com.appspot.bitlyminous.handler.twitter.SaveUrlHandler.java Source code

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Here is the source code for com.appspot.bitlyminous.handler.twitter.SaveUrlHandler.java

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/*
 * Copyright 2010 Nabeel Mukhtar 
 * 
 * Licensed 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 com.appspot.bitlyminous.handler.twitter;

import java.net.HttpURLConnection;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;

import twitter4j.Status;
import twitter4j.StatusUpdate;

import com.appspot.bitlyminous.constant.ApplicationConstants;
import com.appspot.bitlyminous.entity.Tag;
import com.appspot.bitlyminous.entity.Tags;
import com.appspot.bitlyminous.entity.User;
import com.appspot.bitlyminous.entity.Version;
import com.appspot.bitlyminous.gateway.DeliciousGateway;
import com.appspot.bitlyminous.gateway.GatewayException;
import com.appspot.bitlyminous.gateway.GatewayFactory;
import com.google.appengine.api.datastore.Text;
import com.rosaloves.bitlyj.Bitly;
import com.rosaloves.bitlyj.Url;

/**
 * The Class SaveUrlHandler.
 */
public class SaveUrlHandler extends AbstractTwitterHandler {

    /**
     * Instantiates a new save url handler.
     * 
     * @param context the context
     */
    public SaveUrlHandler(TwitterContext context) {
        super(context);
    }

    /** The Constant GATEWAY_FACTORY. */
    private static final GatewayFactory GATEWAY_FACTORY = GatewayFactory.newInstance();

    /* (non-Javadoc)
     * @see com.appspot.bitlyminous.handler.twitter.TwitterHandler#execute(twitter4j.Status)
     */
    @Override
    public StatusUpdate execute(Status tweet) {
        try {
            List<String> shortUrls = extractBitlyUrls(tweet.getText());
            if (!shortUrls.isEmpty()) {
                Set<Url> longUrls = getBitlyClient()
                        .call(Bitly.expand(shortUrls.toArray(new String[shortUrls.size()])));
                List<com.appspot.bitlyminous.entity.Url> entities = new ArrayList<com.appspot.bitlyminous.entity.Url>();
                for (Url url : longUrls) {
                    if (!isEmpty(url.getLongUrl())) {
                        com.appspot.bitlyminous.entity.Url entity = new com.appspot.bitlyminous.entity.Url();
                        entity.setDescription(tweet.getText());
                        entity.setUrl(url.getLongUrl());
                        entity.setShortUrl(url.getShortUrl());
                        entity.setDateSubmitted(tweet.getCreatedAt());
                        List<String> suggestedTags = new ArrayList<String>();
                        DeliciousGateway deliciousGateway = getDeliciousGateway(context.getVersion());
                        try {
                            suggestedTags = deliciousGateway.getSuggestedTags(url.getLongUrl());
                        } catch (GatewayException e) {
                            logger.log(Level.WARNING, "Seems like Delicious token expired again.", e);
                            if (e.getErrorCode() == HttpURLConnection.HTTP_UNAUTHORIZED) {
                                deliciousGateway
                                        .refreshToken(context.getVersion().getDeliciousSessionHandle().getValue());
                                context.getVersion().setDeliciousToken(
                                        new Text(deliciousGateway.getOAuthAuthentication().getAccessToken()));
                                context.getVersion().setDeliciousSecret(
                                        new Text(deliciousGateway.getOAuthAuthentication().getAccessTokenSecret()));
                                context.getVersion().setDeliciousSessionHandle(new Text(
                                        deliciousGateway.getOAuthAuthentication().getOauthSessionHandle()));
                                suggestedTags = deliciousGateway.getSuggestedTags(url.getLongUrl());
                            } else {
                                throw e;
                            }
                        }
                        entity.setTags(suggestedTags);
                        entity.setUser(context.getUser());
                        updateUserTags(context.getUser(), suggestedTags);
                        entities.add(entity);
                    }
                }
                context.setUrls(entities);
                updateUserUrls(context.getUser(), entities);
            }
        } catch (Exception e) {
            logger.log(Level.SEVERE, "Error while persisting urls.", e);
        }

        return null;
    }

    /**
     * Update user urls.
     * 
     * @param user the user
     * @param entities the entities
     */
    private void updateUserUrls(User user, List<com.appspot.bitlyminous.entity.Url> entities) {
        List<com.appspot.bitlyminous.entity.Url> urls = user.getUrls();
        for (com.appspot.bitlyminous.entity.Url url : entities) {
            urls.add(url);
        }
        //      user.setUrls(urls);
    }

    /**
     * Update user tags.
     * 
     * @param user the user
     * @param suggestedTags the suggested tags
     */
    private void updateUserTags(User user, List<String> suggestedTags) {
        Tags tags = user.getTags();
        if (tags == null) {
            tags = new Tags();
        }

        for (String string : suggestedTags) {
            boolean found = false;
            for (Tag tag : tags.getTag()) {
                if (tag.getTag().equals(string)) {
                    tag.setCount(tag.getCount() + 1);
                    found = true;
                }
            }
            if (!found) {
                Tag tag = new Tag();
                tag.setTag(string);
                tag.setCount(1L);
                tags.getTag().add(tag);
            }
        }
        user.setTags(tags);
    }

    /**
     * Gets the delicious gateway.
     * 
     * @param version the version
     * 
     * @return the delicious gateway
     */
    protected DeliciousGateway getDeliciousGateway(Version version) {
        DeliciousGateway gateway = GATEWAY_FACTORY.createDeliciousGateway(
                ApplicationConstants.DELICIOUS_CONSUMER_KEY, ApplicationConstants.DELICIOUS_CONSUMER_SECRET,
                version.getDeliciousToken().getValue(), version.getDeliciousSecret().getValue());
        gateway.getOAuthAuthentication().setOauthSessionHandle(version.getDeliciousSessionHandle().getValue());
        return gateway;
    }
}