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package com.google.refine.operations.cell;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import org.apache.commons.lang.StringUtils;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;
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.MassRowChange;
import com.google.refine.operations.OperationRegistry;
public class MultiValuedCellSplitOperation extends AbstractOperation {
final protected String _columnName;
final protected String _keyColumnName;
final protected String _separator;
final protected String _mode;
static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
return new MultiValuedCellSplitOperation(
obj.getString("columnName"),
obj.getString("keyColumnName"),
obj.getString("separator"),
obj.getString("mode")
);
}
public MultiValuedCellSplitOperation(
String columnName,
String keyColumnName,
String separator,
String mode
) {
_columnName = columnName;
_keyColumnName = keyColumnName;
_separator = separator;
_mode = mode;
}
@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("Split multi-valued cells in column " + _columnName);
writer.key("columnName"); writer.value(_columnName);
writer.key("keyColumnName"); writer.value(_keyColumnName);
writer.key("separator"); writer.value(_separator);
writer.key("mode"); writer.value(_mode);
writer.endObject();
}
@Override
protected String getBriefDescription(Project project) {
return "Split multi-valued cells in column " + _columnName;
}
@Override
protected HistoryEntry createHistoryEntry(Project project, long historyEntryID) throws Exception {
Column column = project.columnModel.getColumnByName(_columnName);
if (column == null) {
throw new Exception("No column named " + _columnName);
}
int cellIndex = column.getCellIndex();
Column keyColumn = project.columnModel.getColumnByName(_keyColumnName);
if (keyColumn == null) {
throw new Exception("No key column named " + _keyColumnName);
}
int keyCellIndex = keyColumn.getCellIndex();
List<Row> newRows = new ArrayList<Row>();
int oldRowCount = project.rows.size();
for (int r = 0; r < oldRowCount; r++) {
Row oldRow = project.rows.get(r);
if (oldRow.isCellBlank(cellIndex)) {
newRows.add(oldRow.dup());
continue;
}
Object value = oldRow.getCellValue(cellIndex);
String s = value instanceof String ? ((String) value) : value.toString();
String[] values = null;
if (_mode.equals("regex")) {
values = s.split(_separator);
} else {
values = StringUtils.splitByWholeSeparatorPreserveAllTokens(s, _separator);
}
if (values.length < 2) {
newRows.add(oldRow.dup());
continue;
}
// First value goes into the same row
{
Row firstNewRow = oldRow.dup();
firstNewRow.setCell(cellIndex, new Cell(values[0].trim(), null));
newRows.add(firstNewRow);
}
int r2 = r + 1;
for (int v = 1; v < values.length; v++) {
Cell newCell = new Cell(values[v].trim(), null);
if (r2 < project.rows.size()) {
Row oldRow2 = project.rows.get(r2);
if (oldRow2.isCellBlank(cellIndex) &&
oldRow2.isCellBlank(keyCellIndex)) {
Row newRow = oldRow2.dup();
newRow.setCell(cellIndex, newCell);
newRows.add(newRow);
r2++;
continue;
}
}
Row newRow = new Row(cellIndex + 1);
newRow.setCell(cellIndex, newCell);
newRows.add(newRow);
}
r = r2 - 1; // r will be incremented by the for loop anyway
}
return new HistoryEntry(
historyEntryID,
project,
getBriefDescription(null),
this,
new MassRowChange(newRows)
);
}
}