streams-contrib/streams-provider-twitter/src/main/java/org/apache/streams/twitter/converter/TwitterJsonUserActivityConverter.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
 *
 *   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.streams.twitter.converter;

import org.apache.streams.data.ActivityConverter;
import org.apache.streams.exceptions.ActivityConversionException;
import org.apache.streams.pojo.json.Activity;
import org.apache.streams.twitter.pojo.User;

import org.apache.commons.lang.NotImplementedException;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import static org.apache.streams.twitter.converter.util.TwitterActivityUtil.updateActivity;

public class TwitterJsonUserActivityConverter implements ActivityConverter<User> {

  private static Class requiredClass = User.class;

  @Override
  public Class requiredClass() {
    return requiredClass;
  }

  private static TwitterJsonUserActivityConverter instance = new TwitterJsonUserActivityConverter();

  public static TwitterJsonUserActivityConverter getInstance() {
    return instance;
  }

  @Override
  public String serializationFormat() {
    return null;
  }

  @Override
  public User fromActivity(Activity deserialized) throws ActivityConversionException {
    throw new NotImplementedException();
  }

  @Override
  public List<User> fromActivityList(List<Activity> list) {
    throw new NotImplementedException();
  }


  @Override
  public List<Activity> toActivityList(User user) throws ActivityConversionException {

    Activity activity = new Activity();
    updateActivity(user, activity);

    return Collections.singletonList(activity);
  }

  @Override
  public List<Activity> toActivityList(List<User> serializedList) {
    List<Activity> result = new ArrayList<>();
    for ( User item : serializedList ) {
      try {
        List<Activity> activities = toActivityList(item);
        result.addAll(activities);
      } catch (ActivityConversionException ex) {
        //
      }
    }
    return result;
  }
}