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The core API for working with Metaschema-based models.
/*
* Portions of this software was developed by employees of the National Institute
* of Standards and Technology (NIST), an agency of the Federal Government and is
* being made available as a public service. Pursuant to title 17 United States
* Code Section 105, works of NIST employees are not subject to copyright
* protection in the United States. This software may be subject to foreign
* copyright. Permission in the United States and in foreign countries, to the
* extent that NIST may hold copyright, to use, copy, modify, create derivative
* works, and distribute this software and its documentation without fee is hereby
* granted on a non-exclusive basis, provided that this notice and disclaimer
* of warranty appears in all copies.
*
* THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
* EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
* THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
* INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE
* SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE. IN NO EVENT
* SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
* INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
* OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY,
* CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
* PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT
* OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER.
*/
package gov.nist.secauto.metaschema.model.common.util;
import org.jetbrains.annotations.NotNull;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.stream.Collector;
import java.util.stream.Collectors;
public final class CustomCollectors {
private CustomCollectors() {
// disable
}
public static Collector joiningWithOxfordComma(@NotNull String conjunction) {
return Collectors.collectingAndThen(Collectors.toList(), withOxfordComma(conjunction));
}
private static Function, String> withOxfordComma(@NotNull String conjunction) {
return list -> {
int size = list.size();
if (size < 2) {
return String.join("", list);
}
if (size == 2) {
return String.join(" " + conjunction + " ", list);
}
// else there are 3 or more
int last = size - 1;
return String.join(", " + conjunction + " ",
String.join(", ", list.subList(0, last)),
list.get(last));
};
}
public static Collector> toMap(
@NotNull Function super T, ? extends K> keyMapper,
@NotNull Function super T, ? extends V> valueMapper,
@NotNull DuplicateHandler duplicateHander) {
return Collector.of(
HashMap::new,
(map, item) -> {
K key = keyMapper.apply(item);
V value = Objects.requireNonNull(valueMapper.apply(item));
V oldValue = map.get(key);
if (oldValue != null) {
value = duplicateHander.handle(key, oldValue, value);
}
map.put(key, value);
},
(map1, map2) -> {
map2.forEach((key, value) -> {
V oldValue = map1.get(key);
if (oldValue != null) {
value = duplicateHander.handle(key, oldValue, value);
}
map1.put(key, value);
});
return map1;
});
}
@FunctionalInterface
public interface DuplicateHandler {
@NotNull
V handle(K key, @NotNull V value1, V value2);
}
@NotNull
public static BinaryOperator useFirstMapper() {
return (value1, value2) -> value1;
}
@NotNull
public static BinaryOperator useLastMapper() {
return (value1, value2) -> value2;
}
}
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