com.youtube.processor.YoutubeTypeConverter.java Source code

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Here is the source code for com.youtube.processor.YoutubeTypeConverter.java

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/*
 * 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 com.youtube.processor;

import com.fasterxml.jackson.databind.module.SimpleModule;
import com.google.api.services.youtube.model.Channel;
import com.google.api.services.youtube.model.Video;
import com.google.common.collect.Lists;
import com.youtube.serializer.YoutubeActivityUtil;
import com.youtube.serializer.YoutubeChannelDeserializer;
import com.youtube.serializer.YoutubeEventClassifier;
import com.youtube.serializer.YoutubeVideoDeserializer;
import org.apache.commons.lang.NotImplementedException;
import org.apache.streams.core.StreamsDatum;
import org.apache.streams.core.StreamsProcessor;
import org.apache.streams.jackson.StreamsJacksonMapper;
import org.apache.streams.pojo.json.Activity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;
import java.util.Queue;

public class YoutubeTypeConverter implements StreamsProcessor {
    public final static String STREAMS_ID = "YoutubeTypeConverter";

    private final static Logger LOGGER = LoggerFactory.getLogger(YoutubeTypeConverter.class);
    private StreamsJacksonMapper mapper;
    private Queue<Video> inQueue;
    private Queue<StreamsDatum> outQueue;
    private YoutubeActivityUtil youtubeActivityUtil;
    private int count = 0;

    public YoutubeTypeConverter() {
    }

    @Override
    public List<StreamsDatum> process(StreamsDatum streamsDatum) {
        StreamsDatum result = null;

        try {
            Object item = streamsDatum.getDocument();

            LOGGER.debug("{} processing {}", STREAMS_ID, item.getClass());
            Activity activity = null;

            if (item instanceof String) {
                item = deserializeItem(item);
            }

            if (item instanceof Video) {
                activity = new Activity();
                youtubeActivityUtil.updateActivity((Video) item, activity, streamsDatum.getId());
            } else if (item instanceof Channel) {
                activity = new Activity();
                this.youtubeActivityUtil.updateActivity((Channel) item, activity, null);
            } else {
                throw new NotImplementedException(
                        "Type conversion not implement for type : " + item.getClass().getName());
            }

            if (activity != null) {
                result = new StreamsDatum(activity);
                count++;
            }
        } catch (Exception e) {
            LOGGER.error("Exception while converting Video to Activity: {}", e);
        }

        if (result != null)
            return Lists.newArrayList(result);
        else
            return Lists.newArrayList();
    }

    private Object deserializeItem(Object item) {
        try {
            Class klass = YoutubeEventClassifier.detectClass((String) item);
            if (klass.equals(Video.class)) {
                item = mapper.readValue((String) item, Video.class);
            } else if (klass.equals(Channel.class)) {
                item = mapper.readValue((String) item, Channel.class);
            }
        } catch (Exception e) {
            LOGGER.error("Exception while trying to deserializeItem: {}", e);
        }

        return item;
    }

    @Override
    public void prepare(Object o) {
        youtubeActivityUtil = new YoutubeActivityUtil();
        mapper = StreamsJacksonMapper.getInstance();

        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addDeserializer(Video.class, new YoutubeVideoDeserializer());
        mapper.registerModule(simpleModule);
        simpleModule = new SimpleModule();
        simpleModule.addDeserializer(Channel.class, new YoutubeChannelDeserializer());
        mapper.registerModule(simpleModule);
    }

    @Override
    public void cleanUp() {
    }
}