/*
    * This file is part of ***  M y C o R e  ***
    * See http://www.mycore.de/ for details.
    *
    * MyCoRe is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    *
   * MyCoRe is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with MyCoRe.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package org.mycore.mods.bibtex;
  
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.Set;
  
  import org.jdom2.Element;
  
  import bibtex.dom.BibtexAbstractValue;
  import bibtex.dom.BibtexEntry;
  import bibtex.dom.BibtexString;
  
  /**
   * Transforms any BibTeX field that can not be mapped to MODS to a mods:extension/field element.
   *
   * @author Frank L\u00FCtzenkirchen
   */
  class MCRUnsupportedFieldTransformer extends MCRFieldTransformer {
  
      Set<String> supportedFields = new HashSet<>();
  
      MCRUnsupportedFieldTransformer(Collection<MCRFieldTransformer> supportedTransformers) {
          super("*");
          determineSupportedFields(supportedTransformers);
      }
  
      private void determineSupportedFields(Collection<MCRFieldTransformer> supportedTransformers) {
          for (MCRFieldTransformer transformer : supportedTransformers) {
              supportedFields.add(transformer.getField());
          }
      }
  
      private boolean isUnsupported(String field) {
          return !supportedFields.contains(field);
      }
  
      void transformField(BibtexEntry entry, Element parent) {
          for (String field : (entry.getFields().keySet())) {
              if (isUnsupported(field)) {
                  this.field = field;
                  super.transformField(entry, parent);
              }
          }
      }
  
      void buildField(BibtexAbstractValue value, Element parent) {
          MCRMessageLogger.logMessage("Field " + field + " is unsupported: " + value.toString().replaceAll("\\s+", " "));
          String xPath = "mods:extension/field[@name='" + field + "']" + MCRFieldTransformer.AS_NEW_ELEMENT;
          String content = ((BibtexString) value).getContent();
          content = normalizeValue(content);
          buildElement(xPath, content, parent);
      }
  }