// Map HGrid to HHisItem[]. Grid must have ts and val columns.
public static HHisItem[] gridToItems(HGrid grid)
{
HCol ts = grid.col("ts");
HCol val = grid.col("val");
HHisItem[] items = new HHisItem[grid.numRows];
for (int i = 0; i < items.Length; ++i)
{
HRow row = grid.row(i);
// Timestamp can't be NULL but val can
items[i] = new HHisItem((HDateTime)row.get(ts, true), row.get(val, false));
}
return(items);
}
// Get a cell by column. If cell is null then raise
// UnknownNameException or return null based on checked flag.
public HVal get(HCol col, bool bchecked)
{
HVal val = m_cells[col.Index];
if (val != null)
{
return(val);
}
// Ian Davies - .NET port - this could cause a unknown name exception
// for a null value - back to previous comment
if (bchecked)
{
throw new UnknownNameException(col.Name);
}
return(null);
}
public override string getKeyAt(int iIndex, bool bChecked)
{
string strRet = null;
if (iIndex < Size)
{
HCol col = Grid.col(iIndex);
strRet = col.Name;
}
if ((strRet != null) || (!bChecked))
{
return(strRet);
}
else
{
throw new IndexOutOfRangeException(iIndex.ToString() + " out of range");
}
}
// Get a cell by column name. If the column is undefined or
// the cell is null then raise UnknownNameException or return
// null based on checked flag.
public override HVal get(string name, bool bchecked)
{
HCol col = Grid.col(name, false);
if (col != null)
{
HVal val = get(col, bchecked);
if (val != null)
{
return(val);
}
}
if (bchecked)
{
throw new UnknownNameException(name);
}
return(null);
}
// Get a column by name. If not found and checked if false then
// return null, otherwise throw UnknownNameException
public HCol col(string name, bool bchecked)
{
HCol colRet = null;
if (m_colsByName.ContainsKey(name))
{
colRet = m_colsByName[name];
}
if (colRet != null)
{
return(colRet);
}
if (bchecked)
{
throw new UnknownNameException(name);
}
return(null);
}
public static HaystackColumn Map(HCol value)
{
return(value.Source);
}
// Convenience to build grid from array of HDict.
// Any null entry will be row of all null cells.
public static HGrid dictsToGrid(HDict meta, HDict[] dicts)
{
HCol colEmpty = new HCol(0, "empty", HDict.Empty);
// If empty return an empty cols collection and no values Grid
if (dicts.Length == 0)
{
List <List <HVal> > rowListEmpty = new List <List <HVal> >();
List <HCol> rowEmpty = new List <HCol>();
rowEmpty.Add(colEmpty);
return(new HGrid(meta, rowEmpty, rowListEmpty));
}
HGridBuilder b = new HGridBuilder();
b.Meta.add(meta);
// collect column names - why does this need to be a dictionary (hashmap in the java code)?
// it only stores the col name twice.
Dictionary <string, string> colsByName = new Dictionary <string, string>();
for (int i = 0; i < dicts.Length; ++i)
{
HDict dict = dicts[i];
if (dict != null)
{
for (int it = 0; it < dict.size(); it++)
{
string name = dict.getKeyAt(it, false);
if (name != null)
{
if (!colsByName.Keys.Contains(name))
{
colsByName.Add(name, name);
b.addCol(name);
}
}
}
}
}
// if all dicts were null, handle special case
// by creating a dummy column
if (colsByName.Count == 0)
{
colsByName.Add("empty", "empty");
b.addCol("empty");
}
// now map rows
int numCols = b.colCount;
for (int ri = 0; ri < dicts.Length; ++ri)
{
HDict dict = dicts[ri];
HVal[] cells = new HVal[numCols];
for (int ci = 0; ci < numCols; ++ci)
{
if (dict == null)
{
cells[ci] = null;
}
else
{
BCol colatci = b.GetColAt(ci);
if (colatci != null)
{
cells[ci] = dict.get(colatci.Name, false);
}
}
}
b.addRow(cells);
}
return(b.toGrid());
}
