org.kuali.rice.krms.framework.engine.expression.DateComparisonOperator.java Source code

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Here is the source code for org.kuali.rice.krms.framework.engine.expression.DateComparisonOperator.java

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/*-
 * #%L
 * %%
 * Copyright (C) 2005 - 2019 Kuali, Inc. - All Rights Reserved
 * %%
 * You may use and modify this code under the terms of the Kuali, Inc.
 * Pre-Release License Agreement. You may not distribute it.
 * 
 * You should have received a copy of the Kuali, Inc. Pre-Release License
 * Agreement with this file. If not, please write to license@kuali.co.
 * #L%
 */
package org.kuali.rice.krms.framework.engine.expression;

import java.text.ParseException;
import java.util.Date;

import org.apache.commons.lang3.StringUtils;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;
import org.kuali.rice.core.api.datetime.DateTimeService;
import org.kuali.rice.krms.api.engine.IncompatibleTypeException;

public class DateComparisonOperator implements EngineComparatorExtension, StringCoercionExtension {

    private Logger LOG = LogManager.getLogger(DateComparisonOperator.class);

    private DateTimeService dateTimeService;

    public boolean canCoerce(String type, String value) {
        return coerce(type, value) != null;
    }

    @Override
    public Object coerce(String type, String value) {
        try {
            if (StringUtils.equals(type, java.util.Date.class.getCanonicalName())) {
                return dateTimeService.convertToDate(value);
            } else if (StringUtils.equals(type, java.sql.Date.class.getCanonicalName())) {
                return dateTimeService.convertToSqlDate(value);
            } else if (StringUtils.equals(type, java.sql.Timestamp.class.getCanonicalName())) {
                return dateTimeService.convertToSqlTimestamp(value);
            } else if (StringUtils.equals(type, java.sql.Time.class.getCanonicalName())) {
                return dateTimeService.convertToSqlTime(value);
            } else {
                return null;
            }
        } catch (ParseException e) {
            LOG.info("Unable to parse '" + value + "' into know date/time", e);
            return null;
        }
    }

    public DateTimeService getDateTimeService() {
        return dateTimeService;
    }

    public void setDateTimeService(DateTimeService dateTimeService) {
        this.dateTimeService = dateTimeService;
    }

    @Override
    public int compare(Object lhs, Object rhs) {
        if (lhs == null && rhs == null) {
            return 0;
        } else if (lhs == null) {
            return -1;
        } else if (rhs == null) {
            return 1;
        }

        Long lhsTime = ((Date) lhs).getTime();
        Long rhsTime;
        if (rhs instanceof Date) {
            rhsTime = ((Date) rhs).getTime();
        } else if (rhs instanceof String) {
            rhsTime = ((Date) coerce(lhs.getClass().getCanonicalName(), (String) rhs)).getTime();
        } else {
            throw new IncompatibleTypeException("Expected Date or String rhs and therefore unable to compare lhs("
                    + lhs.getClass().getCanonicalName() + ") and rhs(" + rhs.getClass().getCanonicalName() + ")");
        }

        return lhsTime.compareTo(rhsTime);
    }

    @Override
    public boolean canCompare(Object lhs, Object rhs) {
        return isDateType(lhs) && (isDateType(rhs)
                || (rhs instanceof String && canCoerce(lhs.getClass().getCanonicalName(), (String) rhs)));
    }

    protected boolean isDateType(Object lhs) {
        return lhs instanceof java.util.Date || lhs instanceof java.sql.Date || lhs instanceof java.sql.Timestamp
                || lhs instanceof java.sql.Time;
    }

}