2016-09-17 02:35:34 +02:00
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/*
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* Copyright (C) 2016 Gson Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson.typeadapters;
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import java.io.IOException;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import javax.annotation.PostConstruct;
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import com.google.gson.Gson;
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import com.google.gson.TypeAdapter;
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import com.google.gson.TypeAdapterFactory;
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import com.google.gson.reflect.TypeToken;
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import com.google.gson.stream.JsonReader;
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import com.google.gson.stream.JsonWriter;
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public class PostConstructAdapterFactory implements TypeAdapterFactory {
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// copied from https://gist.github.com/swankjesse/20df26adaf639ed7fd160f145a0b661a
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@Override
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public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
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2017-06-20 03:04:19 +02:00
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for (Class<?> t = type.getRawType(); (t != Object.class) && (t.getSuperclass() != null); t = t.getSuperclass()) {
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2016-09-17 02:35:34 +02:00
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for (Method m : t.getDeclaredMethods()) {
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if (m.isAnnotationPresent(PostConstruct.class)) {
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m.setAccessible(true);
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TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
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return new PostConstructAdapter<T>(delegate, m);
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}
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}
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}
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return null;
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}
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final static class PostConstructAdapter<T> extends TypeAdapter<T> {
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private final TypeAdapter<T> delegate;
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private final Method method;
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public PostConstructAdapter(TypeAdapter<T> delegate, Method method) {
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this.delegate = delegate;
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this.method = method;
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}
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@Override public T read(JsonReader in) throws IOException {
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T result = delegate.read(in);
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if (result != null) {
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try {
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method.invoke(result);
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} catch (IllegalAccessException e) {
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throw new AssertionError();
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} catch (InvocationTargetException e) {
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if (e.getCause() instanceof RuntimeException) throw (RuntimeException) e.getCause();
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throw new RuntimeException(e.getCause());
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}
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}
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return result;
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}
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@Override public void write(JsonWriter out, T value) throws IOException {
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delegate.write(out, value);
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}
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}
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2017-06-20 03:04:19 +02:00
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}
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