public Column get_column(String table, String key, ColumnPath column_path, int consistency_level)
throws InvalidRequestException, NotFoundException {
if (logger.isDebugEnabled()) logger.debug("get_column");
ThriftValidation.validateColumnPath(table, column_path);
QueryPath path = new QueryPath(column_path.column_family, column_path.super_column);
ColumnFamily cfamily =
readColumnFamily(
new SliceByNamesReadCommand(table, key, path, Arrays.asList(column_path.column)),
consistency_level);
// TODO can we leverage getSlice here and just check that it returns one column?
if (cfamily == null) {
throw new NotFoundException();
}
Collection<IColumn> columns = null;
if (column_path.super_column != null) {
IColumn column = cfamily.getColumn(column_path.super_column);
if (column != null) {
columns = column.getSubColumns();
}
} else {
columns = cfamily.getSortedColumns();
}
if (columns == null || columns.size() == 0) {
throw new NotFoundException();
}
assert columns.size() == 1;
IColumn column = columns.iterator().next();
if (column.isMarkedForDelete()) {
throw new NotFoundException();
}
return new Column(column.name(), column.value(), column.timestamp());
}
public static boolean isRelevant(IColumn column, IColumnContainer container, int gcBefore) {
// the column itself must be not gc-able (it is live, or a still relevant tombstone, or has live
// subcolumns), (1)
// and if its container is deleted, the column must be changed more recently than the container
// tombstone (2)
// (since otherwise, the only thing repair cares about is the container tombstone)
long maxChange = column.mostRecentLiveChangeAt();
return (!column.isMarkedForDelete()
|| column.getLocalDeletionTime() > gcBefore
|| maxChange > column.getMarkedForDeleteAt()) // (1)
&& (!container.isMarkedForDelete() || maxChange > container.getMarkedForDeleteAt()); // (2)
}
/*
* Deserialize a particular column since the name is in the form of
* superColumn:column.
*/
public IColumn deserialize(DataInputStream dis, String name, IFilter filter) throws IOException {
if (dis.available() == 0) return null;
String[] names = RowMutation.getColumnAndColumnFamily(name);
if (names.length == 1) {
IColumn superColumn = defreezeSuperColumn(dis);
if (name.equals(superColumn.name())) {
if (!superColumn.isMarkedForDelete()) {
/* read the number of columns stored */
int size = dis.readInt();
/* read the size of all columns */
dis.readInt();
IColumn column = null;
for (int i = 0; i < size; ++i) {
column = Column.serializer().deserialize(dis, filter);
if (column != null) {
superColumn.addColumn(column.name(), column);
column = null;
if (filter.isDone()) {
break;
}
}
}
}
return superColumn;
} else {
/* read the number of columns stored */
dis.readInt();
/* read the size of all columns to skip */
int size = dis.readInt();
dis.skip(size);
return null;
}
}
SuperColumn superColumn = defreezeSuperColumn(dis);
if (!superColumn.isMarkedForDelete()) {
int size = dis.readInt();
/* skip the size of the columns */
dis.readInt();
if (size > 0) {
for (int i = 0; i < size; ++i) {
IColumn subColumn = Column.serializer().deserialize(dis, names[1], filter);
if (subColumn != null) {
superColumn.addColumn(subColumn.name(), subColumn);
break;
}
}
}
}
return superColumn;
}
public IColumn deserialize(DataInputStream dis, IFilter filter) throws IOException {
if (dis.available() == 0) return null;
IColumn superColumn = defreezeSuperColumn(dis);
superColumn = filter.filter(superColumn, dis);
if (superColumn != null) {
if (!superColumn.isMarkedForDelete()) fillSuperColumn(superColumn, dis);
return superColumn;
} else {
/* read the number of columns stored */
dis.readInt();
/* read the size of all columns to skip */
int size = dis.readInt();
dis.skip(size);
return null;
}
}
public List<Column> thriftifyColumns(Collection<IColumn> columns, boolean reverseOrder) {
if (columns == null || columns.isEmpty()) {
return EMPTY_COLUMNS;
}
ArrayList<Column> thriftColumns = new ArrayList<Column>(columns.size());
for (IColumn column : columns) {
if (column.isMarkedForDelete()) {
continue;
}
Column thrift_column = new Column(column.name(), column.value(), column.timestamp());
thriftColumns.add(thrift_column);
}
// we have to do the reversing here, since internally we pass results around in ColumnFamily
// objects, which always sort their columns in the "natural" order
if (reverseOrder) Collections.reverse(thriftColumns);
return thriftColumns;
}
private static boolean isLive(ColumnFamily cf, IColumn c) {
return c != null && !c.isMarkedForDelete() && !cf.deletionInfo().isDeleted(c);
}
