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Restored this behavior for serialization: (as verified in CustomSerializerTest)

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First preference: a type adapter registered for the runtime type
Second preference: a type adapter registered for the declared type
Third preference: reflective type adapter for the runtime type (if it is a sub class of the declared type)
Fourth preference: reflective type adapter for the declared type
This commit is contained in:
Inderjeet Singh 2011-08-12 02:18:02 +00:00
parent f7121ad87d
commit 57ea7ff9f3
1 changed files with 21 additions and 6 deletions
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27
gson/src/main/java/com/google/gson/internal/bind/TypeAdapterRuntimeTypeWrapper.java
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@ -42,13 +42,28 @@ final class TypeAdapterRuntimeTypeWrapper<T> extends TypeAdapter<T> {
@SuppressWarnings("unchecked")
@Override
public void write(JsonWriter writer, T value) throws IOException {
TypeAdapter t = delegate;
if (delegate instanceof ReflectiveTypeAdapter) {
Type runtimeType = Reflection.getRuntimeTypeIfMoreSpecific(type, value);
if (runtimeType != type) {
t = context.getAdapter(TypeToken.get(runtimeType));
// Order of preference for choosing type adapters
// First preference: a type adapter registered for the runtime type
// Second preference: a type adapter registered for the declared type
// Third preference: reflective type adapter for the runtime type (if it is a sub class of the declared type)
// Fourth preference: reflective type adapter for the declared type
TypeAdapter chosen = delegate;
Type runtimeType = Reflection.getRuntimeTypeIfMoreSpecific(type, value);
if (runtimeType != type) {
TypeAdapter runtimeTypeAdapter = context.getAdapter(TypeToken.get(runtimeType));
if (!(runtimeTypeAdapter instanceof ReflectiveTypeAdapter)) {
// The user registered a type adapter for the runtime type, so we will use that
chosen = runtimeTypeAdapter;
} else if (!(delegate instanceof ReflectiveTypeAdapter)) {
// The user registered a type adapter for Base class, so we prefer it over the
// reflective type adapter for the runtime type
chosen = delegate;
} else {
// Use the type adapter for runtime type
chosen = runtimeTypeAdapter;
}
}
t.write(writer, value);
chosen.write(writer, value);
}
}