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Copyright 2010, Google Inc.
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* Redistributions in binary form must reproduce the above
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*/
package com.google.refine.model;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;
import java.util.Properties;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.JsonToken;
import org.json.JSONException;
import org.json.JSONWriter;
import com.google.refine.Jsonizable;
import com.google.refine.expr.CellTuple;
import com.google.refine.expr.HasFields;
import com.google.refine.util.Pool;
/**
* Class representing a single Row which contains a list of {@link Cell}s. There may
* be multiple rows in a {@link Record}.
*/
public class Row implements HasFields, Jsonizable {
public boolean flagged;
public boolean starred;
final public List<Cell> cells;
private static final String FLAGGED = "flagged";
private static final String STARRED = "starred";
/**
* Construct a new Row.
*
* @param cellCount number of cells to give row initially (can be extended later)
*/
public Row(int cellCount) {
cells = new ArrayList<Cell>(cellCount);
}
protected Row(List<Cell> cells, boolean flagged, boolean starred) {
this.cells = cells;
this.flagged = flagged;
this.starred = starred;
}
/**
* Copy a row and return the copy. Note that this is a shallow copy, so
* if the contents of cells are changed in the original, they will be
* be changed in the duplicate.
* @return the duplicated row
*/
public Row dup() {
Row row = new Row(cells.size());
row.flagged = flagged;
row.starred = starred;
row.cells.addAll(cells);
return row;
}
@Override
public Object getField(String name, Properties bindings) {
if (FLAGGED.equals(name)) {
return flagged;
} else if (STARRED.equals(name)) {
return starred;
}
return null;
}
@Override
public boolean fieldAlsoHasFields(String name) {
return "cells".equals(name) || "record".equals(name);
}
public boolean isEmpty() {
for (Cell cell : cells) {
if (cell != null && cell.value != null && !isValueBlank(cell.value)) {
return false;
}
}
return true;
}
/**
* @param cellIndex index of cell to return
* @return given cell or null if cell doesn't exist or cell index is out of range
*/
public Cell getCell(int cellIndex) {
if (cellIndex >= 0 && cellIndex < cells.size()) {
return cells.get(cellIndex);
} else {
return null;
}
}
public Object getCellValue(int cellIndex) {
if (cellIndex >= 0 && cellIndex < cells.size()) {
Cell cell = cells.get(cellIndex);
if (cell != null) {
return cell.value;
}
}
return null;
}
public boolean isCellBlank(int cellIndex) {
return isValueBlank(getCellValue(cellIndex));
}
protected boolean isValueBlank(Object value) {
return value == null || (value instanceof String && ((String) value).trim().length() == 0);
}
public void setCell(int cellIndex, Cell cell) {
if (cellIndex < cells.size()) {
cells.set(cellIndex, cell);
} else {
while (cellIndex > cells.size()) {
cells.add(null);
}
cells.add(cell);
}
}
public CellTuple getCellTuple(Project project) {
return new CellTuple(project, this);
}
@Override
public void write(JSONWriter writer, Properties options)
throws JSONException {
writer.object();
writer.key(FLAGGED); writer.value(flagged);
writer.key(STARRED); writer.value(starred);
writer.key("cells"); writer.array();
for (Cell cell : cells) {
if (cell != null) {
cell.write(writer, options);
} else {
writer.value(null);
}
}
writer.endArray();
if (!"save".equals(options.getProperty("mode"))) {
if (options.containsKey("rowIndex")) {
int rowIndex = (Integer) options.get("rowIndex");
writer.key("i"); writer.value(rowIndex);
if (options.containsKey("recordIndex")) {
int recordIndex = (Integer) options.get("recordIndex");
writer.key("j"); writer.value(recordIndex);
}
}
if (options.containsKey("extra")) {
Properties extra = (Properties) options.get("extra");
if (extra != null) {
for (Entry<Object,Object> e : extra.entrySet()) {
writer.key((String) e.getKey());
writer.value(e.getValue());
}
}
}
}
writer.endObject();
}
public void save(Writer writer, Properties options) {
JSONWriter jsonWriter = new JSONWriter(writer);
try {
write(jsonWriter, options);
} catch (JSONException e) {
e.printStackTrace();
}
}
static public Row load(String s, Pool pool) throws Exception {
return s.length() == 0 ? null :
loadStreaming(s, pool);
}
static public Row loadStreaming(String s, Pool pool) throws Exception {
JsonFactory jsonFactory = new JsonFactory();
JsonParser jp = jsonFactory.createJsonParser(s);
if (jp.nextToken() != JsonToken.START_OBJECT) {
return null;
}
List<Cell> cells = new ArrayList<Cell>();
boolean starred = false;
boolean flagged = false;
while (jp.nextToken() != JsonToken.END_OBJECT) {
String fieldName = jp.getCurrentName();
jp.nextToken();
if (STARRED.equals(fieldName)) {
starred = jp.getBooleanValue();
} else if (FLAGGED.equals(fieldName)) {
flagged = jp.getBooleanValue();
} else if ("cells".equals(fieldName)) {
if (jp.getCurrentToken() != JsonToken.START_ARRAY) {
return null;
}
while (jp.nextToken() != JsonToken.END_ARRAY) {
Cell cell = Cell.loadStreaming(jp, pool);
cells.add(cell);
}
}
}
return (cells.size() > 0) ? new Row(cells, flagged, starred) : new Row(0);
}
@Override
public String toString() {
StringBuffer result = new StringBuffer();
for (Cell cell : cells) {
result.append(cell == null ? "null" : cell.toString());
result.append(',');
}
return result.toString();
}
}