tapestry Creator, Apache HiveMind Professional Tapestry training, mentoring, support and project work. http://howardlewisship.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Howard M. Lewis Ship TWD Consulting, Inc. Independent J2EE / Open-Source Java Consultant Creator and PMC Chair, Apache Tapestry Creator, Apache HiveMind Professional Tapestry training, mentoring, support and project work. http://howardlewisship.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Jesse Kuhnert Tapestry/Dojo team member/developer Open source based consulting work centered around dojo/tapestry/tacos/hivemind. http://blog.opencomponentry.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Howard M. Lewis Ship TWD Consulting, Inc. Independent J2EE / Open-Source Java Consultant Creator and PMC Chair, Apache Tapestry Creator, Apache HiveMind Professional Tapestry training, mentoring, support and project work. http://howardlewisship.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Jesse Kuhnert Tapestry/Dojo team member/developer Open source based consulting work centered around dojo/tapestry/tacos/hivemind. http://blog.opencomponentry.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional
