[WIP] Use CERMINE as PDF parser

build.gradle

@@ -60,6 +60,9 @@ repositories {
     maven {
         url 'https://oss.sonatype.org/content/groups/public'
     }
+    maven {
+        url 'http://maven.icm.edu.pl/artifactory/repo'
+    }
 }
 
 configurations {
@@ -81,6 +84,8 @@ dependencies {
     compile 'org.apache.pdfbox:fontbox:1.8.13'
     compile 'org.apache.pdfbox:jempbox:1.8.13'
 
+    compile 'pl.edu.icm.cermine:cermine-impl:1.11'
+
     // required for reading write-protected PDFs - see https://github.com/JabRef/jabref/pull/942#issuecomment-209252635
     compile 'org.bouncycastle:bcprov-jdk15on:1.55'
 

src/main/java/net/sf/jabref/logic/bibtexkeypattern/BibtexKeyPatternPreferences.java

@@ -1,5 +1,7 @@
 package net.sf.jabref.logic.bibtexkeypattern;
 
+import java.util.Collections;
+
 import net.sf.jabref.model.bibtexkeypattern.GlobalBibtexKeyPattern;
 
 public class BibtexKeyPatternPreferences {
@@ -12,6 +14,16 @@ public class BibtexKeyPatternPreferences {
     private final GlobalBibtexKeyPattern keyPattern;
     private Character keywordDelimiter;
 
+    public BibtexKeyPatternPreferences() {
+        this.keyPatternRegex = "";
+        this.keyPatternReplacement = "";
+        this.alwaysAddLetter = false;
+        this.firstLetterA = false;
+        this.enforceLegalKey = false;
+        this.keyPattern = new GlobalBibtexKeyPattern(Collections.emptyList());
+        this.keywordDelimiter = ',';
+    }
+
     public BibtexKeyPatternPreferences(String keyPatternRegex, String keyPatternReplacement, boolean alwaysAddLetter,
             boolean firstLetterA, boolean enforceLegalKey, GlobalBibtexKeyPattern keyPattern,
             Character keywordDelimiter) {

src/main/java/net/sf/jabref/logic/formatter/bibtexfields/NormalizeDateFormatter.java

@@ -1,14 +1,10 @@
 package net.sf.jabref.logic.formatter.bibtexfields;
 
-import java.time.format.DateTimeFormatter;
-import java.time.format.DateTimeParseException;
-import java.time.temporal.TemporalAccessor;
-import java.util.Arrays;
-import java.util.List;
 import java.util.Optional;
 
 import net.sf.jabref.logic.l10n.Localization;
 import net.sf.jabref.model.cleanup.Formatter;
+import net.sf.jabref.model.entry.Date;
 
 /**
  * This class transforms date to the format yyyy-mm-dd or yyyy-mm..
@@ -34,13 +30,8 @@ public String getKey() {
      */
     @Override
     public String format(String value) {
-        Optional<TemporalAccessor> parsedDate = tryParseDate(value);
-        if (!parsedDate.isPresent()) {
-            return value;
-        }
-
-        DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("uuuu-MM[-dd]");
-        return dateFormatter.format(parsedDate.get());
+        Optional<Date> parsedDate = Date.parse(value);
+        return parsedDate.map(Date::getNormalized).orElse(value);
     }
 
     @Override
@@ -53,29 +44,6 @@ public String getExampleInput() {
         return "29.11.2003";
     }
 
-    /*
-     * Try to parse the following formats
-     *  "M/y" (covers 9/15, 9/2015, and 09/2015)
-     *  "MMMM (dd), yyyy" (covers September 1, 2015 and September, 2015)
-     *  "yyyy-MM-dd" (covers 2009-1-15)
-     *  "d.M.uuuu" (covers 15.1.2015)
-     *  "uuuu.M.d" (covers 2015.1.15)
-     * The code is essentially taken from http://stackoverflow.com/questions/4024544/how-to-parse-dates-in-multiple-formats-using-simpledateformat.
-     */
-    private Optional<TemporalAccessor> tryParseDate(String dateString) {
-        List<String> formatStrings = Arrays.asList("uuuu-M-d", "uuuu-M", "M/uu", "M/uuuu", "MMMM d, uuuu", "MMMM, uuuu",
-                "d.M.uuuu", "uuuu.M.d");
-        for (String formatString : formatStrings) {
-            try {
-                return Optional.of(DateTimeFormatter.ofPattern(formatString).parse(dateString));
-            } catch (DateTimeParseException ignored) {
-                // Ignored
-            }
-        }
-
-        return Optional.empty();
-    }
-
     @Override
     public int hashCode() {
         return defaultHashCode();

src/main/java/net/sf/jabref/logic/importer/ImportFormatPreferences.java

@@ -1,6 +1,8 @@
 package net.sf.jabref.logic.importer;
 
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.Collections;
 import java.util.Set;
 
 import net.sf.jabref.logic.bibtex.FieldContentParserPreferences;
@@ -16,6 +18,15 @@ public class ImportFormatPreferences {
     private final FieldContentParserPreferences fieldContentParserPreferences;
     private final boolean keywordSyncEnabled;
 
+    public ImportFormatPreferences() {
+        this.customImportList = Collections.emptySet();
+        this.encoding = StandardCharsets.UTF_8;
+        this.keywordSeparator = ',';
+        this.bibtexKeyPatternPreferences = new BibtexKeyPatternPreferences();
+        this.fieldContentParserPreferences = new FieldContentParserPreferences();
+        this.keywordSyncEnabled = false;
+    }
+
     public ImportFormatPreferences(Set<CustomImporter> customImportList, Charset encoding, Character keywordSeparator,
             BibtexKeyPatternPreferences bibtexKeyPatternPreferences,
             FieldContentParserPreferences fieldContentParserPreferences, boolean keywordSyncEnabled) {

src/main/java/net/sf/jabref/logic/importer/ParserResult.java

@@ -21,14 +21,12 @@ public class ParserResult {
 
     private static final ParserResult NULL_RESULT = new ParserResult(null, null, null);
     private final BibDatabase base;
-    private MetaData metaData;
     private final Map<String, EntryType> entryTypes;
-    private BibDatabaseContext bibDatabaseContext;
-
-    private File file;
     private final List<String> warnings = new ArrayList<>();
     private final List<String> duplicateKeys = new ArrayList<>();
-
+    private MetaData metaData;
+    private BibDatabaseContext bibDatabaseContext;
+    private File file;
     private String errorMessage;
 
     private boolean invalid;
@@ -61,6 +59,18 @@ public static ParserResult fromErrorMessage(String message) {
         return parserResult;
     }
 
+    public static ParserResult getNullResult() {
+        return NULL_RESULT;
+    }
+
+    public static ParserResult fromError(Exception exception) {
+        return fromErrorMessage(exception.getLocalizedMessage());
+    }
+
+    public static ParserResult fromEntry(BibEntry entry) {
+        return new ParserResult(Collections.singleton(entry));
+    }
+
     /**
      * Check if this base is marked to be added to the currently open tab. Default is false.
      *
@@ -181,8 +191,4 @@ public boolean hasDatabaseContext() {
     public boolean isNullResult() {
         return this == NULL_RESULT;
     }
-
-    public static ParserResult getNullResult() {
-        return NULL_RESULT;
-    }
 }