001/*
002 * SPDX-License-Identifier: Apache-2.0
003 *
004 * Copyright 2025-2026 The Enola <https://enola.dev> Authors
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 *     https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package dev.enola.common.time;
019
020import dev.enola.common.context.TLC;
021
022import java.time.Instant;
023import java.time.InstantSource;
024
025/**
026 * InstantSourceTLC is an {@link InstantSource} which checks if there is an {@link InstantSource}
027 * available in the {@link TLC}, and otherwise uses the {@link InstantSource#system()}.
028 *
029 * <p>Use this as InstanceSource so that tests can set a fixed Instant.
030 */
031public class InstantSourceTLC implements InstantSource {
032
033    @Override
034    public Instant instant() {
035        return TLC.optional(InstantSource.class).orElse(InstantSource.system()).instant();
036    }
037}