# MediaCriteria.java

    /*
     * Copyright (C) 2000 - 2024 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:
     * "http://www.silverpeas.org/docs/core/legal/floss_exception.html"
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     * 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
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    package org.silverpeas.components.gallery.model;

    import org.silverpeas.components.gallery.constant.MediaType;
    import org.silverpeas.core.admin.service.OrganizationControllerProvider;
    import org.silverpeas.core.util.CollectionUtil;
    import org.silverpeas.kernel.util.StringUtil;
    import org.silverpeas.core.admin.user.model.SilverpeasRole;
    import org.silverpeas.core.admin.user.model.UserDetail;
    import org.silverpeas.core.util.DateUtil;

    import java.util.ArrayList;
    import java.util.Date;
    import java.util.List;
    import java.util.Set;

    import static org.silverpeas.components.gallery.model.MediaCriteria.VISIBILITY.BY_DEFAULT;
    import static org.silverpeas.components.gallery.model.MediaCriteria.VISIBILITY.FORCE_GET_ALL;

    /**
     * Class that permits to set media search criteria for media application.
     * @author Yohann Chastagnier
     */
    public class MediaCriteria {

      /**
       * Visibility of media albums.
       */
      public enum VISIBILITY {
        /**
         * Default visibility: publishers and admins can see all the albums (and hence the media they
         * contain). For any other roles, the users can see only the visible albums.
         */
        BY_DEFAULT,

        /**
         * Only the media in visible albums.
         */
        VISIBLE_ONLY,

        /**
         * Only the media in hidden albums.
         */
        HIDDEN_ONLY,

        /**
         * All the media, whatever the visibility of the album.
         */
        FORCE_GET_ALL
      }

      public enum QUERY_ORDER_BY {

        SIZE_ASC(false, "size", true), SIZE_DESC(false, "size", false),
        DIMENSION_ASC(false, "dimension", true), DIMENSION_DESC(false, "dimension", false),
        COMPONENT_INSTANCE_ASC(true, "M.instanceId", true),
        COMPONENT_INSTANCE_DESC(true, "M.instanceId", false),
        IDENTIFIER_ASC(true, "M.mediaId", true), IDENTIFIER_DESC(true, "M.mediaId", false),
        CREATE_DATE_ASC(true, "M.createDate", true), CREATE_DATE_DESC(true, "M.createDate", false),
        LAST_UPDATE_DATE_ASC(true, "M.lastUpdateDate", true),
        LAST_UPDATE_DATE_DESC(true, "M.lastUpdateDate", false),
        TITLE_ASC(true, "LOWER(M.title)", true), TITLE_DESC(true, "LOWER(M.title)", false),
        AUTHOR_ASC_EMPTY_END(false, "M.author", true), AUTHOR_DESC_EMPTY_END(false, "M.author", false),
        AUTHOR_ASC(true, "LOWER(M.author)", true), AUTHOR_DESC(true, "LOWER(M.author)", false);

        private final boolean applicableOnSQLQuery;
        private final String instructionBase;
        private final boolean asc;

        QUERY_ORDER_BY(final boolean applicableOnSQLQuery, final String instructionBase,
            final boolean asc) {
          this.applicableOnSQLQuery = applicableOnSQLQuery;
          this.instructionBase = instructionBase;
          this.asc = asc;
        }

        public boolean isApplicableOnSQLQuery() {
          return applicableOnSQLQuery;
        }

        public String getInstructionBase() {
          return instructionBase;
        }

        public boolean isAsc() {
          return asc;
        }
      }

      private UserDetail requester;
      private SilverpeasRole componentHighestRequesterRole;
      private String componentInstanceId;
      private final List<String> albumIds = new ArrayList<>();
      private final List<MediaType> mediaTypes = new ArrayList<>();
      private final List<QUERY_ORDER_BY> orderByList = new ArrayList<>();
      private final List<String> identifiers = new ArrayList<>();
      private VISIBILITY visibility = BY_DEFAULT;
      private Date referenceDate = DateUtil.getDate();
      private Integer nbDaysBeforeThatMediaIsNotVisible;
      private int resultLimit = 0;

      private MediaCriteria() {

      }

      /**
       * Initializes media search criteria axed on the given media component instance id.
       * @param componentInstanceId the identifier of the media instance.
       * @return an instance of media criteria based on the specified identifier of component instance.
       */
      public static MediaCriteria fromComponentInstanceId(String componentInstanceId) {
        MediaCriteria criteria = new MediaCriteria();
        criteria.onComponentInstanceId(componentInstanceId);
        return criteria;
      }

