io.stargate.db.schema.ImmutableKeyspace Maven / Gradle / Ivy
package io.stargate.db.schema;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.io.ObjectStreamException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import javax.annotation.Nullable;
import javax.annotation.ParametersAreNonnullByDefault;
import javax.annotation.concurrent.Immutable;
import javax.annotation.concurrent.NotThreadSafe;
import org.immutables.value.Generated;
/**
* Immutable implementation of {@link Keyspace}.
*
* Use the builder to create immutable instances:
* {@code ImmutableKeyspace.builder()}.
*/
@Generated(from = "Keyspace", generator = "Immutables")
@SuppressWarnings({"all"})
@SuppressFBWarnings
@ParametersAreNonnullByDefault
@javax.annotation.Generated("org.immutables.processor.ProxyProcessor")
@Immutable
public final class ImmutableKeyspace extends Keyspace {
private final String name;
private final Set
tables;
private final List userDefinedTypes;
private final Map replication;
private final @Nullable Boolean durableWrites;
private final int hashCode;
private ImmutableKeyspace(
String name,
Set tables,
List userDefinedTypes,
Map replication,
@Nullable Boolean durableWrites) {
this.name = name;
this.tables = tables;
this.userDefinedTypes = userDefinedTypes;
this.replication = replication;
this.durableWrites = durableWrites;
this.hashCode = computeHashCode();
}
/**
* @return The value of the {@code name} attribute
*/
@Override
public String name() {
return name;
}
/**
* @return The value of the {@code tables} attribute
*/
@Override
public Set tables() {
return tables;
}
/**
* @return The value of the {@code userDefinedTypes} attribute
*/
@Override
public List userDefinedTypes() {
return userDefinedTypes;
}
/**
* @return The value of the {@code replication} attribute
*/
@Override
public Map replication() {
return replication;
}
/**
* @return The value of the {@code durableWrites} attribute
*/
@Override
public Optional durableWrites() {
return Optional.ofNullable(durableWrites);
}
/**
* Copy the current immutable object by setting a value for the {@link Keyspace#name() name} attribute.
* An equals check used to prevent copying of the same value by returning {@code this}.
* @param value A new value for name
* @return A modified copy of the {@code this} object
*/
public final ImmutableKeyspace withName(String value) {
String newValue = Objects.requireNonNull(value, "name");
if (this.name.equals(newValue)) return this;
return new ImmutableKeyspace(newValue, this.tables, this.userDefinedTypes, this.replication, this.durableWrites);
}
/**
* Copy the current immutable object with elements that replace the content of {@link Keyspace#tables() tables}.
* @param elements The elements to set
* @return A modified copy of {@code this} object
*/
public final ImmutableKeyspace withTables(Table... elements) {
Set newValue = createUnmodifiableSet(createSafeList(Arrays.asList(elements), true, false));
return new ImmutableKeyspace(this.name, newValue, this.userDefinedTypes, this.replication, this.durableWrites);
}
/**
* Copy the current immutable object with elements that replace the content of {@link Keyspace#tables() tables}.
* A shallow reference equality check is used to prevent copying of the same value by returning {@code this}.
* @param elements An iterable of tables elements to set
* @return A modified copy of {@code this} object
*/
public final ImmutableKeyspace withTables(Iterable elements) {
if (this.tables == elements) return this;
Set newValue = createUnmodifiableSet(createSafeList(elements, true, false));
return new ImmutableKeyspace(this.name, newValue, this.userDefinedTypes, this.replication, this.durableWrites);
}
/**
* Copy the current immutable object with elements that replace the content of {@link Keyspace#userDefinedTypes() userDefinedTypes}.
* @param elements The elements to set
* @return A modified copy of {@code this} object
*/
public final ImmutableKeyspace withUserDefinedTypes(UserDefinedType... elements) {
List newValue = createUnmodifiableList(false, createSafeList(Arrays.asList(elements), true, false));
return new ImmutableKeyspace(this.name, this.tables, newValue, this.replication, this.durableWrites);
}
/**
* Copy the current immutable object with elements that replace the content of {@link Keyspace#userDefinedTypes() userDefinedTypes}.
* A shallow reference equality check is used to prevent copying of the same value by returning {@code this}.
