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

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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;


public interface DHash extends Hash {


    class SeparateKVByteKeyMixing {
        public static int mix(byte key) {
            return key & Integer.MAX_VALUE;
        }
    }
    class SeparateKVCharKeyMixing {
        public static int mix(char key) {
            return key;
        }
    }
    class SeparateKVShortKeyMixing {
        public static int mix(short key) {
            return key & Integer.MAX_VALUE;
        }
    }
    class SeparateKVIntKeyMixing {
        public static int mix(int key) {
            return key & Integer.MAX_VALUE;
        }
    }
    class SeparateKVFloatKeyMixing {
        public static int mix(int key) {
            return key & Integer.MAX_VALUE;
        }
    }

    class SeparateKVDoubleKeyMixing {
        public static int mix(long key) {
            // not to loose information about 31-32 and 63-64-th bits
            long h = key ^ (key >> 40) ^ (key >> 24);
            return ((int) h) & Integer.MAX_VALUE;
        }
    }
    class SeparateKVLongKeyMixing {
        public static int mix(long key) {
            // not to loose information about 31-32 and 63-64-th bits
            long h = key ^ (key >> 40) ^ (key >> 24);
            return ((int) h) & Integer.MAX_VALUE;
        }
    }

    class SeparateKVObjKeyMixing {
        public static int mix(int hash) {
            return hash & Integer.MAX_VALUE;
        }
    }


    class ParallelKVByteKeyMixing {
        public static int mix(byte key) {
            return key & Integer.MAX_VALUE;
        }
    }
    class ParallelKVCharKeyMixing {
        public static int mix(char key) {
            return key;
        }
    }
    class ParallelKVShortKeyMixing {
        public static int mix(short key) {
            return key & Integer.MAX_VALUE;
        }
    }
    class ParallelKVIntKeyMixing {
        public static int mix(int key) {
            return key & Integer.MAX_VALUE;
        }
    }
    class ParallelKVFloatKeyMixing {
        public static int mix(int key) {
            return key & Integer.MAX_VALUE;
        }
    }

    class ParallelKVDoubleKeyMixing {
        public static int mix(long key) {
            // not to loose information about 31-32 and 63-64-th bits
            long h = key ^ (key >> 40) ^ (key >> 24);
            return (((int) h) << 2) >>> 1;
        }
    }
    class ParallelKVLongKeyMixing {
        public static int mix(long key) {
            // not to loose information about 31-32 and 63-64-th bits
            long h = key ^ (key >> 40) ^ (key >> 24);
            return (((int) h) << 2) >>> 1;
        }
    }

    class ParallelKVObjKeyMixing {
        public static int mix(int hash) {
            return (hash << 2) >>> 1;
        }
    }

}