twill-core/src/main/java/org/apache/twill/internal/json/LocalFileCodec.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.LocalFile;
import org.apache.twill.internal.DefaultLocalFile;

import java.lang.reflect.Type;
import java.net.URI;

/**
 *
 */
public final class LocalFileCodec implements JsonSerializer<LocalFile>, JsonDeserializer<LocalFile> {

  @Override
  public JsonElement serialize(LocalFile src, Type typeOfSrc, JsonSerializationContext context) {
    JsonObject json = new JsonObject();

    json.addProperty("name", src.getName());
    json.addProperty("uri", src.getURI().toASCIIString());
    json.addProperty("lastModified", src.getLastModified());
    json.addProperty("size", src.getSize());
    json.addProperty("archive", src.isArchive());
    json.addProperty("pattern", src.getPattern());

    return json;
  }

  @Override
  public LocalFile deserialize(JsonElement json, Type typeOfT,
                               JsonDeserializationContext context) throws JsonParseException {
    JsonObject jsonObj = json.getAsJsonObject();

    String name = jsonObj.get("name").getAsString();
    URI uri = URI.create(jsonObj.get("uri").getAsString());
    long lastModified = jsonObj.get("lastModified").getAsLong();
    long size = jsonObj.get("size").getAsLong();
    boolean archive = jsonObj.get("archive").getAsBoolean();
    JsonElement pattern = jsonObj.get("pattern");

    return new DefaultLocalFile(name, uri, lastModified, size,
                                archive, (pattern == null || pattern.isJsonNull()) ? null : pattern.getAsString());
  }
}