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NeoLove Service in Java
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);
}
};
}
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