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package com.google.refine.browsing.facets;
import java.util.LinkedList;
import java.util.List;
import java.util.Properties;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;
import com.google.refine.ProjectManager;
import com.google.refine.browsing.DecoratedValue;
import com.google.refine.browsing.FilteredRecords;
import com.google.refine.browsing.FilteredRows;
import com.google.refine.browsing.RecordFilter;
import com.google.refine.browsing.RowFilter;
import com.google.refine.browsing.filters.AllRowsRecordFilter;
import com.google.refine.browsing.filters.AnyRowRecordFilter;
import com.google.refine.browsing.filters.ExpressionEqualRowFilter;
import com.google.refine.browsing.util.ExpressionNominalValueGrouper;
import com.google.refine.expr.Evaluable;
import com.google.refine.expr.MetaParser;
import com.google.refine.expr.ParsingException;
import com.google.refine.model.Column;
import com.google.refine.model.Project;
import com.google.refine.util.JSONUtilities;
public class ListFacet implements Facet {
/*
* Configuration
*/
protected String _name;
protected String _expression;
protected String _columnName;
protected boolean _invert;
// If true, then facet won't show the blank and error choices
protected boolean _omitBlank;
protected boolean _omitError;
protected List<NominalFacetChoice> _selection = new LinkedList<NominalFacetChoice>();
protected boolean _selectBlank;
protected boolean _selectError;
/*
* Derived configuration
*/
protected int _cellIndex;
protected Evaluable _eval;
protected String _errorMessage;
/*
* Computed results
*/
protected List<NominalFacetChoice> _choices = new LinkedList<NominalFacetChoice>();
protected int _blankCount;
protected int _errorCount;
public ListFacet() {
}
@Override
public void write(JSONWriter writer, Properties options)
throws JSONException {
writer.object();
writer.key("name"); writer.value(_name);
writer.key("expression"); writer.value(_expression);
writer.key("columnName"); writer.value(_columnName);
writer.key("invert"); writer.value(_invert);
if (_errorMessage != null) {
writer.key("error"); writer.value(_errorMessage);
} else if (_choices.size() > getLimit()) {
writer.key("error"); writer.value("Too many choices");
writer.key("choiceCount"); writer.value(_choices.size());
} else {
writer.key("choices"); writer.array();
for (NominalFacetChoice choice : _choices) {
choice.write(writer, options);
}
writer.endArray();
if (!_omitBlank && (_selectBlank || _blankCount > 0)) {
writer.key("blankChoice");
writer.object();
writer.key("s"); writer.value(_selectBlank);
writer.key("c"); writer.value(_blankCount);
writer.endObject();
}
if (!_omitError && (_selectError || _errorCount > 0)) {
writer.key("errorChoice");
writer.object();
writer.key("s"); writer.value(_selectError);
writer.key("c"); writer.value(_errorCount);
writer.endObject();
}
}
writer.endObject();
}
protected int getLimit() {
Object v = ProjectManager.singleton.getPreferenceStore().get("ui.browsing.listFacet.limit");
if (v != null) {
if (v instanceof Number) {
return ((Number) v).intValue();
} else {
try {
int n = Integer.parseInt(v.toString());
return n;
} catch (NumberFormatException e) {
// ignore
}
}
}
return 2000;
}
@Override
public void initializeFromJSON(Project project, JSONObject o) throws JSONException {
_name = o.getString("name");
_expression = o.getString("expression");
_columnName = o.getString("columnName");
_invert = o.has("invert") && o.getBoolean("invert");
if (_columnName.length() > 0) {
Column column = project.columnModel.getColumnByName(_columnName);
if (column != null) {
_cellIndex = column.getCellIndex();
} else {
_errorMessage = "No column named " + _columnName;
}
} else {
_cellIndex = -1;
}
try {
_eval = MetaParser.parse(_expression);
} catch (ParsingException e) {
_errorMessage = e.getMessage();
}
_selection.clear();
JSONArray a = o.getJSONArray("selection");
int length = a.length();
for (int i = 0; i < length; i++) {
JSONObject oc = a.getJSONObject(i);
JSONObject ocv = oc.getJSONObject("v");
DecoratedValue decoratedValue = new DecoratedValue(
ocv.get("v"), ocv.getString("l"));
NominalFacetChoice nominalFacetChoice = new NominalFacetChoice(decoratedValue);
nominalFacetChoice.selected = true;
_selection.add(nominalFacetChoice);
}
_omitBlank = JSONUtilities.getBoolean(o, "omitBlank", false);
_omitError = JSONUtilities.getBoolean(o, "omitError", false);
_selectBlank = JSONUtilities.getBoolean(o, "selectBlank", false);
_selectError = JSONUtilities.getBoolean(o, "selectError", false);
}
@Override
public RowFilter getRowFilter(Project project) {
return
_eval == null ||
_errorMessage != null ||
(_selection.size() == 0 && !_selectBlank && !_selectError) ?
null :
new ExpressionEqualRowFilter(
_eval,
_columnName,
_cellIndex,
createMatches(),
_selectBlank,
_selectError,
_invert);
}
@Override
public RecordFilter getRecordFilter(Project project) {
RowFilter rowFilter = getRowFilter(project);
return rowFilter == null ? null :
(_invert ?
new AllRowsRecordFilter(rowFilter) :
new AnyRowRecordFilter(rowFilter));
}
@Override
public void computeChoices(Project project, FilteredRows filteredRows) {
if (_eval != null && _errorMessage == null) {
ExpressionNominalValueGrouper grouper =
new ExpressionNominalValueGrouper(_eval, _columnName, _cellIndex);
filteredRows.accept(project, grouper);
postProcessGrouper(grouper);
}
}
@Override
public void computeChoices(Project project, FilteredRecords filteredRecords) {
if (_eval != null && _errorMessage == null) {
ExpressionNominalValueGrouper grouper =
new ExpressionNominalValueGrouper(_eval, _columnName, _cellIndex);
filteredRecords.accept(project, grouper);
postProcessGrouper(grouper);
}
}
protected void postProcessGrouper(ExpressionNominalValueGrouper grouper) {
_choices.clear();
_choices.addAll(grouper.choices.values());
for (NominalFacetChoice choice : _selection) {
String valueString = choice.decoratedValue.value.toString();
if (grouper.choices.containsKey(valueString)) {
grouper.choices.get(valueString).selected = true;
} else {
/*
* A selected choice can have zero count if it is selected together
* with other choices, and some other facets' constraints eliminate
* all rows projected to this choice altogether. For example, if you
* select both "car" and "bicycle" in the "type of vehicle" facet, and
* then constrain the "wheels" facet to more than 2, then the "bicycle"
* choice now has zero count even if it's still selected. The grouper
* won't be able to detect the "bicycle" choice, so we need to inject
* that choice into the choice list ourselves.
*/
choice.count = 0;
_choices.add(choice);
}
}
_blankCount = grouper.blankCount;
_errorCount = grouper.errorCount;
}
protected Object[] createMatches() {
Object[] a = new Object[_selection.size()];
for (int i = 0; i < a.length; i++) {
a[i] = _selection.get(i).decoratedValue.value;
}
return a;
}
}