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package com.google.refine.operations.column;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;
import com.google.refine.browsing.Engine;
import com.google.refine.browsing.FilteredRows;
import com.google.refine.browsing.RowVisitor;
import com.google.refine.expr.Evaluable;
import com.google.refine.expr.ExpressionUtils;
import com.google.refine.expr.MetaParser;
import com.google.refine.expr.WrappedCell;
import com.google.refine.history.Change;
import com.google.refine.history.HistoryEntry;
import com.google.refine.model.AbstractOperation;
import com.google.refine.model.Cell;
import com.google.refine.model.Column;
import com.google.refine.model.Project;
import com.google.refine.model.Row;
import com.google.refine.model.changes.CellAtRow;
import com.google.refine.model.changes.ColumnAdditionChange;
import com.google.refine.operations.EngineDependentOperation;
import com.google.refine.operations.OnError;
import com.google.refine.operations.OperationRegistry;
import com.google.refine.operations.cell.TextTransformOperation;
public class ColumnAdditionOperation extends EngineDependentOperation {
final protected String _baseColumnName;
final protected String _expression;
final protected OnError _onError;
final protected String _newColumnName;
final protected int _columnInsertIndex;
static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
JSONObject engineConfig = obj.getJSONObject("engineConfig");
return new ColumnAdditionOperation(
engineConfig,
obj.getString("baseColumnName"),
obj.getString("expression"),
TextTransformOperation.stringToOnError(obj.getString("onError")),
obj.getString("newColumnName"),
obj.getInt("columnInsertIndex")
);
}
public ColumnAdditionOperation(
JSONObject engineConfig,
String baseColumnName,
String expression,
OnError onError,
String newColumnName,
int columnInsertIndex
) {
super(engineConfig);
_baseColumnName = baseColumnName;
_expression = expression;
_onError = onError;
_newColumnName = newColumnName;
_columnInsertIndex = columnInsertIndex;
}
@Override
public void write(JSONWriter writer, Properties options)
throws JSONException {
writer.object();
writer.key("op"); writer.value(OperationRegistry.s_opClassToName.get(this.getClass()));
writer.key("description"); writer.value(getBriefDescription(null));
writer.key("engineConfig"); writer.value(getEngineConfig());
writer.key("newColumnName"); writer.value(_newColumnName);
writer.key("columnInsertIndex"); writer.value(_columnInsertIndex);
writer.key("baseColumnName"); writer.value(_baseColumnName);
writer.key("expression"); writer.value(_expression);
writer.key("onError"); writer.value(TextTransformOperation.onErrorToString(_onError));
writer.endObject();
}
@Override
protected String getBriefDescription(Project project) {
return "Create column " + _newColumnName +
" at index " + _columnInsertIndex +
" based on column " + _baseColumnName +
" using expression " + _expression;
}
protected String createDescription(Column column, List<CellAtRow> cellsAtRows) {
return "Create new column " + _newColumnName +
" based on column " + column.getName() +
" by filling " + cellsAtRows.size() +
" rows with " + _expression;
}
@Override
protected HistoryEntry createHistoryEntry(Project project, long historyEntryID) throws Exception {
Engine engine = createEngine(project);
Column column = project.columnModel.getColumnByName(_baseColumnName);
if (column == null) {
throw new Exception("No column named " + _baseColumnName);
}
if (project.columnModel.getColumnByName(_newColumnName) != null) {
throw new Exception("Another column already named " + _newColumnName);
}
List<CellAtRow> cellsAtRows = new ArrayList<CellAtRow>(project.rows.size());
FilteredRows filteredRows = engine.getAllFilteredRows();
filteredRows.accept(project, createRowVisitor(project, cellsAtRows));
String description = createDescription(column, cellsAtRows);
Change change = new ColumnAdditionChange(_newColumnName, _columnInsertIndex, cellsAtRows);
return new HistoryEntry(
historyEntryID, project, description, this, change);
}
protected RowVisitor createRowVisitor(Project project, List<CellAtRow> cellsAtRows) throws Exception {
Column column = project.columnModel.getColumnByName(_baseColumnName);
Evaluable eval = MetaParser.parse(_expression);
Properties bindings = ExpressionUtils.createBindings(project);
return new RowVisitor() {
int cellIndex;
Properties bindings;
List<CellAtRow> cellsAtRows;
Evaluable eval;
public RowVisitor init(int cellIndex, Properties bindings, List<CellAtRow> cellsAtRows, Evaluable eval) {
this.cellIndex = cellIndex;
this.bindings = bindings;
this.cellsAtRows = cellsAtRows;
this.eval = eval;
return this;
}
@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) {
Cell cell = row.getCell(cellIndex);
Cell newCell = null;
ExpressionUtils.bind(bindings, row, rowIndex, _baseColumnName, cell);
Object o = eval.evaluate(bindings);
if (o != null) {
if (o instanceof Cell) {
newCell = (Cell) o;
} else if (o instanceof WrappedCell) {
newCell = ((WrappedCell) o).cell;
} else {
Serializable v = ExpressionUtils.wrapStorable(o);
if (ExpressionUtils.isError(v)) {
if (_onError == OnError.SetToBlank) {
return false;
} else if (_onError == OnError.KeepOriginal) {
v = cell != null ? cell.value : null;
}
}
if (v != null) {
newCell = new Cell(v, null);
}
}
}
if (newCell != null) {
cellsAtRows.add(new CellAtRow(rowIndex, newCell));
}
return false;
}
}.init(column.getCellIndex(), bindings, cellsAtRows, eval);
}
}