* @param elements An iterable of userDefinedTypes elements to set
* @return A modified copy of {@code this} object
*/
public final ImmutableKeyspace withUserDefinedTypes(Iterable elements) {
if (this.userDefinedTypes == elements) return this;
List newValue = createUnmodifiableList(false, createSafeList(elements, true, false));
return new ImmutableKeyspace(this.name, this.tables, newValue, this.replication, this.durableWrites);
}
/**
* Copy the current immutable object by replacing the {@link Keyspace#replication() replication} map with the specified map.
* Nulls are not permitted as keys or values.
* A shallow reference equality check is used to prevent copying of the same value by returning {@code this}.
* @param entries The entries to be added to the replication map
* @return A modified copy of {@code this} object
*/
public final ImmutableKeyspace withReplication(Map entries) {
if (this.replication == entries) return this;
Map newValue = createUnmodifiableMap(true, false, entries);
return new ImmutableKeyspace(this.name, this.tables, this.userDefinedTypes, newValue, this.durableWrites);
}
/**
* Copy the current immutable object by setting a present value for the optional {@link Keyspace#durableWrites() durableWrites} attribute.
* @param value The value for durableWrites
* @return A modified copy of {@code this} object
*/
public final ImmutableKeyspace withDurableWrites(boolean value) {
@Nullable Boolean newValue = value;
if (Objects.equals(this.durableWrites, newValue)) return this;
return new ImmutableKeyspace(this.name, this.tables, this.userDefinedTypes, this.replication, newValue);
}
/**
* Copy the current immutable object by setting an optional value for the {@link Keyspace#durableWrites() durableWrites} attribute.
* An equality check is used on inner nullable value to prevent copying of the same value by returning {@code this}.
* @param optional A value for durableWrites
* @return A modified copy of {@code this} object
*/
public final ImmutableKeyspace withDurableWrites(Optional optional) {
@Nullable Boolean value = optional.orElse(null);
if (Objects.equals(this.durableWrites, value)) return this;
return new ImmutableKeyspace(this.name, this.tables, this.userDefinedTypes, this.replication, value);
}
/**
* This instance is equal to all instances of {@code ImmutableKeyspace} that have equal attribute values.
* @return {@code true} if {@code this} is equal to {@code another} instance
*/
@Override
public boolean equals(@Nullable Object another) {
if (this == another) return true;
return another instanceof ImmutableKeyspace
&& equalTo((ImmutableKeyspace) another);
}
private boolean equalTo(ImmutableKeyspace another) {
if (hashCode != another.hashCode) return false;
return name.equals(another.name)
&& tables.equals(another.tables)
&& userDefinedTypes.equals(another.userDefinedTypes)
&& replication.equals(another.replication)
&& Objects.equals(durableWrites, another.durableWrites);
}
/**
* Returns a precomputed-on-construction hash code from attributes: {@code name}, {@code tables}, {@code userDefinedTypes}, {@code replication}, {@code durableWrites}.
* @return hashCode value
*/
@Override
public int hashCode() {
return hashCode;
}
private int computeHashCode() {
int h = 5381;
h += (h << 5) + name.hashCode();
h += (h << 5) + tables.hashCode();
h += (h << 5) + userDefinedTypes.hashCode();
h += (h << 5) + replication.hashCode();
h += (h << 5) + Objects.hashCode(durableWrites);
return h;
}
private transient volatile long lazyInitBitmap;
private static final long CQL_NAME_LAZY_INIT_BIT = 0x1L;
private transient String cqlName;
/**
* {@inheritDoc}
*
* Returns a lazily initialized value of the {@link Keyspace#cqlName() cqlName} attribute.
* Initialized once and only once and stored for subsequent access with proper synchronization.
* In case of any exception or error thrown by the lazy value initializer,
* the result will not be memoised (i.e. remembered) and on next call computation
* will be attempted again.
* @return A lazily initialized value of the {@code cqlName} attribute
*/
@Override
public String cqlName() {
if ((lazyInitBitmap & CQL_NAME_LAZY_INIT_BIT) == 0) {
synchronized (this) {
if ((lazyInitBitmap & CQL_NAME_LAZY_INIT_BIT) == 0) {
this.cqlName = Objects.requireNonNull(super.cqlName(), "cqlName");
lazyInitBitmap |= CQL_NAME_LAZY_INIT_BIT;
}
}
}
return cqlName;
}
private static final long TABLE_MAP_LAZY_INIT_BIT = 0x2L;
private transient Map tableMap;
/**
* {@inheritDoc}
*
* Returns a lazily initialized value of the {@link Keyspace#tableMap() tableMap} attribute.
