[jira] [Created] (FLINK-2621) Add support for positional arguments to ParameterTool

[Shang Yuanchun (Jira)]

Behrouz Derakhshan created FLINK-2621:
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             Summary: Add support for positional arguments to ParameterTool
                 Key: FLINK-2621
                 URL: https://issues.apache.org/jira/browse/FLINK-2621
             Project: Flink
          Issue Type: Sub-task
          Components: flink-contrib
            Reporter: Behrouz Derakhshan


While working on FLINK-2021, the need for positional argument support became needed, since after FLINK-2021 is merged, all training materials and guides that are pointing to old way of executing the examples will not work anymore.

What I have in mind is something like this:
{code}
// ------------------ Constructors ------------------------
        public static ParameterTool fromArgs(String[] args) {
                isPositional = true;
                // check if arg type is positional
                for(String arg:args){
                        if (arg.contains("--")){
                                isPositional = false;
                        }
                }
                if(isPositional){
                        return fromPositionalArgument(args);
                }
...
// create ParameterTool for positional arguments
public static ParameterTool fromPositionalArgument(String[] args){
                return new ParameterTool(args);
        }

...
// underlying storage for arguments
private String[] dataPositional;
        private ParameterTool(String[] args){
                this.dataPositional = args;
        }
// return the positional argument based on the given index
public String get(int position){
                if(!isPositional){
                        throw new RuntimeException("Arguments are of type of key, value");
                }
                return dataPositional[position];
        }
{code}





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