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/*
* Copyright (C) 2012 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 com.google.common.annotations.GwtCompatible;
import com.google.common.base.Function;
import java.util.ListIterator;
/**
* An iterator that transforms a backing list iterator; for internal use. This
* avoids the object overhead of constructing a {@link Function} for internal
* methods.
*
* @author Louis Wasserman
*/
@GwtCompatible
abstract class TransformedListIterator<F, T> extends TransformedIterator<F, T>
implements ListIterator<T> {
TransformedListIterator(ListIterator<? extends F> backingIterator) {
super(backingIterator);
}
private ListIterator<? extends F> backingIterator() {
return Iterators.cast(backingIterator);
}
@Override
public final boolean hasPrevious() {
return backingIterator().hasPrevious();
}
@Override
public final T previous() {
return transform(backingIterator().previous());
}
@Override
public final int nextIndex() {
return backingIterator().nextIndex();
}
@Override
public final int previousIndex() {
return backingIterator().previousIndex();
}
@Override
public void set(T element) {
throw new UnsupportedOperationException();
}
@Override
public void add(T element) {
throw new UnsupportedOperationException();
}
}
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