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Re: IllegalArgumentException with addVariableAttribute

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  • Subject: Re: IllegalArgumentException with addVariableAttribute
  • Date: Mon, 26 Aug 2002 12:56:31 -0600
Hi Mark:
you cant have an attribute with an array of Strings, only arrays of numbers are allowed. put it all in one string, and decode it when you read, eg 

String v = "one, two";
ncFile.addVariableAttribute("edrmap", "units", v.getBytes());

when you read, you can use java.lang.StringTokenizer to break into tokens:

     Attribute att = edrmapVar.findAttribute("units");
     String val = att.getStringValue(); 
     StringTokenizer st = new StringTokenizer(val, ", ");
     while (st.hasMoreTokens()) {
         println(st.nextToken());
     }


  /**
   * Add an attribute of type Array to the named Variable. Must be in define 
mode.
   *
* @param String varName: name of attribute. IllegalArgumentException if not valid name. 
   * @param String attName: name of attribute.
* @param Object value: must be 1D array of double, float, int, short, char, or byte 
   */
public void addVariableAttribute(String varName, String attName, Object value) ;



Mark A Ohrenschall wrote:


Hello,

I'm trying to define an array-valued variable attribute, e.g.,
ncFile.addVariableAttribute("edrmap", "units", new String [] {"one", "two"}); 

But I get a run-time error:

Exception in thread "main" java.lang.IllegalArgumentException: Invalid Type: 
class java.lang.String
        at ucar.netcdf.Attribute.<init>(Attribute.java:129)
        at 
ucar.nc2.NetcdfFileWriteable.addVariableAttribute(NetcdfFileWriteable.java:214)
        at edrmap.Edrmap.<init>(Edrmap.java:99)
        at edrmap.Edrmap.main(Edrmap.java:121)
I'm able to pass in an array of ints. The API documentation for addGlobalAttribute includes "Remark: this looks buggy; allowed types unclear." Perhaps this is true for addVariableAttribute as well? 

I'm using 2.10 beta of the (Java) netCDF library.

Thanks,

Mark Ohrenschall