org.apache.metron.profiler.spark.TimestampParser.java Source code

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Here is the source code for org.apache.metron.profiler.spark.TimestampParser.java

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/*
 * 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.metron.profiler.spark;

import org.apache.commons.lang3.StringUtils;

import java.time.Instant;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.util.Optional;

/**
 * Parses an input string and returns a timestamp in epoch milliseconds.
 */
public class TimestampParser {

    /**
     * Parses an input string and returns an optional timestamp in epoch milliseconds.
     *
     * @param inputString The input defining a timestamp.
     * @return A timestamp in epoch milliseconds.
     */
    public Optional<Long> parse(String inputString) {
        Optional<Long> epochMilli = Optional.empty();

        // a blank is acceptable and treated as undefined
        if (StringUtils.isNotBlank(inputString)) {
            epochMilli = Optional.of(new DateTimeFormatterBuilder().append(DateTimeFormatter.ISO_INSTANT)
                    .toFormatter().parse(inputString, Instant::from).toEpochMilli());
        }

        return epochMilli;
    }

}