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