UnitsCache.java
- /* Copyright 2002-2023 CS GROUP
- * Licensed to CS GROUP (CS) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * CS licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- package org.orekit.utils.units;
- import java.util.HashMap;
- import java.util.Map;
- /** Cache for parsed units.
- * @author Luc Maisonobe
- * @since 11.0
- */
- public class UnitsCache {
- /** Parsed units cache. */
- private final Map<String, Unit> cache;
- /** Simple constructor.
- */
- public UnitsCache() {
- this.cache = new HashMap<>();
- }
- /** Get units from a string specification.
- * <p>
- * Parsing is performed only the first time a specification is
- * encountered, so the cache speeds up cases where the same
- * units is encountered many times (for example when parsing
- * CCSDS messages with many entries).
- * </p>
- * @param specification units specification (may be null)
- * @return parsed units ({@link Unit#NONE} if specification is null)
- */
- public Unit getUnits(final String specification) {
- if (specification == null) {
- return Unit.NONE;
- }
- Unit cached = cache.get(specification);
- if (cached == null) {
- cached = Unit.parse(specification);
- cache.put(specification, cached);
- }
- return cached;
- }
- }