com.google.common.collect.RegularImmutableSortedSet Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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/*
* Copyright (C) 2009 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.collect;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.Spliterator;
import java.util.function.Consumer;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* An immutable sorted set with one or more elements. TODO(jlevy): Consider separate class for a
* single-element sorted set.
*
* @author Jared Levy
* @author Louis Wasserman
*/
@GwtCompatible(serializable = true, emulated = true)
@SuppressWarnings({"serial", "rawtypes"})
@ElementTypesAreNonnullByDefault
final class RegularImmutableSortedSet extends ImmutableSortedSet {
static final RegularImmutableSortedSet NATURAL_EMPTY_SET =
new RegularImmutableSortedSet<>(ImmutableList.of(), Ordering.natural());
private final transient ImmutableList elements;
RegularImmutableSortedSet(ImmutableList elements, Comparator comparator) {
super(comparator);
this.elements = elements;
}
@Override
@CheckForNull
Object[] internalArray() {
return elements.internalArray();
}
@Override
int internalArrayStart() {
return elements.internalArrayStart();
}
@Override
int internalArrayEnd() {
return elements.internalArrayEnd();
}
@Override
public UnmodifiableIterator iterator() {
return elements.iterator();
}
@GwtIncompatible // NavigableSet
@Override
public UnmodifiableIterator descendingIterator() {
return elements.reverse().iterator();
}
@Override
public Spliterator spliterator() {
return asList().spliterator();
}
@Override
public void forEach(Consumer action) {
elements.forEach(action);
}
@Override
public int size() {
return elements.size();
}
@Override
public boolean contains(@CheckForNull Object o) {
try {
return o != null && unsafeBinarySearch(o) >= 0;
} catch (ClassCastException e) {
return false;
}
}
@Override
public boolean containsAll(Collection targets) {
// TODO(jlevy): For optimal performance, use a binary search when
// targets.size() < size() / log(size())
// TODO(kevinb): see if we can share code with OrderedIterator after it
// graduates from labs.
if (targets instanceof Multiset) {
targets = ((Multiset) targets).elementSet();
}
if (!SortedIterables.hasSameComparator(comparator(), targets) || (targets.size() <= 1)) {
return super.containsAll(targets);
}
/*
* If targets is a sorted set with the same comparator, containsAll can run
* in O(n) time stepping through the two collections.
*/
Iterator thisIterator = iterator();
Iterator thatIterator = targets.iterator();
// known nonempty since we checked targets.size() > 1
if (!thisIterator.hasNext()) {
return false;
}
Object target = thatIterator.next();
E current = thisIterator.next();
try {
while (true) {
int cmp = unsafeCompare(current, target);
if (cmp < 0) {
if (!thisIterator.hasNext()) {
return false;
}
current = thisIterator.next();
} else if (cmp == 0) {
if (!thatIterator.hasNext()) {
return true;
}
target = thatIterator.next();
} else if (cmp > 0) {
return false;
}
}
} catch (NullPointerException | ClassCastException e) {
return false;
}
}
private int unsafeBinarySearch(Object key) throws ClassCastException {
return Collections.binarySearch(elements, key, unsafeComparator());
}
@Override
boolean isPartialView() {
return elements.isPartialView();
}
@Override
int copyIntoArray(@Nullable Object[] dst, int offset) {
return elements.copyIntoArray(dst, offset);
}
@Override
public boolean equals(@CheckForNull Object object) {
if (object == this) {
return true;
}
if (!(object instanceof Set)) {
return false;
}
Set that = (Set) object;
if (size() != that.size()) {
return false;
} else if (isEmpty()) {
return true;
}
if (SortedIterables.hasSameComparator(comparator, that)) {
Iterator otherIterator = that.iterator();
try {
Iterator iterator = iterator();
while (iterator.hasNext()) {
Object element = iterator.next();
Object otherElement = otherIterator.next();
if (otherElement == null || unsafeCompare(element, otherElement) != 0) {
return false;
}
}
return true;
} catch (ClassCastException e) {
return false;
} catch (NoSuchElementException e) {
return false; // concurrent change to other set
}
}
return containsAll(that);
}
@Override
public E first() {
if (isEmpty()) {
throw new NoSuchElementException();
}
return elements.get(0);
}
@Override
public E last() {
if (isEmpty()) {
throw new NoSuchElementException();
}
return elements.get(size() - 1);
}
@Override
@CheckForNull
public E lower(E element) {
int index = headIndex(element, false) - 1;
return (index == -1) ? null : elements.get(index);
}
@Override
@CheckForNull
public E floor(E element) {
int index = headIndex(element, true) - 1;
return (index == -1) ? null : elements.get(index);
}
@Override
@CheckForNull
public E ceiling(E element) {
int index = tailIndex(element, true);
return (index == size()) ? null : elements.get(index);
}
@Override
@CheckForNull
public E higher(E element) {
int index = tailIndex(element, false);
return (index == size()) ? null : elements.get(index);
}
@Override
ImmutableSortedSet headSetImpl(E toElement, boolean inclusive) {
return getSubSet(0, headIndex(toElement, inclusive));
}
int headIndex(E toElement, boolean inclusive) {
int index = Collections.binarySearch(elements, checkNotNull(toElement), comparator());
if (index >= 0) {
return inclusive ? index + 1 : index;
} else {
return ~index;
}
}
@Override
ImmutableSortedSet subSetImpl(
E fromElement, boolean fromInclusive, E toElement, boolean toInclusive) {
return tailSetImpl(fromElement, fromInclusive).headSetImpl(toElement, toInclusive);
}
@Override
ImmutableSortedSet tailSetImpl(E fromElement, boolean inclusive) {
return getSubSet(tailIndex(fromElement, inclusive), size());
}
int tailIndex(E fromElement, boolean inclusive) {
int index = Collections.binarySearch(elements, checkNotNull(fromElement), comparator());
if (index >= 0) {
return inclusive ? index : index + 1;
} else {
return ~index;
}
}
// Pretend the comparator can compare anything. If it turns out it can't
// compare two elements, it'll throw a CCE. Only methods that are specified to
// throw CCE should call this.
@SuppressWarnings("unchecked")
Comparator