org.openmrs.module.clinicalsummary.rule.reminder.adult.general.FallingWeightReminderRule.java Source code

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Here is the source code for org.openmrs.module.clinicalsummary.rule.reminder.adult.general.FallingWeightReminderRule.java

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/**
 * The contents of this file are subject to the OpenMRS Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://license.openmrs.org
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * Copyright (C) OpenMRS, LLC.  All Rights Reserved.
 */

package org.openmrs.module.clinicalsummary.rule.reminder.adult.general;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.openmrs.api.context.Context;
import org.openmrs.logic.LogicContext;
import org.openmrs.logic.LogicException;
import org.openmrs.logic.result.Result;
import org.openmrs.module.clinicalsummary.rule.EvaluableConstants;
import org.openmrs.module.clinicalsummary.rule.EvaluableNameConstants;
import org.openmrs.module.clinicalsummary.rule.EvaluableRule;
import org.openmrs.module.clinicalsummary.rule.observation.ObsWithRestrictionRule;
import org.openmrs.module.clinicalsummary.rule.observation.ObsWithStringRestrictionRule;
import org.openmrs.module.clinicalsummary.rule.reminder.ReminderParameters;

import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.Map;

public class FallingWeightReminderRule extends EvaluableRule {

    private static final Log log = LogFactory.getLog(FallingWeightReminderRule.class);

    public static final String TOKEN = "Falling Weight Reminder";

    /**
     * @see org.openmrs.logic.Rule#eval(org.openmrs.logic.LogicContext, Integer, java.util.Map)
     */
    @Override
    protected Result evaluate(final LogicContext context, final Integer patientId,
            final Map<String, Object> parameters) throws LogicException {

        Result result = new Result();
        ObsWithRestrictionRule obsWithRestrictionRule = new ObsWithStringRestrictionRule();
        parameters.put(EvaluableConstants.OBS_FETCH_SIZE, 2);
        parameters.put(EvaluableConstants.OBS_CONCEPT, Arrays.asList(EvaluableNameConstants.WEIGHT_KG));
        Result weightResults = obsWithRestrictionRule.eval(context, patientId, parameters);
        // only process when we have at least two results
        if (CollectionUtils.size(weightResults) >= 2) {
            // we already know there's at least two results, so we can use the magic number here to get last and second from last result
            Result firstWeightResult = weightResults.get(0);
            Result secondWeightResult = weightResults.get(1);
            Double weightDrop = secondWeightResult.toNumber() - firstWeightResult.toNumber();
            Double weightDropPercentage = weightDrop / secondWeightResult.toNumber();

            Calendar calendar = Calendar.getInstance();
            calendar.setTime(firstWeightResult.getResultDate());
            calendar.add(Calendar.MONTH, -6);
            Date sixMonthsBefore = calendar.getTime();
            if (weightDropPercentage > 0.1 && secondWeightResult.getResultDate().after(sixMonthsBefore)) {
                result.add(new Result(String.valueOf(parameters.get(ReminderParameters.DISPLAYED_REMINDER_TEXT))));
            }
        }

        return result;
    }

    /**
     * @see org.openmrs.logic.Rule#getDependencies()
     */
    @Override
    public String[] getDependencies() {
        return new String[] { ObsWithStringRestrictionRule.TOKEN };
    }

    /**
     * Get the token name of the rule that can be used to reference the rule from LogicService
     *
     * @return the token name
     */
    @Override
    protected String getEvaluableToken() {
        return TOKEN;
    }
}