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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 java.io.Serializable;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import javax.annotation.Nullable;
/**
* GWT emulated version of {@link ImmutableCollection}.
*
* @author Jesse Wilson
*/
@SuppressWarnings("serial") // we're overriding default serialization
public abstract class ImmutableCollection<E>
implements Collection<E>, Serializable {
static final ImmutableCollection<Object> EMPTY_IMMUTABLE_COLLECTION
= new ForwardingImmutableCollection<Object>(Collections.emptyList());
ImmutableCollection() {}
public abstract UnmodifiableIterator<E> iterator();
public Object[] toArray() {
Object[] newArray = new Object[size()];
return toArray(newArray);
}
public <T> T[] toArray(T[] other) {
int size = size();
if (other.length < size) {
other = ObjectArrays.newArray(other, size);
} else if (other.length > size) {
other[size] = null;
}
// Writes will produce ArrayStoreException when the toArray() doc requires.
Object[] otherAsObjectArray = other;
int index = 0;
for (E element : this) {
otherAsObjectArray[index++] = element;
}
return other;
}
public boolean contains(@Nullable Object object) {
if (object == null) {
return false;
}
for (E element : this) {
if (element.equals(object)) {
return true;
}
}
return false;
}
public boolean containsAll(Collection<?> targets) {
for (Object target : targets) {
if (!contains(target)) {
return false;
}
}
return true;
}
public boolean isEmpty() {
return size() == 0;
}
@Override public String toString() {
return Collections2.toStringImpl(this);
}
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 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());
}
}
static <E> ImmutableCollection<E> unsafeDelegate(Collection<E> delegate) {
return new ForwardingImmutableCollection<E>(delegate);
}
boolean isPartialView(){
return false;
}
abstract static class Builder<E> {
public abstract Builder<E> add(E element);
public Builder<E> add(E... elements) {
checkNotNull(elements); // for GWT
for (E element : elements) {
add(checkNotNull(element));
}
return this;
}
public Builder<E> addAll(Iterable<? extends E> elements) {
checkNotNull(elements); // for GWT
for (E element : elements) {
add(checkNotNull(element));
}
return this;
}
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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