/*
 * Copyright (c) 2021 Goldman Sachs and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v. 1.0 which accompany this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 */

package org.eclipse.collections.impl.bag.immutable;

import java.io.Serializable;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Objects;
import java.util.Optional;

import org.eclipse.collections.api.bag.Bag;
import org.eclipse.collections.api.bag.ImmutableBag;
import org.eclipse.collections.api.bag.MutableBag;
import org.eclipse.collections.api.block.function.Function;
import org.eclipse.collections.api.block.function.Function0;
import org.eclipse.collections.api.block.function.Function2;
import org.eclipse.collections.api.block.function.primitive.ObjectIntToObjectFunction;
import org.eclipse.collections.api.block.predicate.Predicate;
import org.eclipse.collections.api.block.predicate.Predicate2;
import org.eclipse.collections.api.block.predicate.primitive.IntPredicate;
import org.eclipse.collections.api.block.predicate.primitive.ObjectIntPredicate;
import org.eclipse.collections.api.block.procedure.Procedure;
import org.eclipse.collections.api.block.procedure.Procedure2;
import org.eclipse.collections.api.block.procedure.primitive.ObjectIntProcedure;
import org.eclipse.collections.api.factory.Bags;
import org.eclipse.collections.api.factory.Sets;
import org.eclipse.collections.api.map.MutableMap;
import org.eclipse.collections.api.multimap.MutableMultimap;
import org.eclipse.collections.api.multimap.bag.ImmutableBagMultimap;
import org.eclipse.collections.api.ordered.OrderedIterable;
import org.eclipse.collections.api.set.ImmutableSet;
import org.eclipse.collections.api.tuple.Pair;
import org.eclipse.collections.impl.bag.mutable.HashBag;
import org.eclipse.collections.impl.block.factory.Predicates;
import org.eclipse.collections.impl.block.procedure.MultimapEachPutProcedure;
import org.eclipse.collections.impl.map.mutable.UnifiedMap;
import org.eclipse.collections.impl.multimap.bag.HashBagMultimap;
import org.eclipse.collections.impl.tuple.Tuples;
import org.eclipse.collections.impl.utility.ArrayIterate;
import org.eclipse.collections.impl.utility.Iterate;

Since:1.0
/** * @since 1.0 */
final class ImmutableSingletonBag<T> extends AbstractImmutableBag<T> implements Serializable { private static final long serialVersionUID = 1L; private final T value; ImmutableSingletonBag(T object) { this.value = object; } @Override public boolean allSatisfy(Predicate<? super T> predicate) { return predicate.accept(this.value); } @Override public boolean noneSatisfy(Predicate<? super T> predicate) { return !predicate.accept(this.value); } @Override public <IV> IV injectInto(IV injectedValue, Function2<? super IV, ? super T, ? extends IV> function) { return function.value(injectedValue, this.value); } @Override public T min(Comparator<? super T> comparator) { return this.value; } @Override public T max(Comparator<? super T> comparator) { return this.value; } @Override public T min() { return this.value; } @Override public T max() { return this.value; } @Override public <V extends Comparable<? super V>> T minBy(Function<? super T, ? extends V> function) { return this.value; } @Override public <V extends Comparable<? super V>> T maxBy(Function<? super T, ? extends V> function) { return this.value; } @Override public ImmutableBag<T> newWith(T element) { return Bags.immutable.with(this.value, element); } @Override public ImmutableBag<T> newWithout(T element) { return this.emptyIfMatchesOrThis(Predicates.equal(element)); } private ImmutableBag<T> emptyIfMatchesOrThis(Predicate<Object> predicate) { return predicate.accept(this.value) ? Bags.immutable.empty() : this; } @Override public ImmutableBag<T> newWithAll(Iterable<? extends T> elements) { MutableBag<T> bag = HashBag.newBag(elements); return bag.with(this.value).toImmutable(); } @Override public ImmutableBag<T> newWithoutAll(Iterable<? extends T> elements) { return this.emptyIfMatchesOrThis(Predicates.in(elements)); } @Override public int size() { return 1; } @Override public boolean isEmpty() { return false; } @Override public boolean notEmpty() { return true; } @Override public T getFirst() { return this.value; } @Override public T getLast() { return this.value; } @Override public T getOnly() { return this.value; } @Override public boolean contains(Object object) { return Objects.equals(this.value, object); } @Override public boolean containsAllIterable(Iterable<?