Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package persistance; import business.Bee; import business.Colony; import business.Female; import business.Male; import business.Queen; import com.google.gson.Gson; import com.google.gson.GsonBuilder; import com.google.gson.stream.JsonReader; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.Reader; import java.util.ArrayList; import java.util.Random; /** * * @author gebruiker-pc */ public class JSONHandler { public static ArrayList<Colony> loadColonies(String filePath) throws IOException { ArrayList<Colony> colonies = new ArrayList<>(); try (Reader reader = new InputStreamReader(new FileInputStream(filePath))) { Gson gson = new GsonBuilder().create(); JsonReader jsonReader = gson.newJsonReader(reader); jsonReader.beginArray(); while (jsonReader.hasNext()) { colonies.add(parseColony(jsonReader, colonies)); } jsonReader.endArray(); return colonies; } } private static Bee parseUnspecifiedBee(JsonReader jsonReader) throws IOException { int primaryFertility = 0; double primaryLifespan = 0; double primaryPollination = 0; String primarySpecies = null; double primaryWorkspeed = 0; int secondaryFertility = 0; double secondaryLifespan = 0; double secondaryPollination = 0; String secondarySpecies = null; double secondaryWorkspeed = 0; jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "primaryFertility": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryFertility = jsonReader.nextInt(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "primaryLifespan": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryLifespan = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "primaryPollination": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryPollination = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "primarySpecies": primarySpecies = jsonReader.nextString(); break; case "primaryWorkspeed": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryWorkspeed = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondaryFertility": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryFertility = jsonReader.nextInt(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondaryLifespan": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryLifespan = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondaryPollination": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryPollination = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondarySpecies": secondarySpecies = jsonReader.nextString(); break; case "secondaryWorkspeed": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryWorkspeed = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); Random random = new Random(); if (random.nextInt(50) == 0) { return new Male(primaryFertility, primaryLifespan, primaryPollination, primarySpecies, primaryWorkspeed, secondaryFertility, secondaryLifespan, secondaryPollination, secondarySpecies, secondaryWorkspeed); } return new Female(primaryFertility, primaryLifespan, primaryPollination, primarySpecies, primaryWorkspeed, secondaryFertility, secondaryLifespan, secondaryPollination, secondarySpecies, secondaryWorkspeed); } private static Male parseDrone(JsonReader jsonReader) throws IOException { int primaryFertility = 0; double primaryLifespan = 0; double primaryPollination = 0; String primarySpecies = null; double primaryWorkspeed = 0; int secondaryFertility = 0; double secondaryLifespan = 0; double secondaryPollination = 0; String secondarySpecies = null; double secondaryWorkspeed = 0; jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "primaryFertility": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryFertility = jsonReader.nextInt(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "primaryLifespan": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryLifespan = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "primaryPollination": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryPollination = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "primarySpecies": primarySpecies = jsonReader.nextString(); break; case "primaryWorkspeed": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryWorkspeed = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondaryFertility": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryFertility = jsonReader.nextInt(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondaryLifespan": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryLifespan = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondaryPollination": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryPollination = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondarySpecies": secondarySpecies = jsonReader.nextString(); break; case "secondaryWorkspeed": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryWorkspeed = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); return new Male(primaryFertility, primaryLifespan, primaryPollination, primarySpecies, primaryWorkspeed, secondaryFertility, secondaryLifespan, secondaryPollination, secondarySpecies, secondaryWorkspeed); } private static Female parsePrincess(JsonReader jsonReader) throws IOException { int primaryFertility = 0; double primaryLifespan = 0; double primaryPollination = 0; String primarySpecies = null; double primaryWorkspeed = 0; int secondaryFertility = 0; double secondaryLifespan = 0; double secondaryPollination = 0; String secondarySpecies = null; double secondaryWorkspeed = 0; jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "primaryFertility": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryFertility = jsonReader.nextInt(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "primaryLifespan": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryLifespan = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "primaryPollination": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryPollination = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "primarySpecies": primarySpecies = jsonReader.nextString(); break; case "primaryWorkspeed": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryWorkspeed = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondaryFertility": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryFertility = jsonReader.nextInt(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondaryLifespan": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryLifespan = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondaryPollination": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryPollination = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondarySpecies": secondarySpecies = jsonReader.nextString(); break; case "secondaryWorkspeed": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryWorkspeed = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); return new Female(primaryFertility, primaryLifespan, primaryPollination, primarySpecies, primaryWorkspeed, secondaryFertility, secondaryLifespan, secondaryPollination, secondarySpecies, secondaryWorkspeed); } private static Queen parseQueen(JsonReader jsonReader) throws IOException { int primaryFertility = 0; double primaryLifespan = 0; double primaryPollination = 0; String primarySpecies = null; double primaryWorkspeed = 0; int secondaryFertility = 0; double secondaryLifespan = 0; double secondaryPollination = 0; String secondarySpecies = null; double secondaryWorkspeed = 0; Female princess = null; Male drone = null; jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "drone": drone = parseDrone(jsonReader); break; case "princess": princess = parsePrincess(jsonReader); break; case "primaryFertility": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryFertility = jsonReader.nextInt(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "primaryLifespan": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryLifespan = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "primaryPollination": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryPollination = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "primarySpecies": primarySpecies = jsonReader.nextString(); break; case "primaryWorkspeed": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": primaryWorkspeed = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondaryFertility": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryFertility = jsonReader.nextInt(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondaryLifespan": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryLifespan = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondaryPollination": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryPollination = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; case "secondarySpecies": secondarySpecies = jsonReader.nextString(); break; case "secondaryWorkspeed": jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "modifier": secondaryWorkspeed = jsonReader.nextDouble(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); Queen newQueen = new Queen(primaryFertility, primaryLifespan, primaryPollination, primarySpecies, primaryWorkspeed, secondaryFertility, secondaryLifespan, secondaryPollination, secondarySpecies, secondaryWorkspeed); newQueen.setPrincess(princess); newQueen.setDrone(drone); return newQueen; } private static Colony parseColony(JsonReader jsonReader, ArrayList<Colony> colonies) throws IOException { int year = 0; Queen queen = null; ArrayList<Bee> bees = new ArrayList<>(); Colony parentColony = null; jsonReader.beginObject(); while (jsonReader.hasNext()) { switch (jsonReader.nextName()) { case "year": year = jsonReader.nextInt(); break; case "queen": queen = parseQueen(jsonReader); break; case "parentColony": parentColony = parseColony(jsonReader, colonies); for (Colony colony : colonies) { if (colony.equals(parentColony)) { parentColony = colony; } } break; case "bees": jsonReader.beginArray(); while (jsonReader.hasNext()) { bees.add(parseUnspecifiedBee(jsonReader)); } jsonReader.endArray(); break; default: jsonReader.skipValue(); break; } } jsonReader.endObject(); Colony colony = new Colony(year, queen, bees); if (parentColony != null) { colony.setParentColony(parentColony); parentColony.addChildColony(colony); } return colony; } }