java enum in matlab switch case

Question

I am currently trying to use a Java package in Matlab, which works fine so far. But now I need to do a Switch case in Matlab depending on a Java enum. Here a small example code:

Java:

package abc;

class Parser {
    enum FileType {
        UNHANDLED,
        XML,
        BINARY
    }

    public getFileType(){
        this.fileType;
    }

    private FileType fileType;

}

In Matlab, I want to do the following:

parser = abc.Parser();
Switch (parser.getFileType()) {
      case abc.FileType.BINARY:
            %TODO
      break;
}

According to using Java enums or public static fields in MATLAB, I can access the enum elements with

javaMethod('valueOf', 'abc.Parser$FileType', 'BINARY');

but if I use this line in the Switch case:

parser = abc.Parser();
Switch(Parser.getFileType()){
      case javaMethod('valueOf', 'abc.Parser$FileType', 'BINARY');
            %TODO
      break;
}

I get the error

??? SWITCH expression must be a scalar or string constant.

Has anyone a work around to achieve my desired behaviour?

WillShackleford · Accepted Answer · 2015-10-12 13:15:23Z

1

Your java doesn't compile. I changed the java to:

public class Parser {
    enum FileType {
        UNHANDLED,
        XML,
        BINARY
    }

    public FileType getFileType(){
        return this.fileType;
    }

    private FileType fileType = FileType.XML;

    public Parser(){
    }
}

For the switch I just compare the strings wrapped with char().

eg:

javaaddpath('/home/shackle/NetBeansProjects/JavaApplication50/dist/JavaApplication50.jar')
import abc.Parser

p = Parser();
switch char(p.getFileType().toString())
    case 'BINARY'
            fprintf('type is binary')
      break;

    case 'UNHANDLED'
            fprintf('type is UNHANDLED')
      break;

    case 'XML'
            fprintf('type is XML')
      break;
end

answered Oct 12, 2015 at 13:15

WillShackleford

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