io.druid.segment.virtual.BaseSingleValueDimensionSelector Maven / Gradle / Ivy
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* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package io.druid.segment.virtual;
import com.google.common.base.Predicate;
import io.druid.query.filter.ValueMatcher;
import io.druid.query.monomorphicprocessing.CalledFromHotLoop;
import io.druid.query.monomorphicprocessing.RuntimeShapeInspector;
import io.druid.segment.DimensionSelector;
import io.druid.segment.IdLookup;
import io.druid.segment.SingleValueDimensionSelector;
import io.druid.segment.data.IndexedInts;
import io.druid.segment.data.ZeroIndexedInts;
import javax.annotation.Nullable;
import java.util.Objects;
public abstract class BaseSingleValueDimensionSelector implements SingleValueDimensionSelector
{
@CalledFromHotLoop
protected abstract String getValue();
@Override
public IndexedInts getRow()
{
return ZeroIndexedInts.instance();
}
@Override
public int getRowValue()
{
return 0;
}
@Override
public int getValueCardinality()
{
return DimensionSelector.CARDINALITY_UNKNOWN;
}
@Override
public String lookupName(int id)
{
return getValue();
}
@Override
public ValueMatcher makeValueMatcher(final String value)
{
return new ValueMatcher()
{
@Override
public boolean matches()
{
return Objects.equals(getValue(), value);
}
@Override
public void inspectRuntimeShape(RuntimeShapeInspector inspector)
{
inspector.visit("selector", BaseSingleValueDimensionSelector.this);
}
};
}
@Override
public ValueMatcher makeValueMatcher(final Predicate predicate)
{
return new ValueMatcher()
{
@Override
public boolean matches()
{
return predicate.apply(getValue());
}
@Override
public void inspectRuntimeShape(RuntimeShapeInspector inspector)
{
inspector.visit("selector", BaseSingleValueDimensionSelector.this);
inspector.visit("predicate", predicate);
}
};
}
@Override
public boolean nameLookupPossibleInAdvance()
{
return false;
}
@Nullable
@Override
public IdLookup idLookup()
{
return null;
}
}