Add extra properties to mcmod.info (#497)

Author: kappa-maintainer

src/main/java/net/minecraftforge/fml/common/MetadataCollection.java

@@ -43,9 +43,8 @@
 
 public class MetadataCollection
 {
-    private String modListVersion;
     private ModMetadata[] modList;
-    private Map<String, ModMetadata> metadatas = Maps.newHashMap();
+    private final Map<String, ModMetadata> metadatas = Maps.newHashMap();
 
     public static MetadataCollection from(@Nullable InputStream inputStream, String sourceName)
     {
@@ -59,8 +58,7 @@ public static MetadataCollection from(@Nullable InputStream inputStream, String
         {
             MetadataCollection collection;
             Gson gson = new GsonBuilder().registerTypeAdapter(ArtifactVersion.class, new ArtifactVersionAdapter()).create();
-            JsonParser parser = new JsonParser();
-            JsonElement rootElement = parser.parse(reader);
+            JsonElement rootElement = JsonParser.parseReader(reader);
             if (rootElement.isJsonArray())
             {
                 collection = new MetadataCollection();

src/main/java/net/minecraftforge/fml/common/ModMetadata.java

@@ -19,7 +19,9 @@
 
 package net.minecraftforge.fml.common;
 
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Set;
 
 import net.minecraftforge.fml.common.versioning.ArtifactVersion;
@@ -64,6 +66,14 @@ public class ModMetadata
     public Set<ArtifactVersion> requiredMods = Sets.newHashSet();
     public List<ArtifactVersion> dependencies = Lists.newArrayList();
     public List<ArtifactVersion> dependants = Lists.newArrayList();
+    /**
+     * Use for extra data, should write it like
+     *   "modProperties": {
+     *       "keyA": "valueA",
+     *       "keyB": "valueB"
+     *   }
+     */
+    public Map<String, String> modProperties = HashMap.newHashMap(5);
     // this field is not for use in the json
     public transient boolean autogenerated;