FunctionAvailableFunction.java [plain text]
package gnu.xml.transform;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.TreeSet;
import javax.xml.namespace.NamespaceContext;
import javax.xml.xpath.XPathFunction;
import javax.xml.xpath.XPathFunctionException;
import org.w3c.dom.Node;
import gnu.xml.xpath.Expr;
import gnu.xml.xpath.Function;
class FunctionAvailableFunction
extends Expr
implements Function, XPathFunction
{
static final Collection xsltFunctions;
static final Collection xpathFunctions;
static
{
TreeSet acc = new TreeSet();
acc.add("document");
acc.add("key");
acc.add("format-number");
acc.add("current");
acc.add("unparsed-entity-uri");
acc.add("generate-id");
acc.add("system-property");
acc.add("element-available");
acc.add("function-available");
xsltFunctions = Collections.unmodifiableSet(acc);
acc = new TreeSet();
acc.add("boolean");
acc.add("ceiling");
acc.add("concat");
acc.add("contains");
acc.add("count");
acc.add("false");
acc.add("floor");
acc.add("id");
acc.add("lang");
acc.add("last");
acc.add("local-name");
acc.add("name");
acc.add("namespace-uri");
acc.add("normalize-space");
acc.add("not");
acc.add("number");
acc.add("position");
acc.add("round");
acc.add("starts-with");
acc.add("string");
acc.add("string-length");
acc.add("substring-after");
acc.add("substring-before");
acc.add("substring");
acc.add("sum");
acc.add("translate");
acc.add("true");
xpathFunctions = Collections.unmodifiableSet(acc);
}
final NamespaceContext nsctx;
List args;
FunctionAvailableFunction(NamespaceContext nsctx)
{
this.nsctx = nsctx;
}
public Object evaluate(List args)
throws XPathFunctionException
{
return Collections.EMPTY_SET;
}
public void setArguments(List args)
{
this.args = args;
}
public Object evaluate(Node context, int pos, int len)
{
Expr arg = (Expr) args.get(0);
Object val = arg.evaluate(context, pos, len);
String name = _string(context, val);
String prefix, localName, uri;
int ci = name.indexOf(':');
if (ci == -1)
{
prefix = null;
localName = name;
}
else
{
prefix = name.substring(0, ci);
localName = name.substring(ci + 1);
}
uri = nsctx.getNamespaceURI(prefix);
if (uri == null)
{
return xsltFunctions.contains(localName) ||
xpathFunctions.contains(localName) ?
Boolean.TRUE : Boolean.FALSE;
}
return Boolean.FALSE;
}
public Expr clone(Object context)
{
NamespaceContext n = nsctx;
if (context instanceof NamespaceContext)
{
n = (NamespaceContext) context;
}
FunctionAvailableFunction f = new FunctionAvailableFunction(n);
int len = args.size();
List args2 = new ArrayList(len);
for (int i = 0; i < len; i++)
{
args2.add(((Expr) args.get(i)).clone(context));
}
f.setArguments(args2);
return f;
}
}