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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.Column;
import com.google.refine.model.ColumnGroup;
import com.google.refine.model.Project;
import com.google.refine.util.Pool;
public class ColumnReorderChange extends ColumnChange {
final protected List<String> _columnNames;
protected List<Column> _oldColumns;
protected List<Column> _newColumns;
protected List<ColumnGroup> _oldColumnGroups;
public ColumnReorderChange(List<String> columnNames) {
_columnNames = columnNames;
}
@Override
public void apply(Project project) {
synchronized (project) {
if (_newColumns == null) {
_newColumns = new ArrayList<Column>();
_oldColumns = new ArrayList<Column>(project.columnModel.columns);
for (String n : _columnNames) {
Column column = project.columnModel.getColumnByName(n);
if (column != null) {
_newColumns.add(column);
}
}
_oldColumnGroups = new ArrayList<ColumnGroup>(project.columnModel.columnGroups);
}
project.columnModel.columns.clear();
project.columnModel.columns.addAll(_newColumns);
project.columnModel.columnGroups.clear();
project.update();
}
}
@Override
public void revert(Project project) {
synchronized (project) {
project.columnModel.columns.clear();
project.columnModel.columns.addAll(_oldColumns);
project.columnModel.columnGroups.clear();
project.columnModel.columnGroups.addAll(_oldColumnGroups);
project.update();
}
}
@Override
public void save(Writer writer, Properties options) throws IOException {
writer.write("columnNameCount="); writer.write(Integer.toString(_columnNames.size())); writer.write('\n');
for (String n : _columnNames) {
writer.write(n);
writer.write('\n');
}
writer.write("oldColumnCount="); writer.write(Integer.toString(_oldColumns.size())); writer.write('\n');
for (Column c : _oldColumns) {
c.save(writer);
writer.write('\n');
}
writer.write("newColumnCount="); writer.write(Integer.toString(_newColumns.size())); writer.write('\n');
for (Column c : _newColumns) {
c.save(writer);
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 {
List<String> columnNames = new ArrayList<String>();
List<Column> oldColumns = new ArrayList<Column>();
List<Column> newColumns = new ArrayList<Column>();
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 ("columnNameCount".equals(field)) {
int count = Integer.parseInt(line.substring(equal + 1));
for (int i = 0; i < count; i++) {
line = reader.readLine();
if (line != null) {
columnNames.add(line);
}
}
} else if ("oldColumnCount".equals(field)) {
int count = Integer.parseInt(line.substring(equal + 1));
for (int i = 0; i < count; i++) {
line = reader.readLine();
if (line != null) {
oldColumns.add(Column.load(line));
}
}
} else if ("newColumnCount".equals(field)) {
int count = Integer.parseInt(line.substring(equal + 1));
for (int i = 0; i < count; i++) {
line = reader.readLine();
if (line != null) {
newColumns.add(Column.load(line));
}
}
} else if ("oldColumnGroupCount".equals(field)) {
int oldColumnGroupCount = Integer.parseInt(line.substring(equal + 1));
oldColumnGroups = readOldColumnGroups(reader, oldColumnGroupCount);
}
}
ColumnReorderChange change = new ColumnReorderChange(columnNames);
change._oldColumns = oldColumns;
change._newColumns = newColumns;
change._oldColumnGroups = oldColumnGroups != null ?
oldColumnGroups : new LinkedList<ColumnGroup>();
return change;
}
}