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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2013 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.flwor;

import net.sf.saxon.expr.Binding;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.LocalVariableReference;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.expr.parser.ExpressionVisitor;
import net.sf.saxon.expr.parser.RoleLocator;
import net.sf.saxon.expr.parser.TypeChecker;
import net.sf.saxon.expr.sort.AtomicComparer;
import net.sf.saxon.expr.sort.SortKeyDefinition;
import net.sf.saxon.trace.ExpressionPresenter;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.tree.util.FastStringBuffer;
import net.sf.saxon.value.AtomicValue;
import net.sf.saxon.value.SequenceType;

/**
 * This class represents an "order by" clause in a FLWOR expression
 */
public class OrderByClause extends Clause {

    SortKeyDefinition[] sortKeys;
    AtomicComparer[] comparators;
    TupleExpression tupleExpression;

    public OrderByClause(SortKeyDefinition[] sortKeys, TupleExpression tupleExpression) {
        this.sortKeys = sortKeys;
        this.tupleExpression = tupleExpression;
    }

    @Override
    public int getClauseKey() {
        return ORDERBYCLAUSE;
    }

    @Override
    public boolean containsNonInlineableVariableReference(Binding binding) {
        for (LocalVariableReference ref : tupleExpression.getSlots()) {
            if (ref.getBinding() == binding) {
                return true;
            }
        }
        return false;
    }

    public OrderByClause copy() {
        SortKeyDefinition[] sk2 = new SortKeyDefinition[sortKeys.length];
        for (int i=0; i