/*
 * Copyright (c) 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.virtdata.library.basics.shared.from_long.to_int;

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.murmur.Murmur3F;

import java.nio.ByteBuffer;
import java.util.function.LongToIntFunction;

@ThreadSafeMapper
@Categories({Category.general})
public class SignedHash implements LongToIntFunction {

    private final transient ThreadLocal<ByteBuffer> bb_TL = ThreadLocal.withInitial(() -> ByteBuffer.allocate(Long.BYTES));
    private final transient ThreadLocal<Murmur3F> murmur3f_TL = ThreadLocal.withInitial(Murmur3F::new);

    @Override
    public int applyAsInt(long value) {
        Murmur3F murmur3F = murmur3f_TL.get();
        ByteBuffer bb = bb_TL.get();
        murmur3F.reset();
        bb.putLong(0,value);
        murmur3F.update(bb.array(),0,Long.BYTES);
        long result= murmur3F.getValue();
        return (int) (result & Integer.MAX_VALUE);
    }
}
