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Some stellar general purpose utils.

There is a newer version: 0.36

/*
 * Copyright (C) Posten Norge AS
 *
 * 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 no.digipost;

import java.util.Map;
import java.util.Map.Entry;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.stream.Stream;

public final class DiggMaps {

    public static  Stream unMapToValues(Map map, BiConsumer consumer) {
        return unMap(map, entry -> {
            consumer.accept(entry.getValue(), entry.getKey());
            return entry.getValue();
        });
    }

    public static  Stream unMapToKeys(Map map, BiConsumer consumer) {
        return unMap(map, entry -> {
            consumer.accept(entry.getKey(), entry.getValue());
            return entry.getKey();
        });
    }

    public static  Stream unMap(Map map, BiFunction unmapper) {
        return map.entrySet().stream().map(entry -> unmapper.apply(entry.getKey(), entry.getValue()));
    }

    public static  Stream unMap(Map map, Function, R> unmapper) {
        return map.entrySet().stream().map(unmapper);
    }

    private DiggMaps() {}
}