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package com.google.refine.model;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Properties;
import org.json.JSONException;
import org.json.JSONWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.refine.Jsonizable;
import com.google.refine.expr.ExpressionUtils;
public class RecordModel implements Jsonizable {
final static Logger logger = LoggerFactory.getLogger("RecordModel");
final static public class CellDependency {
final public int rowIndex;
final public int cellIndex;
public CellDependency(int rowIndex, int cellIndex) {
this.rowIndex = rowIndex;
this.cellIndex = cellIndex;
}
@Override
public String toString() {
return rowIndex+","+cellIndex;
}
}
final static public class RowDependency {
public int recordIndex;
public CellDependency[] cellDependencies;
public List<Integer> contextRows;
@Override
public String toString() {
return "Idx: "+recordIndex+" CellDeps: "+Arrays.toString(cellDependencies)+" Rows:"+contextRows;
}
}
protected List<RowDependency> _rowDependencies;
protected List<Record> _records;
public RowDependency getRowDependency(int rowIndex) {
return _rowDependencies != null && rowIndex >= 0 && rowIndex < _rowDependencies.size() ?
_rowDependencies.get(rowIndex) : null;
}
public int getRecordCount() {
return _records.size();
}
public Record getRecord(int recordIndex) {
return _records != null && recordIndex >= 0 && recordIndex < _records.size() ?
_records.get(recordIndex) : null;
}
public Record getRecordOfRow(int rowIndex) {
RowDependency rd = getRowDependency(rowIndex);
if (rd != null) {
if (rd.recordIndex < 0) {
rd = getRowDependency(rd.contextRows.get(0));
}
return getRecord(rd.recordIndex);
}
return null;
}
@Override
synchronized public void write(JSONWriter writer, Properties options)
throws JSONException {
writer.object();
writer.key("hasRecords");
writer.value(
_records != null && _rowDependencies != null &&
_records.size() < _rowDependencies.size());
writer.endObject();
}
static protected class KeyedGroup {
int[] cellIndices;
int keyCellIndex;
@Override
public String toString() {
StringBuffer sb = new StringBuffer();
for (int i:cellIndices) {
sb.append(i).append(',');
}
return "key: " + keyCellIndex + " cells: " + sb.toString();
}
}
synchronized public void update(Project project) {
synchronized (project) {
List<Row> rows = project.rows;
int rowCount = rows.size();
ColumnModel columnModel = project.columnModel;
List<KeyedGroup> keyedGroups = computeKeyedGroups(columnModel);
int groupCount = keyedGroups.size();
int[] lastNonBlankRowsByGroup = new int[keyedGroups.size()];
for (int i = 0; i < lastNonBlankRowsByGroup.length; i++) {
lastNonBlankRowsByGroup[i] = -1;
}
_rowDependencies = new ArrayList<RowDependency>(rowCount);
int recordIndex = 0;
for (int r = 0; r < rowCount; r++) {
Row row = rows.get(r);
RowDependency rowDependency = new RowDependency();
for (int g = 0; g < groupCount; g++) {
KeyedGroup group = keyedGroups.get(g);
if (!ExpressionUtils.isNonBlankData(row.getCellValue(group.keyCellIndex))) {
int contextRowIndex = lastNonBlankRowsByGroup[g];
if (contextRowIndex >= 0) {
for (int dependentCellIndex : group.cellIndices) {
if (ExpressionUtils.isNonBlankData(row.getCellValue(dependentCellIndex))) {
setRowDependency(
project,
rowDependency,
dependentCellIndex,
contextRowIndex,
group.keyCellIndex
);
}
}
}
} else {
lastNonBlankRowsByGroup[g] = r;
}
}