* Initialized once and only once and stored for subsequent access with proper synchronization.
* In case of any exception or error thrown by the lazy value initializer,
* the result will not be memoised (i.e. remembered) and on next call computation
* will be attempted again.
* @return A lazily initialized value of the {@code tableMap} attribute
*/
@Override
Map tableMap() {
if ((lazyInitBitmap & TABLE_MAP_LAZY_INIT_BIT) == 0) {
synchronized (this) {
if ((lazyInitBitmap & TABLE_MAP_LAZY_INIT_BIT) == 0) {
this.tableMap = Objects.requireNonNull(super.tableMap(), "tableMap");
lazyInitBitmap |= TABLE_MAP_LAZY_INIT_BIT;
}
}
}
return tableMap;
}
private static final long USER_DEFINED_TYPE_MAP_LAZY_INIT_BIT = 0x4L;
private transient Map userDefinedTypeMap;
/**
* {@inheritDoc}
*
* Returns a lazily initialized value of the {@link Keyspace#userDefinedTypeMap() userDefinedTypeMap} attribute.
* Initialized once and only once and stored for subsequent access with proper synchronization.
* In case of any exception or error thrown by the lazy value initializer,
* the result will not be memoised (i.e. remembered) and on next call computation
* will be attempted again.
* @return A lazily initialized value of the {@code userDefinedTypeMap} attribute
*/
@Override
Map userDefinedTypeMap() {
if ((lazyInitBitmap & USER_DEFINED_TYPE_MAP_LAZY_INIT_BIT) == 0) {
synchronized (this) {
if ((lazyInitBitmap & USER_DEFINED_TYPE_MAP_LAZY_INIT_BIT) == 0) {
this.userDefinedTypeMap = Objects.requireNonNull(super.userDefinedTypeMap(), "userDefinedTypeMap");
lazyInitBitmap |= USER_DEFINED_TYPE_MAP_LAZY_INIT_BIT;
}
}
}
return userDefinedTypeMap;
}
private static final long MATERIALIZED_VIEW_MAP_LAZY_INIT_BIT = 0x8L;
private transient Map materializedViewMap;
/**
* {@inheritDoc}
*
* Returns a lazily initialized value of the {@link Keyspace#materializedViewMap() materializedViewMap} attribute.
* Initialized once and only once and stored for subsequent access with proper synchronization.
* In case of any exception or error thrown by the lazy value initializer,
* the result will not be memoised (i.e. remembered) and on next call computation
* will be attempted again.
* @return A lazily initialized value of the {@code materializedViewMap} attribute
*/
@Override
Map materializedViewMap() {
if ((lazyInitBitmap & MATERIALIZED_VIEW_MAP_LAZY_INIT_BIT) == 0) {
synchronized (this) {
if ((lazyInitBitmap & MATERIALIZED_VIEW_MAP_LAZY_INIT_BIT) == 0) {
this.materializedViewMap = Objects.requireNonNull(super.materializedViewMap(), "materializedViewMap");
lazyInitBitmap |= MATERIALIZED_VIEW_MAP_LAZY_INIT_BIT;
}
}
}
return materializedViewMap;
}
private static final long SECONDARY_INDEX_MAP_LAZY_INIT_BIT = 0x10L;
private transient Map secondaryIndexMap;
/**
* {@inheritDoc}
*
* Returns a lazily initialized value of the {@link Keyspace#secondaryIndexMap() secondaryIndexMap} attribute.
* Initialized once and only once and stored for subsequent access with proper synchronization.
* In case of any exception or error thrown by the lazy value initializer,
* the result will not be memoised (i.e. remembered) and on next call computation
* will be attempted again.
* @return A lazily initialized value of the {@code secondaryIndexMap} attribute
*/
@Override
Map secondaryIndexMap() {
if ((lazyInitBitmap & SECONDARY_INDEX_MAP_LAZY_INIT_BIT) == 0) {
synchronized (this) {
if ((lazyInitBitmap & SECONDARY_INDEX_MAP_LAZY_INIT_BIT) == 0) {
this.secondaryIndexMap = Objects.requireNonNull(super.secondaryIndexMap(), "secondaryIndexMap");
lazyInitBitmap |= SECONDARY_INDEX_MAP_LAZY_INIT_BIT;
}
}
}
return secondaryIndexMap;
}
private static final long REVERSE_INDEX_MAP_LAZY_INIT_BIT = 0x20L;
private transient Map reverseIndexMap;
/**
* {@inheritDoc}
*
* Returns a lazily initialized value of the {@link Keyspace#reverseIndexMap() reverseIndexMap} attribute.
