001/*-
002 * #%L
003 * HAPI FHIR - Core Library
004 * %%
005 * Copyright (C) 2014 - 2023 Smile CDR, Inc.
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 *
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package ca.uhn.fhir.util;
021
022import ca.uhn.fhir.rest.param.DateRangeParam;
023
024import javax.annotation.Nonnull;
025import javax.annotation.Nullable;
026import java.util.Date;
027
028public class DateRangeUtil {
029
030        /**
031         * Narrow the DateRange to be within theStartInclusive, and theEndExclusive, if provided.
032         * @param theDateRangeParam the initial range, null for unconstrained
033         * @param theStartInclusive a lower bound to apply, or null for unchanged.
034         * @param theEndExclusive an upper bound to apply, or null for unchanged.
035         * @return a DateRange within the original range, and between theStartInclusive and theEnd
036         */
037        @Nonnull
038        public static DateRangeParam narrowDateRange(@Nullable DateRangeParam theDateRangeParam, @Nullable Date theStartInclusive, @Nullable Date theEndExclusive) {
039                if (theStartInclusive == null && theEndExclusive == null) {
040                        return theDateRangeParam;
041                }
042                DateRangeParam result = theDateRangeParam==null?new DateRangeParam():new DateRangeParam(theDateRangeParam);
043
044                if (theStartInclusive != null) {
045                        Date inputStart = result.getLowerBoundAsInstant();
046                        if (theDateRangeParam == null || inputStart == null || inputStart.before(theStartInclusive)) {
047                                result.setLowerBoundInclusive(theStartInclusive);
048                        }
049                }
050                if (theEndExclusive != null) {
051                        Date inputEnd = result.getUpperBound() == null? null : result.getUpperBound().getValue();
052                        if (theDateRangeParam == null || inputEnd == null || inputEnd.after(theEndExclusive)) {
053                                result.setUpperBoundExclusive(theEndExclusive);
054                        }
055                }
056
057                return result;
058        }
059
060}