Re: passing sitemap parameters to XSP?

Wed, 11 Aug 2004 08:29:22 -0700 

Try this:

<xsp:page language="java" xmlns:xsp="http://apache.org/xsp";
xmlns:xsp-request="http://apache.org/xsp/request/2.0"; 
xmlns:esql="http://apache.org/cocoon/SQL/v2";>
        <language-entry>
                <xsp:logic>String id = parameters.getParameter("id", "-1");</xsp:logic>
                <class>Language in Country</class>
                <id>
                        <xsp:expr>id</xsp:expr>
                </id>
        </language-entry>
</xsp:page>

Normally the page gets compiled and the language-entry is set as root element of the resulting page (after generation). Only at the time of generation the id parameter is known. If you're xsp:logic block is outside that 'user'-rootelement the contents will be "class-level" stuff and no parameters are available (more or less like static methods stuff, or member variables). When the page is constructed parameters are passed (ie class constructor gets parameters with it)

Do you know there are some pages at the wiki site about XSP?
These might help:

http://wiki.apache.org/cocoon/XSP
http://wiki.apache.org/cocoon/XSPSyntax

Kind Regards,
Jan

Lars Huttar wrote:

OK, I'm still struggling... I'm not used to putting raw
Java code in an XSP page.

I tried:

<xsp:page language="java" xmlns:xsp="http://apache.org/xsp";
xmlns:xsp-request="http://apache.org/xsp/request/2.0"; 
xmlns:esql="http://apache.org/cocoon/SQL/v2";>
 String id = parameters.getParameter("id", "-1");
        <language-entry>
                <class>Language in Country</class>
                <id>
                        <xsp:expr>id</xsp:expr>
                </id>
        </language-entry>
</xsp:page>

and got the error:

org.apache.cocoon.ProcessingException: Language Exception:
org.apache.cocoon.components.language.LanguageException: Error compiling 
language_entry_xsp: ERROR
1 (org\apache\cocoon\www\cvsmount\ethnologue\sources\language_entry_xsp.java): ...
this.characters("\n\t\t\t"); // start error (lines 325-325) "id cannot be resolved"
XSPObjectHelper.xspExpr(contentHandler, id); // end error this.characters("\n\t\t"); 
... Line 325,
column 0: id cannot be resolved

Line 325 says
        XSPObjectHelper.xspExpr(contentHandler, id);

I noticed that in language_entry_xsp.java, the
 String id = parameters.getParameter("id", "-1");
code was nowhere to be found.
Then I tried it with <xsp:logic> around that code:

<xsp:page language="java" xmlns:xsp="http://apache.org/xsp";
xmlns:xsp-request="http://apache.org/xsp/request/2.0"; 
xmlns:esql="http://apache.org/cocoon/SQL/v2";>
 <xsp:logic>String id = parameters.getParameter("id", "-1");</xsp:logic>
        <language-entry>
                <class>Language in Country</class>
                <id>
                        <xsp:expr>id</xsp:expr>
                </id>
        </language-entry>
</xsp:page>

but this gave the error:

Original Exception: java.lang.NullPointerException

        at
org.apache.cocoon.www.cvsmount.ethnologue.sources.language_entry_xsp.<init>(org.apache.cocoon.www.c
vsmount.ethnologue.sources.language_entry_xsp:239)

where line 239 is:
 String id = parameters.getParameter("id", "-1");

No doubt I'm doing something wrong but don't know what else to
try.

Thanks again,
Lars



-----Original Message-----
From: Jan Hoskens [mailto:[EMAIL PROTECTED]
Sent: Wednesday, August 11, 2004 7:20 AM
To: [EMAIL PROTECTED]
Subject: Re: passing sitemap parameters to XSP?



<xsp:page>
String id = parameters.getParameter("id", "defaultvalue");
</xsp:page>

Kind Regards,
Jan

Lars Huttar wrote:



Dear Cocoonists,
I'm trying to pass sitemap parameters to an XSP page:

<map:match pattern="data/language-entry/*">
<map:generate src="sources/language-entry.xsp"


type="serverpages">


        <map:parameter name="id" value="{1}" />
      </map:generate>
      <map:serialize type="xml" />
    </map:match>

But in the xsp page, where I use <xsp-request:get-parameter


name="id"/>,


the result is nothing (empty string).
This makes sense, since the parameter I'm looking for is
not a request parameter, so xsp-request shouldn't find it.

But then, how DO I pick up sitemap parameters?
(If I am using the term "sitemap parameter" right?)
It is documented in various places, including the xsp.xsl
logicsheet, that "parameters - parameters defined in the sitemap"
is one of the "Built-in parameters available for use" in XSP. But
nowhere can I find how to access it/them.

Any help is appreciated!

You are probably wondering why I don't use a request parameter,
e.g.
<map:match pattern="data/language-entry/*">
<map:generate src="sources/language-entry.xsp"


type="serverpages">


        <map:parameter name="id" value="{1}" />
      </map:generate>
      <map:serialize type="xml" />
    </map:match>

instead of a sitemap parameter.
That is an option.
I've been avoiding it because it would mean that when it
comes to using that parameter as part of a filename, for reading
or writing, I would have to take extra steps to make sure
someone doesn't try to sneak in values like "foo/../../etc"
and try to get access to files they shouldn't.

Thanks,
Lars


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