* Initialized once and only once and stored for subsequent access with proper synchronization.
* In case of any exception or error thrown by the lazy value initializer,
* the result will not be memoised (i.e. remembered) and on next call computation
* will be attempted again.
* @return A lazily initialized value of the {@code reverseIndexMap} attribute
*/
@Override
Map reverseIndexMap() {
if ((lazyInitBitmap & REVERSE_INDEX_MAP_LAZY_INIT_BIT) == 0) {
synchronized (this) {
if ((lazyInitBitmap & REVERSE_INDEX_MAP_LAZY_INIT_BIT) == 0) {
this.reverseIndexMap = Objects.requireNonNull(super.reverseIndexMap(), "reverseIndexMap");
lazyInitBitmap |= REVERSE_INDEX_MAP_LAZY_INIT_BIT;
}
}
}
return reverseIndexMap;
}
/**
* Creates an immutable copy of a {@link Keyspace} value.
* Uses accessors to get values to initialize the new immutable instance.
* If an instance is already immutable, it is returned as is.
* @param instance The instance to copy
* @return A copied immutable Keyspace instance
*/
public static ImmutableKeyspace copyOf(Keyspace instance) {
if (instance instanceof ImmutableKeyspace) {
return (ImmutableKeyspace) instance;
}
return ImmutableKeyspace.builder()
.from(instance)
.build();
}
private static final long serialVersionUID = -337891773492616286L;
private Object readResolve() throws ObjectStreamException {
return new ImmutableKeyspace(this.name, this.tables, this.userDefinedTypes, this.replication, this.durableWrites);
}
/**
* Creates a builder for {@link ImmutableKeyspace ImmutableKeyspace}.
*
* ImmutableKeyspace.builder()
* .name(String) // required {@link Keyspace#name() name}
* .addTables|addAllTables(io.stargate.db.schema.Table) // {@link Keyspace#tables() tables} elements
* .addUserDefinedTypes|addAllUserDefinedTypes(io.stargate.db.schema.UserDefinedType) // {@link Keyspace#userDefinedTypes() userDefinedTypes} elements
* .putReplication|putAllReplication(String => String) // {@link Keyspace#replication() replication} mappings
* .durableWrites(Boolean) // optional {@link Keyspace#durableWrites() durableWrites}
* .build();
*
* @return A new ImmutableKeyspace builder
*/
public static ImmutableKeyspace.Builder builder() {
return new ImmutableKeyspace.Builder();
}
/**
* Builds instances of type {@link ImmutableKeyspace ImmutableKeyspace}.
* Initialize attributes and then invoke the {@link #build()} method to create an
* immutable instance.
* {@code Builder} is not thread-safe and generally should not be stored in a field or collection,
* but instead used immediately to create instances.
*/
@Generated(from = "Keyspace", generator = "Immutables")
@NotThreadSafe
public static final class Builder {
private static final long INIT_BIT_NAME = 0x1L;
private long initBits = 0x1L;
private @Nullable String name;
private List
tables = new ArrayList();
private List userDefinedTypes = new ArrayList();
private Map replication = new LinkedHashMap();
private @Nullable Boolean durableWrites;
private Builder() {
}
/**
* Fill a builder with attribute values from the provided {@code io.stargate.db.schema.SchemaEntity} instance.
* @param instance The instance from which to copy values
* @return {@code this} builder for use in a chained invocation
*/
public final Builder from(SchemaEntity instance) {
Objects.requireNonNull(instance, "instance");
from((Object) instance);
return this;
}
/**
* Fill a builder with attribute values from the provided {@code io.stargate.db.schema.Keyspace} instance.
* @param instance The instance from which to copy values
* @return {@code this} builder for use in a chained invocation
*/
public final Builder from(Keyspace instance) {
Objects.requireNonNull(instance, "instance");
from((Object) instance);
return this;
}
private void from(Object object) {
if (object instanceof SchemaEntity) {
SchemaEntity instance = (SchemaEntity) object;
name(instance.name());
}
if (object instanceof Keyspace) {
Keyspace instance = (Keyspace) object;
putAllReplication(instance.replication());
Optional durableWritesOptional = instance.durableWrites();
if (durableWritesOptional.isPresent()) {
durableWrites(durableWritesOptional);
}
addAllTables(instance.tables());
addAllUserDefinedTypes(instance.userDefinedTypes());
}
}
/**
* Initializes the value for the {@link Keyspace#name() name} attribute.
