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package com.google.refine.operations.cell;
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.expr.ExpressionUtils;
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 MultiValuedCellJoinOperation extends AbstractOperation {
final protected String _columnName;
final protected String _keyColumnName;
final protected String _separator;
static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
return new MultiValuedCellJoinOperation(
obj.getString("columnName"),
obj.getString("keyColumnName"),
obj.getString("separator")
);
}
public MultiValuedCellJoinOperation(
String columnName,
String keyColumnName,
String separator
) {
_columnName = columnName;
_keyColumnName = keyColumnName;
_separator = separator;
}
@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("columnName"); writer.value(_columnName);
writer.key("keyColumnName"); writer.value(_keyColumnName);
writer.key("separator"); writer.value(_separator);
writer.endObject();
}
@Override
protected String getBriefDescription(Project project) {
return "Join 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(keyCellIndex)) {
newRows.add(oldRow.dup());
continue;
}
int r2 = r + 1;
while (r2 < oldRowCount && project.rows.get(r2).isCellBlank(keyCellIndex)) {
r2++;
}
if (r2 == r + 1) {
newRows.add(oldRow.dup());
continue;
}
StringBuffer sb = new StringBuffer();
for (int r3 = r; r3 < r2; r3++) {
Object value = project.rows.get(r3).getCellValue(cellIndex);
if (ExpressionUtils.isNonBlankData(value)) {
if (sb.length() > 0) {
sb.append(_separator);
}
sb.append(value.toString());
}
}
for (int r3 = r; r3 < r2; r3++) {
Row newRow = project.rows.get(r3).dup();
if (r3 == r) {
newRow.setCell(cellIndex, new Cell(sb.toString(), null));
} else {
newRow.setCell(cellIndex, null);
}
if (!newRow.isEmpty()) {
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)
);
}
}