Created
March 23, 2014 05:49
-
-
Save maxdemarzi/9719281 to your computer and use it in GitHub Desktop.
NeoLove Service in Java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package org.neo4j.example.unmanagedextension; | |
import org.codehaus.jackson.map.ObjectMapper; | |
import org.neo4j.cypher.javacompat.ExecutionEngine; | |
import org.neo4j.cypher.javacompat.ExecutionResult; | |
import org.neo4j.graphdb.*; | |
import org.neo4j.helpers.collection.IteratorUtil; | |
import javax.ws.rs.GET; | |
import javax.ws.rs.Path; | |
import javax.ws.rs.PathParam; | |
import javax.ws.rs.core.Context; | |
import javax.ws.rs.core.Response; | |
import java.io.IOException; | |
import java.util.*; | |
@Path("/service") | |
public class MyService { | |
private static final ObjectMapper objectMapper = new ObjectMapper(); | |
@GET | |
@Path("/helloworld") | |
public String helloWorld() { | |
return "Hello World!"; | |
} | |
@GET | |
@Path("/loves/{name}") | |
public Response getLoves(@PathParam("name") String name, @Context GraphDatabaseService db) throws IOException { | |
List<HashMap<String, Object>> results = new ArrayList<>(); | |
HashSet<Node> people = new HashSet<>(); | |
HashMap<Node, ArrayList<String>> peopleWant = new HashMap<>(); | |
HashMap<Node, ArrayList<String>> peopleHave = new HashMap<>(); | |
try ( Transaction tx = db.beginTx() ) | |
{ | |
final Node user = IteratorUtil.singleOrNull(db.findNodesByLabelAndProperty(Labels.Person, "name", name)); | |
if(user != null) { | |
String myGender = (String) user.getProperty("gender"); | |
String myOrientation = (String) user.getProperty("orientation"); | |
List<String> myWants = new ArrayList<>(); | |
List<String> myHas = new ArrayList<>(); | |
for(Relationship wants : user.getRelationships(RelationshipTypes.WANTS, Direction.OUTGOING)){ | |
myWants.add((String) wants.getEndNode().getProperty("name")); | |
} | |
for(Relationship has : user.getRelationships(RelationshipTypes.HAS, Direction.OUTGOING)){ | |
myHas.add((String) has.getEndNode().getProperty("name")); | |
} | |
for(Relationship lives_in : user.getRelationships(RelationshipTypes.LIVES_IN, Direction.OUTGOING)){ | |
Node location = lives_in.getEndNode(); | |
for(Relationship lives_in_too : location.getRelationships(RelationshipTypes.LIVES_IN, Direction.INCOMING)){ | |
Node person = lives_in_too.getStartNode(); | |
if(person.equals(user)){ | |
continue; | |
} | |
if((myOrientation.equals("straight")) ^ (myGender == person.getProperty("gender") )){ | |
people.add(person); | |
ArrayList<String> theirMatchingWants = new ArrayList<>(); | |
ArrayList<String> theirMatchingHas = new ArrayList<>(); | |
for(Relationship wants : person.getRelationships(RelationshipTypes.WANTS, Direction.OUTGOING)){ | |
String theirWant = (String) wants.getEndNode().getProperty("name"); | |
if(myHas.contains(theirWant)){ | |
theirMatchingWants.add(theirWant); | |
} | |
} | |
for(Relationship has : person.getRelationships(RelationshipTypes.HAS, Direction.OUTGOING)){ | |
String theirHas = (String) has.getEndNode().getProperty("name"); | |
if(myWants.contains(theirHas)){ | |
theirMatchingHas.add(theirHas); | |
} | |
} | |
peopleHave.put(person, theirMatchingHas); | |
peopleWant.put(person, theirMatchingWants); | |
} | |
} | |
String locationName = (String) location.getProperty("name"); | |
for (Node person : people){ | |
if(peopleHave.get(person).size() > 0 && peopleWant.get(person).size() > 0){ | |
HashMap<String, Object> result = new HashMap<>(); | |
result.put("location", locationName); | |
result.put("name", person.getProperty("name")); | |
result.put("my_interests", peopleHave.get(person)); | |
result.put("their_interests", peopleWant.get(person)); | |
result.put("matching_wants", peopleHave.get(person).size()); | |
result.put("matching_has", peopleWant.get(person).size()); | |
results.add(result); | |
} | |
} | |
} | |
} | |
Collections.sort(results, resultComparator); | |
tx.success(); | |
} | |
return Response.ok().entity(objectMapper.writeValueAsString(results.subList(0,Math.min(10, results.size())))).build(); | |
} | |
private static final Comparator<HashMap<String, Object>> resultComparator = new Comparator<HashMap<String, Object>>() { | |
@Override | |
public int compare(HashMap<String, Object> o1, HashMap<String, Object> o2) { | |
double o1Value = ((int) o1.get("matching_wants") / (1.0/ (int) o1.get("matching_has"))); | |
double o2Value = ((int) o2.get("matching_wants") / (1.0/ (int) o2.get("matching_has"))); | |
return (int)(o2Value - o1Value); | |
} | |
}; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment