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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.plugin.util;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.function.BiFunction;
/**
* @author Tony Vaagenes
* @author ollivir
*/
public class Maps {
public static <K, V> Map<K, V> combine(Map<K, V> left, Map<K, V> right, BiFunction<V, V, V> combiner) {
Map<K, V> ret = new HashMap<>();
Set<K> keysRight = new HashSet<>(right.keySet());
left.forEach((k, v) -> {
if (keysRight.contains(k)) {
ret.put(k, combiner.apply(v, right.get(k)));
keysRight.remove(k);
} else {
ret.put(k, v);
}
});
keysRight.forEach(k -> ret.put(k, right.get(k)));
return ret;
}
}
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