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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.Equivalence;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;


public final class ImmutableQHashObjSet extends ImmutableQHashObjSetGO {

    static final class WithCustomEquivalence extends ImmutableQHashObjSetGO {
        Equivalence equivalence;

        @SuppressWarnings("unchecked")
        @Override
        @Nonnull
        public Equivalence equivalence() {
            return (Equivalence) equivalence;
        }

        @Override
        boolean nullableKeyEquals(@Nullable E a, @Nullable E b) {
            return equivalence.nullableEquivalent(a, b);
        }

        @Override
        boolean keyEquals(@Nonnull E a, @Nullable E b) {
            return b != null && equivalence.equivalent(a, b);
        }

        @Override
        int nullableKeyHashCode(@Nullable E key) {
            return equivalence.nullableHash(key);
        }

        @Override
        int keyHashCode(@Nonnull E key) {
            return equivalence.hash(key);
        }
    }
}