/*
* Druid - a distributed column store.
* Copyright (C) 2012, 2013 Metamarkets Group Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package io.druid.segment;
import com.metamx.collections.bitmap.BitmapFactory;
import com.metamx.collections.bitmap.ImmutableBitmap;
import com.metamx.collections.spatial.ImmutableRTree;
import com.metamx.common.guava.CloseQuietly;
import io.druid.query.filter.BitmapIndexSelector;
import io.druid.segment.column.Column;
import io.druid.segment.column.DictionaryEncodedColumn;
import io.druid.segment.column.GenericColumn;
import io.druid.segment.data.Indexed;
import io.druid.segment.data.IndexedIterable;
import java.util.Iterator;
/**
*/
public class ColumnSelectorBitmapIndexSelector implements BitmapIndexSelector
{
private final BitmapFactory bitmapFactory;
private final ColumnSelector index;
public ColumnSelectorBitmapIndexSelector(
final BitmapFactory bitmapFactory,
final ColumnSelector index
)
{
this.bitmapFactory = bitmapFactory;
this.index = index;
}
@Override
public Indexed<String> getDimensionValues(String dimension)
{
final Column columnDesc = index.getColumn(dimension.toLowerCase());
if (columnDesc == null || !columnDesc.getCapabilities().isDictionaryEncoded()) {
return null;
}
final DictionaryEncodedColumn column = columnDesc.getDictionaryEncoding();
return new Indexed<String>()
{
@Override
public Class<? extends String> getClazz()
{
return String.class;
}
@Override
public int size()
{
return column.getCardinality();
}
@Override
public String get(int index)
{
return column.lookupName(index);
}
@Override
public int indexOf(String value)
{
return column.lookupId(value);
}
@Override
public Iterator<String> iterator()
{
return IndexedIterable.create(this).iterator();
}
};
}
@Override
public int getNumRows()
{
GenericColumn column = null;
try {
column = index.getColumn(Column.TIME_COLUMN_NAME).getGenericColumn();
return column.length();
}
finally {
CloseQuietly.close(column);
}
}
@Override
public BitmapFactory getBitmapFactory()
{
return bitmapFactory;
}
@Override
public ImmutableBitmap getBitmapIndex(String dimension, String value)
{
final Column column = index.getColumn(dimension.toLowerCase());
if (column == null) {
return bitmapFactory.makeEmptyImmutableBitmap();
}
if (!column.getCapabilities().hasBitmapIndexes()) {
bitmapFactory.makeEmptyImmutableBitmap();
}
return column.getBitmapIndex().getBitmap(value);
}
@Override
public ImmutableBitmap getBitmapIndex(String dimension, int idx)
{
final Column column = index.getColumn(dimension.toLowerCase());
if (column == null || column.getCapabilities() == null) {
bitmapFactory.makeEmptyImmutableBitmap();
}
if (!column.getCapabilities().hasBitmapIndexes()) {
bitmapFactory.makeEmptyImmutableBitmap();
}
// This is a workaround given the current state of indexing, I feel shame
final int index1 = column.getBitmapIndex().hasNulls() ? idx + 1 : idx;
return column.getBitmapIndex().getBitmap(index1);
}
@Override
public ImmutableRTree getSpatialIndex(String dimension)
{
final Column column = index.getColumn(dimension.toLowerCase());
if (column == null || !column.getCapabilities().hasSpatialIndexes()) {
return new ImmutableRTree();
}
return column.getSpatialIndex().getRTree();
}
}