001package ca.uhn.fhir.util;
002
003/*-
004 * #%L
005 * HAPI FHIR - Core Library
006 * %%
007 * Copyright (C) 2014 - 2022 Smile CDR, Inc.
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023import ca.uhn.fhir.rest.param.DateRangeParam;
024
025import javax.annotation.Nonnull;
026import javax.annotation.Nullable;
027import java.util.Date;
028
029public class DateRangeUtil {
030
031        /**
032         * Narrow the DateRange to be within theStartInclusive, and theEndExclusive, if provided.
033         * @param theDateRangeParam the initial range, null for unconstrained
034         * @param theStartInclusive a lower bound to apply, or null for unchanged.
035         * @param theEndExclusive an upper bound to apply, or null for unchanged.
036         * @return a DateRange within the original range, and between theStartInclusive and theEnd
037         */
038        @Nonnull
039        public static DateRangeParam narrowDateRange(@Nullable DateRangeParam theDateRangeParam, @Nullable Date theStartInclusive, @Nullable Date theEndExclusive) {
040                if (theStartInclusive == null && theEndExclusive == null) {
041                        return theDateRangeParam;
042                }
043                DateRangeParam result = theDateRangeParam==null?new DateRangeParam():new DateRangeParam(theDateRangeParam);
044
045                if (theStartInclusive != null) {
046                        Date inputStart = result.getLowerBoundAsInstant();
047                        if (theDateRangeParam == null || inputStart == null || inputStart.before(theStartInclusive)) {
048                                result.setLowerBoundInclusive(theStartInclusive);
049                        }
050                }
051                if (theEndExclusive != null) {
052                        Date inputEnd = result.getUpperBound() == null? null : result.getUpperBound().getValue();
053                        if (theDateRangeParam == null || inputEnd == null || inputEnd.after(theEndExclusive)) {
054                                result.setUpperBoundExclusive(theEndExclusive);
055                        }
056                }
057
058                return result;
059        }
060
061}