put all changed/new files concerning the issue JabRef#5804 for the ACMPortalParser into one folder

Author: NatashaDudi

src/main/ACMPortalFetcher.java

@@ -0,0 +1,91 @@
+package org.jabref.logic.importer.fetcher;
+
+import java.io.*;
+import java.net.*;
+import java.nio.charset.StandardCharsets;
+import java.util.*;
+
+import org.jabref.logic.help.HelpFile;
+import org.jabref.logic.importer.*;
+import org.jabref.logic.importer.fileformat.ACMPortalParser;
+import org.jabref.logic.importer.fileformat.BibtexParser;
+import org.jabref.model.entry.BibEntry;
+import org.jabref.model.strings.StringUtil;
+import org.jabref.model.util.DummyFileUpdateMonitor;
+
+import org.apache.http.client.utils.URIBuilder;
+
+public class ACMPortalFetcher implements SearchBasedParserFetcher {
+
+    public static final String SEARCH_URL = "https://dl.acm.org/action/doSearch";
+
+    public final ImportFormatPreferences preferences;
+
+    public ACMPortalFetcher(ImportFormatPreferences preferences) {
+        this.preferences = Objects.requireNonNull(preferences);
+    }
+
+    @Override
+    public String getName() {
+        return "ACM Portal";
+    }
+
+    @Override
+    public Optional<HelpFile> getHelpPage() {
+        return Optional.of(HelpFile.FETCHER_ACM);
+    }
+
+    /*
+     * This method changes the given query from the search bar in this form. >"words" "are" "split"<.
+     * For the Url we need >words+are+split<
+     * So we delete the spaces and change the quotation marks to plus where needed.
+     */
+    public static String createQueryString(String query) {
+        // deletes all spaces
+        query = query.trim().replaceAll("\\s+", "");
+
+        // changes the quotation marks between search results to a + (used with complex search)
+        String newQuery = "";
+        char lastChar = '\"';
+        for (int i = 0; i < query.length(); i++) {
+            // check for quotations
+            if (query.charAt(i) == '\"') {
+                // check if the char before was also a quotation mark (because we only need one + between words)
+                // check if you are at the last char of the query (so there is no plus needed)
+                if (lastChar != '\"' && i + 1 != query.length()) {
+                    newQuery += "+";
+                }
+            } else {
+                newQuery += query.charAt(i);
+            }
+            lastChar = query.charAt(i);
+        }
+        return newQuery;
+    }
+
+    /*
+     * Constructing the url for the searchpage.
+     * The query is the input from the search bar.
+     *
+     * Good to know:
+     * This method is used at SearchBasedParserFetcher line 49.
+     *
+     */
+    public URL getURLForQuery(String query) throws URISyntaxException, MalformedURLException, FetcherException {
+        URIBuilder uriBuilder = new URIBuilder(SEARCH_URL);
+        uriBuilder.addParameter("AllField", createQueryString(query));
+        return uriBuilder.build().toURL();
+    }
+
+    /*
+     * Gives back an instance of our ACMPortalParser.
+     *
+     * What happens next in the program:
+     * At line 77 in the SearchBasedParserFetcher an InputStream is created by the given URL
+     * (see getURLForQuery). Then in line 78 this method is used as followed:
+     * List<BibEntry> fetchedEntries = getParser().parseEntries(stream);
+     */
+    public Parser getParser() {
+        return new ACMPortalParser();
+    }
+}