io.timeandspace.smoothie.SmoothieMapWithCustomKeyHashFunction Maven / Gradle / Ivy

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Map implementation with low footprint and no latency spikes

There is a newer version: 2.0.2

/*
 * Copyright (C) The SmoothieMap Authors
 *
 * 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.timeandspace.smoothie;

import java.util.function.ToLongFunction;

import static io.timeandspace.smoothie.ObjectSize.classSizeInBytes;

class SmoothieMapWithCustomKeyHashFunction extends SmoothieMap {
    private static final long SIZE_IN_BYTES =
            classSizeInBytes(SmoothieMapWithCustomKeyHashFunction.class);

    private final ToLongFunction keyHashFunction;

    SmoothieMapWithCustomKeyHashFunction(SmoothieMapBuilder builder) {
        super(builder);
        keyHashFunction = builder.keyHashFunction();
    }

    @Override
    long keyHashCode(Object key) {
        //noinspection unchecked
        return keyHashFunction.applyAsLong((K) key);
    }

    @Override
    ToLongFunction getKeyHashFunction() {
        return keyHashFunction;
    }

    /** Doesn't account for {@link #keyHashFunction}. */
    @Override
    long smoothieMapClassSizeInBytes() {
        return SIZE_IN_BYTES;
    }
}