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/usr/include/osmium/handler/statistics.hpp is in libosmium-dev 0.0~20111213-g7f3500a-1build2.

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#ifndef OSMIUM_HANDLER_STATISTICS_HPP
#define OSMIUM_HANDLER_STATISTICS_HPP

/*

Copyright 2011 Jochen Topf <jochen@topf.org> and others (see README).

This file is part of Osmium (https://github.com/joto/osmium).

Osmium is free software: you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License or (at your option) the GNU
General Public License as published by the Free Software Foundation, either
version 3 of the Licenses, or (at your option) any later version.

Osmium 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 Lesser General Public License and the GNU
General Public License for more details.

You should have received a copy of the Licenses along with Osmium. If not, see
<http://www.gnu.org/licenses/>.

*/

#include <osmium/utils/sqlite.hpp>

namespace Osmium {

    namespace Handler {

        /**
         * Osmium handler that collects basic statistics from OSM data and
         * writes it to a Sqlite database.
         */
        class Statistics : public Base {

        public:

            Statistics() : Base() {
                // if you change anything in this array, also change the corresponding struct below
                static const char *sn[] = {
                    "nodes",
                    "nodes_without_tags",
                    "node_tags",
                    "max_node_id",
                    "max_tags_on_node",
                    "ways",
                    "way_tags",
                    "way_nodes",
                    "max_way_id",
                    "max_tags_on_way",
                    "max_nodes_on_way",
                    "closed_ways",
                    "relations",
                    "relation_tags",
                    "relation_members",
                    "max_relation_id",
                    "max_tags_on_relation",
                    "max_members_on_relation",
                    "max_user_id",
                    "anon_user_objects",
                    "max_node_version",
                    "max_way_version",
                    "max_relation_version",
                    "sum_node_version",
                    "sum_way_version",
                    "sum_relation_version",
                    "max_changeset_id",
                    0    // last element (sentinel) must always be 0
                };
                m_stat_names = sn;

                // initialize all statistics to zero
                for (int i=0; m_stat_names[i]; ++i) {
                    ((uint64_t*) &m_stats)[i] = 0;
                }
            }

            void node(const shared_ptr<Osmium::OSM::Node const>& node) {
                update_common_stats(node);
                m_stats.nodes++;
                if (m_tag_count == 0) {
                    m_stats.nodes_without_tags++;
                }
                if (m_id > (int64_t) m_stats.max_node_id) {
                    m_stats.max_node_id = m_id;
                }
                m_stats.node_tags += m_tag_count;
                if (m_tag_count > (int64_t) m_stats.max_tags_on_node) {
                    m_stats.max_tags_on_node = m_tag_count;
                }
                if (m_version > (int64_t) m_stats.max_node_version) {
                    m_stats.max_node_version = m_version;
                }
                m_stats.sum_node_version += m_version;
            }

            void way(const shared_ptr<Osmium::OSM::Way const>& way) {
                update_common_stats(way);
                m_stats.ways++;
                if (way->is_closed()) {
                    m_stats.closed_ways++;
                }
                if (m_id > (int64_t) m_stats.max_way_id) {
                    m_stats.max_way_id = m_id;
                }
                m_stats.way_tags += m_tag_count;
                m_stats.way_nodes += way->node_count();
                if (m_tag_count > (int64_t) m_stats.max_tags_on_way) {
                    m_stats.max_tags_on_way = m_tag_count;
                }
                if (way->node_count() > (int64_t) m_stats.max_nodes_on_way) {
                    m_stats.max_nodes_on_way = way->node_count();
                }
                if (m_version > (int64_t) m_stats.max_way_version) {
                    m_stats.max_way_version = m_version;
                }
                m_stats.sum_way_version += m_version;
            }

