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package eu.dnetlib.data.collector.plugins.HTTPWithFileName;
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import eu.dnetlib.data.collector.rmi.CollectorServiceException;
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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.JSONObject;
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import org.json.XML;
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import org.jsoup.Jsoup;
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import org.jsoup.nodes.Document;
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import org.jsoup.nodes.Element;
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import org.jsoup.select.Elements;
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import java.util.ArrayList;
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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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/**
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* Created by miriam on 04/05/2018.
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*/
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public class HTTPWithFileNameCollectorIterable implements Iterable<String> {
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private static final Log log = LogFactory.getLog(HTTPWithFileNameCollectorIterable.class);
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private final ArrayList<String> urls = new ArrayList<>();
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private final ArrayList<String> metas = new ArrayList<String>();
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private String filter;
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public HTTPWithFileNameCollectorIterable(String startUrl, String filter){
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urls.add(startUrl);
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this.filter = filter;
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}
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private boolean containsFilter(String meta){
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if (filter == null || filter.isEmpty())
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return false;
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String[] filter = this.filter.split(";");
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for(String item:filter){
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if (meta.contains(item))
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return true;
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}
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return false;
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}
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private String addFilePath(String meta,String url, boolean isJson){
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String path = url.replace("metadata", "pdf");
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try {
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if(isJson)
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meta = meta.substring(0, meta.length() - 1) + ",'downloadFileUrl':'" + path.substring(0, path.indexOf(".json")) + ".pdf'}";
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else{
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if (meta.trim().startsWith("<!DOCTYPE"))
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meta = meta.substring(meta.indexOf(">")+1);
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int index = meta.lastIndexOf("</");
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meta = meta.substring(0, index) + "<downloadFileUrl>" + path.substring(0, path.indexOf(".xml")) + ".pdf</downloadFileUrl>" + meta.substring(index);
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}
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}catch(Exception ex){
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log.info("not file with extension .json or .xml");
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}
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//JSONObject jsonobj = new JSONObject("{'metadata':"+json+"}");
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if(isJson){
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JSONObject jsonobj = new JSONObject("{'resource':" + meta + "}");
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return XML.toString(jsonobj);
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}
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return meta;
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}
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private void recurFolder(String text, String url){
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Document doc = Jsoup.parse(text);
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Elements links = doc.select("a");
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for(Element e:links){
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if (!e.text().equals("../")){
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String file = e.attr("href");
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if(file.endsWith(".json") || file.endsWith(".xml"))
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metas.add(url+file);
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else
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urls.add(url+file);
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}
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}
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}
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@Override
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public Iterator<String> iterator() {
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final ArrayBlockingQueue<String> queue = new ArrayBlockingQueue<String>(100);
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return new Iterator<String>(){
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public void fillQueue() {
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Connector c = new Connector();
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String url;
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while((metas.size()>0 || urls.size() > 0 ) && queue.size()<100){
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if (metas.size() > 0){
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url = metas.remove(0);
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try {
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c.get(url);
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} catch (CollectorServiceException e) {
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log.error("Impossible to collect url: " + url + " error: " + e.getMessage());
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}
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if(c.isStatusOk()){
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try {
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String ret = c.getResponse();
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if (ret != null && ret.length()>0 && !containsFilter(ret))
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queue.put(addFilePath(ret,url,url.endsWith(".json")));
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} catch (InterruptedException e) {
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log.error("not inserted in queue element associate to url " + url + " error: " + e.getMessage() );
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}
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}
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}else{
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url = urls.remove(0);
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try {
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c.get(url);
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} catch (CollectorServiceException e) {
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log.error("Impossible to collect url: " + url + " error: " + e.getMessage());
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}
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if(c.isStatusOk()){
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if (c.responseTypeContains("text/html")){
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recurFolder(c.getResponse(),url);
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}
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else if(c.responseTypeContains("application/json") || c.responseTypeContains("application/xml")){
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try {
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queue.put(addFilePath(c.getResponse(),url, c.responseTypeContains("application/json")));
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} catch (InterruptedException e) {
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log.error("not inserted in queue element associate to url " + url + " error: " + e.getMessage() );
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}
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}
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}
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}
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}
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}
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@Override
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public boolean hasNext() {
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if (queue.isEmpty()){
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fillQueue();
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}
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return (!queue.isEmpty());
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}
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@Override
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public String next() {
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return queue.poll();
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}
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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 void forEachRemaining(Consumer<? super String> action) {
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}
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};
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}
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}
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