Mailing-List: contact cocoon-dev-help@xml.apache.org; run by ezmlm
From: "Per Kreipke" <per@onclave.com>
To: <cocoon-dev@xml.apache.org>
Subject: Request taglib...
Date: Thu, 21 Sep 2000 12:08:17 -0400
Message-ID: <NDBBIKLOLMEELKELLPFIOELACOAA.per@onclave.com>
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Attached is some code to add missing functionality to the request taglib in
XSPRequestLibrary.java. It includes the following to return a node set of
all parameters.

public static Element getAllParameterValues(
	HttpServletRequest request,
	Document document
	) {
	String[] parameterNames = XSPRequestLibrary.getParameterNames(request);
	Element newElement =
document.createElement("request:all-parameter-values");

	for (int i = 0; i < parameterNames.length; i++) {
		Element paramElement = XSPRequestLibrary.getParameterValues(request,
parameterNames[i], document);
		newElement.appendChild(paramElement);
	}

	return(newElement);
}


It also includes additional functions which might make life easier and the
XML produced by the request taglib a little more terse for some
applications.

I'm sorry, I couldn't actually test a taglib snippet in request.xsl because
I haven't built my own taglibs yet. But it should look like somethign like
the following (only 'node' return types allowed):

  <xsl:template match="request:get-all-parameter-values">
    <xsl:variable name="as">
      <xsl:call-template name="value-for-as">
        <xsl:with-param name="default" select="'node'"/>
      </xsl:call-template>
    </xsl:variable>

    <xsp:expr>
      <xsl:choose>
        <xsl:when test="$as = 'node'">
          XSPRequestLibrary.getAllParameterValues(
            request,
            document
          )
        </xsl:when>
      </xsl:choose>
    </xsp:expr>
  </xsl:template>

Hope this helps someone. It helped me get request params into my XSL style
sheets.

Per.

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/**
Output all the request parameters as an element set,
using 'request:all-parameter-values' as the top element name.

Example: given request 'page.xml?test=3Dfoo&test=3Dbar&fix=3Dno', =
returns element set

 <request:all-parameter-values>
   <request:parameter-values name=3D"test">
     <request:parameter-value>foo</request:parameter-value>
     <request:parameter-value>bar</request:parameter-value>
   </request:parameter-values>
   <request:parameter-values name=3D"fix">
     <request:parameter-value>no</request:parameter-value>
   </request:parameter-values>
 </request:all-parameter-values>
**/
public static Element getAllParameterValues(
	HttpServletRequest request,=20
	Document document
	) {
	String[] parameterNames =3D =
XSPRequestLibrary.getParameterNames(request);
	Element newElement =3D =
document.createElement("request:all-parameter-values");
=09
	for (int i =3D 0; i < parameterNames.length; i++) {
		Element paramElement =3D XSPRequestLibrary.getParameterValues(request, =
parameterNames[i], document);
		newElement.appendChild(paramElement);
	}
=09
	return(newElement);
}
=09

/**
Output all the request parameters as an element set,
using the arg 'topTag' as the name of the enclosing element and =
'valueTag' as
the name of the value element if parameters have multiple values.

Example: given request 'page.xml?test=3Dfoo&test=3Dbar&fix=3Dno', and =
the call
'getAllParameters(request, document, "request", "val")', returns element =
set

<request>
  <test>
    <value>foo</value>
	<value>bar</value>
  </test>
  <fix>no</fix>
</request>

**/
public static Element getAllParameters(
	HttpServletRequest request,=20
	Document document,
	String topTag,
	String valueTag
	) {
	if (null =3D=3D topTag)
		topTag =3D "parameters";
=09
	if (null =3D=3D valueTag)
		valueTag =3D "value";
	=09
	String[] parameterNames =3D =
XSPRequestLibrary.getParameterNames(request);
	Element newElement =3D document.createElement(topTag);
=09
	for (int i =3D 0; i < parameterNames.length; i++) {
		Element nameElement;

		// Handle invalid tag names. HACK!
		if (!Character.isLetter(parameterNames[i].charAt(0)))
			nameElement =3D document.createElement("_" + parameterNames[i]);
		else
			nameElement =3D document.createElement(parameterNames[i]);
	=09
	    String[] values =3D request.getParameterValues(parameterNames[i]);
		if (values !=3D null) {
			if (1 < values.length) {
				for (int j =3D 0; j < values.length; j++) {
					Element valueElement;
					if (null =3D=3D valueTag)
						valueElement =3D =
document.createElement("request:parameter-value");
					else
						valueElement =3D document.createElement(valueTag);
 							valueElement.appendChild(document.createTextNode(values[j]));
					nameElement.appendChild(valueElement);
				}
			}
			else
				nameElement.appendChild(document.createTextNode(values[0]));
		}
=20
		// Build output node hierarchy
		newElement.appendChild(nameElement);
	}
=09
	return(newElement);
}


/** Shortcut for using default names for top and value elements **/
public static Element getAllParameters(
	HttpServletRequest request,=20
	Document document
	) {
	return(getAllParameters(request, document, null, null));
}


/** Shortcut for using default names for value elements **/
public static Element getAllParameters(
	HttpServletRequest request,=20
	Document document,
	String topTag
	) {
	return(getAllParameters(request, document, topTag, null));
}


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