cdm/src/main/java/ucar/nc2/NetcdfFileWriter.java
public Attribute renameGroupAttribute(Group g, String oldName, String newName) {
    if (!defineMode) throw new UnsupportedOperationException("not in define mode");

    if (!isValidObjectName(newName)) {
      String newnewName = createValidObjectName(newName);
      log.warn("illegal attribute name= " + newName + " change to " + newnewName);
      newName = newnewName;
    }

    if (g == null) g = ncfile.getRootGroup();
    Attribute att = g.findAttribute(oldName);
    if (null == att) return null;

    g.remove(att);
    att = new Attribute(newName, att.getValues());
    g.addAttribute(att);
    return att;
  }
public Attribute renameGroupAttribute(Group g, String oldName, String newName) {
    if (!defineMode) throw new UnsupportedOperationException("not in define mode");

    if (!isValidObjectName(newName)) {
      String newnewName = createValidObjectName(newName);
      log.warn("illegal attribute name= " + newName + " change to " + newnewName);
      newName = newnewName;
    }

    if (g == null) g = ncfile.getRootGroup();
    Attribute att = g.findAttribute(oldName);
    if (null == att) return null;

    g.remove(att);
    att = new Attribute(newName, att.getValues());
    g.addAttribute(att);
    return att;
  }
public Attribute renameGroupAttribute ( Group g , String oldName , String newName ) { if ( ! defineMode ) throw new UnsupportedOperationException ( "not in define mode" ) ; if ( ! isValidObjectName ( newName ) ) { String newnewName = createValidObjectName ( newName ) ; log . warn ( "illegal attribute name= " + newName + " change to " + newnewName ) ; newName = newnewName ; } if ( g == null ) g = ncfile . getRootGroup ( ) ; Attribute att = g . findAttribute ( oldName ) ; if ( null == att ) return null ; g . remove ( att ) ; att = new Attribute ( newName , att . getValues ( ) ) ; g . addAttribute ( att ) ; return att ; }
Rename a group Attribute. Must be in define mode.

@param g       the group to add to. if null, use root group
@param oldName existing Attribute has this name
@param newName rename to this
@return renamed Attribute, or null if not found
Rename a group Attribute . Must be in define mode .