I apologize if this is the wrong place to ask, but I am
having trouble solving this problem. I have written
a custom JSP tag for use in a struts 1.1 application
I am implementing. I have a domain object called
Series which has a method getCategoryIds that
returns a HashSet of Integers. A Series object
"series" is in the session when the following
JSP get invoked (its actually a struts-tile, probably
to complicate things further):
<%@ page isELIgnored="false" %>
<%@ taglib uri="/tags/struts-html" prefix="html" %>
<%@ taglib uri="/tags/struts-tiles" prefix="tiles" %>
<%@ taglib uri="/tags/els" prefix="els" %>
<!-- begin SeriesProps -->
<html:xhtml/>
<tr>
<td valign="top"><tiles:get name="titleLabel"/></td>
<td align="left"><html:text size="30" property="title"/></td>
</tr>
<td valign="top"><tiles:get name="descriptionLabel"/></td>
<td align="left">
<html:textarea cols="30" rows="3" property="description"/>
</td>
<tr>
<td valign="top"><tiles:get name="categoriesLabel"/></td>
<td align="left">
<els:categories property="categoryId" labelClass="text"
var="${series.categoryIds}"/>
</td>
</tr>
...
Anyway, I have been looking at other custom tags trying to figure out how
to get the collection into the custom tag I've written. It appears that
a class
called ExpressionEvaluatorManager would be used to get the collection
from the expression: ${series.categoryIds}, yet it goes too far and converts
the collection to a String like: "[1, 2, 7]". In the TLD for the tag I
write:
<tag>
<name>categories</name>
<tagclass>fi.els.tags.CategoriesTag</tagclass>
<attribute>
<name>property</name>
<required>true</required>
</attribute>
<attribute>
<name>labelClass</name>
<required>true</required>
</attribute>
<attribute>
<name>var</name>
<type>java.lang.Object</type>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
I attempt to get the collection back into the
tag as follows:
public class CategoriesTag extends TagSupport
{ public CategoriesTag()
{
super();
init();
}
public int doStartTag() throws JspException
{
if (this.var != null)
{
Object collection = ExpressionEvaluatorManager.evaluate("var",
this.var, Object.class, this, pageContext);
if (collection != null)
{
if (collection instanceof java.lang.String[])
log.debug("AAA: String[]");
else if (collection instanceof java.lang.String)
log.debug("AAA: String");
else
log.debug("AAA: Other");
}
}
...
public void setVar
(
String var
)
{
log.debug("AAA: setting var = '" + var + "'");
this.var = var;
}
private void init()
{
categoryIds = new HashSet();
var = null;
}
...
}
Like I said earlier, the HashSet collection is getting transformed
into a String. Can anyone tell me what I am doing wrong?
Thanks.
Dean
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