io.virtdata.libbasics.shared.from_long.to_long.Murmur3DivToLong Maven / Gradle / Ivy

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With inspiration from other libraries

There is a newer version: 2.12.15

/*
 *
 *       Copyright 2015 Jonathan Shook
 *
 *   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.virtdata.libbasics.shared.from_long.to_long;

import io.virtdata.annotations.DeprecatedFunction;
import io.virtdata.annotations.ThreadSafeMapper;
import org.greenrobot.essentials.hash.Murmur3F;

import java.util.function.LongUnaryOperator;


/**
 * Yield a long value which is the result of hashing and modulo division
 * with the specified divisor.
 */
@ThreadSafeMapper
@DeprecatedFunction("This function is easily replaced with other simpler functions.")
public class Murmur3DivToLong implements LongUnaryOperator {

    private ThreadLocal murmur3f_TL = ThreadLocal.withInitial(Murmur3F::new);
    private DivideToLong divideToLongMapper;

    public Murmur3DivToLong(long divisor) {
        this.divideToLongMapper = new DivideToLong(divisor);
    }

    @Override
    public long applyAsLong(long input) {
        long divided= divideToLongMapper.applyAsLong(input);
        Murmur3F murmur3f = murmur3f_TL.get();
        murmur3f.update((int) (divided % Integer.MAX_VALUE));
        return murmur3f.getValue();
    }
}