RE: [EL] Docs ?
Michael Rasmussen wrote on Thursday, June 30, 2005 10:47 PM: Sorry, it is not my intention to split hairs here. I am just saying that if you want to support the same syntax as the JSTL-EL you will nto be able to do it with JEXL. You are however more likely to be able to continue to support a JSTL syntax, as it evolves, by using the taglibs project. JEXL will not accomplish this. The original posters requirement was to cater to users who were familiar with the JSTL syntax. Your point about JSTL-EL not existing outside the Servlet container is well taken, and it deserves to be made clear. So thank you. Michael Thanks to both of you for clarifying this. - Jörg - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: [EL] Docs ?
Right, to go back to the EL. commons-el supports EL as defined in the original JSTL spec and the JSP 2.0 specifications. For you to claim to support EL you are going to have to reference either one of those specs, I'm fairly certain that EL was never defined as anything that could live outside of either of these J2EE-specific specifications. So, in other words, you couldn't claim to support EL outside of a servlet environment, but you could claim to support something similar to EL, and that would be JEXL. Tim O'Brien [EMAIL PROTECTED] -Original Message- From: Jörg Schaible [mailto:[EMAIL PROTECTED] Sent: Monday, June 27, 2005 2:23 AM To: Jakarta Commons Users List Subject: RE: [EL] Docs ? Hi Tim, Tim O'Brien wrote on Sunday, June 26, 2005 1:05 AM: EL is meant to be used in a JSP 2.0 environment. That's what I wanted to find out for commons-el, wheter it can be used standalone or not. I write a component, that others with EL experiance will have to use. You can get everything you need form Commons JEXL. [snip] Well, may I cite from the JEXl homepage: cite It must be noted that JEXL is not a compatibile implementation of EL as defined in JSTL 1.1 (JSR-052) or JSP 2.0 (JSR-152). For a compatible implementation of these specifications, see the Commons EL project. /cite If I release a component that claims to have EL support, any problem with it will cause maintenance effort on my side. - Jörg - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: [EL] Docs ?
So, in other words, you couldn't claim to support EL outside of a = servlet environment, but you could claim to support something similar to = EL, and that would be JEXL. That's not really true. I use the JSTL EL outside of servlets all the time. If you get the standard.jar from the jakarta-taglibs project you will find the ELEvaluator which uses JSTL style expressions. the fully qualified name in the jar is org.apache.taglibs.standard.lang.jstl.ELEvaluator If you want to claim to support EL you should get that jar. It may use commons EL as its underlying implementation, but i don't have a commons-el jar on my classpath, so I don't think it has any dependencies. Some of the taglibs guys could answer that better than I could. Michael - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: [EL] Docs ?
-Original Message- From: Michael Rasmussen [mailto:[EMAIL PROTECTED] Sent: Thursday, June 30, 2005 3:13 PM To: commons-user@jakarta.apache.org Subject: RE: [EL] Docs ? So, in other words, you couldn't claim to support EL outside of a = servlet environment, but you could claim to support something similar to = EL, and that would be JEXL. That's not really true. I use the JSTL EL outside of servlets all the time. If you get the standard.jar from the jakarta-taglibs project you will find the ELEvaluator which uses JSTL style expressions. the fully qualified name in the jar is org.apache.taglibs.standard.lang.jstl.ELEvaluator If you want to claim to support EL you should get that jar. It may use commons EL as its underlying implementation, but i don't have a commons-el jar on my classpath, so I don't think it has any dependencies. Some of the taglibs guys could answer that better than I could. Yes, but more word mincing, you can't claim to support EL outside of a JSTL or JSP context because it is an intimate part of those two specifications. As of standard-1.1 I believe reliance of PageContext was removed from ELEvaluator so you can include a JSP taglibrary in your path if you want to provide support for EL. (But, really you are just providing support for EL-like syntax.) BTW, this is another one of those terrible situations where one codebase seems to have been split long ago, one incarnation lives in commons-el and another in standard. Tim - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [EL] Docs ?
