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package com.google.refine.operations.column;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.regex.Pattern;
import org.apache.commons.lang.StringUtils;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;
import com.google.refine.browsing.Engine;
import com.google.refine.browsing.FilteredRows;
import com.google.refine.browsing.RowVisitor;
import com.google.refine.expr.ExpressionUtils;
import com.google.refine.history.Change;
import com.google.refine.history.HistoryEntry;
import com.google.refine.importers.ImporterUtilities;
import com.google.refine.model.AbstractOperation;
import com.google.refine.model.Column;
import com.google.refine.model.Project;
import com.google.refine.model.Row;
import com.google.refine.model.changes.ColumnSplitChange;
import com.google.refine.operations.EngineDependentOperation;
import com.google.refine.operations.OperationRegistry;
import com.google.refine.util.JSONUtilities;
public class ColumnSplitOperation extends EngineDependentOperation {
final protected String _columnName;
final protected boolean _guessCellType;
final protected boolean _removeOriginalColumn;
final protected String _mode;
final protected String _separator;
final protected boolean _regex;
final protected int _maxColumns;
final protected int[] _fieldLengths;
static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
JSONObject engineConfig = obj.getJSONObject("engineConfig");
String mode = obj.getString("mode");
if ("separator".equals(mode)) {
return new ColumnSplitOperation(
engineConfig,
obj.getString("columnName"),
obj.getBoolean("guessCellType"),
obj.getBoolean("removeOriginalColumn"),
obj.getString("separator"),
obj.getBoolean("regex"),
obj.getInt("maxColumns")
);
} else {
return new ColumnSplitOperation(
engineConfig,
obj.getString("columnName"),
obj.getBoolean("guessCellType"),
obj.getBoolean("removeOriginalColumn"),
JSONUtilities.getIntArray(obj, "fieldLengths")
);
}
}
public ColumnSplitOperation(
JSONObject engineConfig,
String columnName,
boolean guessCellType,
boolean removeOriginalColumn,
String separator,
boolean regex,
int maxColumns
) {
super(engineConfig);
_columnName = columnName;
_guessCellType = guessCellType;
_removeOriginalColumn = removeOriginalColumn;
_mode = "separator";
_separator = separator;
_regex = regex;
_maxColumns = maxColumns;
_fieldLengths = null;
}
public ColumnSplitOperation(
JSONObject engineConfig,
String columnName,
boolean guessCellType,
boolean removeOriginalColumn,
int[] fieldLengths
) {
super(engineConfig);
_columnName = columnName;
_guessCellType = guessCellType;
_removeOriginalColumn = removeOriginalColumn;
_mode = "lengths";
_separator = null;
_regex = false;
_maxColumns = -1;
_fieldLengths = fieldLengths;
}
@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("engineConfig"); writer.value(getEngineConfig());
writer.key("columnName"); writer.value(_columnName);
writer.key("guessCellType"); writer.value(_guessCellType);
writer.key("removeOriginalColumn"); writer.value(_removeOriginalColumn);
writer.key("mode"); writer.value(_mode);
if ("separator".equals(_mode)) {
writer.key("separator"); writer.value(_separator);
writer.key("regex"); writer.value(_regex);
writer.key("maxColumns"); writer.value(_maxColumns);
} else {
writer.key("fieldLengths"); writer.array();
for (int l : _fieldLengths) {
writer.value(l);
}
writer.endArray();
}
writer.endObject();
}
@Override
protected String getBriefDescription(Project project) {
return "Split column " + _columnName +
("separator".equals(_mode) ? " by separator" : " by field lengths");
}
@Override
protected HistoryEntry createHistoryEntry(Project project, long historyEntryID) throws Exception {
Engine engine = createEngine(project);
Column column = project.columnModel.getColumnByName(_columnName);
if (column == null) {
throw new Exception("No column named " + _columnName);
}
List<String> columnNames = new ArrayList<String>();
List<Integer> rowIndices = new ArrayList<Integer>(project.rows.size());
List<List<Serializable>> tuples = new ArrayList<List<Serializable>>(project.rows.size());
FilteredRows filteredRows = engine.getAllFilteredRows();
RowVisitor rowVisitor;
if ("lengths".equals(_mode)) {
rowVisitor = new ColumnSplitRowVisitor(column.getCellIndex(), columnNames, rowIndices, tuples) {
@Override
protected java.util.List<Serializable> split(String s) {
List<Serializable> results = new ArrayList<Serializable>(_fieldLengths.length + 1);
int lastIndex = 0;
for (int length : _fieldLengths) {
int from = lastIndex;
int to = Math.min(from + length, s.length());
results.add(stringToValue(s.substring(from, to)));
lastIndex = to;
}
return results;
};
};
} else if (_regex) {
Pattern pattern = Pattern.compile(_separator);
rowVisitor = new ColumnSplitRowVisitor(column.getCellIndex(), columnNames, rowIndices, tuples) {
Pattern _pattern;
@Override
protected java.util.List<Serializable> split(String s) {
return stringArrayToValueList(_pattern.split(s, _maxColumns));
};
public RowVisitor init(Pattern pattern) {
_pattern = pattern;
return this;
}
}.init(pattern);
} else {
rowVisitor = new ColumnSplitRowVisitor(column.getCellIndex(), columnNames, rowIndices, tuples) {
@Override
protected java.util.List<Serializable> split(String s) {
return stringArrayToValueList(
StringUtils.splitByWholeSeparatorPreserveAllTokens(s, _separator, _maxColumns));
};
};
}
filteredRows.accept(project, rowVisitor);
String description =
"Split " + rowIndices.size() +
" cell(s) in column " + _columnName +
" into several columns" +
("separator".equals(_mode) ? " by separator" : " by field lengths");
Change change = new ColumnSplitChange(
_columnName,
columnNames,
rowIndices,
tuples,
_removeOriginalColumn
);
return new HistoryEntry(
historyEntryID, project, description, this, change);
}
protected class ColumnSplitRowVisitor implements RowVisitor {
int cellIndex;
List<String> columnNames;
List<Integer> rowIndices;
List<List<Serializable>> tuples;
int columnNameIndex = 1;
ColumnSplitRowVisitor(
int cellIndex,
List<String> columnNames,
List<Integer> rowIndices,
List<List<Serializable>> tuples
) {
this.cellIndex = cellIndex;
this.columnNames = columnNames;
this.rowIndices = rowIndices;
this.tuples = tuples;
}
@Override
public void start(Project project) {
// nothing to do
}
@Override
public void end(Project project) {
// nothing to do
}
@Override
public boolean visit(Project project, int rowIndex, Row row) {
Object value = row.getCellValue(cellIndex);
if (ExpressionUtils.isNonBlankData(value)) {
String s = value instanceof String ? ((String) value) : value.toString();
List<Serializable> tuple = split(s);
rowIndices.add(rowIndex);
tuples.add(tuple);
for (int i = columnNames.size(); i < tuple.size(); i++) {
while (true) {
String newColumnName = _columnName + " " + columnNameIndex++;
if (project.columnModel.getColumnByName(newColumnName) == null) {
columnNames.add(newColumnName);
break;
}
}
}
}
return false;
}
protected List<Serializable> split(String s) {
throw new UnsupportedOperationException();
}
protected Serializable stringToValue(String s) {
return _guessCellType ? ImporterUtilities.parseCellValue(s) : s;
}
protected List<Serializable> stringArrayToValueList(String[] cells) {
List<Serializable> results = new ArrayList<Serializable>(cells.length);
for (String cell : cells) {
results.add(stringToValue(cell));
}
return results;
}
}
}