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package com.google.refine.operations.cell;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;
import com.google.refine.Jsonizable;
import com.google.refine.browsing.RowVisitor;
import com.google.refine.expr.Evaluable;
import com.google.refine.expr.ExpressionUtils;
import com.google.refine.expr.MetaParser;
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.CellChange;
import com.google.refine.operations.EngineDependentMassCellOperation;
import com.google.refine.operations.OperationRegistry;
import com.google.refine.util.ParsingUtilities;
public class MassEditOperation extends EngineDependentMassCellOperation {
final protected String _expression;
final protected List<Edit> _edits;
static public class Edit implements Jsonizable {
final public List<String> from;
final public boolean fromBlank;
final public boolean fromError;
final public Serializable to;
public Edit(List<String> from, boolean fromBlank, boolean fromError, Serializable to) {
this.from = from;
this.fromBlank = fromBlank;
this.fromError = fromError;
this.to = to;
}
@Override
public void write(JSONWriter writer, Properties options)
throws JSONException {
writer.object();
writer.key("fromBlank"); writer.value(fromBlank);
writer.key("fromError"); writer.value(fromError);
writer.key("from");
writer.array();
for (String s : from) {
writer.value(s);
}
writer.endArray();
writer.key("to"); writer.value(to);
writer.endObject();
}
}
static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
JSONObject engineConfig = obj.has("engineConfig") && !obj.isNull("engineConfig") ?
obj.getJSONObject("engineConfig") : null;
return new MassEditOperation(
engineConfig,
obj.getString("columnName"),
obj.getString("expression"),
reconstructEdits(obj.getJSONArray("edits"))
);
}
static public List<Edit> reconstructEdits(JSONArray editsA) throws Exception {
int editCount = editsA.length();
List<Edit> edits = new ArrayList<Edit>(editCount);
for (int i = 0; i < editCount; i++) {
JSONObject editO = editsA.getJSONObject(i);
List<String> from = null;
if (editO.has("from") && !editO.isNull("from")) {
JSONArray fromA = editO.getJSONArray("from");
int fromCount = fromA.length();
from = new ArrayList<String>(fromCount);
for (int j = 0; j < fromCount; j++) {
from.add(fromA.getString(j));
}
} else {
from = new ArrayList<String>();
}
boolean fromBlank = editO.has("fromBlank") && editO.getBoolean("fromBlank");
boolean fromError = editO.has("fromError") && editO.getBoolean("fromError");
Serializable to = (Serializable) editO.get("to");
if (editO.has("type")) {
String type = editO.getString("type");
if ("date".equals(type)) {
to = ParsingUtilities.stringToDate((String) to);
}
}
edits.add(new Edit(from, fromBlank, fromError, to));
}
return edits;
}
public MassEditOperation(JSONObject engineConfig, String columnName, String expression, List<Edit> edits) {
super(engineConfig, columnName, true);
_expression = expression;
_edits = edits;
}
@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("expression"); writer.value(_expression);
writer.key("edits");
writer.array();
for (Edit edit : _edits) {
edit.write(writer, options);
}
writer.endArray();
writer.endObject();
}
@Override
protected String getBriefDescription(Project project) {
return "Mass edit cells in column " + _columnName;
}
@Override
protected String createDescription(Column column,
List<CellChange> cellChanges) {
return "Mass edit " + cellChanges.size() +
" cells in column " + column.getName();
}
@Override
protected RowVisitor createRowVisitor(Project project, List<CellChange> cellChanges, long historyEntryID) throws Exception {
Column column = project.columnModel.getColumnByName(_columnName);
Evaluable eval = MetaParser.parse(_expression);
Properties bindings = ExpressionUtils.createBindings(project);
Map<String, Serializable> fromTo = new HashMap<String, Serializable>();
Serializable fromBlankTo = null;
Serializable fromErrorTo = null;
for (Edit edit : _edits) {
for (String s : edit.from) {
fromTo.put(s, edit.to);
}
// the last edit wins
if (edit.fromBlank) {
fromBlankTo = edit.to;
}
if (edit.fromError) {
fromErrorTo = edit.to;
}
}
return new RowVisitor() {
int cellIndex;
Properties bindings;
List<CellChange> cellChanges;
Evaluable eval;
Map<String, Serializable> fromTo;
Serializable fromBlankTo;
Serializable fromErrorTo;
public RowVisitor init(
int cellIndex,
Properties bindings,
List<CellChange> cellChanges,
Evaluable eval,
Map<String, Serializable> fromTo,
Serializable fromBlankTo,
Serializable fromErrorTo
) {
this.cellIndex = cellIndex;
this.bindings = bindings;
this.cellChanges = cellChanges;
this.eval = eval;
this.fromTo = fromTo;
this.fromBlankTo = fromBlankTo;
this.fromErrorTo = fromErrorTo;
return this;
}
@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) {
Cell cell = row.getCell(cellIndex);
Cell newCell = null;
ExpressionUtils.bind(bindings, row, rowIndex, _columnName, cell);
Object v = eval.evaluate(bindings);
if (ExpressionUtils.isError(v)) {
if (fromErrorTo != null) {
newCell = new Cell(fromErrorTo, (cell != null) ? cell.recon : null);
}
} else if (ExpressionUtils.isNonBlankData(v)) {
String from = v.toString();
Serializable to = fromTo.get(from);
if (to != null) {
newCell = new Cell(to, (cell != null) ? cell.recon : null);
}
} else {
if (fromBlankTo != null) {
newCell = new Cell(fromBlankTo, (cell != null) ? cell.recon : null);
}
}
if (newCell != null) {
CellChange cellChange = new CellChange(rowIndex, cellIndex, cell, newCell);
cellChanges.add(cellChange);
}
return false;
}
}.init(column.getCellIndex(), bindings, cellChanges, eval, fromTo, fromBlankTo, fromErrorTo);
}
}