long computeFieldSize(BaseType bt, boolean isAscii) throws Exception {
long fieldsize = 0;
// Figure out what this field is (e.g. primitive or not)
// Somewhat convoluted.
if (bt instanceof DConstructor) {
// simple struct, seq, or grid => recurse
fieldsize = computeSize((DConstructor) bt, isAscii);
} else if (bt instanceof DArray) {
SDArray da = (SDArray) bt;
// Separate structure arrays from primitive arrays
if (da.getContainerVar() instanceof DPrimitive) {
fieldsize = computeArraySize(da);
} else if (da.getContainerVar() instanceof DStructure) {
fieldsize = computeSize((DStructure) da.getContainerVar(), isAscii); // recurse
} else { // Some kind of problem
throw new NoSuchTypeException("Computesize: unexpected type for " + bt.getLongName());
}
} else if (bt instanceof DPrimitive) {
DPrimitive dp = (DPrimitive) bt;
if (dp instanceof DString) {
String v = ((DString) dp).getValue();
fieldsize = (v == null ? 0 : v.length());
} else {
DataType dtype = DODSNetcdfFile.convertToNCType(bt);
fieldsize = dtype.getSize();
}
} else { // Some kind of problem
throw new NoSuchTypeException("Computesize: unknown type for " + bt.getLongName());
}
return fieldsize;
}
// Recursively compute size of the dds to be returned
private long computeSize(DConstructor ctor, boolean isAscii) throws Exception {
long projectsize = 0; // accumulate size of projected variables
long othersize = 0; // accumulate size of non-projected variables
long fieldsize = 0;
int projectedcount = 0;
int fieldcount = 0;
Enumeration vars = ctor.getVariables();
while (vars.hasMoreElements()) {
fieldcount++;
BaseType field = (BaseType) vars.nextElement();
fieldsize = computeFieldSize(field, isAscii);
// accumulate the field sizes
if (field.isProject()) {
projectsize += fieldsize;
projectedcount++;
} else {
othersize += fieldsize;
}
}
// Cases to consider:
// 1. If all of the fields of this ctor are projected,
// then return projectsize
// 2. If none of the fields of this ctor are projected,
// then return othersize
// 3. otherwise, at least one field, but not all, is projected,
// => return projectsize;
if (projectedcount == fieldcount) return projectsize;
else if (projectedcount == 0) return othersize;
else {
assert (projectedcount > 0 && projectedcount < fieldcount);
return projectsize;
}
}