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package com.google.refine.model.changes;
import java.io.IOException;
import java.io.LineNumberReader;
import java.io.Writer;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Properties;
import com.google.refine.history.Change;
import com.google.refine.model.Cell;
import com.google.refine.model.Column;
import com.google.refine.model.ColumnGroup;
import com.google.refine.model.Project;
import com.google.refine.model.Row;
import com.google.refine.util.Pool;
public class ColumnRemovalChange extends ColumnChange {
final protected int _oldColumnIndex;
protected Column _oldColumn;
protected CellAtRow[] _oldCells;
protected List<ColumnGroup> _oldColumnGroups;
public ColumnRemovalChange(int index) {
_oldColumnIndex = index;
}
@Override
public void apply(Project project) {
synchronized (project) {
int columnGroupCount = project.columnModel.columnGroups.size();
_oldColumnGroups = new ArrayList<ColumnGroup>(columnGroupCount);
for (int i = columnGroupCount - 1; i >= 0; i--) {
ColumnGroup columnGroup = project.columnModel.columnGroups.get(i);
_oldColumnGroups.add(columnGroup);
if (columnGroup.startColumnIndex <= _oldColumnIndex) {
if (columnGroup.startColumnIndex + columnGroup.columnSpan > _oldColumnIndex) {
// the group starts before or at _oldColumnIndex
// but spans to include _oldColumnIndex
if (columnGroup.keyColumnIndex == _oldColumnIndex) {
// the key column is removed, so we remove the whole group
project.columnModel.columnGroups.remove(i);
} else {
// otherwise, the group's span has been reduced by 1
project.columnModel.columnGroups.set(i, new ColumnGroup(
columnGroup.startColumnIndex,
columnGroup.columnSpan - 1,
columnGroup.keyColumnIndex < _oldColumnIndex ?
columnGroup.keyColumnIndex :
(columnGroup.keyColumnIndex - 1)
));
}
}
} else {
// the column removed precedes this whole group
project.columnModel.columnGroups.set(i, new ColumnGroup(
columnGroup.startColumnIndex - 1,
columnGroup.columnSpan,
columnGroup.keyColumnIndex - 1
));
}
}
_oldColumn = project.columnModel.columns.remove(_oldColumnIndex);
_oldCells = new CellAtRow[project.rows.size()];
int cellIndex = _oldColumn.getCellIndex();
for (int i = 0; i < _oldCells.length; i++) {
Row row = project.rows.get(i);
Cell oldCell = null;
if (cellIndex < row.cells.size()) {
oldCell = row.cells.get(cellIndex);
}
_oldCells[i] = new CellAtRow(i, oldCell);
row.setCell(cellIndex, null);
}
project.update();
}
}
@Override
public void revert(Project project) {
synchronized (project) {
project.columnModel.columns.add(_oldColumnIndex, _oldColumn);
int cellIndex = _oldColumn.getCellIndex();
for (CellAtRow cell : _oldCells) {
project.rows.get(cell.row).cells.set(cellIndex, cell.cell);
}
project.columnModel.columnGroups.clear();
project.columnModel.columnGroups.addAll(_oldColumnGroups);
project.update();
}
}
@Override
public void save(Writer writer, Properties options) throws IOException {
writer.write("oldColumnIndex="); writer.write(Integer.toString(_oldColumnIndex)); writer.write('\n');
writer.write("oldColumn="); _oldColumn.save(writer); writer.write('\n');
writer.write("oldCellCount="); writer.write(Integer.toString(_oldCells.length)); writer.write('\n');
for (CellAtRow c : _oldCells) {
c.save(writer, options);
writer.write('\n');
}
writeOldColumnGroups(writer, options, _oldColumnGroups);
writer.write("/ec/\n"); // end of change marker
}
static public Change load(LineNumberReader reader, Pool pool) throws Exception {
int oldColumnIndex = -1;
Column oldColumn = null;
CellAtRow[] oldCells = null;
List<ColumnGroup> oldColumnGroups = null;
String line;
while ((line = reader.readLine()) != null && !"/ec/".equals(line)) {
int equal = line.indexOf('=');
CharSequence field = line.subSequence(0, equal);
if ("oldColumnIndex".equals(field)) {
oldColumnIndex = Integer.parseInt(line.substring(equal + 1));
} else if ("oldColumn".equals(field)) {
oldColumn = Column.load(line.substring(equal + 1));
} else if ("oldCellCount".equals(field)) {
int oldCellCount = Integer.parseInt(line.substring(equal + 1));
oldCells = new CellAtRow[oldCellCount];
for (int i = 0; i < oldCellCount; i++) {
line = reader.readLine();
if (line != null) {
oldCells[i] = CellAtRow.load(line, pool);
}
}
} else if ("oldColumnGroupCount".equals(field)) {
int oldColumnGroupCount = Integer.parseInt(line.substring(equal + 1));
oldColumnGroups = readOldColumnGroups(reader, oldColumnGroupCount);
}
}
ColumnRemovalChange change = new ColumnRemovalChange(oldColumnIndex);
change._oldColumn = oldColumn;
change._oldCells = oldCells;
change._oldColumnGroups = oldColumnGroups != null ?
oldColumnGroups : new LinkedList<ColumnGroup>();
return change;
}
}