SimpleGraph-JSON
Maria Fahl, Wolfgang Fahl
Contents
SimpleGraph JSON module
The SimpleGraph JSON module makes JSON parse results accessible to Graph processing. see JSON.
Sources
- System: JsonSystem.java
- JUnit-Test: TestJsonSystem.java
SimpleGraph JSON module
The SimpleGraph JSON module makes JSON parse results accessible to Graph processing. see JSON.
Sources
- System: JsonSystem.java
- JUnit-Test: TestJsonSystem.java
SimpleGraph JSON module
The SimpleGraph JSON module makes JSON parse results accessible to Graph processing. see JSON.
Sources
- System: JsonSystem.java
- JUnit-Test: TestJsonSystem.java
Contents
Example[edit]
Goal[edit]
We would like to retrieve the latitute of cologne cathedral from the Google Maps API. The query returns JSON data for the location of cologne cathedral.
Result[edit]
50.9412
Explanation[edit]
JUnit Test for SimpleGraph JSON module[edit]
We would like to get the JSON nodes in the raw result below that have the latitude information. We are looking for nodes with the name "location" and the property "lat". The line
dom.g().V().hasLabel("location").forEachRemaining(v->latHolder.add(v.property("lat").value().toString()));
String lat=latHolder.getFirstValue();
Does the work for us by traversing the JSON parser graph created with the two lines:
JsonSystem js = new JsonSystem();
SimpleSystem dom = js.connect("json", json);
JUnit Test case[edit]
@Test
public void testGoogleMapsJsonApi() throws Exception {
String url="https://maps.googleapis.com/maps/api/geocode/json?address=Cologne%20Cathedral";
String json=IOUtils.toString(new URL(url),"UTF-8");
debug=true;
if (debug)
System.out.println(json);
JsonSystem js = new JsonSystem();
SimpleSystem dom = js.connect("json", json);
if (debug)
js.getStartNode().forAll(SimpleNode.printDebug);
Holder<String> latHolder=new Holder<String>();
dom.g().V().hasLabel("location").forEachRemaining(v->latHolder.add(v.property("lat").value().toString()));
String lat=latHolder.getFirstValue();
if (debug)
System.out.println(lat);
assertTrue(lat.startsWith("50.9412"));
}
Raw Result[edit]
{
"results" : [
{
"address_components" : [
{
"long_name" : "4",
"short_name" : "4",
"types" : [ "street_number" ]
},
{
"long_name" : "Domkloster",
"short_name" : "Domkloster",
"types" : [ "route" ]
},
{
"long_name" : "Innenstadt",
"short_name" : "Innenstadt",
"types" : [ "political", "sublocality", "sublocality_level_1" ]
},
{
"long_name" : "Köln",
"short_name" : "Köln",
"types" : [ "locality", "political" ]
},
{
"long_name" : "Köln",
"short_name" : "K",
"types" : [ "administrative_area_level_2", "political" ]
},
{
"long_name" : "Nordrhein-Westfalen",
"short_name" : "NRW",
"types" : [ "administrative_area_level_1", "political" ]
},
{
"long_name" : "Deutschland",
"short_name" : "DE",
"types" : [ "country", "political" ]
},
{
"long_name" : "50667",
"short_name" : "50667",
"types" : [ "postal_code" ]
}
],
"formatted_address" : "Domkloster 4, 50667 Köln, Deutschland",
"geometry" : {
"location" : {
"lat" : 50.94127839999999,
"lng" : 6.9582814
},
"location_type" : "ROOFTOP",
"viewport" : {
"northeast" : {
"lat" : 50.94262738029149,
"lng" : 6.959630380291502
},
"southwest" : {
"lat" : 50.93992941970849,
"lng" : 6.956932419708497
}
}
},
"place_id" : "ChIJLz2cNqUlv0cRxqnjljiR7Ck",
"types" : [ "church", "establishment", "place_of_worship", "point_of_interest" ]
},
{
"address_components" : [
{
"long_name" : "4",
"short_name" : "4",
"types" : [ "street_number" ]
},
{
"long_name" : "Domkloster",
"short_name" : "Domkloster",
"types" : [ "route" ]
},
{
"long_name" : "Innenstadt",
"short_name" : "Innenstadt",
"types" : [ "political", "sublocality", "sublocality_level_1" ]
},
{
"long_name" : "Köln",
"short_name" : "Köln",
"types" : [ "locality", "political" ]
},
{
"long_name" : "Köln",
"short_name" : "K",
"types" : [ "administrative_area_level_2", "political" ]
},
{
"long_name" : "Nordrhein-Westfalen",
"short_name" : "NRW",
"types" : [ "administrative_area_level_1", "political" ]
},
{
"long_name" : "Deutschland",
"short_name" : "DE",
"types" : [ "country", "political" ]
},
{
"long_name" : "50667",
"short_name" : "50667",
"types" : [ "postal_code" ]
}
],
"formatted_address" : "Domkloster 4, 50667 Köln, Deutschland",
"geometry" : {
"location" : {
"lat" : 50.9412892,
"lng" : 6.958912499999999
},
"location_type" : "ROOFTOP",
"viewport" : {
"northeast" : {
"lat" : 50.9426381802915,
"lng" : 6.960261480291502
},
"southwest" : {
"lat" : 50.9399402197085,
"lng" : 6.957563519708498
}
}
},
"place_id" : "ChIJ-ydP-a8lv0cRfBO-EehI_1s",
"types" : [ "church", "establishment", "place_of_worship", "point_of_interest" ]
}
],
"status" : "OK"
}
SimpleGraph-JSON Maria Fahl , Wolfgang Fahl