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package com.google.refine.operations.cell;
import java.io.Serializable;
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.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.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.CellChange;
import com.google.refine.operations.EngineDependentMassCellOperation;
import com.google.refine.operations.OnError;
import com.google.refine.operations.OperationRegistry;
public class TextTransformOperation extends EngineDependentMassCellOperation {
final protected String _expression;
final protected OnError _onError;
final protected boolean _repeat;
final protected int _repeatCount;
static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
JSONObject engineConfig = obj.getJSONObject("engineConfig");
return new TextTransformOperation(
engineConfig,
obj.getString("columnName"),
obj.getString("expression"),
stringToOnError(obj.getString("onError")),
obj.getBoolean("repeat"),
obj.getInt("repeatCount")
);
}
static public OnError stringToOnError(String s) {
if ("set-to-blank".equalsIgnoreCase(s)) {
return OnError.SetToBlank;
} else if ("store-error".equalsIgnoreCase(s)) {
return OnError.StoreError;
} else {
return OnError.KeepOriginal;
}
}
static public String onErrorToString(OnError onError) {
if (onError == OnError.SetToBlank) {
return "set-to-blank";
} else if (onError == OnError.StoreError) {
return "store-error";
} else {
return "keep-original";
}
}
public TextTransformOperation(
JSONObject engineConfig,
String columnName,
String expression,
OnError onError,
boolean repeat,
int repeatCount
) {
super(engineConfig, columnName, true);
_expression = expression;
_onError = onError;
_repeat = repeat;
_repeatCount = repeatCount;
}
@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("columnName"); writer.value(_columnName);
writer.key("expression"); writer.value(_expression);
writer.key("onError"); writer.value(onErrorToString(_onError));
writer.key("repeat"); writer.value(_repeat);
writer.key("repeatCount"); writer.value(_repeatCount);
writer.endObject();
}
@Override
protected String getBriefDescription(Project project) {
return "Text transform on cells in column " + _columnName + " using expression " + _expression;
}
@Override
protected String createDescription(Column column,
List<CellChange> cellChanges) {
return "Text transform on " + cellChanges.size() +
" cells in column " + column.getName() + ": " + _expression;
}
@Override
protected RowVisitor createRowVisitor(Project project, List<CellChange> cellChanges, long historyEntryID) throws Exception {
Column column = project.columnModel.getColumnByName(_columnName);
Evaluable eval = MetaParser.parse(_expression);
Properties bindings = ExpressionUtils.createBindings(project);
return new RowVisitor() {
int cellIndex;
Properties bindings;
List<CellChange> cellChanges;
Evaluable eval;
public RowVisitor init(int cellIndex, Properties bindings, List<CellChange> cellChanges, Evaluable eval) {
this.cellIndex = cellIndex;
this.bindings = bindings;
this.cellChanges = cellChanges;
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;
Object oldValue = cell != null ? cell.value : null;
ExpressionUtils.bind(bindings, row, rowIndex, _columnName, cell);
Object o = eval.evaluate(bindings);
if (o == null) {
if (oldValue != null) {
CellChange cellChange = new CellChange(rowIndex, cellIndex, cell, null);
cellChanges.add(cellChange);
}
} else {
if (o instanceof Cell) {
newCell = (Cell) o;
} else if (o instanceof WrappedCell) {
newCell = ((WrappedCell) o).cell;
} else {
Serializable newValue = ExpressionUtils.wrapStorable(o);
if (ExpressionUtils.isError(newValue)) {
if (_onError == OnError.KeepOriginal) {
return false;
} else if (_onError == OnError.SetToBlank) {
newValue = null;
}
}
if (!ExpressionUtils.sameValue(oldValue, newValue)) {
newCell = new Cell(newValue, (cell != null) ? cell.recon : null);
if (_repeat) {
for (int i = 0; i < _repeatCount; i++) {
ExpressionUtils.bind(bindings, row, rowIndex, _columnName, newCell);
newValue = ExpressionUtils.wrapStorable(eval.evaluate(bindings));
if (ExpressionUtils.isError(newValue)) {
break;
} else if (ExpressionUtils.sameValue(newCell.value, newValue)) {
break;
}
newCell = new Cell(newValue, newCell.recon);
}
}
}
}
if (newCell != null) {
CellChange cellChange = new CellChange(rowIndex, cellIndex, cell, newCell);
cellChanges.add(cellChange);
}
}
return false;
}
}.init(column.getCellIndex(), bindings, cellChanges, eval);
}
}