      /**
       * Initializes media search criteria axed on the given media identifier.
       * @param mediaId the identifier of the media instance.
       * @return an instance of media criteria based on the specified identifier of media.
       */
      public static MediaCriteria fromMediaId(String mediaId) {
        MediaCriteria criteria = new MediaCriteria();
        criteria.identifierIsOneOf(mediaId);
        return criteria;
      }

      /**
       * Initializes media search criteria axed on the given nb of days before that a media is not
       * visible.
       * @param nbDaysBeforeThatMediaIsNotVisible the nb of days before that a media is not visible.
       * @return an instance of media criteria with the nb of days before that a media is not visible
       * criterion set.
       */
      public static MediaCriteria fromNbDaysBeforeThatMediaIsNotVisible(
          Integer nbDaysBeforeThatMediaIsNotVisible) {
        MediaCriteria criteria = new MediaCriteria();
        criteria.nbDaysBeforeThatMediaIsNotVisible = nbDaysBeforeThatMediaIsNotVisible;
        return criteria;
      }

      /**
       * Sets the criterion of the identifier of the component instance the media must be attached.
       * @param componentInstanceId the identifier of the component instance.
       * @return an instance of media criteria with the instance of component instance criterion set.
       */
      public MediaCriteria onComponentInstanceId(String componentInstanceId) {
        this.componentInstanceId = componentInstanceId;
        return this;
      }

      /**
       * Sets the requester. If no requester is specified to criteria, then
       * {@link UserDetail#getCurrentRequester()} is used.
       * @param requester the requester.
       * @return an instance of media criteria with the requester criterion filled.
       */
      public MediaCriteria setRequester(UserDetail requester) {
        this.requester = requester;
        componentHighestRequesterRole = null;
        return this;
      }

      /**
       * Sets the list of media album identifiers criterion to find media which are attached to one of
       * the given ones.
       * @param albumIds the media album identifier list that the media must be attached.
       * @return the media criteria itself with the new criterion on the media types.
       */
      public MediaCriteria albumIdentifierIsOneOf(String... albumIds) {
        CollectionUtil.addAllIgnoreNull(this.albumIds, albumIds);
        return this;
      }

      /**
       * Sets the list of media type criterion to find media which have their type equals to one of the
       * given ones.
       * @param mediaTypes the media type list that the media type must verify.
       * @return the media criteria itself with the new criterion on the media types.
       */
      public MediaCriteria mediaTypeIsOneOf(MediaType... mediaTypes) {
        CollectionUtil.addAllIgnoreNull(this.mediaTypes, mediaTypes);
        return this;
      }

      /**
       * Configures the order of the media list.
       * @param orderBys the list of order by directives.
       * @return the media criteria itself with the list ordering criterion.
       */
      public MediaCriteria orderedBy(QUERY_ORDER_BY... orderBys) {
        CollectionUtil.addAllIgnoreNull(this.orderByList, orderBys);
        return this;
      }

      /**
       * Sets the identifiers criterion to find the medias with an identifier equals to one of the
       * specified ones.
       * @param identifiers a list of identifiers the medias to find should have.
       * @return the media criteria itself with the new criterion on the media identifiers.
       */
      public MediaCriteria identifierIsOneOf(String... identifiers) {
        CollectionUtil.addAllIgnoreNull(this.identifiers, identifiers);
        return this;
      }

      /**
       * Sets the visibility criterion to find the medias according to their period of visibility. If
       * visibility is {@link VISIBILITY#BY_DEFAULT}, then the requester is verified to get VISIBLE (all
       * user roles) or VISIBLE + HIDDEN (lowest user role must be the publisher one).
       * @param visibility the visibility requested.
       * @return the media criteria itself with the new criterion on the media visibility.
       */
      public MediaCriteria withVisibility(VISIBILITY visibility) {
        if (visibility == null) {
          throw new IllegalArgumentException("visibility parameter must not be null");
        }
        this.visibility = visibility;
        return this;
      }

      /**
       * Sets the reference date criterion (the date of the day by default).
       * @param referenceDate the reference date specified.
       * @return the media criteria itself with the new criterion on the media reference date.
       */
      public MediaCriteria referenceDateOf(Date referenceDate) {
        if (referenceDate == null) {
          throw new IllegalArgumentException("dateReference parameter must not be null");
        }
        this.referenceDate = referenceDate;
        return this;
      }

      /**
       * Limit the number of results.
       * @param nbMedia the maximum media in a result.
       * @return the media criteria itself with the result limit set.
       */
      public MediaCriteria limitResultTo(int nbMedia) {
        resultLimit = nbMedia;
        return this;
      }

