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Serialization support with GSON for Guava immutable collections

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package com.baggonius.gson.immutable;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.baggonius.gson.common.ImmutableDeserializerException;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Map;

abstract class BaseMapDeserializer implements JsonDeserializer {
  protected abstract E buildFrom(Map map);

  public E deserialize(JsonElement json, Type type, JsonDeserializationContext context) {

    try {
      Type[] typeArguments = ((ParameterizedType) type).getActualTypeArguments();
      Type parameterizedType = Types.hashMapOf(typeArguments[0], typeArguments[1]).getType();
      Map map = context.deserialize(json, parameterizedType);

      return buildFrom(map);
    } catch (Exception e) {
      throw new ImmutableDeserializerException(e);
    }
  }
}