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/*
* Copyright (C) 2008 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.errorprone.annotations.CanIgnoreReturnValue;
import java.io.Serializable;
import java.util.AbstractCollection;
import java.util.Collection;
import java.util.Iterator;
import java.util.Spliterator;
import java.util.function.Predicate;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* GWT emulated version of {@link ImmutableCollection}.
*
* @author Jesse Wilson
*/
@SuppressWarnings("serial") // we're overriding default serialization
public abstract class ImmutableCollection<E> extends AbstractCollection<E> implements Serializable {
static final int SPLITERATOR_CHARACTERISTICS =
Spliterator.IMMUTABLE | Spliterator.NONNULL | Spliterator.ORDERED;
ImmutableCollection() {}
public abstract UnmodifiableIterator<E> iterator();
public boolean contains(@Nullable Object object) {
return object != null && super.contains(object);
}
public final boolean add(E e) {
throw new UnsupportedOperationException();
}
public final boolean remove(Object object) {
throw new UnsupportedOperationException();
}
public final boolean addAll(Collection<? extends E> newElements) {
throw new UnsupportedOperationException();
}
public final boolean removeAll(Collection<?> oldElements) {
throw new UnsupportedOperationException();
}
public final boolean removeIf(Predicate<? super E> predicate) {
throw new UnsupportedOperationException();
}
public final boolean retainAll(Collection<?> elementsToKeep) {
throw new UnsupportedOperationException();
}
public final void clear() {
throw new UnsupportedOperationException();
}
private transient ImmutableList<E> asList;
public ImmutableList<E> asList() {
ImmutableList<E> list = asList;
return (list == null) ? (asList = createAsList()) : list;
}
ImmutableList<E> createAsList() {
switch (size()) {
case 0:
return ImmutableList.of();
case 1:
return ImmutableList.of(iterator().next());
default:
return new RegularImmutableAsList<E>(this, toArray());
}
}
/** If this collection is backed by an array of its elements in insertion order, returns it. */
Object @Nullable [] internalArray() {
return null;
}
/**
* If this collection is backed by an array of its elements in insertion order, returns the offset
* where this collection's elements start.
*/
int internalArrayStart() {
throw new UnsupportedOperationException();
}
/**
* If this collection is backed by an array of its elements in insertion order, returns the offset
* where this collection's elements end.
*/
int internalArrayEnd() {
throw new UnsupportedOperationException();
}
static <E> ImmutableCollection<E> unsafeDelegate(Collection<E> delegate) {
return new ForwardingImmutableCollection<E>(delegate);
}
boolean isPartialView() {
return false;
}
/** GWT emulated version of {@link ImmutableCollection.Builder}. */
public abstract static class Builder<E> {
Builder() {}
static int expandedCapacity(int oldCapacity, int minCapacity) {
if (minCapacity < 0) {
throw new AssertionError("cannot store more than MAX_VALUE elements");
}
// careful of overflow!
int newCapacity = oldCapacity + (oldCapacity >> 1) + 1;
if (newCapacity < minCapacity) {
newCapacity = Integer.highestOneBit(minCapacity - 1) << 1;
}
if (newCapacity < 0) {
newCapacity = Integer.MAX_VALUE;
// guaranteed to be >= newCapacity
}
return newCapacity;
}
@CanIgnoreReturnValue
public abstract Builder<E> add(E element);
@CanIgnoreReturnValue
public Builder<E> add(E... elements) {
checkNotNull(elements); // for GWT
for (E element : elements) {
add(checkNotNull(element));
}
return this;
}
@CanIgnoreReturnValue
public Builder<E> addAll(Iterable<? extends E> elements) {
checkNotNull(elements); // for GWT
for (E element : elements) {
add(checkNotNull(element));
}
return this;
}
@CanIgnoreReturnValue
public Builder<E> addAll(Iterator<? extends E> elements) {
checkNotNull(elements); // for GWT
while (elements.hasNext()) {
add(checkNotNull(elements.next()));
}
return this;
}
public abstract ImmutableCollection<E> build();
}
}
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