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PostConstructAdapterFactory.java
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PostConstructAdapterFactory.java
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/*
* Copyright (C) 2016 Gson Authors
*
* 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
*
* http://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.google.gson.typeadapters;
import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.annotation.PostConstruct;
public class PostConstructAdapterFactory implements TypeAdapterFactory {
// copied from https://gist.github.com/swankjesse/20df26adaf639ed7fd160f145a0b661a
@Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
for (Class<?> t = type.getRawType(); (t != Object.class) && (t.getSuperclass() != null); t = t.getSuperclass()) {
for (Method m : t.getDeclaredMethods()) {
if (m.isAnnotationPresent(PostConstruct.class)) {
m.setAccessible(true);
TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
return new PostConstructAdapter<>(delegate, m);
}
}
}
return null;
}
final static class PostConstructAdapter<T> extends TypeAdapter<T> {
private final TypeAdapter<T> delegate;
private final Method method;
public PostConstructAdapter(TypeAdapter<T> delegate, Method method) {
this.delegate = delegate;
this.method = method;
}
@Override public T read(JsonReader in) throws IOException {
T result = delegate.read(in);
if (result != null) {
try {
method.invoke(result);
} catch (IllegalAccessException e) {
throw new AssertionError();
} catch (InvocationTargetException e) {
if (e.getCause() instanceof RuntimeException) throw (RuntimeException) e.getCause();
throw new RuntimeException(e.getCause());
}
}
return result;
}
@Override public void write(JsonWriter out, T value) throws IOException {
delegate.write(out, value);
}
}
}