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HashMaps

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DmitriyMX
2021-10-08 13:22:35 +03:00
parent 076c589fbd
commit 262d4ee984
1 changed files with 156 additions and 0 deletions
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src/main/java/ghast/HashMaps.java Normal file
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package ghast;
import lombok.*;
import java.util.HashMap;
import java.util.Map;
/**
* Создание Map как в Java 9+.
*/
@SuppressWarnings("DuplicatedCode")
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public final class HashMaps {
public static <K, V> Map<K, V> of() {
return new HashMap<>(0);
}
public static <K, V> Map<K, V> of(K k1, V v1) {
return new HashMap<K, V>() {{
put(k1, v1);
}};
}
public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2) {
return new HashMap<K, V>() {{
put(k1, v1);
put(k2, v2);
}};
}
public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3) {
return new HashMap<K, V>() {{
put(k1, v1);
put(k2, v2);
put(k3, v3);
}};
}
public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4) {
return new HashMap<K, V>() {{
put(k1, v1);
put(k2, v2);
put(k3, v3);
put(k4, v4);
}};
}
public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5) {
return new HashMap<K, V>() {{
put(k1, v1);
put(k2, v2);
put(k3, v3);
put(k4, v4);
put(k5, v5);
}};
}
public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5,
K k6, V v6) {
return new HashMap<K, V>() {{
put(k1, v1);
put(k2, v2);
put(k3, v3);
put(k4, v4);
put(k5, v5);
put(k6, v6);
}};
}
public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5,
K k6, V v6, K k7, V v7) {
return new HashMap<K, V>() {{
put(k1, v1);
put(k2, v2);
put(k3, v3);
put(k4, v4);
put(k5, v5);
put(k6, v6);
put(k7, v7);
}};
}
public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5,
K k6, V v6, K k7, V v7, K k8, V v8) {
return new HashMap<K, V>() {{
put(k1, v1);
put(k2, v2);
put(k3, v3);
put(k4, v4);
put(k5, v5);
put(k6, v6);
put(k7, v7);
put(k8, v8);
}};
}
public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5,
K k6, V v6, K k7, V v7, K k8, V v8, K k9, V v9) {
return new HashMap<K, V>() {{
put(k1, v1);
put(k2, v2);
put(k3, v3);
put(k4, v4);
put(k5, v5);
put(k6, v6);
put(k7, v7);
put(k8, v8);
put(k9, v9);
}};
}
public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5,
K k6, V v6, K k7, V v7, K k8, V v8, K k9, V v9, K k10, V v10) {
return new HashMap<K, V>() {{
put(k1, v1);
put(k2, v2);
put(k3, v3);
put(k4, v4);
put(k5, v5);
put(k6, v6);
put(k7, v7);
put(k8, v8);
put(k9, v9);
put(k10, v10);
}};
}
@SafeVarargs
public static <K, V> Map<K, V> ofEntries(Map.Entry<? extends K, ? extends V>... entries) {
if (entries == null || entries.length == 0) {
return of();
}
Map<K, V> map = new HashMap<>(entries.length);
for (Map.Entry<? extends K, ? extends V> entry : entries) {
map.put(entry.getKey(), entry.getValue());
}
return map;
}
public static <K, V> Map.Entry<K, V> entry(K k, V v) {
return new SimpleEntry<>(k, v);
}
@AllArgsConstructor
@Getter
@Setter
@EqualsAndHashCode
private static class SimpleEntry<K, V> implements Map.Entry<K, V> {
private final K key;
private V value;
}
}