/*
* Copyright (C) 2010 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 java.util.List;
import javax.annotation.Nullable;
/**
* A transforming wrapper around an ImmutableList. For internal use only. {@link
* #transform(Object)} must be functional.
*
* @author Louis Wasserman
*/
@GwtCompatible
@SuppressWarnings("serial") // uses writeReplace(), not default serialization
abstract class TransformedImmutableList<D, E> extends ImmutableList<E> {
private class TransformedView extends TransformedImmutableList<D, E> {
TransformedView(ImmutableList<D> backingList) {
super(backingList);
}
@Override E transform(D d) {
return TransformedImmutableList.this.transform(d);
}
}
private transient final ImmutableList<D> backingList;
TransformedImmutableList(ImmutableList<D> backingList) {
this.backingList = checkNotNull(backingList);
}
abstract E transform(D d);
@Override public int indexOf(@Nullable Object object) {
if (object == null) {
return -1;
}
for (int i = 0; i < size(); i++) {
if (get(i).equals(object)) {
return i;
}
}
return -1;
}
@Override public int lastIndexOf(@Nullable Object object) {
if (object == null) {
return -1;
}
for (int i = size() - 1; i >= 0; i--) {
if (get(i).equals(object)) {
return i;
}
}
return -1;
}
@Override public E get(int index) {
return transform(backingList.get(index));
}
@Override public UnmodifiableListIterator<E> listIterator(int index) {
return new AbstractIndexedListIterator<E>(size(), index) {
@Override protected E get(int index) {
return TransformedImmutableList.this.get(index);
}
};
}
@Override public int size() {
return backingList.size();
}
@Override public ImmutableList<E> subList(int fromIndex, int toIndex) {
return new TransformedView(backingList.subList(fromIndex, toIndex));
}
@Override public boolean equals(@Nullable Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof List) {
List<?> list = (List<?>) obj;
return size() == list.size()
&& Iterators.elementsEqual(iterator(), list.iterator());
}
return false;
}
@Override public int hashCode() {
int hashCode = 1;
for (E e : this) {
hashCode = 31 * hashCode + (e == null ? 0 : e.hashCode());
}
return hashCode;
}
@Override public Object[] toArray() {
return ObjectArrays.toArrayImpl(this);
}
@Override public <T> T[] toArray(T[] array) {
return ObjectArrays.toArrayImpl(this, array);
}
@Override boolean isPartialView() {
return true;
}
}
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