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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2023 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.expr.elab;

import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.GroundedValue;
import net.sf.saxon.om.Sequence;
import net.sf.saxon.trans.XPathException;

/**
 * A {@link SequenceEvaluator} for literals. This is a trivial implementation of the interface,
 * because the value of a literal is already known.
 */

public class LiteralEvaluator implements SequenceEvaluator {

    final GroundedValue value;

    public LiteralEvaluator(GroundedValue value) {
        this.value = value;
    }

    /**
     * Evaluate a construct to produce a value (which might be a lazily evaluated Sequence)
     *
     * @param context the evaluation context
     * @return a Sequence (not necessarily grounded)
     * @throws XPathException if a dynamic error occurs during the evaluation.
     */
    @Override
    public Sequence evaluate(XPathContext context) throws XPathException {
        return value;
    }

}