/**
 * Copyright (C) 2016 MongoDB Inc.
 *
 * This program is free software: you can redistribute it and/or  modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * As a special exception, the copyright holders give permission to link the
 * code of portions of this program with the OpenSSL library under certain
 * conditions as described in each individual source file and distribute
 * linked combinations including the program with the OpenSSL library. You
 * must comply with the GNU Affero General Public License in all respects
 * for all of the code used other than as permitted herein. If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so. If you do not
 * wish to do so, delete this exception statement from your version. If you
 * delete this exception statement from all source files in the program,
 * then also delete it in the license file.
 */

#pragma once

#include "mongo/db/pipeline/expression_context.h"

namespace mongo {

/**
 * An ExpressionContext that can have state like the collation and resolved namespace map
 * manipulated after construction. In contrast, a regular ExpressionContext requires the collation
 * and resolved namespaces to be provided on construction and does not allow them to be subsequently
 * mutated.
 */
class ExpressionContextForTest : public ExpressionContext {
public:
    ExpressionContextForTest() = default;

    ExpressionContextForTest(OperationContext* opCtx, const AggregationRequest& request)
        : ExpressionContext(opCtx, request, nullptr, {}) {}

    /**
     * Changes the collation used by this ExpressionContext. Must not be changed after parsing a
     * Pipeline with this ExpressionContext.
     */
    void setCollator(std::unique_ptr<CollatorInterface> collator) {
        ExpressionContext::setCollator(std::move(collator));
    }

    /**
     * Sets the resolved definition for an involved namespace.
     */
    void setResolvedNamespace(const NamespaceString& nss, ResolvedNamespace resolvedNamespace) {
        _resolvedNamespaces[nss.coll()] = std::move(resolvedNamespace);
    }
};

}  // namespace mongo