67 lines
2.1 KiB
Java
67 lines
2.1 KiB
Java
/*
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* Copyright (C) 2012 Google Inc.
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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.interceptors;
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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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import java.io.IOException;
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/** A type adapter factory that implements {@code @Intercept}. */
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public final class InterceptorFactory implements TypeAdapterFactory {
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@Override
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public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
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Intercept intercept = type.getRawType().getAnnotation(Intercept.class);
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if (intercept == null) {
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return null;
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}
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TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
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return new InterceptorAdapter<>(delegate, intercept);
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}
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static class InterceptorAdapter<T> extends TypeAdapter<T> {
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private final TypeAdapter<T> delegate;
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private final JsonPostDeserializer<T> postDeserializer;
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@SuppressWarnings("unchecked") // ?
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public InterceptorAdapter(TypeAdapter<T> delegate, Intercept intercept) {
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try {
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this.delegate = delegate;
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this.postDeserializer = intercept.postDeserialize().getDeclaredConstructor().newInstance();
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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@Override
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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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@Override
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public T read(JsonReader in) throws IOException {
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T result = delegate.read(in);
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postDeserializer.postDeserialize(result);
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return result;
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}
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}
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}
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