public Double asNumeric() {
return (Data.asNumeric(low) + Data.asNumeric(high)) / 2.0;
}
private double extent() {
return Data.asNumeric(high) - Data.asNumeric(low);
}
private Field[] make() {
// Assemble arrays of fields
Field[] dimensionFields = getFields(dimensions);
Field[] percentBaseFields = percentBase.toArray(new Field[percentBase.size()]);
Field[] measureFields = getFields(measures);
// The comparators to let us know when rows differ
FieldRowComparison dimComparison = new FieldRowComparison(dimensionFields, null, false);
FieldRowComparison percentBaseComparison =
new FieldRowComparison(percentBaseFields, null, false);
// group[row] gives the index of the summary group for row 'row'; 'groupCount' is the number of
// groups
int[] group = new int[rowCount];
int groupCount = buildGroups(group, dimComparison);
// These are just like the summary groups, but only for the percent bases
// The percent groups nest within each base group: rows with the same group have the same
// summary group also
// we do not create these if they are not needed, for efficiency
int[] percentGroup = percentNeeded ? new int[rowCount] : null;
int percentGroupCount = percentNeeded ? buildGroups(percentGroup, percentBaseComparison) : 0;
// Create the summary values for each group, and percentage sums
SummaryValues[] summaries = new SummaryValues[groupCount];
for (int i = 0; i < summaries.length; i++)
summaries[i] = new SummaryValues(measureFields, percentBaseFields, dimensionFields);
double[][] percentSums = new double[percentGroupCount][measureFields.length];
// Perform the Aggregation
for (int row = 0; row < rowCount; row++) {
SummaryValues value = summaries[group[row]];
if (percentNeeded) {
// If the group has not had percent sums set yet, then set it
if (value.percentSums == null) value.percentSums = percentSums[percentGroup[row]];
// Then add the values to the percentage count
for (int i = 0; i < measureFields.length; i++) {
if (measures.get(i).isPercent()) {
Double v = Data.asNumeric(measureFields[i].value(row));
if (v != null) value.percentSums[i] += v;
}
}
}
// Add the current row to that group, with the relevant 'sums' for percentages
value.rows.add(row);
}
Object[][] dimData = new Object[dimensions.size()][groupCount];
Object[][] measureData = new Object[measures.size()][groupCount];
for (int g = 0; g < groupCount; g++) {
SummaryValues values = summaries[g];
int originalRow = values.firstRow();
// Set the dimension values
for (int i = 0; i < dimensions.size(); i++)
dimData[i][g] = dimensionFields[i].value(originalRow);
// Set the measure values
for (int i = 0; i < measures.size(); i++) {
MeasureField m = measures.get(i);
measureData[i][g] = values.get(i, m);
}
}
// Assemble fields
Field[] fields = new Field[dimData.length + measureData.length];
for (int i = 0; i < dimData.length; i++) {
DimensionField f = dimensions.get(i);
fields[i] = Fields.makeColumnField(f.rename, f.label(), dimData[i]);
Fields.copyBaseProperties(f.field, fields[i]);
}
for (int i = 0; i < measureData.length; i++) {
MeasureField m = measures.get(i);
Field result = Fields.makeColumnField(m.rename, m.label(), measureData[i]);
setProperties(m.method, result, m.field);
result.set("summary", m.method);
result.set("calculated", true);
if (m.field != null) result.set("originalLabel", m.field.label);
fields[dimData.length + i] = result;
}
return fields;
}