cdm/src/main/java/ucar/unidata/util/Parameter.java
public String getStringValue() {
    if (valueS == null) {
      StringBuilder sbuff = new StringBuilder();
      for (double v : valueD) {
        sbuff.append(v).append(" ");
      }
      valueS = sbuff.toString();
    }
    return valueS;
  }
public String getStringValue() {
    if (valueS == null) {
      StringBuilder sbuff = new StringBuilder();
      for (double v : valueD) {
        sbuff.append(v).append(" ");
      }
      valueS = sbuff.toString();
    }
    return valueS;
  }
public String getStringValue ( ) { if ( valueS == null ) { StringBuilder sbuff = new StringBuilder ( ) ; for ( double v : valueD ) { sbuff . append ( v ) . append ( " " ) ; } valueS = sbuff . toString ( ) ; } return valueS ; }
Retrieve String value; only call if isString() is true.

@return String if this is a String valued attribute, else null.
Retrieve String value ; only call if isString () is true .