# InfoLetterContributionLocator.java

    /*
     * Copyright (C) 2000 - 2026 Silverpeas
     *
     * This program is free software: you can redistribute it and/or modify
     * it under the terms of the GNU Affero General Public License as
     * published by the Free Software Foundation, either version 3 of the
     * License, or (at your option) any later version.
     *
     * As a special exception to the terms and conditions of version 3.0 of
     * the GPL, you may redistribute this Program in connection with Free/Libre
     * Open Source Software ("FLOSS") applications as described in Silverpeas's
     * FLOSS exception.  You should have received a copy of the text describing
     * the FLOSS exception, and it is also available here:
     * "https://www.silverpeas.org/legal/floss_exception.html"
     *
     * This program 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 Affero General Public License for more details.
     *
     * You should have received a copy of the GNU Affero General Public License
     * along with this program.  If not, see <https://www.gnu.org/licenses/>.
     */

    package org.silverpeas.components.infoletter.service;

    import org.silverpeas.components.infoletter.model.InfoLetterPublicationPdC;
    import org.silverpeas.components.infoletter.model.InfoLetterService;
    import org.silverpeas.core.contribution.ContributionLocatorByLocalIdAndType;
    import org.silverpeas.core.contribution.model.Contribution;
    import org.silverpeas.core.contribution.model.ContributionIdentifier;
    import org.silverpeas.core.persistence.jdbc.bean.IdPK;

    import javax.inject.Named;
    import java.util.List;
    import java.util.Optional;

    import static java.util.Collections.singletonList;
    import static java.util.Optional.empty;

    /**
     * This is an implementation of {@link ContributionLocatorByLocalIdAndType} which is able to locate
     * {@link Contribution} of following types:
     * <ul>
     * <li>{@link InfoLetterPublicationPdC}</li>
     * </ul>
     * @author silveryocha
     */
    @Named
    public class InfoLetterContributionLocator implements ContributionLocatorByLocalIdAndType {

      private static final List<String> HANDLED_TYPES = singletonList(InfoLetterPublicationPdC.TYPE);

      @Override
      public boolean isContributionLocatorOfType(final String type) {
        return HANDLED_TYPES.contains(type);
      }

      @Override
      public Optional<ContributionIdentifier> getContributionIdentifierFromLocalIdAndType(
          final String localId, final String type) {
        if (InfoLetterPublicationPdC.TYPE.equals(type)) {
          final InfoLetterService service = InfoLetterService.get();
          final IdPK pk = new IdPK(localId);
          return Optional.ofNullable(service.getInfoLetterPublication(pk))
              .map(InfoLetterPublicationPdC::getIdentifier);
        }
        return empty();
      }
    }