mailbox/opensearch/src/main/java/org/apache/james/mailbox/opensearch/query/SortConverter.java

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 * to you under the Apache License, Version 2.0 (the            *
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package org.apache.james.mailbox.opensearch.query;

import org.apache.james.backends.opensearch.IndexCreationFactory;
import org.apache.james.mailbox.model.SearchQuery;
import org.apache.james.mailbox.opensearch.json.JsonMessageConstants;
import org.opensearch.search.sort.FieldSortBuilder;
import org.opensearch.search.sort.SortBuilders;
import org.opensearch.search.sort.SortMode;
import org.opensearch.search.sort.SortOrder;

public class SortConverter {

    private static final String PATH_SEPARATOR = ".";

    public static FieldSortBuilder convertSort(SearchQuery.Sort sort) {
        return getSortClause(sort.getSortClause())
            .order(getOrder(sort))
            .sortMode(SortMode.MIN);
    }

    private static FieldSortBuilder getSortClause(SearchQuery.Sort.SortClause clause) {
        switch (clause) {
            case Arrival :
                return SortBuilders.fieldSort(JsonMessageConstants.DATE);
            case MailboxCc :
                return SortBuilders.fieldSort(JsonMessageConstants.CC + PATH_SEPARATOR + JsonMessageConstants.EMailer.ADDRESS
                    + PATH_SEPARATOR + IndexCreationFactory.RAW);
            case MailboxFrom :
                return SortBuilders.fieldSort(JsonMessageConstants.FROM + PATH_SEPARATOR + JsonMessageConstants.EMailer.ADDRESS
                    + PATH_SEPARATOR + IndexCreationFactory.RAW);
            case MailboxTo :
                return SortBuilders.fieldSort(JsonMessageConstants.TO + PATH_SEPARATOR + JsonMessageConstants.EMailer.ADDRESS
                    + PATH_SEPARATOR + IndexCreationFactory.RAW);
            case BaseSubject :
                return SortBuilders.fieldSort(JsonMessageConstants.SUBJECT + PATH_SEPARATOR + IndexCreationFactory.RAW);
            case Size :
                return SortBuilders.fieldSort(JsonMessageConstants.SIZE);
            case SentDate :
                return SortBuilders.fieldSort(JsonMessageConstants.SENT_DATE);
            case Uid :
                return SortBuilders.fieldSort(JsonMessageConstants.UID);
            case Id:
                return SortBuilders.fieldSort(JsonMessageConstants.MESSAGE_ID);
            default:
                throw new RuntimeException("Sort is not implemented");
        }
    }

    private static SortOrder getOrder(SearchQuery.Sort sort) {
        if (sort.isReverse()) {
            return SortOrder.DESC;
        } else {
            return SortOrder.ASC;
        }
    }
}