Lanes

src/main/java/cz/cvut/fel/aic/graphimporter/geojson/GeoJSONException.java

@@ -0,0 +1,12 @@
+package cz.cvut.fel.aic.graphimporter.geojson;
+
+import org.json.simple.JSONObject;
+
+/**
+ * @author Zdenek Bousa
+ */
+class GeoJSONException extends Exception {
+    GeoJSONException(JSONObject properties, String key) {
+        super("Missing key: \'" + key + "\' in GeoJSON properties: " + properties);
+    }
+}

src/main/java/cz/cvut/fel/aic/graphimporter/geojson/GeoJSONParser.java

@@ -0,0 +1,170 @@
+package cz.cvut.fel.aic.graphimporter.geojson;
+
+import org.json.simple.JSONArray;
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+import org.json.simple.parser.ParseException;
+
+import java.util.*;
+
+/**
+ * @author Zdenek Bousa
+ */
+public class GeoJSONParser {
+    static float tryParseFloat(JSONObject properties, String key, float defaultValue) {
+        float value;
+        try {
+            value = tryParseFloat(properties, key);
+        } catch (GeoJSONException e) {
+            value = defaultValue;
+        }
+        return value;
+    }
+
+    static float tryParseFloat(JSONObject properties, String key) throws GeoJSONException {
+        float value;
+        Object valueObject = properties.get(key);
+        if (valueObject instanceof Number) {
+            value = ((Number) valueObject).floatValue();
+        } else if (valueObject instanceof String) {
+            String valueString = (String) valueObject;
+            value = Float.parseFloat(valueString);
+        } else {
+            throw new GeoJSONException(properties, key);
+        }
+        return value;
+    }
+
+    static Long tryParseLong(JSONObject properties, String key, long defaultValue) {
+        Long value;
+        try {
+            value = tryParseLong(properties, key);
+        } catch (GeoJSONException e) {
+            value = defaultValue;
+        }
+        return value;
+    }
+
+    static Long tryParseLong(JSONObject properties, String key) throws GeoJSONException {
+        Object valueObject = properties.get(key);
+        Long value;
+        if (valueObject instanceof Number) {
+            value = ((Number) valueObject).longValue();
+        } else if (valueObject instanceof String) {
+            String valueString = (String) valueObject;
+            value = Long.parseLong(valueString);
+        } else {
+            throw new GeoJSONException(properties, key);
+        }
+        return value;
+    }
+
+    static int tryParseInt(JSONObject properties, String key, int defaultValue) {
+        int value;
+        try {
+            value = tryParseInt(properties, key);
+        } catch (GeoJSONException e) {
+            value = defaultValue;
+        }
+        return value;
+    }
+
+    static int tryParseInt(JSONObject properties, String key) throws GeoJSONException {
+        int value;
+        Object valueObject = properties.get(key);
+        if (valueObject instanceof Number) {
+            value = ((Number) valueObject).intValue();
+        } else if (valueObject instanceof String) {
+            String valueString = (String) valueObject;
+            value = Integer.parseInt(valueString);
+        } else {
+            throw new GeoJSONException(properties, key);
+        }
+        return value;
+    }
+
+
+    static Map<String, Object> tryParseDict(JSONObject properties, String key) throws GeoJSONException {
+        Map<String, Object> map = null;
+        JSONObject value;
+        if (key != null) {
+            if (properties != null) {
+                value = (JSONObject) properties.get(key);
+            } else {
+                return null;
+            }
+        } else {
+            value = properties;
+        }
+        if (value != null) {
+            map = getMap(value);
+        }
+        return map;
+    }
+
+    static List<JSONObject> tryParseList(JSONObject properties, String key) throws GeoJSONException {
+        JSONArray m = (JSONArray) properties.get(key);
+        if (m == null){
+            return null;
+        }
+
+        List<JSONObject> list = new ArrayList<>();
+        for (Object aM : m) {
+            if (aM instanceof JSONObject) {
+                list.add((JSONObject) aM);
+            } else {
+                throw new GeoJSONException(properties, key);
+            }
+        }
+        return list;
+    }
+
+    static JSONObject parseStringToJSON(String tagsString) {
+        if (tagsString == null) return null;
+        tagsString = "{" + tagsString.replaceAll("=>", ":") + "}";
+        JSONObject json;
+        JSONParser parser = new JSONParser();
+        try {
+            json = (JSONObject) parser.parse(tagsString);
+        } catch (ParseException e) {
+            e.printStackTrace();
+            json = null;
+        }
+        return json;
+    }
+
+    private static Map<String, Object> getMap(JSONObject object) throws GeoJSONException {
+        Map<String, Object> map = new HashMap<>();
+
+        Set keys = object.keySet();
+        for (Object keyO : keys) {
+            Object value = object.get(keyO);
+
+            if (value instanceof JSONArray) {
+                value = getList((JSONArray) value);
+            } else if (value instanceof JSONObject) {
+                value = getMap((JSONObject) value);
+            } 
+
+            if (keyO instanceof String) {
+                map.put((String) keyO, value);
+            } else {
+                return null;
+            }
+        }
+        return map;
+    }
+
+    private static List<Object> getList(JSONArray array) throws GeoJSONException {
+        List<Object> list = new ArrayList<>();
+        for (Object value : array) {
+            if (value instanceof JSONArray) {
+                value = getList((JSONArray) value);
+            } else if (value instanceof JSONObject) {
+                value = getMap((JSONObject) value);
+            }
+            list.add(value);
+        }
+        return list;
+    }
+}