Examples with FetcherException org.jabref.logic.importer.FetcherException used on opensource projects

Example 11 with FetcherException

use of org.jabref.logic.importer.FetcherException in project jabref by JabRef.

the class ArXiv method callApi.

/**
     * Queries the API.
     *
     * If only {@code searchQuery} is given, then the API will return results for each article that matches the query.
     * If only {@code ids} is given, then the API will return results for each article in the list.
     * If both {@code searchQuery} and {@code ids} are given, then the API will return each article in
     * {@code ids} that matches {@code searchQuery}. This allows the API to act as a results filter.
     *
     * @param searchQuery the search query used to find articles;
     *                    <a href="http://arxiv.org/help/api/user-manual#query_details">details</a>
     * @param ids         a list of arXiv identifiers
     * @param start       the index of the first returned result (zero-based)
     * @param maxResults  the number of maximal results (has to be smaller than 2000)
     * @return the response from the API as a XML document (Atom 1.0)
     * @throws FetcherException if there was a problem while building the URL or the API was not accessible
     */
private Document callApi(String searchQuery, List<ArXivIdentifier> ids, int start, int maxResults) throws FetcherException {
    if (maxResults > 2000) {
        throw new IllegalArgumentException("The arXiv API limits the number of maximal results to be 2000");
    }
    try {
        URIBuilder uriBuilder = new URIBuilder(API_URL);
        // The arXiv API has problems with accents, so we remove them (i.e. Fréchet -> Frechet)
        if (StringUtil.isNotBlank(searchQuery)) {
            uriBuilder.addParameter("search_query", StringUtil.stripAccents(searchQuery));
        }
        if (!ids.isEmpty()) {
            uriBuilder.addParameter("id_list", ids.stream().map(ArXivIdentifier::getNormalized).collect(Collectors.joining(",")));
        }
        uriBuilder.addParameter("start", String.valueOf(start));
        uriBuilder.addParameter("max_results", String.valueOf(maxResults));
        URL url = uriBuilder.build().toURL();
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        if (connection.getResponseCode() == 400) {
            // Bad request error from server, try to get more information
            throw getException(builder.parse(connection.getErrorStream()));
        } else {
            return builder.parse(connection.getInputStream());
        }
    } catch (SAXException | ParserConfigurationException | IOException | URISyntaxException exception) {
        throw new FetcherException("arXiv API request failed", exception);
    }
}

Example 12 with FetcherException

use of org.jabref.logic.importer.FetcherException in project jabref by JabRef.

the class ArXiv method getException.

private FetcherException getException(Document error) {
    List<Node> entries = XMLUtil.asList(error.getElementsByTagName("entry"));
    // </entry>
    if (entries.size() == 1) {
        Node node = entries.get(0);
        Optional<String> id = XMLUtil.getNodeContent(node, "id");
        Boolean isError = id.map(idContent -> idContent.startsWith("http://arxiv.org/api/errors")).orElse(false);
        if (isError) {
            String errorMessage = XMLUtil.getNodeContent(node, "summary").orElse("Unknown error");
            return new FetcherException(errorMessage);
        }
    }
    return new FetcherException("arXiv API request failed");
}

Example 13 with FetcherException

use of org.jabref.logic.importer.FetcherException in project jabref by JabRef.

the class DoiFetcher method performSearchById.

@Override
public Optional<BibEntry> performSearchById(String identifier) throws FetcherException {
    Optional<DOI> doi = DOI.parse(identifier);
    try {
        if (doi.isPresent()) {
            URL doiURL = new URL(doi.get().getURIAsASCIIString());
            // BibTeX data
            URLDownload download = new URLDownload(doiURL);
            download.addHeader("Accept", "application/x-bibtex");
            String bibtexString = download.asString();
            // BibTeX entry
            Optional<BibEntry> fetchedEntry = BibtexParser.singleFromString(bibtexString, preferences);
            fetchedEntry.ifPresent(this::doPostCleanup);
            return fetchedEntry;
        } else {
            throw new FetcherException(Localization.lang("Invalid_DOI:_'%0'.", identifier));
        }
    } catch (IOException e) {
        throw new FetcherException(Localization.lang("Connection error"), e);
    } catch (ParseException e) {
        throw new FetcherException("Could not parse BibTeX entry", e);
    }
}

Example 14 with FetcherException

use of org.jabref.logic.importer.FetcherException in project jabref by JabRef.

the class AstrophysicsDataSystem method performSearch.

@Override
public List<BibEntry> performSearch(String query) throws FetcherException {
    if (StringUtil.isBlank(query)) {
        return Collections.emptyList();
    }
    try {
        URLConnection connection = getURLForQuery(query).openConnection();
        connection.setRequestProperty("User-Agent", URLDownload.USER_AGENT);
        try (InputStream stream = connection.getInputStream()) {
            List<BibEntry> fetchedEntries = getParser().parseEntries(stream);
            // Post-cleanup
            fetchedEntries.forEach(this::doPostCleanup);
            return fetchedEntries;
        } catch (IOException e) {
            throw new FetcherException("An I/O exception occurred", e);
        }
    } catch (URISyntaxException | MalformedURLException e) {
        throw new FetcherException("Search URI is malformed", e);
    } catch (IOException e) {
        throw new FetcherException("An I/O exception occurred", e);
    } catch (ParseException e) {
        throw new FetcherException("Error occurred when parsing entry", Localization.lang("Error occurred when parsing entry"), e);
    }
}

Example 15 with FetcherException

use of org.jabref.logic.importer.FetcherException in project jabref by JabRef.

the class GoogleScholar method obtainAndModifyCookie.

private void obtainAndModifyCookie() throws FetcherException {
    try {
        URLDownload downloader = new URLDownload("https://scholar.google.com");
        List<HttpCookie> cookies = downloader.getCookieFromUrl();
        for (HttpCookie cookie : cookies) {
            // append "CF=4" which represents "Citation format bibtex"
            cookie.setValue(cookie.getValue() + ":CF=4");
        }
    } catch (IOException e) {
        throw new FetcherException("Cookie configuration for Google Scholar failed.", e);
    }
}