if (rowDependency.cellDependencies != null && rowDependency.cellDependencies.length > 0) {
rowDependency.recordIndex = -1;
rowDependency.contextRows = new ArrayList<Integer>();
for (CellDependency cd : rowDependency.cellDependencies) {
if (cd != null) {
rowDependency.contextRows.add(cd.rowIndex);
}
}
Collections.sort(rowDependency.contextRows);
} else {
rowDependency.recordIndex = recordIndex++;
}
_rowDependencies.add(rowDependency);
}
_records = new ArrayList<Record>(recordIndex);
if (recordIndex > 0) {
recordIndex = 0;
int recordRowIndex = 0;
for (int r = 1; r < rowCount; r++) {
RowDependency rd = _rowDependencies.get(r);
if (rd.recordIndex >= 0) {
_records.add(new Record(recordRowIndex, r, recordIndex++));
recordIndex = rd.recordIndex;
recordRowIndex = r;
}
}
_records.add(new Record(recordRowIndex, rowCount, recordIndex++));
}
}
}
protected List<KeyedGroup> computeKeyedGroups(ColumnModel columnModel) {
List<KeyedGroup> keyedGroups = new ArrayList<KeyedGroup>();
addRootKeyedGroup(columnModel, keyedGroups);
for (ColumnGroup group : columnModel.columnGroups) {
if (group.keyColumnIndex >= 0) {
KeyedGroup keyedGroup = new KeyedGroup();
keyedGroup.keyCellIndex = columnModel.columns.get(group.keyColumnIndex).getCellIndex();
keyedGroup.cellIndices = new int[group.columnSpan - 1];
int c = 0;
for (int i = 0; i < group.columnSpan; i++) {
int columnIndex = group.startColumnIndex + i;
if (columnIndex != group.keyColumnIndex && columnIndex < columnModel.columns.size()) {
int cellIndex = columnModel.columns.get(columnIndex).getCellIndex();
keyedGroup.cellIndices[c++] = cellIndex;
}
}
keyedGroups.add(keyedGroup);
}
}
Collections.sort(keyedGroups, new Comparator<KeyedGroup>() {
@Override
public int compare(KeyedGroup o1, KeyedGroup o2) {
return o2.cellIndices.length - o1.cellIndices.length; // larger groups first
}
});
dumpKeyedGroups(keyedGroups, columnModel); // for debug
return keyedGroups;
}
// debugging helper
private void dumpKeyedGroups(List<KeyedGroup> groups, ColumnModel columnModel) {
for (KeyedGroup g : groups) {
String keyColName = columnModel.getColumnByCellIndex(g.keyCellIndex).getName();
StringBuffer sb = new StringBuffer();
for (int ci : g.cellIndices) {
Column col = columnModel.getColumnByCellIndex(ci);
if (col != null) {
// Old projects have col 0 slot empty
sb.append(col.getName()).append(',');
}
}
logger.trace("KeyedGroup " + keyColName + "::" + sb.toString());
}
}
protected void addRootKeyedGroup(ColumnModel columnModel, List<KeyedGroup> keyedGroups) {
int count = columnModel.getMaxCellIndex() + 1;
if (count > 0 && columnModel.getKeyColumnIndex() < columnModel.columns.size()) {
KeyedGroup rootKeyedGroup = new KeyedGroup();
rootKeyedGroup.cellIndices = new int[count - 1];
rootKeyedGroup.keyCellIndex = columnModel.columns.get(columnModel.getKeyColumnIndex()).getCellIndex();
for (int i = 0; i < count; i++) {
if (i < rootKeyedGroup.keyCellIndex) {
rootKeyedGroup.cellIndices[i] = i;
} else if (i > rootKeyedGroup.keyCellIndex) {
rootKeyedGroup.cellIndices[i - 1] = i;
}
}
keyedGroups.add(rootKeyedGroup);
}
}
protected void setRowDependency(
Project project,
RowDependency rowDependency,
int cellIndex,
int contextRowIndex,
int contextCellIndex
) {
if (rowDependency.cellDependencies == null) {
int count = project.columnModel.getMaxCellIndex() + 1;
rowDependency.cellDependencies = new CellDependency[count];
}
rowDependency.cellDependencies[cellIndex] =
new CellDependency(contextRowIndex, contextCellIndex);
}
}