Split Encoding Decoding Logic

xml_converter/src/packaging_protobin.cpp

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+#include "packaging_protobin.hpp"
+
+#include <fstream>
+#include <map>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "category_gen.hpp"
+#include "parseable.hpp"
+#include "string_helper.hpp"
+#include "waypoint.pb.h"
+
+using namespace std;
+
+////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////// SERIALIZE ///////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+////////////////////////////////////////////////////////////////////////////////
+void parse_waypoint_categories(
+    string full_category_name,
+    ::waypoint::Category proto_category,
+    map<string, Category>* marker_categories,
+    vector<Parseable*>* parsed_pois) {
+    full_category_name += proto_category.name();
+    Category* this_category = &(*marker_categories)[full_category_name];
+    this_category->parse_protobuf(proto_category);
+
+    for (int i = 0; i < proto_category.icon_size(); i++) {
+        Icon* icon = new Icon();
+        icon->parse_protobuf(proto_category.icon(i));
+        // TODO: The field category in Icon is being deprciated
+        // This overwrites any icon.category with its position in the heirarchy
+        icon->category.category = full_category_name;
+        parsed_pois->push_back(icon);
+    }
+    for (int i = 0; i < proto_category.trail_size(); i++) {
+        Trail* trail = new Trail();
+        trail->parse_protobuf(proto_category.trail(i));
+        // TODO: The field category in Trail is being deprciated
+        // This overwrites any trail.category with its position in the heirarchy
+        trail->category.category = full_category_name;
+        parsed_pois->push_back(trail);
+    }
+
+    for (int i = 0; i < proto_category.children_size(); i++) {
+        parse_waypoint_categories(full_category_name + ".", proto_category.children(i), &(this_category->children), parsed_pois);
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//
+////////////////////////////////////////////////////////////////////////////////
+void read_protobuf_file(string proto_filepath, map<string, Category>* marker_categories, vector<Parseable*>* parsed_pois) {
+    fstream infile;
+    waypoint::Waypoint proto_message;
+
+    infile.open(proto_filepath, ios::in | ios::binary);
+    proto_message.ParseFromIstream(&infile);
+    for (int i = 0; i < proto_message.category_size(); i++) {
+        parse_waypoint_categories("", proto_message.category(i), marker_categories, parsed_pois);
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+///////////////////////////////// DESERIALIZE //////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+// Adds the name of a category and all of it's parents to a set
+// eg.
+// {
+//     "mypath",
+//     "mypath.easypath",
+//     "mypath.easypath.trail",
+//     "mypath.hardpath",
+//     "mypath.hardpath.trail",
+// }
+////////////////////////////////////////////////////////////////////////////////
+void populate_categories_to_retain(string category_name, set<string>* categories_to_retain) {
+    string name;
+    vector<string> split_categories = split(category_name, ".");
+    for (unsigned int j = 0; j < split_categories.size(); j++) {
+        name += split_categories[j];
+        categories_to_retain->insert(name);
+        name += ".";
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Iterates through all children of a Category and removes the categories and
+// POIs that do not belong on a particular map
+////////////////////////////////////////////////////////////////////////////////
+void remove_waypoint_elements(waypoint::Category* proto_category, set<string> categories_to_retain, string parent_name, int map_id) {
+    int keep = 0;
+    for (int i = 0; i < proto_category->icon_size(); i++) {
+        if (proto_category->icon(i).map_id() == map_id) {
+            if (keep < i) {
+                proto_category->mutable_icon()->SwapElements(i, keep);
+            }
+            ++keep;
+        }
+    }
+    proto_category->mutable_icon()->DeleteSubrange(keep, proto_category->icon_size() - keep);
+
+    keep = 0;
+    for (int i = 0; i < proto_category->trail_size(); i++) {
+        if (proto_category->trail(i).map_id() == map_id) {
+            if (keep < i) {
+                proto_category->mutable_trail()->SwapElements(i, keep);
+            }
+            ++keep;
+        }
+    }
+    proto_category->mutable_trail()->DeleteSubrange(keep, proto_category->trail_size() - keep);
