package eu.dnetlib.dhp.utils.saxon;

import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.lib.ExtensionFunctionCall;
import net.sf.saxon.lib.ExtensionFunctionDefinition;
import net.sf.saxon.om.Sequence;
import net.sf.saxon.om.StructuredQName;
import net.sf.saxon.trans.XPathException;

public abstract class AbstractExtensionFunction extends ExtensionFunctionDefinition {

	public static final String DEFAULT_SAXON_EXT_NS_URI = "http://www.d-net.research-infrastructures.eu/saxon-extension";

	public abstract String getName();

	public abstract Sequence doCall(XPathContext context, Sequence[] arguments) throws XPathException;

	@Override
	public StructuredQName getFunctionQName() {
		return new StructuredQName("dnet", DEFAULT_SAXON_EXT_NS_URI, getName());
	}

	@Override
	public ExtensionFunctionCall makeCallExpression() {
		return new ExtensionFunctionCall() {
			@Override
			public Sequence call(XPathContext context, Sequence[] arguments) throws XPathException {
				return doCall(context, arguments);
			}
		};
	}
}