50 lines
1.5 KiB
Java
50 lines
1.5 KiB
Java
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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/**
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* A type adapter factory that implements {@code @Intercept}.
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*/
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public final class InterceptorFactory implements TypeAdapterFactory {
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@Override 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().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 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 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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