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package com.google.refine.browsing.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import com.google.refine.browsing.DecoratedValue;
import com.google.refine.browsing.RecordVisitor;
import com.google.refine.browsing.RowVisitor;
import com.google.refine.browsing.facets.NominalFacetChoice;
import com.google.refine.expr.Evaluable;
import com.google.refine.expr.ExpressionUtils;
import com.google.refine.model.Cell;
import com.google.refine.model.Project;
import com.google.refine.model.Record;
import com.google.refine.model.Row;
/**
* Visit matched rows or records and group them into facet choices based on the values computed
* from a given expression.
*/
public class ExpressionNominalValueGrouper implements RowVisitor, RecordVisitor {
static public class IndexedNominalFacetChoice extends NominalFacetChoice {
int _latestIndex;
public IndexedNominalFacetChoice(DecoratedValue decoratedValue, int latestIndex) {
super(decoratedValue);
_latestIndex = latestIndex;
}
}
/*
* Configuration
*/
final protected Evaluable _evaluable;
final protected String _columnName;
final protected int _cellIndex;
/*
* Computed results
*/
final public Map<Object, IndexedNominalFacetChoice> choices = new HashMap<Object, IndexedNominalFacetChoice>();
public int blankCount = 0;
public int errorCount = 0;
/*
* Scratch pad variables
*/
protected boolean hasBlank;
protected boolean hasError;
public ExpressionNominalValueGrouper(Evaluable evaluable, String columnName, int cellIndex) {
_evaluable = evaluable;
_columnName = columnName;
_cellIndex = cellIndex;
}
@Override
public void start(Project project) {
// nothing to do
}
@Override
public void end(Project project) {
// nothing to do
}
@Override
public boolean visit(Project project, int rowIndex, Row row) {
hasError = false;
hasBlank = false;
Properties bindings = ExpressionUtils.createBindings(project);
visitRow(project, rowIndex, row, bindings, rowIndex);
if (hasError) {
errorCount++;
}
if (hasBlank) {
blankCount++;
}
return false;
}
@Override
public boolean visit(Project project, Record record) {
hasError = false;
hasBlank = false;
Properties bindings = ExpressionUtils.createBindings(project);
for (int r = record.fromRowIndex; r < record.toRowIndex; r++) {
Row row = project.rows.get(r);
visitRow(project, r, row, bindings, record.recordIndex);
}
if (hasError) {
errorCount++;
}
if (hasBlank) {
blankCount++;
}
return false;
}
protected void visitRow(Project project, int rowIndex, Row row, Properties bindings, int index) {
Object value = evalRow(project, rowIndex, row, bindings);
if (value != null) {
if (value.getClass().isArray()) {
Object[] a = (Object[]) value;
for (Object v : a) {
processValue(v, rowIndex);
}
} else if (value instanceof Collection<?>) {
for (Object v : ExpressionUtils.toObjectCollection(value)) {
processValue(v, rowIndex);
}
} else {
processValue(value, rowIndex);
}
} else {
processValue(value, rowIndex);
}
}
protected Object evalRow(Project project, int rowIndex, Row row, Properties bindings) {
Cell cell = _cellIndex < 0 ? null : row.getCell(_cellIndex);
ExpressionUtils.bind(bindings, row, rowIndex, _columnName, cell);
return _evaluable.evaluate(bindings);
}
protected void processValue(Object value, int index) {
if (ExpressionUtils.isError(value)) {
hasError = true;
} else if (ExpressionUtils.isNonBlankData(value)) {
String valueString = value.toString();
IndexedNominalFacetChoice facetChoice = choices.get(valueString);
if (facetChoice != null) {
if (facetChoice._latestIndex < index) {
facetChoice._latestIndex = index;
facetChoice.count++;
}
} else {
String label = valueString;
DecoratedValue dValue = new DecoratedValue(value, label);
IndexedNominalFacetChoice choice =
new IndexedNominalFacetChoice(dValue, index);
choice.count = 1;
choices.put(valueString, choice);
}
} else {
hasBlank = true;
}
}
public RowEvaluable getChoiceCountRowEvaluable() {
return new RowEvaluable() {
@Override
public Object eval(Project project, int rowIndex, Row row, Properties bindings) {
Object value = evalRow(project, rowIndex, row, bindings);
return getChoiceValueCountMultiple(value);
}
};
}
public Object getChoiceValueCountMultiple(Object value) {
if (value != null) {
if (value.getClass().isArray()) {
Object[] choiceValues = (Object[]) value;
List<Integer> counts = new ArrayList<Integer>(choiceValues.length);
for (Object choiceValue : choiceValues) {
counts.add(getChoiceValueCount(choiceValue));
}
return counts;
} else if (value instanceof Collection<?>) {
List<Object> choiceValues = ExpressionUtils.toObjectList(value);
List<Integer> counts = new ArrayList<Integer>(choiceValues.size());
int count = choiceValues.size();
for (int i = 0; i < count; i++) {
counts.add(getChoiceValueCount(choiceValues.get(i)));
}
return counts;
}
}
return getChoiceValueCount(value);
}
public Integer getChoiceValueCount(Object choiceValue) {
if (ExpressionUtils.isError(choiceValue)) {
return errorCount;
} else if (ExpressionUtils.isNonBlankData(choiceValue)) {
IndexedNominalFacetChoice choice = choices.get(choiceValue);
return choice != null ? choice.count : 0;
} else {
return blankCount;
}
}
}