Better handling of Throwable in Gson
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@ -4,42 +4,33 @@ import com.google.gson.JsonArray;
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import com.google.gson.JsonDeserializationContext;
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import com.google.gson.JsonDeserializer;
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import com.google.gson.JsonElement;
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import com.google.gson.JsonIOException;
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import com.google.gson.JsonObject;
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import com.google.gson.JsonParseException;
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import com.google.gson.JsonSerializationContext;
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import com.google.gson.JsonSerializer;
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import com.google.gson.JsonSyntaxException;
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import com.google.gson.TypeAdapterFactory;
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import com.google.gson.internal.bind.TreeTypeAdapter;
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import com.google.gson.stream.MalformedJsonException;
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import fr.pandacube.lib.util.Log;
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import fr.pandacube.lib.util.ThrowableUtil;
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import java.io.IOException;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Type;
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import java.sql.SQLException;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.NoSuchElementException;
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import java.util.concurrent.CancellationException;
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import java.util.concurrent.CompletionException;
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import java.util.concurrent.ExecutionException;
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import java.util.function.BiFunction;
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import java.util.function.Function;
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/* package */ class ThrowableAdapter implements JsonSerializer<Throwable>, JsonDeserializer<Throwable> {
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/**
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* Gson Adapter that handles serialization and deserialization of {@link Throwable} instances properly.
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*/
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public class ThrowableAdapter implements JsonSerializer<Throwable>, JsonDeserializer<Throwable> {
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public static final TypeAdapterFactory FACTORY = TreeTypeAdapter.newTypeHierarchyFactory(Throwable.class, new ThrowableAdapter());
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/* package */ static final TypeAdapterFactory FACTORY = TreeTypeAdapter.newTypeHierarchyFactory(Throwable.class, new ThrowableAdapter());
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private static final Map<Class<? extends Throwable>, ThrowableSubAdapter<?>> subAdapters = Collections.synchronizedMap(new HashMap<>());
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public static <T extends Throwable> void registerSubAdapter(Class<T> clazz, ThrowableSubAdapter<T> subAdapter) {
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subAdapters.put(clazz, subAdapter);
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}
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@Override
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public Throwable deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
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@ -52,18 +43,7 @@ import java.util.function.Function;
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// handle types
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Throwable t = null;
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if (obj.has("types") && obj.get("types").isJsonArray()) {
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for (JsonElement clNameEl : obj.getAsJsonArray("types")) {
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String clName = clNameEl.getAsString();
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try {
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Class<?> cl = Class.forName(clName);
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synchronized (subAdapters) {
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if (subAdapters.containsKey(cl)) {
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t = subAdapters.get(cl).constructor.apply(message, cause);
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break;
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}
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}
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} catch (ReflectiveOperationException ignore) { }
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}
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t = instanciate(obj.getAsJsonArray("types"), message, cause);
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}
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if (t == null) {
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t = new Throwable(message, cause);
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@ -136,13 +116,91 @@ import java.util.function.Function;
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public static class ThrowableSubAdapter<T extends Throwable> {
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public final BiFunction<String, Throwable, T> constructor;
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private static final Map<Class<? extends Throwable>, ThrowableSubAdapter<?>> subAdapters = Collections.synchronizedMap(new HashMap<>());
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/**
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* Register a new adapter for a specific {@link Throwable} subclass.
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* @param clazz the type handled by the specified sub-adapter.
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* @param subAdapter the sub-adapter.
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* @param <T> the type.
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*/
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public static <T extends Throwable> void registerSubAdapter(Class<T> clazz, ThrowableSubAdapter<T> subAdapter) {
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subAdapters.put(clazz, subAdapter);
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}
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private static <T extends Throwable> ThrowableSubAdapter<T> defaultSubAdapter(Class<T> clazz) {
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BiFunction<String, Throwable, T> constructor = null;
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// try (String, Throwable) constructor
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try {
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Constructor<T> constr = clazz.getConstructor(String.class, Throwable.class);
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if (constr.canAccess(null)) {
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constructor = (m, t) -> ThrowableUtil.wrapReflectEx(() -> constr.newInstance(m, t));
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}
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} catch (ReflectiveOperationException ignore) { }
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// try (String) constructor
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try {
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Constructor<T> constr = clazz.getConstructor(String.class);
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if (constr.canAccess(null)) {
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constructor = ThrowableSubAdapter.messageOnly((m) -> ThrowableUtil.wrapReflectEx(() -> constr.newInstance(m)));
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}
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} catch (ReflectiveOperationException ignore) { }
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if (constructor == null) {
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Log.warning("Provided Throwable class '" + clazz + "' does not have any of those constructors or are not accessible: (String, Throwable), (String).");
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return null;
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}
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return new ThrowableSubAdapter<>(constructor);
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}
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private Throwable instanciate(JsonArray types, String message, Throwable cause) {
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Throwable t = null;
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for (JsonElement clNameEl : types) {
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String clName = clNameEl.getAsString();
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try {
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@SuppressWarnings("unchecked")
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Class<? extends Throwable> cl = (Class<? extends Throwable>) Class.forName(clName);
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ThrowableSubAdapter<? extends Throwable> subAdapter = subAdapters.get(cl);
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if (subAdapter == null)
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subAdapter = defaultSubAdapter(cl);
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if (subAdapter != null) {
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t = subAdapter.constructor.apply(message, cause);
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break;
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}
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} catch (ReflectiveOperationException ignore) { }
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}
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return t;
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}
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/**
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* Adapter for specific subclasses of {@link Throwable}.