> source) { return Iterate.allSatisfy(source, Predicates.equal(this.value)); } @Override public boolean containsAllArguments(Object... elements) { return ArrayIterate.allSatisfy(elements, Predicates.equal(this.value)); } @Override public ImmutableBag<T> selectByOccurrences(IntPredicate predicate) { return predicate.accept(1) ? this : Bags.immutable.empty(); } @Override public ImmutableBag<T> select(Predicate<? super T> predicate) { return predicate.accept(this.value) ? this : Bags.immutable.empty(); } @Override public <R extends Collection<T>> R select(Predicate<? super T> predicate, R target) { if (predicate.accept(this.value)) { target.add(this.value); } return target; } @Override public <P, R extends Collection<T>> R selectWith( Predicate2<? super T, ? super P> predicate, P parameter, R target) { if (predicate.accept(this.value, parameter)) { target.add(this.value); } return target; } @Override public ImmutableBag<T> reject(Predicate<? super T> predicate) { return predicate.accept(this.value) ? Bags.immutable.empty() : this; } @Override public <R extends Collection<T>> R reject(Predicate<? super T> predicate, R target) { if (!predicate.accept(this.value)) { target.add(this.value); } return target; } @Override public <P, R extends Collection<T>> R rejectWith( Predicate2<? super T, ? super P> predicate, P parameter, R target) { if (!predicate.accept(this.value, parameter)) { target.add(this.value); } return target; } @Override public <S> ImmutableBag<S> selectInstancesOf(Class<S> clazz) { return clazz.isInstance(this.value) ? (ImmutableBag<S>) this : Bags.immutable.empty(); } @Override public <V> ImmutableBag<V> collect(Function<? super T, ? extends V> function) { return Bags.immutable.with(function.valueOf(this.value)); } @Override public <V> ImmutableBag<V> collectIf( Predicate<? super T> predicate, Function<? super T, ? extends V> function) { return predicate.accept(this.value) ? Bags.immutable.with(function.valueOf(this.value)) : Bags.immutable.empty(); } @Override public <V, R extends Collection<V>> R collectIf( Predicate<? super T> predicate, Function<? super T, ? extends V> function, R target) { if (predicate.accept(this.value)) { target.add(function.valueOf(this.value)); } return target; } @Override public <V> ImmutableBag<V> flatCollect(Function<? super T, ? extends Iterable<V>> function) { return this.flatCollect(function, HashBag.newBag()).toImmutable(); } @Override public <V, R extends Collection<V>> R flatCollect( Function<? super T, ? extends Iterable<V>> function, R target) { Iterate.addAllTo(function.valueOf(this.value), target); return target; } @Override public T detect(Predicate<? super T> predicate) { return predicate.accept(this.value) ? this.value : null; } @Override public Optional<T> detectOptional(Predicate<? super T> predicate) { return predicate.accept(this.value) ? Optional.of(this.value) : Optional.empty(); } @Override public T detectIfNone(Predicate<? super T> predicate, Function0<? extends T> function) { return predicate.accept(this.value) ? this.value : function.value(); } @Override public int count(Predicate<? super T> predicate) { return predicate.accept(this.value) ? 1 : 0; } @Override public boolean anySatisfy(Predicate<? super T> predicate) { return predicate.accept(this.value); } @Override public <V> ImmutableBagMultimap<V, T> groupBy(Function<? super T, ? extends V> function) { return this.groupBy(function, HashBagMultimap.