/*
* 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.filter;
import com.metamx.collections.bitmap.ImmutableBitmap;
import io.druid.query.filter.BitmapIndexSelector;
import io.druid.query.filter.Filter;
import io.druid.query.filter.ValueMatcher;
import io.druid.query.filter.ValueMatcherFactory;
/**
*/
public class NotFilter implements Filter
{
private final Filter baseFilter;
public NotFilter(
Filter baseFilter
)
{
this.baseFilter = baseFilter;
}
@Override
public ImmutableBitmap getBitmapIndex(BitmapIndexSelector selector)
{
return selector.getBitmapFactory().complement(
baseFilter.getBitmapIndex(selector),
selector.getNumRows()
);
}
@Override
public ValueMatcher makeMatcher(ValueMatcherFactory factory)
{
final ValueMatcher baseMatcher = baseFilter.makeMatcher(factory);
return new ValueMatcher()
{
@Override
public boolean matches()
{
return !baseMatcher.matches();
}
};
}
}