NgramExtractor.h

// Copyright (C) 2013 The University of Michigan
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Authors - Chun-Hung Hsiao (chhsiao@umich.edu)
//

#ifndef NGRAMEXTRACTOR_H
#define NGRAMEXTRACTOR_H

#include <map>
#include <string>
#include <vector>
#include "OperationPrinter.h"

using std::map;
using std::string;
using std::vector;

class NgramExtractor {
    public:
        virtual ~NgramExtractor() { }

	virtual string Extract(Statement* node, int n, bool long_desc = false) = 0;

    protected:
	inline string Serialize(Statement* node) { return serializer_.Print(node); }

    private:
	OperationPrinter serializer_;
};

#endif // NGRAMEXTRACTOR_H