geometrycollection.h

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/*    Copyright 2014 MongoDB Inc.
 *
 *    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.
 */

#pragma once

#include <boost/scoped_ptr.hpp>
#include <vector>

#include "mongo/client/export_macros.h"
#include "mongo/db/jsobj.h"
#include "mongo/geo/boundingbox.h"
#include "mongo/geo/constants.h"
#include "mongo/geo/geometry.h"
#include "mongo/geo/geoobj.h"
#include "mongo/geo/parser.h"
#include "mongo/util/assert_util.h"

namespace mongo {
namespace geo {

// forward declaration needed to parse arbitrary geometries
template <typename TCoordinates>
class Parser;

template <typename TCoordinates>
class GeometryCollection : public Geometry<TCoordinates> {
public:
    explicit GeometryCollection(const BSONObj& bson);

    ~GeometryCollection();

    virtual BSONObj toBSON() const {
        return _bson;
    }

    virtual BoundingBox<TCoordinates> getBoundingBox() const;

    virtual GeoObjType getType() const {
        return GeoObjType_GeometryCollection;
    }

    const std::vector<const GeoObj<TCoordinates>*>& getGeometries() const;

private:
    static std::vector<const GeoObj<TCoordinates>*> parseGeometries(const BSONObj& bson);

    BSONObj _bson;
    std::vector<const GeoObj<TCoordinates>*> _geometries;
    mutable boost::scoped_ptr<BoundingBox<TCoordinates> > _boundingBox;

    BoundingBox<TCoordinates>* computeBoundingBox() const;
};

template <typename TCoordinates>
GeometryCollection<TCoordinates>::GeometryCollection(const BSONObj& bson)
    : _bson(GeoObj<TCoordinates>::validateType(bson, kGeometryCollectionTypeStr)),
      _geometries(parseGeometries(bson)),
      _boundingBox(Geometry<TCoordinates>::parseBoundingBox(bson)) {}

template <typename TCoordinates>
GeometryCollection<TCoordinates>::~GeometryCollection() {
    for (size_t i = 0; i < _geometries.size(); ++i)
        delete _geometries[i];
}

template <typename TCoordinates>
BoundingBox<TCoordinates> GeometryCollection<TCoordinates>::getBoundingBox() const {
    if (!_boundingBox)
        _boundingBox.reset(computeBoundingBox());
    return *_boundingBox.get();
}

template <typename TCoordinates>
const std::vector<const GeoObj<TCoordinates>*>& GeometryCollection<TCoordinates>::getGeometries()
    const {
    return _geometries;
}

template <typename TCoordinates>
std::vector<const GeoObj<TCoordinates>*> GeometryCollection<TCoordinates>::parseGeometries(
    const BSONObj& bson) {
    BSONElement geometriesField = bson.getField(kGeometriesFieldName);
    uassert(0,
            "bson must contain a field \"geometries\" of type Array",
            !geometriesField.eoo() && geometriesField.type() == Array);

    std::vector<BSONElement> geometriesArr = geometriesField.Array();
    std::vector<const GeoObj<TCoordinates>*> geometries;
    for (size_t i = 0; i < geometriesArr.size(); ++i) {
        geometries.push_back(Parser<TCoordinates>::parse(geometriesArr[i].Obj()));
    }
    return geometries;
}

template <typename TCoordinates>
BoundingBox<TCoordinates>* GeometryCollection<TCoordinates>::computeBoundingBox() const {
    std::vector<BoundingBox<TCoordinates> > bboxes;
    for (size_t i = 0; i < _geometries.size(); ++i)
        bboxes.push_back(_geometries[i]->getBoundingBox());
    return Geometry<TCoordinates>::computeBoundingBox(bboxes);
}

}  // namespace geo
}  // namespace mongo