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Added comments and fixed indentation for ModdedEnumTypeAdapter.

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This commit is contained in:
Olof Larsson 2013-11-13 10:48:07 +01:00
parent c746c305a8
commit bb259374e4
2 changed files with 70 additions and 45 deletions
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2
src/com/massivecraft/mcore/MCore.java
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@ -84,7 +84,7 @@ public class MCore extends MPlugin
.registerTypeAdapter(Inventory.class, InventoryAdapter.get())
.registerTypeAdapter(PlayerInventory.class, PlayerInventoryAdapter.get())
.registerTypeAdapter(PS.class, PSAdapter.get())
.registerTypeAdapterFactory(ModdedEnumTypeAdapter.ENUM_FACTORY);
.registerTypeAdapterFactory(ModdedEnumTypeAdapter.ENUM_FACTORY);
}
public static String getServerId() { return ConfServer.serverid; }

111
src/com/massivecraft/mcore/adapter/ModdedEnumTypeAdapter.java
View File

@ -13,52 +13,77 @@ import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
* This type adapter and factory handles modified Java Enums.
* It's based upon: https://github.com/MassiveCraft/mcore/blob/91f9ec7c0c7d9a11a35db905be520f5cf6b6743e/src/com/massivecraft/mcore/xlib/gson/internal/bind/TypeAdapters.java#L670
* The only change is the try-catch around the annotation code.
*
* https://github.com/MassiveCraft/mcore/pull/62
*
* # Problem
* The problem that was occurring is Forge modifies Vanilla Minecraft Enums
* (see https://github.com/MinecraftForge/MinecraftForge/blob/master/common/net/minecraftforge/common/EnumHelper.java)
* the way that it modifies the Enum is pure Java hackery modifying $VALUES on the underlying Enum.
* This will update the calls to Class.getEnumContants but won't update any fields on the Enum.
* So when the built-in Gson EnumTypeAdaper tries to see if any SerializedName annotations are on the fields of the Enum,
* it can't find a field with the new names and throws an exception.
*
* # Reasoning
* There is really not any way that we could put any fix in on the MCPC+ side since we can't add fields to Java enums at runtime.
*
* # Solution
* This ModdedEnumTypeAdapter is basically just a straight copy of the built-in one,
* but ignores when it can't find the field/annotation (which is the desired behavior in this case anyways).
* I tested this with Factions on the latest MCPC+ release and it resolves the issue that was logged.
* Hopefully this will reduce the number of people opening issues on both sides.
* If you have any questions, feel free to hit me up on IRC.
*
* @author OniBait
*/
public final class ModdedEnumTypeAdapter<T extends Enum<T>> extends TypeAdapter<T> {
private final Map<String, T> nameToConstant = new HashMap<String, T>();
private final Map<T, String> constantToName = new HashMap<T, String>();
private final Map<String, T> nameToConstant = new HashMap<String, T>();
private final Map<T, String> constantToName = new HashMap<T, String>();
public ModdedEnumTypeAdapter(Class<T> classOfT) {
for (T constant : classOfT.getEnumConstants()) {
String name = constant.name();
// Ignore when the field can't be found since modified enums won't have it
// which is fine, since it wouldn't have an annotation anyway (how could it?)
try {
SerializedName annotation = classOfT.getField(name).getAnnotation(SerializedName.class);
if (annotation != null) {
name = annotation.value();
}
} catch (NoSuchFieldException ex) {}
nameToConstant.put(name, constant);
constantToName.put(constant, name);
}
}
public T read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
return nameToConstant.get(in.nextString());
}
public ModdedEnumTypeAdapter(Class<T> classOfT) {
for (T constant : classOfT.getEnumConstants()) {
String name = constant.name();
try { // MCore - Ignore when the field can't be found since modified enums won't have it.
SerializedName annotation = classOfT.getField(name).getAnnotation(SerializedName.class);
if (annotation != null) {
name = annotation.value();
}
} catch (NoSuchFieldException ex) {} // MCore
nameToConstant.put(name, constant);
constantToName.put(constant, name);
}
}
public T read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
return nameToConstant.get(in.nextString());
}
public void write(JsonWriter out, T value) throws IOException {
out.value(value == null ? null : constantToName.get(value));
}
public void write(JsonWriter out, T value) throws IOException {
out.value(value == null ? null : constantToName.get(value));
}
public static final TypeAdapterFactory ENUM_FACTORY = newEnumTypeHierarchyFactory();
public static final TypeAdapterFactory ENUM_FACTORY = newEnumTypeHierarchyFactory();
public static <TT> TypeAdapterFactory newEnumTypeHierarchyFactory() {
return new TypeAdapterFactory() {
@SuppressWarnings({"rawtypes", "unchecked"})
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
Class<? super T> rawType = typeToken.getRawType();
if (!Enum.class.isAssignableFrom(rawType) || rawType == Enum.class) {
return null;
}
if (!rawType.isEnum()) {
rawType = rawType.getSuperclass(); // handle anonymous subclasses
}
return (TypeAdapter<T>) new ModdedEnumTypeAdapter(rawType);
}
};
}
public static <TT> TypeAdapterFactory newEnumTypeHierarchyFactory() {
return new TypeAdapterFactory() {
@SuppressWarnings({"rawtypes", "unchecked"})
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
Class<? super T> rawType = typeToken.getRawType();
if (!Enum.class.isAssignableFrom(rawType) || rawType == Enum.class) {
return null;
}
if (!rawType.isEnum()) {
rawType = rawType.getSuperclass(); // handle anonymous subclasses
}
return (TypeAdapter<T>) new ModdedEnumTypeAdapter(rawType);
}
};
}
}