Sorry, it is not my intention to split hairs here. I am just saying that if you want to support the same syntax as the JSTL-EL you will nto be able to do it with JEXL. You are however more likely to be able to continue to support a JSTL syntax, as it evolves, by using the taglibs project. JEXL will not accomplish this. The original posters requirement was to cater to users who were familiar with the JSTL syntax. Your point about JSTL-EL not existing outside the Servlet container is well taken, and it deserves to be made clear. So thank you. Michael On 6/30/05, Tim O'Brien [EMAIL PROTECTED] wrote: -Original Message- From: Michael Rasmussen [mailto:[EMAIL PROTECTED] Sent: Thursday, June 30, 2005 3:13 PM To: commons-user@jakarta.apache.org Subject: RE: [EL] Docs ? So, in other words, you couldn't claim to support EL outside of a = servlet environment, but you could claim to support something similar to = EL, and that would be JEXL. That's not really true. I use the JSTL EL outside of servlets all the time. If you get the standard.jar from the jakarta-taglibs project you will find the ELEvaluator which uses JSTL style expressions. the fully qualified name in the jar is org.apache.taglibs.standard.lang.jstl.ELEvaluator If you want to claim to support EL you should get that jar. It may use commons EL as its underlying implementation, but i don't have a commons-el jar on my classpath, so I don't think it has any dependencies. Some of the taglibs guys could answer that better than I could. Yes, but more word mincing, you can't claim to support EL outside of a JSTL or JSP context because it is an intimate part of those two specifications. As of standard-1.1 I believe reliance of PageContext was removed from ELEvaluator so you can include a JSP taglibrary in your path if you want to provide support for EL. (But, really you are just providing support for EL-like syntax.) BTW, this is another one of those terrible situations where one codebase seems to have been split long ago, one incarnation lives in commons-el and another in standard. Tim - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: [EL] Docs ?
Hi Tim, Tim O'Brien wrote on Sunday, June 26, 2005 1:05 AM: EL is meant to be used in a JSP 2.0 environment. That's what I wanted to find out for commons-el, wheter it can be used standalone or not. I write a component, that others with EL experiance will have to use. You can get everything you need form Commons JEXL. [snip] Well, may I cite from the JEXl homepage: cite It must be noted that JEXL is not a compatibile implementation of EL as defined in JSTL 1.1 (JSR-052) or JSP 2.0 (JSR-152). For a compatible implementation of these specifications, see the Commons EL project. /cite If I release a component that claims to have EL support, any problem with it will cause maintenance effort on my side. - Jörg - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: [EL] Docs ?
EL is meant to be used in a JSP 2.0 environment. You can get everything you
need form Commons JEXL.
Here is some code for you:
import org.apache.commons.jexl.Expression;
import org.apache.commons.jexl.ExpressionFactory;
import org.apache.commons.jexl.JexlContext;
import org.apache.commons.jexl.JexlHelper;
SomeObject thingy = new SomeObject();
thingy.setFoo( Blah );
String expr =
JEXL let's you do everything you'd do with EL. ${thingy.foo};
Expression e = ExpressionFactory.createExpression( expr );
JexlContext jc = JexlHelper.createContext( );
jc.getVars( ).put(thingy, thingy);
String message = (String) e.evaluate(jc);
System.out.println( message );
Does that help?
-
Tim O'Brien
[EMAIL PROTECTED]
(847) 863-7045
-Original Message-
From: Jörg Schaible [mailto:[EMAIL PROTECTED]
Sent: Friday, June 24, 2005 11:51 AM
To: Jakarta Commons Users List
Subject: [EL] Docs ?
Hi folks,
looking at commons-el I wonder, how I can use it in a
standalone app. Unfortunately there are no docs how to
inialialize anything. In particular, the particularly
mensioned package overview does also not contain any
addtitional docs, in the repository is no package.html. Also
I cannot see any examples.
How to proceed?
- Jörg
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
