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Carefully designed and efficient extension of the Java Collections Framework with primitive specializations and more, built for Java 8 (Implementation)

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/*
 * Copyright 2014 the original author or 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 com.koloboke.collect.impl.hash;

import com.koloboke.collect.impl.*;

import java.util.Arrays;


public abstract class MutableParallelKVFloatQHashSO extends MutableQHash
        implements ParallelKVFloatQHash, PrimitiveConstants, UnsafeConstants {

    long[] table;

    void copy(ParallelKVFloatQHash hash) {
        super.copy(hash);
        table = hash.table().clone();
    }

    void move(ParallelKVFloatQHash hash) {
        super.copy(hash);
        table = hash.table();
    }


    public boolean contains(Object key) {
        return contains(((Float) key).floatValue());
    }

    public boolean contains(float key) {
        return index(Float.floatToIntBits(key)) >= 0;
    }

    public boolean contains(int key) {
        return index(key) >= 0;
    }

    int index(int key) {
        long[] tab = table;
        int capacity, index;
        int cur;
        long entry;
        if ((cur = (int) (entry = tab[index = ParallelKVFloatKeyMixing.mix(key) % (capacity = tab.length)])) == key) {
            // key is present
            return index;
        } else {
            if (cur == FREE_BITS) {
                // key is absent, free slot
                return -1;
            } else {
                int bIndex = index, fIndex = index, step = 1;
                while (true) {
                    if ((bIndex -= step) < 0) bIndex += capacity;
                    if ((cur = (int) (entry = tab[bIndex])) == key) {
                        // key is present
                        return bIndex;
                    } else if (cur == FREE_BITS) {
                        // key is absent, free slot
                        return -1;
                    }
                    int t;
                    if ((t = (fIndex += step) - capacity) >= 0) fIndex = t;
                    if ((cur = (int) (entry = tab[fIndex])) == key) {
                        // key is present
                        return fIndex;
                    } else if (cur == FREE_BITS) {
                        // key is absent, free slot
                        return -1;
                    }
                    step += 2;
                }
            }
        }
    }


    @Override
    void allocateArrays(int capacity) {
        table = new long[capacity];
        IntArrays.fillKeys(table, FREE_BITS);
    }

    @Override
    public void clear() {
        super.clear();
        IntArrays.fillKeys(table, FREE_BITS);
    }

    @Override
    void removeAt(int index) {
        U.putInt(table, LONG_BASE + FLOAT_KEY_OFFSET + (((long) index) << LONG_SCALE_SHIFT),
                REMOVED_BITS);
    }
}