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/*
* 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 extends ImmutableList {
private class TransformedView extends TransformedImmutableList {
TransformedView(ImmutableList backingList) {
super(backingList);
}
@Override E transform(D d) {
return TransformedImmutableList.this.transform(d);
}
}
private transient final ImmutableList backingList;
TransformedImmutableList(ImmutableList backingList) {
this.backingList = checkNotNull(backingList);
}
abstract E transform(D d);
@Override public E get(int index) {
return transform(backingList.get(index));
}
@Override public int size() {
return backingList.size();
}
@Override public ImmutableList 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() {
return Lists.hashCodeImpl(this);
}
@Override boolean isPartialView() {
return true;
}
}