flink-spector-master/flinkspector-datastream/src/main/java/io/flinkspector/datastream/input/time/Before.java
/*
 * Copyright 2015 Otto (GmbH & Co KG)
 *
 * Licensed 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 io.flinkspector.datastream.input.time;

import java.util.concurrent.TimeUnit;

/**
 * Helper for defining a time span between to StreamRecords
 */
public class Before extends TimeSpan {

    private long timeSpan;

    private Before(long time, TimeUnit timeUnit) {
        this.timeSpan = timeUnit.toMillis(time);
    }

    public static Before period(long time, TimeUnit timeUnit) {
        return new Before(time, timeUnit);
    }

    /**
     * Getter for defined time span
     *
     * @return time span in milliseconds
     */
    @Override
    public long getTimeSpan() {
        return timeSpan * -1;
    }
}
