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Message-ID: <416FCC0D.8060209@assa-systems.de>
Date: Fri, 15 Oct 2004 15:09:33 +0200
From: Thomas Krause <thomas.krause@assa-systems.de>
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To: users@cocoon.apache.org
Subject: Re: xsp: defining a recursive methode which produces xml elements
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I wrote to the cocoon dev to change this procedure but they think it's 
clear enough. The this xsp for example.

Thomas

Andreas Doms schrieb:
> I need to define a recursive methode which produces nested xml tags.
> 
> <xsp:logic>
> private void produced(...){
>   <a>   
>     produced(...);
>   </a>
> }
> </xsp:logic>
> 
> this gives the error "xspAttr cannot be resolved" because the xspAttr is 
> not known the gerated methode.
> 
> Any concept to solve this problem elegant?
> 
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Content-Type: text/xml;
 name="groups-hierarchy.xsp"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="groups-hierarchy.xsp"

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE xsp:page [
  <!ENTITY % ISOlat1 PUBLIC "ISO 8879-1986//ENTITIES Added Latin 1//EN//XML" "ISOlat1.pen">
  %ISOlat1;
  <!ENTITY % ISOnum PUBLIC "ISO 8879:1986//ENTITIES Numeric and Special Graphic//EN//XML" "ISOnum.pen">
  %ISOnum;
]>

<!-- Generate the group hierachy -->
<!-- -->
<!-- @author <a href="thomas.krause@assa-systems.de">Thomas Krause</a> -->
<!-- @version $Revision: 1.2 $ $Date: 2004/05/14 09:05:27 $
<!-- -->

<xsp:page language="java" 
  xmlns:xsp="http://apache.org/xsp" 
  xmlns:xsp-request="http://apache.org/xsp/request/2.0"
  xmlns:log="http://apache.org/xsp/log/2.0" 
  xmlns:capture="http://apache.org/cocoon/capture/1.0"
  xmlns:session="http://apache.org/xsp/session/2.0"
  xmlns:assa-project="http://heimhuber.net/cocoon/assa-project/1.0"
>


    <xsp:structure>
      <xsp:include>de.heimhuber.emiproject.ejb.*</xsp:include>
      <xsp:include>java.util.*</xsp:include>
    </xsp:structure>
    
    <!-- go recursive thrue the hierarchy of groups -->
    <!-- the param xspAttr is required for SAX -->
    <!-- I think you can also use "AttributesImpl xspAttr = new AttributesImpl();" to create a new xspAttr -->
    <xsp:logic>
    private void processGroupHierarchyNode( org.xml.sax.helpers.AttributesImpl xspAttr, GroupHierarchyNode node) throws Exception
    {
        Iterator iterator;
        GroupData group = node.getGroup();
        <node>
            <!-- copy this group part from group.xsp -->
            <group>
                <id><xsp:expr>group.getId()</xsp:expr></id>
                <name><xsp:expr>group.getName()</xsp:expr></name>
                <xsp:logic>
                    if ( group.getParent() != null ) {
                        <parent>
                          <xsp:attribute name="id"><xsp:expr>group.getParent().getId()</xsp:expr></xsp:attribute>
                          <xsp:expr>group.getParent().getName()</xsp:expr>
                        </parent>
                    }
                    if ( group.getBoss() != null ) {
                        <boss>
                          <xsp:attribute name="id"><xsp:expr>group.getBoss().getId()</xsp:expr></xsp:attribute>
                          <xsp:expr>group.getBoss().getUsername()</xsp:expr>
                        </boss>
                    }
                    if ( group.getApprover() != null ) {
                        <approver>
                          <xsp:attribute name="id"><xsp:expr>group.getApprover().getId()</xsp:expr></xsp:attribute>
                          <xsp:expr>group.getApprover().getUsername()</xsp:expr>
                        </approver>
                    }
                    if ( group.getProjectManager() != null ) {
                        <project-manager>
                          <xsp:attribute name="id"><xsp:expr>group.getProjectManager().getId()</xsp:expr></xsp:attribute>
                          <xsp:expr>group.getProjectManager().getUsername()</xsp:expr>
                        </project-manager>
                    }
                    if ( group.getIsProjectTarget().booleanValue() ) {
                        <is-project-target>1</is-project-target>
                    }
                    else {
                        <is-project-target>0</is-project-target>
                    }
                    if ( group.getProjectControler() != null ) {
                        <project-controler>
                          <xsp:attribute name="id"><xsp:expr>group.getProjectControler().getId()</xsp:expr></xsp:attribute>
                          <xsp:expr>group.getProjectControler().getUsername()</xsp:expr>
                        </project-controler>
                    }
                    if ( group.getProjectTracker() != null ) {
                        <project-tracker>
                          <xsp:attribute name="id"><xsp:expr>group.getProjectTracker().getId()</xsp:expr></xsp:attribute>
                          <xsp:expr>group.getProjectTracker().getUsername()</xsp:expr>
                        </project-tracker>
                    }
                </xsp:logic>
            </group>
            <!-- -->
            <admins>
            </admins>
            <!-- -->
            <users>
            </users>
            <!-- -->
            <level><xsp:expr>node.getLevel()</xsp:expr></level>
            <max-childs><xsp:expr>node.getMaxChilds()</xsp:expr></max-childs>
            <!-- -->
            <!-- it's for html-table rendering (colspan)-->
            <xsp:logic>
                int numberOfChildGroups = node.getChildGroups().size();
                if ( numberOfChildGroups == 0 ) { numberOfChildGroups = 1; }
            </xsp:logic>
            <number-of-child-groups><xsp:expr>numberOfChildGroups</xsp:expr></number-of-child-groups>
            <!-- -->
            <child-groups>
                <xsp:logic>
                    iterator = node.getChildGroups().iterator();
                    while ( iterator.hasNext() )
                    {
                        this.processGroupHierarchyNode( xspAttr, (GroupHierarchyNode)iterator.next() );
                    }
                </xsp:logic>
            </child-groups>
        </node>
    }
    </xsp:logic>


    <!-- this is the entry point -->
    <page>
        <assa-project:error-page>empty.html</assa-project:error-page>

        <xsp:logic>
            Iterator hierarchyIterator = GroupUtil.getHome().getGroupHierarchies().iterator();
            while ( hierarchyIterator.hasNext() )
            {
                GroupHierarchyNode rootNode = (GroupHierarchyNode)hierarchyIterator.next();
                <group-hierarchy>
                    <xsp:attribute name="name"><xsp:expr>rootNode.getGroup().getName()</xsp:expr></xsp:attribute>
                    <xsp:logic>
                        <!-- It's a little bit tricky, but the parameter "xspAttr" is generated while the transformation from xsp to java -->
                        <!-- Please see the resulting java file to validate this -->
                        this.processGroupHierarchyNode( xspAttr, rootNode );
                    </xsp:logic>
                </group-hierarchy>
            }
        </xsp:logic>
    </page>



</xsp:page>


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