com.dataartisans.timeoutmonitoring.TimestampExtractorFunction.java Source code

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Here is the source code for com.dataartisans.timeoutmonitoring.TimestampExtractorFunction.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 com.dataartisans.timeoutmonitoring;

import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.json.JSONObject;

import java.io.IOException;
import java.io.ObjectInputStream;

public class TimestampExtractorFunction implements Function<JSONObject, Long> {

    private final String timestampField;
    private final String pattern;
    private transient DateTimeFormatter formatter;

    public TimestampExtractorFunction(String timestampField, String pattern) {
        this.timestampField = timestampField;
        this.pattern = pattern;
        formatter = DateTimeFormat.forPattern(pattern);
    }

    @Override
    public Long apply(JSONObject jsonObject) {
        String timestamp = jsonObject.optString(timestampField);

        if (timestamp == null) {
            return Long.MIN_VALUE;
        } else {
            DateTime dateTime = formatter.parseDateTime(timestamp);
            return dateTime.getMillis();
        }
    }

    private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
        ois.defaultReadObject();
        formatter = DateTimeFormat.forPattern(pattern);
    }
}