* @param name The value for name
* @return {@code this} builder for use in a chained invocation
*/
public final Builder name(String name) {
this.name = Objects.requireNonNull(name, "name");
initBits &= ~INIT_BIT_NAME;
return this;
}
/**
* Adds one element to {@link Keyspace#tables() tables} set.
* @param element A tables element
* @return {@code this} builder for use in a chained invocation
*/
public final Builder addTables(Table element) {
this.tables.add(Objects.requireNonNull(element, "tables element"));
return this;
}
/**
* Adds elements to {@link Keyspace#tables() tables} set.
* @param elements An array of tables elements
* @return {@code this} builder for use in a chained invocation
*/
public final Builder addTables(Table... elements) {
for (Table element : elements) {
this.tables.add(Objects.requireNonNull(element, "tables element"));
}
return this;
}
/**
* Sets or replaces all elements for {@link Keyspace#tables() tables} set.
* @param elements An iterable of tables elements
* @return {@code this} builder for use in a chained invocation
*/
public final Builder tables(Iterable elements) {
this.tables.clear();
return addAllTables(elements);
}
/**
* Adds elements to {@link Keyspace#tables() tables} set.
* @param elements An iterable of tables elements
* @return {@code this} builder for use in a chained invocation
*/
public final Builder addAllTables(Iterable elements) {
for (Table element : elements) {
this.tables.add(Objects.requireNonNull(element, "tables element"));
}
return this;
}
/**
* Adds one element to {@link Keyspace#userDefinedTypes() userDefinedTypes} list.
* @param element A userDefinedTypes element
* @return {@code this} builder for use in a chained invocation
*/
public final Builder addUserDefinedTypes(UserDefinedType element) {
this.userDefinedTypes.add(Objects.requireNonNull(element, "userDefinedTypes element"));
return this;
}
/**
* Adds elements to {@link Keyspace#userDefinedTypes() userDefinedTypes} list.
* @param elements An array of userDefinedTypes elements
* @return {@code this} builder for use in a chained invocation
*/
public final Builder addUserDefinedTypes(UserDefinedType... elements) {
for (UserDefinedType element : elements) {
this.userDefinedTypes.add(Objects.requireNonNull(element, "userDefinedTypes element"));
}
return this;
}
/**
* Sets or replaces all elements for {@link Keyspace#userDefinedTypes() userDefinedTypes} list.
* @param elements An iterable of userDefinedTypes elements
* @return {@code this} builder for use in a chained invocation
*/
public final Builder userDefinedTypes(Iterable elements) {
this.userDefinedTypes.clear();
return addAllUserDefinedTypes(elements);
}
/**
* Adds elements to {@link Keyspace#userDefinedTypes() userDefinedTypes} list.
* @param elements An iterable of userDefinedTypes elements
* @return {@code this} builder for use in a chained invocation
*/
public final Builder addAllUserDefinedTypes(Iterable elements) {
for (UserDefinedType element : elements) {
this.userDefinedTypes.add(Objects.requireNonNull(element, "userDefinedTypes element"));
}
return this;
}
/**
* Put one entry to the {@link Keyspace#replication() replication} map.
* @param key The key in the replication map
* @param value The associated value in the replication map
* @return {@code this} builder for use in a chained invocation
*/
public final Builder putReplication(String key, String value) {
this.replication.put(
Objects.requireNonNull(key, "replication key"),
Objects.requireNonNull(value, "replication value"));
return this;
}
/**
* Put one entry to the {@link Keyspace#replication() replication} map. Nulls are not permitted
* @param entry The key and value entry
* @return {@code this} builder for use in a chained invocation
*/
public final Builder putReplication(Map.Entry entry) {
String k = entry.getKey();
String v = entry.getValue();
this.replication.put(
Objects.requireNonNull(k, "replication key"),
Objects.requireNonNull(v, "replication value"));
return this;
}
/**
* Sets or replaces all mappings from the specified map as entries for the {@link Keyspace#replication() replication} map. Nulls are not permitted
* @param entries The entries that will be added to the replication map
* @return {@code this} builder for use in a chained invocation
*/
public final Builder replication(Map entries) {
this.replication.clear();
return putAllReplication(entries);
}
/**
* Put all mappings from the specified map as entries to {@link Keyspace#replication() replication} map. Nulls are not permitted
* @param entries The entries that will be added to the replication map
* @return {@code this} builder for use in a chained invocation
*/
public final Builder putAllReplication(Map entries) {
for (Map.Entry e : entries.entrySet()) {
String k = e.getKey();
String v = e.getValue();
this.replication.put(
Objects.requireNonNull(k, "replication key"),
Objects.requireNonNull(v, "replication value"));
}
return this;
}
/**
* Initializes the optional value {@link Keyspace#durableWrites() durableWrites} to durableWrites.
