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/*
 * Copyright 2019 and onwards Makoto Yui
 *
 * 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 matrix4j.utils.collections;

import it.unimi.dsi.fastutil.ints.Int2FloatMap;
import it.unimi.dsi.fastutil.ints.Int2LongMap;
import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
import it.unimi.dsi.fastutil.objects.Object2ObjectMap;
import it.unimi.dsi.fastutil.objects.ObjectIterable;
import it.unimi.dsi.fastutil.objects.ObjectIterator;
import it.unimi.dsi.fastutil.objects.ObjectSet;

import javax.annotation.Nonnull;

/**
 * Helper class for fastutil (http://fastutil.di.unimi.it/)
 */
public final class Fastutil {

    private Fastutil() {}

    @Nonnull
    public static ObjectIterable fastIterable(@Nonnull final Int2LongMap map) {
        final ObjectSet entries = map.int2LongEntrySet();
        return entries instanceof Int2LongMap.FastEntrySet
                ? new ObjectIterable() {
                    public ObjectIterator iterator() {
                        return ((Int2LongMap.FastEntrySet) entries).fastIterator();
                    }
                }
                : entries;
    }

    @Nonnull
    public static ObjectIterable fastIterable(@Nonnull final Int2FloatMap map) {
        final ObjectSet entries = map.int2FloatEntrySet();
        return entries instanceof Int2FloatMap.FastEntrySet
                ? new ObjectIterable() {
                    public ObjectIterator iterator() {
                        return ((Int2FloatMap.FastEntrySet) entries).fastIterator();
                    }
                }
                : entries;
    }

    @Nonnull
    public static  ObjectIterable> fastIterable(
            @Nonnull final Int2ObjectMap map) {
        final ObjectSet> entries = map.int2ObjectEntrySet();
        return entries instanceof Int2ObjectMap.FastEntrySet
                ? new ObjectIterable>() {
                    public ObjectIterator> iterator() {
                        return ((Int2ObjectMap.FastEntrySet) entries).fastIterator();
                    }
                }
                : entries;
    }

    @Nonnull
    public static  ObjectIterable> fastIterable(
            @Nonnull final Object2ObjectMap map) {
        final ObjectSet> entries = map.object2ObjectEntrySet();
        return entries instanceof Object2ObjectMap.FastEntrySet
                ? new ObjectIterable>() {
                    @SuppressWarnings("unchecked")
                    public ObjectIterator> iterator() {
                        return ((Object2ObjectMap.FastEntrySet) entries).fastIterator();
                    }
                }
                : entries;
    }

}