001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.core.util;
018
019/**
020 * Implementation of the {@code NanoClock} interface that always returns a fixed value.
021 */
022public final class DummyNanoClock implements NanoClock {
023
024    private final long fixedNanoTime;
025
026    public DummyNanoClock() {
027        this(0L);
028    }
029
030    /**
031     * Constructs a new DummyNanoClock with the specified value to return.
032     * @param fixedNanoTime the value to return from {@link #nanoTime()}.
033     */
034    public DummyNanoClock(final long fixedNanoTime) {
035        this.fixedNanoTime = fixedNanoTime;
036    }
037
038    /**
039     * Returns the constructor value.
040     *
041     * @return the constructor value
042     */
043    @Override
044    public long nanoTime() {
045        return fixedNanoTime;
046    }
047
048}