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empty array interpreted as empty mailchimp object #25

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empty array interpreted as empty mailchimp object #25

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205 changes: 107 additions & 98 deletions src/main/java/com/ecwid/mailchimp/internal/gson/MailChimpObjectTypeAdapter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -37,102 +37,111 @@
*/
class MailChimpObjectTypeAdapter extends TypeAdapter<MailChimpObject> {

static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() {
@Override
@SuppressWarnings("unchecked")
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
if (MailChimpObject.class.isAssignableFrom(type.getRawType())) {
return (TypeAdapter<T>) new MailChimpObjectTypeAdapter(gson, (TypeToken<MailChimpObject>) type);
} else {
return null;
}
}
};

private final Gson gson;
private final Constructor<? extends MailChimpObject> constructor;

@SuppressWarnings("unchecked")
private MailChimpObjectTypeAdapter(Gson gson, TypeToken<MailChimpObject> type) {
this.gson = gson;

try {
this.constructor = ((Class<? extends MailChimpObject>) type.getRawType()).getDeclaredConstructor();
this.constructor.setAccessible(true);
} catch(NoSuchMethodException e) {
throw new IllegalArgumentException("No no-arg counstructor found in "+type.getRawType());
}
}

@Override
public void write(JsonWriter out, MailChimpObject value) throws IOException {
gson.getAdapter(Map.class).write(out, value);
}

@Override
public MailChimpObject read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}

MailChimpObject result;
try {
result = constructor.newInstance();
} catch(Exception e) {
throw new RuntimeException("Failed to invoke " + constructor + " with no args", e);
}

in.beginObject();
while (in.hasNext()) {
final String key;
if (in.peek() == JsonToken.NAME) {
key = in.nextName();
} else {
key = in.nextString();
}

final Object value;

Type valueType = result.getReflectiveMappingTypes().get(key);
if (valueType != null) {
value = gson.getAdapter(TypeToken.get(valueType)).read(in);
} else {
if (in.peek() == JsonToken.BEGIN_OBJECT) {
value = gson.getAdapter(MailChimpObject.class).read(in);
} else if(in.peek() == JsonToken.BEGIN_ARRAY) {
value = readList(in);
} else {
value = gson.getAdapter(Object.class).read(in);
}
}

if (result.put(key, value) != null) {
throw new JsonSyntaxException("duplicate key: " + key);
}
}
in.endObject();

return result;
}

private List<?> readList(JsonReader in) throws IOException {
List<Object> result = new ArrayList<Object>();
in.beginArray();
while(in.peek() != JsonToken.END_ARRAY) {
final Object element;

if (in.peek() == JsonToken.BEGIN_OBJECT) {
element = gson.getAdapter(MailChimpObject.class).read(in);
} else if(in.peek() == JsonToken.BEGIN_ARRAY) {
element = readList(in);
} else {
element = gson.getAdapter(Object.class).read(in);
}

result.add(element);
}
in.endArray();
return result;
}
static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() {
@Override
@SuppressWarnings("unchecked")
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
if (MailChimpObject.class.isAssignableFrom(type.getRawType())) {
return (TypeAdapter<T>) new MailChimpObjectTypeAdapter(gson, (TypeToken<MailChimpObject>) type);
} else {
return null;
}
}
};

private final Gson gson;
private final Constructor<? extends MailChimpObject> constructor;

@SuppressWarnings("unchecked")
private MailChimpObjectTypeAdapter(Gson gson, TypeToken<MailChimpObject> type) {
this.gson = gson;

try {
this.constructor = ((Class<? extends MailChimpObject>) type.getRawType()).getDeclaredConstructor();
this.constructor.setAccessible(true);
} catch(NoSuchMethodException e) {
throw new IllegalArgumentException("No no-arg counstructor found in "+type.getRawType());
}
}

@Override
public void write(JsonWriter out, MailChimpObject value) throws IOException {
gson.getAdapter(Map.class).write(out, value);
}

@Override
public MailChimpObject read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}

MailChimpObject result;
try {
result = constructor.newInstance();
} catch(Exception e) {
throw new RuntimeException("Failed to invoke " + constructor + " with no args", e);
}

if (in.peek() == JsonToken.BEGIN_ARRAY) {
in.beginArray();
if (in.peek() != JsonToken.END_ARRAY) {
throw new IllegalStateException("Expected empty array as empty mailchimp object.");
}
in.endArray();
return result;
}

in.beginObject();
while (in.hasNext()) {
final String key;
if (in.peek() == JsonToken.NAME) {
key = in.nextName();
} else {
key = in.nextString();
}

final Object value;

Type valueType = result.getReflectiveMappingTypes().get(key);
if (valueType != null) {
value = gson.getAdapter(TypeToken.get(valueType)).read(in);
} else {
if (in.peek() == JsonToken.BEGIN_OBJECT) {
value = gson.getAdapter(MailChimpObject.class).read(in);
} else if(in.peek() == JsonToken.BEGIN_ARRAY) {
value = readList(in);
} else {
value = gson.getAdapter(Object.class).read(in);
}
}

if (result.put(key, value) != null) {
throw new JsonSyntaxException("duplicate key: " + key);
}
}
in.endObject();

return result;
}

private List<?> readList(JsonReader in) throws IOException {
List<Object> result = new ArrayList<Object>();
in.beginArray();
while(in.peek() != JsonToken.END_ARRAY) {
final Object element;

if (in.peek() == JsonToken.BEGIN_OBJECT) {
element = gson.getAdapter(MailChimpObject.class).read(in);
} else if(in.peek() == JsonToken.BEGIN_ARRAY) {
element = readList(in);
} else {
element = gson.getAdapter(Object.class).read(in);
}

result.add(element);
}
in.endArray();
return result;
}
}