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* @param <T> the type handled by this adapter.
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*/
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public static class ThrowableSubAdapter<T extends Throwable> {
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private final BiFunction<String, Throwable, T> constructor;
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/**
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* Creates a new adapter for a {@link Throwable}.
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* @param constructor function that will construct a new throwable of the handled type, with prefilled message and cause if possible.
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*/
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protected ThrowableSubAdapter(BiFunction<String, Throwable, T> constructor) {
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this.constructor = constructor;
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}
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/**
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* Utiliy method to use on {@link Throwable} class that only have a message (no cause) constructor.
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* @param constructorWithMessage function that will construct a new throwable, with prefilled message.
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* @return a function that will construct a throwable using the provided function, then will try to init the cause of the throwable.
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* @param <T> the type of the constructed {@link Throwable}.
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*/
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public static <T extends Throwable> BiFunction<String, Throwable, T> messageOnly(Function<String, T> constructorWithMessage) {
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return (m, t) -> {
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T inst = constructorWithMessage.apply(m);
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@ -155,43 +213,4 @@ import java.util.function.Function;
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}
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static {
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// java.lang
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registerSubAdapter(Throwable.class, new ThrowableSubAdapter<>(Throwable::new));
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registerSubAdapter(Error.class, new ThrowableSubAdapter<>(Error::new));
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registerSubAdapter(OutOfMemoryError.class, new ThrowableSubAdapter<>(ThrowableSubAdapter.messageOnly(OutOfMemoryError::new)));
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registerSubAdapter(StackOverflowError.class, new ThrowableSubAdapter<>(ThrowableSubAdapter.messageOnly(StackOverflowError::new)));
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registerSubAdapter(Exception.class, new ThrowableSubAdapter<>(Exception::new));
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registerSubAdapter(RuntimeException.class, new ThrowableSubAdapter<>(RuntimeException::new));
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registerSubAdapter(NullPointerException.class, new ThrowableSubAdapter<>(ThrowableSubAdapter.messageOnly(NullPointerException::new)));
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registerSubAdapter(IndexOutOfBoundsException.class, new ThrowableSubAdapter<>(ThrowableSubAdapter.messageOnly(IndexOutOfBoundsException::new)));
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registerSubAdapter(IllegalArgumentException.class, new ThrowableSubAdapter<>(IllegalArgumentException::new));
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registerSubAdapter(IllegalStateException.class, new ThrowableSubAdapter<>(IllegalStateException::new));
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registerSubAdapter(SecurityException.class, new ThrowableSubAdapter<>(SecurityException::new));
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registerSubAdapter(ReflectiveOperationException.class, new ThrowableSubAdapter<>(ReflectiveOperationException::new));
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registerSubAdapter(UnsupportedOperationException.class, new ThrowableSubAdapter<>(UnsupportedOperationException::new));
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registerSubAdapter(InterruptedException.class, new ThrowableSubAdapter<>(ThrowableSubAdapter.messageOnly(InterruptedException::new)));
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// java.io
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registerSubAdapter(IOException.class, new ThrowableSubAdapter<>(IOException::new));
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// java.sql
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registerSubAdapter(SQLException.class, new ThrowableSubAdapter<>(SQLException::new));
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// java.util
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registerSubAdapter(NoSuchElementException.class, new ThrowableSubAdapter<>(NoSuchElementException::new));
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// java.util.concurrent
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registerSubAdapter(CancellationException.class, new ThrowableSubAdapter<>(ThrowableSubAdapter.messageOnly(CancellationException::new)));
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registerSubAdapter(ExecutionException.class, new ThrowableSubAdapter<>(ExecutionException::new));
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registerSubAdapter(CompletionException.class, new ThrowableSubAdapter<>(CompletionException::new));
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// gson
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registerSubAdapter(JsonIOException.class, new ThrowableSubAdapter<>(JsonIOException::new));
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registerSubAdapter(JsonParseException.class, new ThrowableSubAdapter<>(JsonParseException::new));
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registerSubAdapter(JsonSyntaxException.class, new ThrowableSubAdapter<>(JsonSyntaxException::new));
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registerSubAdapter(MalformedJsonException.class, new ThrowableSubAdapter<>(MalformedJsonException::new));
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}
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}
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