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52°North SOS - Module to support split and merge observations
There is a newer version: 6.0.1
/*
 * Copyright (C) 2012-2021 52°North Spatial Information Research GmbH
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * If the program is linked with libraries which are licensed under one of
 * the following licenses, the combination of the program with the linked
 * library is not considered a "derivative work" of the program:
 *
 *     - Apache License, version 2.0
 *     - Apache Software License, version 1.0
 *     - GNU Lesser General Public License, version 3
 *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
 *     - Common Development and Distribution License (CDDL), version 1.0
 *
 * Therefore the distribution of the program linked with libraries licensed
 * under the aforementioned licenses, is permitted by the copyright holders
 * if the distribution is compliant with both the GNU General Public
 * License version 2 and the aforementioned licenses.
 *
 * 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 General
 * Public License for more details.
 */
package org.n52.sos.converter;

import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.n52.iceland.convert.RequestResponseModifier;
import org.n52.iceland.convert.RequestResponseModifierFacilitator;
import org.n52.iceland.convert.RequestResponseModifierKey;
import org.n52.shetland.aqd.AqdConstants;
import org.n52.shetland.ogc.om.ObservationMergeIndicator;
import org.n52.shetland.ogc.om.OmObservation;
import org.n52.shetland.ogc.ows.exception.OwsExceptionReport;
import org.n52.shetland.ogc.ows.service.OwsServiceRequest;
import org.n52.shetland.ogc.ows.service.OwsServiceResponse;
import org.n52.shetland.ogc.sos.request.GetObservationRequest;
import org.n52.shetland.ogc.sos.response.GetObservationResponse;
import org.n52.shetland.ogc.swe.SweDataArray;

public class AqdSplitMergeObservations implements RequestResponseModifier {

    private static final Set REQUEST_RESPONSE_MODIFIER_KEY_TYPES =
            new HashSet<>(Arrays.asList(
                    new RequestResponseModifierKey(AqdConstants.AQD, AqdConstants.VERSION,
                            new GetObservationRequest()),
                    new RequestResponseModifierKey(AqdConstants.AQD, AqdConstants.VERSION, new GetObservationRequest(),
                            new GetObservationResponse())));

    @Override
    public Set getKeys() {
        return Collections.unmodifiableSet(REQUEST_RESPONSE_MODIFIER_KEY_TYPES);
    }

    @Override
    public OwsServiceRequest modifyRequest(OwsServiceRequest request) throws OwsExceptionReport {
        return request;
    }

    @Override
    public OwsServiceResponse modifyResponse(OwsServiceRequest request, OwsServiceResponse response)
            throws OwsExceptionReport {
        if (response instanceof GetObservationResponse) {
            ObservationMergeIndicator indicator =
                    ObservationMergeIndicator.sameObservationConstellation().withoutObservationType();
            GetObservationResponse observationResponse = (GetObservationResponse) response;
            observationResponse.setMergeObservations(true);
            observationResponse
                    .setObservationCollection(observationResponse.getObservationCollection().merge(indicator));
        }
        return response;
    }

    private void mergeObservationValues(OmObservation combinedSosObs, OmObservation sosObservation) {
        mergeValues(combinedSosObs, sosObservation);
        mergeResultTimes(combinedSosObs, sosObservation);
    }

    private void mergeValues(OmObservation combinedSosObs, OmObservation sosObservation) {
        SweDataArray combinedValue = (SweDataArray) combinedSosObs.getValue().getValue().getValue();
        SweDataArray value = (SweDataArray) sosObservation.getValue().getValue().getValue();
        if (value.isSetValues()) {
            combinedValue.addAll(value.getValues());
        }
    }

    /**
     * Merge result time with passed observation result time
     *
     * @param combinedSosObs
     *            Merged observation
     * @param sosObservation the observation to merge
     */
    private void mergeResultTimes(final OmObservation combinedSosObs, OmObservation sosObservation) {
        if (combinedSosObs.isSetResultTime() && sosObservation.isSetResultTime()) {
            if (combinedSosObs.getResultTime().getValue().isBefore(sosObservation.getResultTime().getValue())) {
                combinedSosObs.setResultTime(sosObservation.getResultTime());
            }
        } else if (!combinedSosObs.isSetResultTime() && sosObservation.isSetResultTime()) {
            combinedSosObs.setResultTime(sosObservation.getResultTime());
        }
    }

    @Override
    public RequestResponseModifierFacilitator getFacilitator() {
        return new RequestResponseModifierFacilitator().setMerger(true).setSplitter(true);
    }

}