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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2015 Saxonica Limited.
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.functions;

import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.Item;
import net.sf.saxon.om.NodeInfo;
import net.sf.saxon.om.One;
import net.sf.saxon.om.ZeroOrOne;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.value.AnyURIValue;
import net.sf.saxon.value.AtomicValue;

/**
 * This class supports the namespace-uri() function
 */

public class NamespaceUri_1 extends ScalarSystemFunction {

    @Override
    public AtomicValue evaluate(Item item, XPathContext context) throws XPathException {
        String uri = ((NodeInfo) item).getURI();
        return new AnyURIValue(uri);
    }

    @Override
    public ZeroOrOne resultWhenEmpty() {
        return new One(new AnyURIValue(""));
    }


}