org.wso2.carbon.connector.twitter.TwitterGetFriends.java Source code

Introduction

Here is the source code for org.wso2.carbon.connector.twitter.TwitterGetFriends.java

Source

/*
 * Copyright (c) 2005-2013, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 * 
 * WSO2 Inc. 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.wso2.carbon.connector.twitter;

import java.io.IOException;
import java.util.List;

import javax.xml.stream.XMLStreamException;

import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.util.AXIOMUtil;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.MessageContext;
import org.codehaus.jettison.json.JSONException;
import org.wso2.carbon.connector.core.ConnectException;

import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.User;
import twitter4j.json.DataObjectFactory;

public class TwitterGetFriends extends AbstractTwitterConnector {

    private static Log log = LogFactory.getLog(TwitterGetFriends.class);

    public static final String USER_ID = "userID";

    public static final String SCREEN_NAME = "screenName";

    public static final String COUNT = "cursor";

    @Override
    public void connect(MessageContext messageContext) throws ConnectException {
        if (log.isDebugEnabled()) {
            log.info("executing twitter get user time line");
        }

        try {

            String screenName = (TwitterUtils.lookupTemplateParamater(messageContext, SCREEN_NAME) != null
                    && !TwitterUtils.lookupTemplateParamater(messageContext, SCREEN_NAME).isEmpty())

                            ? TwitterUtils.lookupTemplateParamater(messageContext, SCREEN_NAME)
                            : null;

            String userID = (TwitterUtils.lookupTemplateParamater(messageContext, USER_ID) != null
                    && !TwitterUtils.lookupTemplateParamater(messageContext, USER_ID).isEmpty())

                            ? TwitterUtils.lookupTemplateParamater(messageContext, USER_ID)
                            : null;

            String count = (TwitterUtils.lookupTemplateParamater(messageContext, COUNT) != null
                    && !TwitterUtils.lookupTemplateParamater(messageContext, COUNT).isEmpty())
                            ? TwitterUtils.lookupTemplateParamater(messageContext, COUNT)
                            : null;

            Twitter twitter = new TwitterClientLoader(messageContext).loadApiClient();

            List<User> results = null;

            if (screenName != null && !screenName.isEmpty()) {
                if (count != null && !count.isEmpty()) {
                    results = twitter.getFriendsList(screenName, Long.parseLong(count));
                } else {
                    results = twitter.getFriendsList(screenName, -1);
                }
            } else if (userID != null && !userID.isEmpty()) {
                if (count != null && !count.isEmpty()) {
                    results = twitter.getFriendsList(Long.parseLong(userID), Long.parseLong(count));
                } else {
                    results = twitter.getFriendsList(Long.parseLong(userID), -1);
                }
            }

            if (log.isDebugEnabled()) {
                log.error("Retrived results : " + results.toString());
            }

            OMElement element = this.performSearchMessages(results);

            super.preparePayload(messageContext, element);

        } catch (TwitterException te) {
            log.error("Failed to search twitter : " + te.getMessage(), te);
            TwitterUtils.storeErrorResponseStatus(messageContext, te);
        } catch (Exception te) {
            log.error("Failed to search generic: " + te.getMessage(), te);
            TwitterUtils.storeErrorResponseStatus(messageContext, te);
        }
    }

    /**
     * Performing the searching operation for the given Geo Query criteria.
     * 
     * @param twitter
     * @param query
     * @return
     * @throws XMLStreamException
     * @throws TwitterException
     * @throws JSONException
     * @throws IOException
     */
    private OMElement performSearchMessages(List<User> users)
            throws XMLStreamException, TwitterException, JSONException, IOException {
        OMElement resultElement = AXIOMUtil.stringToOM("<jsonObject><friends/></jsonObject>");
        OMElement childElment = resultElement.getFirstElement();

        for (User user : users) {
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.append("{ \"friend\" : ");
            String json = DataObjectFactory.getRawJSON(user);
            stringBuilder.append(json);
            stringBuilder.append("} ");
            OMElement element = super.parseJsonToXml(stringBuilder.toString());
            childElment.addChild(element.getFirstOMChild());
        }

        if (users.size() == 0) {
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.append("{ \"follower\" : {}");
            stringBuilder.append("} ");
            OMElement element = super.parseJsonToXml(stringBuilder.toString());
            resultElement.addChild(element);
        }
        return resultElement;

    }

}