au.gov.amsa.risky.format.BinaryFixesUtil Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of formats Show documentation

There is a newer version: 0.6.19

package au.gov.amsa.risky.format;

import static java.util.Optional.empty;
import static java.util.Optional.of;

import java.io.File;
import java.nio.ByteBuffer;
import java.util.Optional;

public class BinaryFixesUtil {

	static FixImpl toFix(int mmsi, ByteBuffer bb) {
		float lat = bb.getFloat();
		float lon = bb.getFloat();
		long time = bb.getLong();
		int latency = bb.getInt();
		final Optional latencySeconds;
		if (latency == -1)
			latencySeconds = empty();
		else
			latencySeconds = of(latency);
		short src = bb.getShort();
		final Optional source;
		if (src == 0)
			source = empty();
		else
			source = of(src);
		byte nav = bb.get();
		final Optional navigationalStatus;
		if (nav == Byte.MAX_VALUE)
			navigationalStatus = empty();
		else
			navigationalStatus = of(NavigationalStatus.values()[nav]);

		// rate of turn
		bb.get();

		short sog = bb.getShort();
		final Optional speedOverGroundKnots;
		if (sog == BinaryFixes.SOG_ABSENT)
			speedOverGroundKnots = empty();
		else
			speedOverGroundKnots = of(sog / 10f);

		short cog = bb.getShort();
		final Optional courseOverGroundDegrees;
		if (cog == BinaryFixes.COG_ABSENT)
			courseOverGroundDegrees = empty();
		else
			courseOverGroundDegrees = of(cog / 10f);

		short heading = bb.getShort();
		final Optional headingDegrees;
		if (heading == BinaryFixes.HEADING_ABSENT)
			headingDegrees = empty();
		else
			headingDegrees = of(heading / 10f);
		byte cls = bb.get();
		final AisClass aisClass;
		if (cls == 0)
			aisClass = AisClass.A;
		else
			aisClass = AisClass.B;
		FixImpl fix = new FixImpl(mmsi, lat, lon, time, latencySeconds, source, navigationalStatus,
				speedOverGroundKnots, courseOverGroundDegrees, headingDegrees, aisClass);
		return fix;
	}

	static int getMmsi(File file) {
		int finish = file.getName().indexOf('.');
		String id = file.getName().substring(0, finish);
		return Integer.parseInt(id);
	}
}