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package com.google.refine.operations.cell;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
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.MassRowColumnChange;
import com.google.refine.operations.OperationRegistry;
import com.google.refine.util.JSONUtilities;
public class KeyValueColumnizeOperation extends AbstractOperation {
final protected String _keyColumnName;
final protected String _valueColumnName;
final protected String _noteColumnName;
static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
return new KeyValueColumnizeOperation(
obj.getString("keyColumnName"),
obj.getString("valueColumnName"),
JSONUtilities.getString(obj, "noteColumnName", null)
);
}
public KeyValueColumnizeOperation(
String keyColumnName,
String valueColumnName,
String noteColumnName
) {
_keyColumnName = keyColumnName;
_valueColumnName = valueColumnName;
_noteColumnName = noteColumnName;
}
@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(
"Columnize by key column " +
_keyColumnName + " and value column " + _valueColumnName +
(_noteColumnName != null ? (" with note column " + _noteColumnName) : ""));
writer.key("keyColumnName"); writer.value(_keyColumnName);
writer.key("valueColumnName"); writer.value(_valueColumnName);
writer.key("noteColumnName"); writer.value(_noteColumnName);
writer.endObject();
}
@Override
protected String getBriefDescription(Project project) {
return "Columnize by key column " +
_keyColumnName + " and value column " + _valueColumnName +
(_noteColumnName != null ? (" with note column " + _noteColumnName) : "");
}
@Override
protected HistoryEntry createHistoryEntry(Project project, long historyEntryID) throws Exception {
int keyColumnIndex = project.columnModel.getColumnIndexByName(_keyColumnName);
int valueColumnIndex = project.columnModel.getColumnIndexByName(_valueColumnName);
int noteColumnIndex = _noteColumnName == null ? -1 :
project.columnModel.getColumnIndexByName(_noteColumnName);
Column keyColumn = project.columnModel.getColumnByName(_keyColumnName);
Column valueColumn = project.columnModel.getColumnByName(_valueColumnName);
Column noteColumn = _noteColumnName == null ? null :
project.columnModel.getColumnByName(_noteColumnName);
List<Column> unchangedColumns = new ArrayList<Column>();
List<Column> oldColumns = project.columnModel.columns;
for (int i = 0; i < oldColumns.size(); i++) {
if (i != keyColumnIndex &&
i != valueColumnIndex &&
i != noteColumnIndex) {
unchangedColumns.add(oldColumns.get(i));
}
}
List<Column> newColumns = new ArrayList<Column>();
List<Column> newNoteColumns = new ArrayList<Column>();
Map<String, Column> keyValueToColumn = new HashMap<String, Column>();
Map<String, Column> keyValueToNoteColumn = new HashMap<String, Column>();
Map<String, Row> groupByCellValuesToRow = new HashMap<String, Row>();
List<Row> newRows = new ArrayList<Row>();
List<Row> oldRows = project.rows;
Row reusableRow = null;
List<Row> currentRows = new ArrayList<Row>();
String recordKey = null; // key which indicates the start of a record
if (unchangedColumns.isEmpty()) {
reusableRow = new Row(1);
newRows.add(reusableRow);
currentRows.clear();
currentRows.add(reusableRow);
}
for (int r = 0; r < oldRows.size(); r++) {
Row oldRow = oldRows.get(r);
Object key = oldRow.getCellValue(keyColumn.getCellIndex());
if (!ExpressionUtils.isNonBlankData(key)) {
if (unchangedColumns.isEmpty()) {
// For degenerate 2 column case (plus optional note column),
// start a new row when we hit a blank line
reusableRow = new Row(newColumns.size());
newRows.add(reusableRow);
currentRows.clear();
currentRows.add(reusableRow);
} else {
// Copy rows with no key
newRows.add(buildNewRow(unchangedColumns, oldRow, unchangedColumns.size()));
}
continue;
}
String keyString = key.toString();
// Start a new row on our beginning of record key
// TODO: Add support for processing in record mode instead of just by rows
if (keyString.equals(recordKey) || recordKey == null) {
reusableRow = new Row(newColumns.size());
newRows.add(reusableRow);
currentRows.clear();
currentRows.add(reusableRow);
}
Column newColumn = keyValueToColumn.get(keyString);
if (newColumn == null) {
// Allocate new column
newColumn = new Column(
project.columnModel.allocateNewCellIndex(),
project.columnModel.getUnduplicatedColumnName(keyString));
keyValueToColumn.put(keyString, newColumn);
newColumns.add(newColumn);
// We assume first key encountered is the beginning of record key
// TODO: make customizable?
if (recordKey == null) {
recordKey = keyString;
}
}
/*
* NOTE: If we have additional columns, we currently merge all rows that
* have identical values in those columns and then add our new columns.
