org.inbio.neoportal.image_crawler.flickr.GroupPoolsInterface.java Source code

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Here is the source code for org.inbio.neoportal.image_crawler.flickr.GroupPoolsInterface.java

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/*
 *  NeoPortal - New implementation of the INBio Species and Occurrences portal.
 *  
 *  Copyright (C) 2010 INBio - Instituto Nacional de Biodiversidad, Costa Rica
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.inbio.neoportal.image_crawler.flickr;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.NoSuchElementException;

import org.apache.commons.io.IOUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.fasterxml.jackson.databind.Module;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jsonorg.JsonOrgModule;

public class GroupPoolsInterface {

    private String apiKey;

    private int page;
    private int pages;

    public GroupPoolsInterface(String apiKey) {
        this.apiKey = apiKey;
        this.page = 0;
        this.pages = 0;
    }

    public boolean hasNext() {
        if (this.pages > 0 && this.pages <= this.page)
            return false;
        else
            return true;
    }

    /**
     * Return and JSONArray with the next photos page
     * @param groupId
     * @return JSONArray or null when finish
     */
    public JSONArray nextPhotosPage(String groupId) {
        this.page++;

        if (this.pages > 0 && this.pages < this.page)
            throw new NoSuchElementException();

        String flickrPoolUrl = "http://api.flickr.com/services/rest/?method=flickr.groups.pools.getPhotos";
        flickrPoolUrl += "&api_key=" + this.apiKey;
        flickrPoolUrl += "&group_id=" + groupId;
        flickrPoolUrl += "&page=" + page;
        //flickrPoolUrl += "&extras=description%2C+license%2C+date_upload%2C+date_taken%2C+owner_name%2C+icon_server%2C+original_format%2C+last_update%2C+geo%2C+tags%2C+machine_tags%2C+o_dims%2C+views%2C+media%2C+path_alias%2C+url_sq%2C+url_t%2C+url_s%2C+url_q%2C+url_m%2C+url_n%2C+url_z%2C+url_c%2C+url_l%2C+url_o";
        flickrPoolUrl += "&extras=description,license,date_upload,date_taken,owner_name,icon_server,original_format,last_update,geo,tags,machine_tags,o_dims,views,media,path_alias,url_sq,url_t,url_s,url_q,url_m,url_n,url_z,url_c,url_l,url_o";
        flickrPoolUrl += "&format=json&nojsoncallback=1";

        InputStream in = null;
        ObjectMapper mapper = new ObjectMapper();
        mapper.registerModule((Module) new JsonOrgModule());

        try {
            in = new URL(flickrPoolUrl).openStream();

            String json = IOUtils.toString(in);

            JSONObject jsonObject = mapper.readValue(json, JSONObject.class);

            this.pages = ((JSONObject) jsonObject.get("photos")).getInt("pages");

            JSONArray photoArray = ((JSONObject) jsonObject.get("photos")).getJSONArray("photo");

            return photoArray;

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            IOUtils.closeQuietly(in);
        }

        return null;
    }
}