tri.timeseries.io.TimeSeriesFileFormat.kt Maven / Gradle / Ivy

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/*-
 * #%L
 * coda-data
 * --
 * Copyright (C) 2020 - 2022 Elisha Peterson
 * --
 * 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.
 * #L%
 */
package tri.timeseries.io

import tri.timeseries.TimeSeries
import tri.util.toLocalDate
import java.io.*
import java.net.URL
import java.nio.charset.Charset
import kotlin.math.roundToInt

/** Writes to/from files, with one series per row, similar to a CSV format. */
object TimeSeriesFileFormat {

    /** Reads several series from a file. */
    fun readSeries(file: File, charset: Charset) = BufferedReader(FileReader(file)).useLines { it.map { readSeries(it) }.toList() }

    /** Reads several series from a file. */
    fun readSeries(url: URL, charset: Charset) = BufferedReader(InputStreamReader(url.openStream(), charset)).useLines { it.map { readSeries(it) }.toList() }

    /** Reads several series from an input stream. */
    fun readSeries(inputStream: InputStream, charset: Charset) = BufferedReader(InputStreamReader(inputStream, charset)).useLines { it.map { readSeries(it) }.toList() }

    /** Writes several series to the writer. */
    fun writeSeries(m: List, out: OutputStream, charset: Charset) =
        PrintStream(out, false, charset).use { ps ->
            m.forEach { writeSeries(it, ps) }
        }

    /** Writes a single series to the writer. */
    fun writeSeries(m: TimeSeries, out: PrintStream) {
        out.println(writeSeriesAsString(m))
    }

    /** Writes a single series to the writer. */
    fun writeSeriesAsString(m: TimeSeries) =
            (listOf(m.source, m.areaId, m.metric, m.qualifier, m.intSeries, if (m.intSeries) m.defValue.toInt() else m.defValue, m.start)
                    + (if (m.intSeries) m.values.map { it.roundToInt() } else m.values)).joinToString("\t")

    /** Reads a series from a writer line. */
    fun readSeries(line: String): TimeSeries {
        val split = line.split("\t")
        return TimeSeries(split[0], split[1], split[2], split[3], split[4].toBoolean(), split[5].toDouble(), split[6].toLocalDate(),
                split.subList(7, split.size).map { it.toDouble() })
    }

}