+
+    keep = 0;
+    for (int i = 0; i < proto_category->children_size(); i++) {
+        string name = parent_name + "." + proto_category->children(i).name();
+        auto pos = categories_to_retain.find(name);
+        if (pos != categories_to_retain.end()) {
+            remove_waypoint_elements(proto_category->mutable_children(i), categories_to_retain, name, map_id);
+            if (keep < i) {
+                proto_category->mutable_children()->SwapElements(i, keep);
+            }
+            ++keep;
+        }
+    }
+    proto_category->mutable_children()->DeleteSubrange(keep, proto_category->children_size() - keep);
+}
+
+void write_protobuf_file(string proto_directory, map<string, Category>* marker_categories, vector<Parseable*>* parsed_pois) {
+    waypoint::Waypoint proto_pois;
+    // Collects a set of map ids from Icon and Trail data
+    std::set<int> map_ids;
+    ofstream trail_data_file;
+    map<string, vector<Parseable*>> map_of_pois;
+    for (const auto& parsed_poi : *parsed_pois) {
+        if (parsed_poi->classname() == "POI") {
+            Icon* icon = dynamic_cast<Icon*>(parsed_poi);
+            map_ids.insert(icon->map_id);
+            map_of_pois[icon->category.category].push_back(icon);
+        }
+        else if (parsed_poi->classname() == "Trail") {
+            Trail* trail = dynamic_cast<Trail*>(parsed_poi);
+            map_ids.insert(trail->map_id);
+            map_of_pois[trail->category.category].push_back(trail);
+        }
+    }
+
+    // Creates a Waypoint message that contains all categories
+    waypoint::Waypoint all_categories;
+    for (const auto& category : *marker_categories) {
+        waypoint::Category proto_category = category.second.as_protobuf("", &map_of_pois);
+        all_categories.add_category()->CopyFrom(proto_category);
+    }
+
+    waypoint::Waypoint output_message;
+    std::set<string> categories_to_retain;
+    for (int map_id : map_ids) {
+        ofstream outfile;
+        string output_filepath = proto_directory + "/" + to_string(map_id) + ".data";
+        outfile.open(output_filepath, ios::out | ios::binary);
+        output_message.MergeFrom(all_categories);
+
+        for (const auto& parsed_poi : *parsed_pois) {
+            if (parsed_poi->classname() == "POI") {
+                Icon* icon = dynamic_cast<Icon*>(parsed_poi);
+                if (icon->map_id == map_id) {
+                    populate_categories_to_retain(icon->category.category, &categories_to_retain);
+                }
+            }
+            else if (parsed_poi->classname() == "Trail") {
+                Trail* trail = dynamic_cast<Trail*>(parsed_poi);
+                if (trail->map_id == map_id) {
+                    populate_categories_to_retain(trail->category.category, &categories_to_retain);
+                }
+            }
+        }
+        // In the XML, MarkerCategories have a tree hierarchy while POIS have a
+        // flat hierarchy. In Waypoint, POIs are elements of the category they
+        // belong to. We are removing instead of inserting because
+        // each parent category contains the data for all of its children. It
+        // would be impractical to include all of the data from each category
+        // except for the children and then iterating over all the children.
+        // This pruning method is slower but ensures that information is kept.
+        for (int i = 0; i < output_message.category_size(); i++) {
+            remove_waypoint_elements(output_message.mutable_category(i), categories_to_retain, output_message.category(i).name(), map_id);
+            if (output_message.mutable_category(i)->children_size() == 0) {
+                output_message.mutable_category(i)->Clear();
+            }
+        }
+        output_message.SerializeToOstream(&outfile);
+        outfile.close();
+        output_message.Clear();
+        categories_to_retain.clear();
+    }
+}

xml_converter/src/packaging_protobin.hpp

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+#pragma once
+
+#include <fstream>
+#include <map>
+#include <string>
+#include <vector>
+
+#include "category_gen.hpp"
+#include "parseable.hpp"
+#include "waypoint.pb.h"
+
+void read_protobuf_file(
+    std::string proto_filepath,
+    std::map<std::string, Category>* marker_categories,
+    std::vector<Parseable*>* parsed_pois);
+
+void write_protobuf_file(
+    std::string proto_directory,
+    std::map<std::string, Category>* marker_categories,
+    std::vector<Parseable*>* parsed_pois);