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Specify precedence when a subtype has multiple labels

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This commit is contained in:
Jesse Wilson
2019-10-26 22:57:00 -04:00
parent 537b22f1c3
commit 02cf66f129
2 changed files with 12 additions and 9 deletions
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3
adapters/src/main/java/com/squareup/moshi/adapters/PolymorphicJsonAdapterFactory.java
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@@ -100,7 +100,8 @@ import javax.annotation.Nullable;
* *
* <p>If an unknown subtype is encountered when decoding, this will throw a {@link * <p>If an unknown subtype is encountered when decoding, this will throw a {@link
* JsonDataException}. If an unknown type is encountered when encoding, this will throw an {@link * JsonDataException}. If an unknown type is encountered when encoding, this will throw an {@link
* IllegalArgumentException}. * IllegalArgumentException}. If the same subtype has multiple labels the first one is used when
* encoding.
* *
* <p>If you want to specify a custom unknown fallback for decoding, you can do so via * <p>If you want to specify a custom unknown fallback for decoding, you can do so via
* {@link #withDefaultValue(Object)}. This instance should be immutable, as it is shared. * {@link #withDefaultValue(Object)}. This instance should be immutable, as it is shared.

18
adapters/src/test/java/com/squareup/moshi/adapters/PolymorphicJsonAdapterFactoryTest.java
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@@ -160,7 +160,7 @@ public final class PolymorphicJsonAdapterFactoryTest {
assertThat(reader.peek()).isEqualTo(JsonReader.Token.END_DOCUMENT); assertThat(reader.peek()).isEqualTo(JsonReader.Token.END_DOCUMENT);
} }
@Test public void nonUniqueSubtypes() throws IOException { @Test public void nonUniqueSubtypes() throws IOException {
Moshi moshi = new Moshi.Builder() Moshi moshi = new Moshi.Builder()
.add(PolymorphicJsonAdapterFactory.of(Message.class, "type") .add(PolymorphicJsonAdapterFactory.of(Message.class, "type")
.withSubtype(Success.class, "success") .withSubtype(Success.class, "success")
@@ -168,14 +168,16 @@ public final class PolymorphicJsonAdapterFactoryTest {
.withSubtype(Error.class, "error")) .withSubtype(Error.class, "error"))
.build(); .build();
JsonAdapter<Message> adapter = moshi.adapter(Message.class); JsonAdapter<Message> adapter = moshi.adapter(Message.class);
assertThat(adapter.fromJson("{\"type\":\"success\",\"value\":\"Okay!\"}")) assertThat(adapter.fromJson("{\"type\":\"success\",\"value\":\"Okay!\"}"))
.isEqualTo(new Success("Okay!")); .isEqualTo(new Success("Okay!"));
assertThat(adapter.fromJson("{\"type\":\"data\",\"value\":\"Data!\"}")) assertThat(adapter.fromJson("{\"type\":\"data\",\"value\":\"Data!\"}"))
.isEqualTo(new Success("Data!")); .isEqualTo(new Success("Data!"));
assertThat(adapter.fromJson("{\"type\":\"error\",\"error_logs\":{\"order\":66}}")) assertThat(adapter.fromJson("{\"type\":\"error\",\"error_logs\":{\"order\":66}}"))
.isEqualTo(new Error(Collections.<String, Object>singletonMap("order", 66d))); .isEqualTo(new Error(Collections.<String, Object>singletonMap("order", 66d)));
assertThat(adapter.toJson(new Success("Data!")))
.isEqualTo("{\"type\":\"success\",\"value\":\"Data!\"}");
} }
@Test public void uniqueLabels() { @Test public void uniqueLabels() {