net.mograsim.logic.model/src/net/mograsim/logic/model/util/JsonHandler.java

   1 package net.mograsim.logic.model.util;
   2
   3 import java.io.BufferedReader;
   4 import java.io.FileInputStream;
   5 import java.io.FileWriter;
   6 import java.io.IOException;
   7 import java.io.InputStream;
   8 import java.io.InputStreamReader;
   9 import java.util.stream.Collectors;
  10
  11 import com.google.gson.Gson;
  12 import com.google.gson.GsonBuilder;
  13 import com.google.gson.JsonElement;
  14
  15 public class JsonHandler
  16 {
  17         // TODO: write versions differently
  18         private static Gson parser = new GsonBuilder().setPrettyPrinting().create();
  19
  20         public static <T> T readJson(String path, Class<T> type) throws IOException
  21         {
  22                 try (FileInputStream jsonStream = new FileInputStream(path))
  23                 {
  24                         return readJson(jsonStream, type);
  25                 }
  26         }
  27
  28         /**
  29          * @param input The Stream is closed after being read
  30          */
  31         public static <T> T readJson(InputStream input, Class<T> type) throws IOException
  32         {
  33                 try (InputStreamReader reader = new InputStreamReader(input); BufferedReader bf = new BufferedReader(reader))
  34                 {
  35                         return fromJson(bf.lines().collect(Collectors.joining("\n")), type);
  36                 }
  37         }
  38
  39         public static <T> T fromJson(String src, Class<T> type)
  40         {
  41                 // TODO actually parse and compare version
  42                 String rawJson = src.lines().dropWhile(s -> s.length() == 0 || s.charAt(0) != '{').collect(Collectors.joining());
  43                 return parser.fromJson(rawJson, type);
  44         }
  45
  46         public static void writeJson(Object o, String path) throws IOException
  47         {
  48                 try (FileWriter writer = new FileWriter(path))
  49                 {
  50                         writer.write(toJson(o));
  51                 }
  52         }
  53
  54         public static String toJson(Object o)
  55         {
  56                 return String.format("mograsim version: %s\n%s", Version.jsonCompVersion.toString(), parser.toJson(o));
  57         }
  58
  59         public static JsonElement toJsonTree(Object o)
  60         {
  61                 return parser.toJsonTree(o);
  62         }
  63 }