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package com.jclark.xsl.expr;
import com.jclark.xsl.om.*;
class ExtensionFunctionAvailableFunction implements Function {
public ConvertibleExpr makeCallExpr(ConvertibleExpr e[],
final NamespacePrefixMap prefixMap)
throws ParseException {
if (e.length != 1)
throw new ParseException("expected one argument");
final StringExpr se = e[0].makeStringExpr();
return new ConvertibleBooleanExpr() {
public boolean eval(Node node, ExprContext context) throws XSLException {
Name name = prefixMap.expandAttributeName(se.eval(node, context), node);
String ns = name.getNamespace();
if (ns == null)
return false;
return context.getExtensionContext(ns).available(name.getLocalPart());
}
};
}
}
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