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Added Kotlin demo: positions.

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I also reworked how the Java and Kotlin demos
process errors in the command line arguments.
Using exceptions that are caught by main() rather
than directly exiting the process where the errors
are detected.
This commit is contained in:
Don Cross
2022-05-02 11:28:16 -04:00
parent 551ce7a249
commit 237bc42084
6 changed files with 145 additions and 29 deletions
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65
demo/java/src/main/java/io/github/cosinekitty/astronomy/demo/Main.java
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@@ -23,10 +23,17 @@ public class Main {
" current date and time.",
"",
" seasons year",
" Given an integer year number, display the solstices and equinoxes for that year.",
" Given an integer year number, displays the solstices and equinoxes for that year.",
" The year must be in the range 0000..9999.",
""
);
private static class DemoException extends Exception {
public DemoException(String message) {
super(message);
}
}
public static void main(String[] args) {
int rc = 1;
if (args.length == 0) {
@@ -51,7 +58,10 @@ public class Main {
System.out.printf("ERROR: Unknown command '%s'.%n", verb);
}
} catch (DateTimeParseException e) {
System.out.println("FATAL: Invalid date/time syntax.");
System.out.println("ERROR: Invalid date/time format on command line.");
rc = 1;
} catch (DemoException e) {
System.out.printf("ERROR: %s%n", e.getMessage());
rc = 1;
}
}
@@ -67,44 +77,38 @@ public class Main {
return Time.fromMillisecondsSince1970(millis);
}
private static double parseNumber(String name, String text, double minValue, double maxValue) {
double value = Double.NaN;
private static double parseNumber(String name, String text, double minValue, double maxValue) throws DemoException {
try {
value = Double.parseDouble(text);
if (value < minValue || value > maxValue) {
System.out.printf("ERROR: Value is out of range for %s.%n", name);
System.exit(1);
double value = Double.parseDouble(text);
if (!Double.isFinite(value) || value < minValue || value > maxValue) {
throw new DemoException(String.format("Value is out of range for %s.", name));
}
return value;
} catch (NumberFormatException e) {
System.out.printf("ERROR: Invalid numeric format '%s' for %s.%n", text, name);
System.exit(1);
throw new DemoException(String.format("Invalid numeric format '%s' for %s.%n", text, name));
}
return value;
}
private static int parseYear(String text) {
int year = -1;
private static int parseYear(String text) throws DemoException {
try {
year = Integer.parseInt(text);
int year = Integer.parseInt(text);
if (year < 0 || year > 9999) {
System.out.println("ERROR: Year must be in the range 0000..9999.");
System.exit(1);
throw new DemoException("Year must be in the range 0000..9999.");
}
return year;
} catch (NumberFormatException e) {
System.out.printf("ERROR: Invalid numeric format '%s' for year.%n", text);
System.exit(1);
throw new DemoException(String.format("Invalid numeric format '%s' for year.", text));
}
return year;
}
private static Observer parseObserver(String[] args, int index) {
private static Observer parseObserver(String[] args, int index) throws DemoException {
double latitude = parseNumber("latitude", args[index], -90.0, +90.0);
double longitude = parseNumber("longitude", args[index+1], -180.0, +180.0);
return new Observer(latitude, longitude, 0.0);
}
private static interface DemoRunner {
public int run(String[] args);
public int run(String[] args) throws DemoException;
}
private static class Demo {
@@ -122,8 +126,21 @@ public class Main {
}
private static Demo[] demoList = new Demo[] {
new Demo("moonphase", 1, 2, args -> MoonPhase.run(parseTime(args, 1))),
new Demo("positions", 3, 4, args -> Positions.run(parseObserver(args, 1), parseTime(args, 3))),
new Demo("seasons", 2, 2, args -> Seasons.run(parseYear(args[1])))
new Demo("moonphase", 1, 2, args ->
MoonPhase.run(
parseTime(args, 1)
)
),
new Demo("positions", 3, 4, args ->
Positions.run(
parseObserver(args, 1),
parseTime(args, 3)
)
),
new Demo("seasons", 2, 2, args ->
Seasons.run(
parseYear(args[1])
)
)
};
}