            void relation(const shared_ptr<Osmium::OSM::Relation const>& relation) {
                update_common_stats(relation);
                m_stats.relations++;
                if (m_id > (int64_t) m_stats.max_relation_id) {
                    m_stats.max_relation_id = m_id;
                }
                m_stats.relation_tags += m_tag_count;
                osm_sequence_id_t member_count = relation->members().size();
                m_stats.relation_members += member_count;
                if (m_tag_count > (int64_t) m_stats.max_tags_on_relation) {
                    m_stats.max_tags_on_relation = m_tag_count;
                }
                if (member_count > (int64_t) m_stats.max_members_on_relation) {
                    m_stats.max_members_on_relation = member_count;
                }
                if (m_version > (int64_t) m_stats.max_relation_version) {
                    m_stats.max_relation_version = m_version;
                }
                m_stats.sum_relation_version += m_version;
            }

            void final() {
                unlink("count.db");
                Sqlite::Database db("count.db");

                sqlite3* sqlite_db = db.get_sqlite3();
                if (SQLITE_OK != sqlite3_exec(sqlite_db, \
                                              "CREATE TABLE stats (" \
                                              "  key    TEXT, " \
                                              "  value  INT64 " \
                                              ");", 0, 0, 0)) {
                    std::cerr << "Database error: " << sqlite3_errmsg(sqlite_db) << "\n";
                    sqlite3_close(sqlite_db);
                    exit(1);
                }

                Sqlite::Statement* statement_insert_into_main_stats = db.prepare("INSERT INTO stats (key, value) VALUES (?, ?);");
                db.begin_transaction();

                for (int i=0; m_stat_names[i]; ++i) {
                    statement_insert_into_main_stats
                    ->bind_text(m_stat_names[i])
                    ->bind_int64( ((uint64_t*) &m_stats)[i] )
                    ->execute();
                }
                statement_insert_into_main_stats
                ->bind_text("nodes_with_tags")
                ->bind_int64( ((uint64_t*) &m_stats)[0] - ((uint64_t*) &m_stats)[1] )
                ->execute();

                db.commit();

                delete statement_insert_into_main_stats;
            }

        private:

            // if you change anything in this struct, also change the corresponding array above
            struct statistics {
                uint64_t nodes;
                uint64_t nodes_without_tags;
                uint64_t node_tags;
                uint64_t max_node_id;
                uint64_t max_tags_on_node;
                uint64_t ways;
                uint64_t way_tags;
                uint64_t way_nodes;
                uint64_t max_way_id;
                uint64_t max_tags_on_way;
                uint64_t max_nodes_on_way;
                uint64_t closed_ways;
                uint64_t relations;
                uint64_t relation_tags;
                uint64_t relation_members;
                uint64_t max_relation_id;
                uint64_t max_tags_on_relation;
                uint64_t max_members_on_relation;
                uint64_t max_user_id;
                uint64_t anon_user_objects;
                uint64_t max_node_version;
                uint64_t max_way_version;
                uint64_t max_relation_version;
                uint64_t sum_node_version;
                uint64_t sum_way_version;
                uint64_t sum_relation_version;
                uint64_t max_changeset_id;
            } m_stats;

            const char **m_stat_names;

            osm_object_id_t m_id;
            osm_version_t   m_version;
            int             m_tag_count;

            void update_common_stats(const shared_ptr<Osmium::OSM::Object const>& object) {
                m_id        = object->id();
                m_version   = object->version();
                m_tag_count = object->tags().size();

                osm_user_id_t uid = object->uid();
                if (uid == 0) {
                    m_stats.anon_user_objects++;
                }
                if (uid > (int64_t) m_stats.max_user_id) {
                    m_stats.max_user_id = uid;
                }

                osm_changeset_id_t changeset = object->changeset();
                if (changeset > (int64_t) m_stats.max_changeset_id) {
                    m_stats.max_changeset_id = changeset;
                }
            }

        }; // class Statistics

    } // namespace Handler

} // namespace Osmium

#endif // OSMIUM_HANDLER_STATISTICS_HPP