      /**
       * Gets the maximum number of media in a result list.
       * @return the result limit.
       */
      public int getResultLimit() {
        return resultLimit;
      }

      /**
       * Gets the identifier of media instance. {@link #fromComponentInstanceId(String)}
       * @return the criterion on the media instance to which the medias should belong.
       */
      public String getComponentInstanceId() {
        return componentInstanceId;
      }

      /**
       * Gets the requester.
       * @return the criterion of requester, {@link UserDetail#getCurrentRequester()} if none.
       */
      private UserDetail getRequester() {
        if (requester == null) {
          return UserDetail.getCurrentRequester();
        }
        return requester;
      }

      private SilverpeasRole getComponentHighestRequesterRole() {
        if (componentHighestRequesterRole == null) {
          Set<SilverpeasRole> requesterRoles = SilverpeasRole.fromStrings(
              OrganizationControllerProvider.getOrganisationController()
                  .getUserProfiles(getRequester().getId(), getComponentInstanceId()));
          componentHighestRequesterRole = SilverpeasRole.getHighestFrom(requesterRoles);
        }
        return componentHighestRequesterRole;
      }

      /**
       * Gets the media album identifier criteria value. {@link #albumIdentifierIsOneOf(String...)}
       * @return the criterion on the album identifiers the medias must be attached.
       */
      private List<String> getAlbumIds() {
        return albumIds;
      }

      /**
       * Gets the media type criteria value. {@link #mediaTypeIsOneOf(MediaType...)}
       * @return the criterion on the status the medias should match.
       */
      private List<MediaType> getMediaTypes() {
        return mediaTypes;
      }

      /**
       * Gets the identifiers criteria value. {@link #identifierIsOneOf(String...)}
       * @return the criterion on the identifiers the medias should match.
       */
      private List<String> getIdentifiers() {
        return identifiers;
      }

      /**
       * Gets the order by directive list.
       * @return the order by directives.
       */
      private List<QUERY_ORDER_BY> getOrderByList() {
        return orderByList;
      }

      /**
       * Gets the visibility criterion.
       * @return the visibility criterion.
       */
      private VISIBILITY getVisibility() {
        return visibility;
      }

      /**
       * Gets the reference date.
       * @return the reference date.
       */
      private Date getReferenceDate() {
        return referenceDate;
      }

      /**
       * Gets the criterion of the nb of days before that a media is not visible.
       * @return the nb of days before that a media is not visible.
       */
      public Integer getNbDaysBeforeThatMediaIsNotVisible() {
        return nbDaysBeforeThatMediaIsNotVisible;
      }

      /**
       * Processes these criteria with the specified processor. It chains in a given order the different
       * criterion to process.
       * @param processor the processor to use for processing each criterion in these criteria.
       */
      public void processWith(final MediaCriteriaProcessor processor) {
        processor.startProcessing();
        boolean isComponentCriteriaDefined = StringUtil.isDefined(getComponentInstanceId());
        if (isComponentCriteriaDefined) {
          processor.processComponentInstance(getComponentInstanceId());
        }
        UserDetail creatorForVisibility = null;
        VISIBILITY theVisibility = getVisibility();
        if (getRequester() != null) {
          if (theVisibility == BY_DEFAULT &&
              (getRequester().isAccessAdmin() ||
              (isComponentCriteriaDefined && getComponentHighestRequesterRole() != null &&
              getComponentHighestRequesterRole()
                  .isGreaterThanOrEquals(SilverpeasRole.PUBLISHER)))) {
            theVisibility = FORCE_GET_ALL;
          } else if (isComponentCriteriaDefined &&
              getComponentHighestRequesterRole() == SilverpeasRole.WRITER) {
            creatorForVisibility = getRequester();
          }
        }
        processor.then().processVisibility(theVisibility, getReferenceDate(), creatorForVisibility);
        if (!getAlbumIds().isEmpty()) {
          processor.then().processAlbums(getAlbumIds());
        }
        if (!getIdentifiers().isEmpty()) {
          processor.then().processIdentifiers(getIdentifiers());
        }
        if (!getMediaTypes().isEmpty()) {
          processor.then().processMediaTypes(getMediaTypes());
        }
        if (getNbDaysBeforeThatMediaIsNotVisible() != null) {
          processor.then().processNbDaysBeforeThatMediaIsNotVisible(getReferenceDate(),
              getNbDaysBeforeThatMediaIsNotVisible());
        }
        if (!getOrderByList().isEmpty()) {
          processor.then().processOrdering(getOrderByList());
        }

        // Configuration
        processor.processResultLimit(getResultLimit());

        processor.endProcessing();
      }
    }