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NormalizeCqlVector.java
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NormalizeCqlVector.java
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/*
* Copyright (c) 2023 nosqlbench
*
* Licensed 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.nosqlbench.datamappers.functions.geometry;
import com.datastax.oss.driver.api.core.data.CqlVector;
import io.nosqlbench.virtdata.api.annotations.Categories;
import io.nosqlbench.virtdata.api.annotations.Category;
import io.nosqlbench.virtdata.api.annotations.ThreadSafeMapper;
import io.nosqlbench.virtdata.library.basics.shared.from_long.to_vector.NormalizeDoubleListVector;
import io.nosqlbench.virtdata.library.basics.shared.from_long.to_vector.NormalizeFloatListVector;
import java.util.Arrays;
import java.util.List;
import java.util.function.Function;
/**
* Normalize a vector in List<Number> form, calling the appropriate conversion function
* depending on the component (Class) type of the incoming List values.
*/
@ThreadSafeMapper
@Categories(Category.experimental)
public class NormalizeCqlVector implements Function<CqlVector, CqlVector> {
private final NormalizeDoubleListVector ndv = new NormalizeDoubleListVector();
private final NormalizeFloatListVector nfv = new NormalizeFloatListVector();
@Override
public CqlVector apply(CqlVector cqlVector) {
double[] vals = new double[cqlVector.size()];
double accumulator= 0.0d;
for (int i = 0; i < vals.length; i++) {
vals[i]=cqlVector.get(i).doubleValue();
accumulator+=vals[i]*vals[i];
}
double factor = 1.0d/Math.sqrt(Arrays.stream(vals).map(d -> d * d).sum());
if (cqlVector.get(0) instanceof Float) {
List<Float> list = Arrays.stream(vals).mapToObj(d -> Float.valueOf((float) (d * factor))).toList();
return CqlVector.newInstance(list);
} else if (cqlVector.get(0) instanceof Double) {
List<Double> list = Arrays.stream(vals).mapToObj(d -> Double.valueOf((float) (d * factor))).toList();
return CqlVector.newInstance(list);
} else {
throw new RuntimeException(NormalizeCqlVector.class.getCanonicalName()+ " only supports Double and Float type");
}
}
}