*/
if (unchangedColumns.size() > 0) {
StringBuffer sb = new StringBuffer();
for (int c = 0; c < unchangedColumns.size(); c++) {
Column unchangedColumn = unchangedColumns.get(c);
Object cellValue = oldRow.getCellValue(unchangedColumn.getCellIndex());
if (c > 0) {
sb.append('\0');
}
if (cellValue != null) {
sb.append(cellValue.toString());
}
}
String unchangedCellValues = sb.toString();
reusableRow = groupByCellValuesToRow.get(unchangedCellValues);
if (reusableRow == null ||
reusableRow.getCellValue(valueColumn.getCellIndex()) != null) {
reusableRow = buildNewRow(unchangedColumns, oldRow, newColumn.getCellIndex() + 1);
groupByCellValuesToRow.put(unchangedCellValues, reusableRow);
newRows.add(reusableRow);
}
}
Cell cell = oldRow.getCell(valueColumn.getCellIndex());
if (unchangedColumns.size() == 0) {
int index = newColumn.getCellIndex();
Row row = getAvailableRow(currentRows, newRows, index);
row.setCell(index, cell);
} else {
// TODO: support repeating keys in this mode too
reusableRow.setCell(newColumn.getCellIndex(), cell);
}
if (noteColumn != null) {
Object noteValue = oldRow.getCellValue(noteColumn.getCellIndex());
if (ExpressionUtils.isNonBlankData(noteValue)) {
Column newNoteColumn = keyValueToNoteColumn.get(keyString);
if (newNoteColumn == null) {
// Allocate new column
newNoteColumn = new Column(
project.columnModel.allocateNewCellIndex(),
project.columnModel.getUnduplicatedColumnName(
noteColumn.getName() + " : " + keyString));
keyValueToNoteColumn.put(keyString, newNoteColumn);
newNoteColumns.add(newNoteColumn);
}
int newNoteCellIndex = newNoteColumn.getCellIndex();
Object existingNewNoteValue = reusableRow.getCellValue(newNoteCellIndex);
if (ExpressionUtils.isNonBlankData(existingNewNoteValue)) {
Cell concatenatedNoteCell = new Cell(
existingNewNoteValue.toString() + ";" + noteValue.toString(), null);
reusableRow.setCell(newNoteCellIndex, concatenatedNoteCell);
} else {
reusableRow.setCell(newNoteCellIndex, oldRow.getCell(noteColumn.getCellIndex()));
}
}
}
}
List<Column> allColumns = new ArrayList<Column>(unchangedColumns);
allColumns.addAll(newColumns);
allColumns.addAll(newNoteColumns);
// clean up the empty rows
for (int i = newRows.size() - 1;i>=0;i--) {
if (newRows.get(i).isEmpty())
newRows.remove(i);
}
return new HistoryEntry(
historyEntryID,
project,
getBriefDescription(null),
this,
new MassRowColumnChange(allColumns, newRows)
);
}
private Row getAvailableRow(List<Row> currentRows, List<Row> newRows, int index) {
for (Row row : currentRows) {
if (row.getCell(index) == null) {
return row;
}
}
// If we couldn't find a row with an empty spot, we'll need a new row
Row row = new Row(index);
newRows.add(row);
currentRows.add(row);
return row;
}
private Row buildNewRow(List<Column> unchangedColumns, Row oldRow, int size) {
Row reusableRow = new Row(size);
for (int c = 0; c < unchangedColumns.size(); c++) {
Column unchangedColumn = unchangedColumns.get(c);
int cellIndex = unchangedColumn.getCellIndex();
reusableRow.setCell(cellIndex, oldRow.getCell(cellIndex));
}
return reusableRow;
}
}