* @param durableWrites The value for durableWrites
* @return {@code this} builder for chained invocation
*/
public final Builder durableWrites(boolean durableWrites) {
this.durableWrites = durableWrites;
return this;
}
/**
* Initializes the optional value {@link Keyspace#durableWrites() durableWrites} to durableWrites.
* @param durableWrites The value for durableWrites
* @return {@code this} builder for use in a chained invocation
*/
public final Builder durableWrites(Optional durableWrites) {
this.durableWrites = durableWrites.orElse(null);
return this;
}
/**
* Builds a new {@link ImmutableKeyspace ImmutableKeyspace}.
* @return An immutable instance of Keyspace
* @throws java.lang.IllegalStateException if any required attributes are missing
*/
public ImmutableKeyspace build() {
if (initBits != 0) {
throw new IllegalStateException(formatRequiredAttributesMessage());
}
return new ImmutableKeyspace(
name,
createUnmodifiableSet(tables),
createUnmodifiableList(true, userDefinedTypes),
createUnmodifiableMap(false, false, replication),
durableWrites);
}
private String formatRequiredAttributesMessage() {
List attributes = new ArrayList<>();
if ((initBits & INIT_BIT_NAME) != 0) attributes.add("name");
return "Cannot build Keyspace, some of required attributes are not set " + attributes;
}
}
private static List createSafeList(Iterable iterable, boolean checkNulls, boolean skipNulls) {
ArrayList list;
if (iterable instanceof Collection) {
int size = ((Collection) iterable).size();
if (size == 0) return Collections.emptyList();
list = new ArrayList<>();
} else {
list = new ArrayList<>();
}
for (T element : iterable) {
if (skipNulls && element == null) continue;
if (checkNulls) Objects.requireNonNull(element, "element");
list.add(element);
}
return list;
}
private static List createUnmodifiableList(boolean clone, List list) {
switch(list.size()) {
case 0: return Collections.emptyList();
case 1: return Collections.singletonList(list.get(0));
default:
if (clone) {
return Collections.unmodifiableList(new ArrayList<>(list));
} else {
if (list instanceof ArrayList) {
((ArrayList) list).trimToSize();
}
return Collections.unmodifiableList(list);
}
}
}
/** Unmodifiable set constructed from list to avoid rehashing. */
private static Set createUnmodifiableSet(List list) {
switch(list.size()) {
case 0: return Collections.emptySet();
case 1: return Collections.singleton(list.get(0));
default:
Set set = new LinkedHashSet<>(list.size());
set.addAll(list);
return Collections.unmodifiableSet(set);
}
}
private static Map createUnmodifiableMap(boolean checkNulls, boolean skipNulls, Map map) {
switch (map.size()) {
case 0: return Collections.emptyMap();
case 1: {
Map.Entry e = map.entrySet().iterator().next();
K k = e.getKey();
V v = e.getValue();
if (checkNulls) {
Objects.requireNonNull(k, "key");
Objects.requireNonNull(v, "value");
}
if (skipNulls && (k == null || v == null)) {
return Collections.emptyMap();
}
return Collections.singletonMap(k, v);
}
default: {
Map linkedMap = new LinkedHashMap<>(map.size());
if (skipNulls || checkNulls) {
for (Map.Entry e : map.entrySet()) {
K k = e.getKey();
V v = e.getValue();
if (skipNulls) {
if (k == null || v == null) continue;
} else if (checkNulls) {
Objects.requireNonNull(k, "key");
Objects.requireNonNull(v, "value");
}
linkedMap.put(k, v);
}
} else {
linkedMap.putAll(map);
}
return Collections.unmodifiableMap(linkedMap);
}
}
}
}
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