/
Unwrap.java
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/
Unwrap.java
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/*
* Copyright (C) 2017 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.squareup.moshi.recipes;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import com.squareup.moshi.JsonAdapter;
import com.squareup.moshi.JsonQualifier;
import com.squareup.moshi.JsonReader;
import com.squareup.moshi.JsonWriter;
import com.squareup.moshi.Moshi;
import com.squareup.moshi.Types;
import com.squareup.moshi.recipes.Unwrap.EnvelopeJsonAdapter.Enveloped;
import com.squareup.moshi.recipes.models.Card;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import java.lang.reflect.Type;
import java.util.Set;
import javax.annotation.Nullable;
final class Unwrap {
private Unwrap() {}
public static void main(String[] args) throws Exception {
String json =
""
+ "{\"data\":"
+ " {\n"
+ " \"rank\": \"4\",\n"
+ " \"suit\": \"CLUBS\"\n"
+ " }"
+ "}";
Moshi moshi = new Moshi.Builder().add(EnvelopeJsonAdapter.FACTORY).build();
JsonAdapter<Card> adapter = moshi.adapter(Card.class, Enveloped.class);
Card out = adapter.fromJson(json);
System.out.println(out);
}
public static final class EnvelopeJsonAdapter extends JsonAdapter<Object> {
public static final JsonAdapter.Factory FACTORY =
new Factory() {
@Override
public @Nullable JsonAdapter<?> create(
Type type, Set<? extends Annotation> annotations, Moshi moshi) {
Set<? extends Annotation> delegateAnnotations =
Types.nextAnnotations(annotations, Enveloped.class);
if (delegateAnnotations == null) {
return null;
}
Type envelope =
Types.newParameterizedTypeWithOwner(
EnvelopeJsonAdapter.class, Envelope.class, type);
JsonAdapter<Envelope<?>> delegate =
moshi.nextAdapter(this, envelope, delegateAnnotations);
return new EnvelopeJsonAdapter(delegate);
}
};
@Retention(RUNTIME)
@JsonQualifier
public @interface Enveloped {}
private static final class Envelope<T> {
final T data;
Envelope(T data) {
this.data = data;
}
}
private final JsonAdapter<Envelope<?>> delegate;
EnvelopeJsonAdapter(JsonAdapter<Envelope<?>> delegate) {
this.delegate = delegate;
}
@Override
public Object fromJson(JsonReader reader) throws IOException {
return delegate.fromJson(reader).data;
}
@Override
public void toJson(JsonWriter writer, Object value) throws IOException {
delegate.toJson(writer, new Envelope<>(value));
}
}
}