Github user rmetzger commented on a diff in the pull request:
https://github.com/apache/flink/pull/1536#discussion_r50401470
--- Diff:
flink-examples/flink-examples-batch/src/main/java/org/apache/flink/examples/java/clustering/KMeans.java
---
@@ -291,31 +297,54 @@ public Centroid map(Tuple3<Integer, Point, Long>
value) {
private static String centersPath = null;
private static String outputPath = null;
private static int numIterations = 10;
-
- private static boolean parseParameters(String[] programArguments) {
-
- if(programArguments.length > 0) {
- // parse input arguments
+
+ private static final Option POINTS_PATH_OPTION =
+ new Option("points").alt("P").help("The path to the input
points");
+ private static final Option CENTERS_PATH_OPTION =
+ new Option("centroids").alt("C").help("The path to the input
centroids");
+ private static final Option OUTPUT_PATH_OPTION =
+ new Option("output").alt("O").help("The path where the output
will be written");
+ private static final Option NUM_ITERATIONS_OPTION =
+ new Option("iterations").alt("I").help("The number of iteration
performed by the K-Means algorithm");
+
+ private static boolean parseParameters(final ParameterTool params)
throws RequiredParametersException {
+
+ final RequiredParameters requiredParameters = new
RequiredParameters();
+ boolean parseStatus = false;
+
+ requiredParameters.add(POINTS_PATH_OPTION);
+ requiredParameters.add(CENTERS_PATH_OPTION);
+ requiredParameters.add(OUTPUT_PATH_OPTION);
+ requiredParameters.add(NUM_ITERATIONS_OPTION);
+
+ try {
+ requiredParameters.applyTo(params);
+ pointsPath = params.get(POINTS_PATH_OPTION.getName());
+ centersPath = params.get(CENTERS_PATH_OPTION.getName());
+ outputPath = params.get(OUTPUT_PATH_OPTION.getName());
+ numIterations =
params.getInt(NUM_ITERATIONS_OPTION.getName());
fileOutput = true;
- if(programArguments.length == 4) {
- pointsPath = programArguments[0];
- centersPath = programArguments[1];
- outputPath = programArguments[2];
- numIterations =
Integer.parseInt(programArguments[3]);
+ parseStatus = true;
+ } catch (RequiredParametersException e) {
+ if (params.getNumberOfParameters() == 0) {
+ printRunWithDefaultParams();
+ parseStatus = true;
} else {
- System.err.println("Usage: KMeans <points path>
<centers path> <result path> <num iterations>");
- return false;
+
System.out.println(requiredParameters.getHelp(e.getMissingArguments()));
}
- } else {
- System.out.println("Executing K-Means example with
default parameters and built-in default data.");
- System.out.println(" Provide parameters to read input
data from files.");
- System.out.println(" See the documentation for the
correct format of input files.");
- System.out.println(" We provide a data generator to
create synthetic input files for this program.");
- System.out.println(" Usage: KMeans <points path>
<centers path> <result path> <num iterations>");
}
- return true;
+
+ return parseStatus;
}
-
+
+ private static void printRunWithDefaultParams() {
+ System.out.println("Executing K-Means example with default
parameters and built-in default data.");
+ System.out.println(" Provide parameters to read input data
from files.");
+ System.out.println(" See the documentation for the correct
format of input files.");
+ System.out.println(" We provide a data generator to create
synthetic input files for this program.");
+ System.out.println(" Usage: KMeans --points <points path>
--centroids <centers path> --output <result path> --iterations <num
iterations>");
--- End diff --
I think you can generate the usage information from the required parameters
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