src/main/java/com/irtimaled/bbor/client/config/Configuration.java

   1 package com.irtimaled.bbor.client.config;
   2
   3 import com.google.common.io.Files;
   4
   5 import java.io.*;
   6 import java.nio.charset.StandardCharsets;
   7 import java.util.HashMap;
   8 import java.util.List;
   9 import java.util.Map;
  10
  11 class Configuration {
  12     private static final String FALLBACK_CATEGORY = "features";
  13     private final File file;
  14
  15     Configuration(File file) {
  16         this.file = file;
  17     }
  18
  19     void save() {
  20         try (Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file), StandardCharsets.UTF_8))) {
  21             writer.write("# Configuration file\n");
  22             for (String category : settingsGroup.keySet()) {
  23                 writer.write("\n");
  24                 writer.write(String.format("%s {\n", category));
  25                 Map<String, Setting<?>> settings = settingsGroup.get(category);
  26                 boolean first = true;
  27                 for (String settingName : settings.keySet()) {
  28                     if (!first)
  29                         writer.write("\n");
  30                     first = false;
  31                     Setting setting = settings.get(settingName);
  32                     writer.write(String.format("    # %s\n", setting.comment));
  33                     writer.write(String.format("    %s:%s=%s\n", setting.getType(), settingName, setting.get()));
  34                 }
  35                 writer.write("}\n");
  36             }
  37         } catch (IOException ignored) {
  38         }
  39     }
  40
  41     private final Map<String, Map<String, Setting<?>>> settingsGroup = new HashMap<>();
  42
  43     void load() {
  44         try {
  45             List<String> lines = Files.readLines(file, StandardCharsets.UTF_8);
  46             String category = null;
  47             String lastCommentLine = null;
  48             for (String line : lines) {
  49                 String trimmedLine = line.trim();
  50                 if (trimmedLine.isEmpty()) {
  51                     continue;
  52                 }
  53                 if (trimmedLine.startsWith("#")) {
  54                     lastCommentLine = trimmedLine.substring(1).trim();
  55                     continue;
  56                 }
  57                 if (trimmedLine.equals("}")) {
  58                     category = null;
  59                     continue;
  60                 }
  61                 if (category == null && trimmedLine.endsWith("{")) {
  62                     category = trimmedLine.substring(0, trimmedLine.length() - 1).trim();
  63                     settingsGroup.put(category, new HashMap<>());
  64                     continue;
  65                 }
  66                 if (category != null) {
  67                     String[] items = trimmedLine.split("[:=]");
  68                     char type = items[0].charAt(0);
  69                     String name = items[1];
  70                     String stringValue = items[2];
  71                     Setting setting = getTypedSetting(type, stringValue);
  72                     setting.comment = lastCommentLine;
  73                     settingsGroup.get(category).put(name, setting);
  74                 }
  75             }
  76         } catch (IOException ignored) {
  77         }
  78     }
  79
  80     private Setting<?> getTypedSetting(char type, String value) {
  81         switch (type) {
  82             case 'I':
  83                 return new Setting<>(type, Integer.parseInt(value));
  84             case 'B':
  85                 return new Setting<>(type, value.equals("1") || value.toLowerCase().equals("true"));
  86         }
  87         return new Setting<>(type, value);
  88     }
  89
  90     <T> Setting<T> get(String category, String settingName, T defaultValue) {
  91         char type = getType(defaultValue);
  92         if (!settingsGroup.containsKey(category)) {
  93             settingsGroup.put(category, new HashMap<>());
  94         }
  95         Map<String, Setting<?>> settings = settingsGroup.get(category);
  96         Setting<?> setting = settings.get(settingName);
  97         if (setting == null && !category.equals(FALLBACK_CATEGORY))
  98             setting = getFallbackSetting(settingName, settings);
  99         if (setting != null && setting.getType() != type) {
 100             setting = null;
 101         }
 102         if (setting == null) {
 103             settings.put(settingName, setting = new Setting<>(type, defaultValue));
 104         }
 105         return (Setting<T>) setting;
 106     }
 107
 108     private Setting<?> getFallbackSetting(String settingName, Map<String, Setting<?>> settings) {
 109         Map<String, Setting<?>> fallbackSettings = settingsGroup.get(FALLBACK_CATEGORY);
 110         if (fallbackSettings == null) return null;
 111
 112         Setting<?> setting = fallbackSettings.get(settingName);
 113         if (setting != null) {
 114             fallbackSettings.remove(settingName);
 115             settings.put(settingName, setting);
 116         }
 117         return setting;
 118     }
 119
 120     private <T> char getType(T defaultValue) {
 121         String[] typeNames = defaultValue.getClass().getName().split("[.]");
 122         return typeNames[typeNames.length - 1].charAt(0);
 123     }
 124
 125     void put(Setting<?> setting) {
 126         String category = setting.category;
 127         if (!settingsGroup.containsKey(category)) {
 128             settingsGroup.put(category, new HashMap<>());
 129         }
 130         Map<String, Setting<?>> settings = settingsGroup.get(category);
 131         settings.put(setting.name, setting);
 132     }
 133 }