twill-core/src/main/java/org/apache/twill/internal/json/LogThrowableCodec.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.twill.internal.json;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import org.apache.twill.api.logging.LogThrowable;

import java.lang.reflect.Type;

/**
 * Gson codec for {@link LogThrowable}.
 */
public final class LogThrowableCodec implements JsonSerializer<LogThrowable>, JsonDeserializer<LogThrowable> {

  @Override
  public JsonElement serialize(LogThrowable throwable, Type typeOfSrc, JsonSerializationContext context) {
    JsonObject json = new JsonObject();
    json.addProperty("className", throwable.getClassName());
    json.addProperty("message", throwable.getMessage());
    json.add("stackTraces", context.serialize(throwable.getStackTraces(), StackTraceElement[].class));

    LogThrowable cause = throwable.getCause();
    if (cause != null) {
      json.add("cause", context.serialize(cause, LogThrowable.class));
    }

    return json;
  }

  @Override
  public LogThrowable deserialize(JsonElement json, Type typeOfT,
                                  JsonDeserializationContext context) throws JsonParseException {
    return context.deserialize(json, DefaultLogThrowable.class);
  }
}