log4j-core/src/main/java/org/apache/logging/log4j/core/time/internal/DummyNanoClock.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.apache.logging.log4j.core.time.internal;

import org.apache.logging.log4j.core.time.NanoClock;

/**
 * Implementation of the {@code NanoClock} interface that always returns a fixed value.
 */
public final class DummyNanoClock implements NanoClock {

    private final long fixedNanoTime;

    public DummyNanoClock() {
        this(0L);
    }

    /**
     * Constructs a new DummyNanoClock with the specified value to return.
     * @param fixedNanoTime the value to return from {@link #nanoTime()}.
     */
    public DummyNanoClock(final long fixedNanoTime) {
        this.fixedNanoTime = fixedNanoTime;
    }

    /**
     * Returns the constructor value.
     *
     * @return the constructor value
     */
    @Override
    public long nanoTime() {
        return fixedNanoTime;
    }

}