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package eu.dnetlib.data.collector.plugins.opentrial;
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/**
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* Created by miriam on 07/03/2017.
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*/
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import eu.dnetlib.data.collector.rmi.CollectorServiceException;
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import eu.dnetlib.data.collector.rmi.CollectorServiceRuntimeException;
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import org.apache.commons.io.IOUtils;
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import java.net.*;
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import java.util.Iterator;
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import java.util.concurrent.ArrayBlockingQueue;
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//import java.util.function.Consumer;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.json.*;
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public class OpenTrialIterator implements Iterable<String> {
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private final String base_url;
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private int total ;
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private ArrayBlockingQueue<String> trials = new ArrayBlockingQueue<String>(100);
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private int current = 0;
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private static final Log log = LogFactory.getLog(OpenTrialIterator.class);
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public OpenTrialIterator(String base_url, String from_date, String to_date)throws CollectorServiceException{
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try {
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String q = "per_page=100";
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if (!(from_date == null)) {
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if (!(to_date == null)) {
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q = "q=registration_date%3A%5B" + from_date + "%20TO%20" + to_date + "%5D&" + q;
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} else
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q = "q=registration_date%3A%5B" + from_date + "%20TO%20*%5D&" + q;
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}
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this.base_url = base_url+ q;
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log.info("url from which to collect " + this.base_url);
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prepare();
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}catch(Exception ex){
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throw new CollectorServiceException(ex);
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}
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}
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private void prepare()throws Exception {
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JSONObject json = new JSONObject(getPage(1));
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total = json.getInt("total_count");
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log.info("Total number of entries to collect: " + total);
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fillTrials(json);
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}
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@Override
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public Iterator<String> iterator() {
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return new Iterator<String>(){
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private int page_number = 2;
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@Override
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public void remove(){
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}
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@Override
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public String next() {
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try {
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if (trials.isEmpty()) {
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JSONObject json = new JSONObject(getPage(page_number));
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fillTrials(json);
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page_number++;
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}
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return trials.poll();
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}catch(Exception ex){
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throw new CollectorServiceRuntimeException(ex);
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}
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}
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@Override
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public boolean hasNext(){
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log.debug("More entries to collect: (" + current + "<" + total + "=" + (current < total));
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return (current < total || !trials.isEmpty());
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}
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};
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}
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private void fillTrials(JSONObject json)throws CollectorServiceException{
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JSONArray entries = json.getJSONArray("items");
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for(Object entry: entries) {
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try {
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trials.put(XML.toString(entry));
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}catch(Exception ex){
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throw new CollectorServiceException(ex);
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}
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current++;
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}
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}
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private String getPage(int page_number)throws CollectorServiceException {
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try {
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URL url = new URL(base_url + "&page=" + page_number);
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URLConnection conn = url.openConnection();
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conn.setRequestProperty("User-Agent", "Mozilla/5.0");
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return (IOUtils.toString(conn.getInputStream()));
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}catch(Exception ex){
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throw new CollectorServiceException(ex);
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}
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}
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}
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