<V, T>newMultimap()).toImmutable(); } @Override public <V, R extends MutableMultimap<V, T>> R groupBy(Function<? super T, ? extends V> function, R target) { target.putAll(function.valueOf(this.value), this); return target; } @Override public <V> ImmutableBagMultimap<V, T> groupByEach(Function<? super T, ? extends Iterable<V>> function) { return this.groupByEach(function, HashBagMultimap.newMultimap()).toImmutable(); } @Override public <V, R extends MutableMultimap<V, T>> R groupByEach(Function<? super T, ? extends Iterable<V>> function, R target) { this.forEach(MultimapEachPutProcedure.on(target, function)); return target; } @Override public int sizeDistinct() { return 1; } @Override public int occurrencesOf(Object item) { return Objects.equals(this.value, item) ? 1 : 0; } @Override public void forEachWithOccurrences(ObjectIntProcedure<? super T> objectIntProcedure) { objectIntProcedure.value(this.value, 1); } @Override public boolean anySatisfyWithOccurrences(ObjectIntPredicate<? super T> predicate) { return predicate.accept(this.value, 1); } @Override public boolean allSatisfyWithOccurrences(ObjectIntPredicate<? super T> predicate) { return predicate.accept(this.value, 1); } @Override public boolean noneSatisfyWithOccurrences(ObjectIntPredicate<? super T> predicate) { return !predicate.accept(this.value, 1); } @Override public T detectWithOccurrences(ObjectIntPredicate<? super T> predicate) { return predicate.accept(this.value, 1) ? this.value : null; } @Override public <V, R extends Collection<V>> R collectWithOccurrences(ObjectIntToObjectFunction<? super T, ? extends V> function, R target) { target.add(function.valueOf(this.value, 1)); return target; } @Override public MutableMap<T, Integer> toMapOfItemToCount() { return UnifiedMap.newWithKeysValues(this.value, 1); } @Override public ImmutableBag<T> toImmutable() { return this; } @Override public void each(Procedure<? super T> procedure) { procedure.value(this.value); } @Override public void forEachWithIndex(ObjectIntProcedure<? super T> objectIntProcedure) { objectIntProcedure.value(this.value, 0); } @Override public <P> void forEachWith(Procedure2<? super T, ? super P> procedure, P parameter) { procedure.value(this.value, parameter); }
Deprecated:in 6.0. Use OrderedIterable.zip(Iterable) instead.
/** * @deprecated in 6.0. Use {@link OrderedIterable#zip(Iterable)} instead. */
@Override @Deprecated public <S> ImmutableBag<Pair<T, S>> zip(Iterable<S> that) { Iterator<S> iterator = that.iterator(); if (!iterator.hasNext()) { return Bags.immutable.empty(); } return Bags.immutable.with(Tuples.pair(this.value, iterator.next())); }
Deprecated:in 6.0. Use OrderedIterable.zipWithIndex() instead.
/** * @deprecated in 6.0. Use {@link OrderedIterable#zipWithIndex()} instead. */
@Override @Deprecated public ImmutableSet<Pair<T, Integer>> zipWithIndex() { return Sets.immutable.with(Tuples.pair(this.value, 0)); } @Override public Iterator<T> iterator() { return new SingletonIterator(); } private class SingletonIterator implements Iterator<T> { private boolean next = true; @Override public boolean hasNext() { return this.next; } @Override public T next() { if (this.next) { this.next = false; return ImmutableSingletonBag.this.value; } throw new NoSuchElementException("i=" + this.next); } @Override public void remove() { throw new UnsupportedOperationException("Cannot remove from an ImmutableBag"); } } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (!(obj instanceof Bag)) { return false; } Bag<?> bag = (Bag<?>) obj; if (this.size() != bag.size()) { return false; } return this.occurrencesOf(this.value) == bag.occurrencesOf(this.value); } @Override public String toString() { return '[' + this.makeString() + ']'; } @Override public int hashCode() { return (this.value == null ? 0 : this.value.hashCode()) ^ 1; } private Object writeReplace() { return new ImmutableBagSerializationProxy<>(this); } @Override public ImmutableSet<T> selectUnique() { return Sets.immutable.of(this.value); } }