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