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/*
* Copyright 2024, Google LLC
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* Neither the name of Google LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.android.tools.smali.util;
import java.util.Iterator;
import java.util.function.Function;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* An iterator that will return the results of applying {@code transformFunction} to each element of
* {@code backingIterator}.
* <p>
* The returned iterator supports {@code remove()} if {@code backingIterator} does.
*/
public class TransformedIterator<F extends @Nullable Object, T extends @Nullable Object>
implements Iterator<T> {
final Iterator<? extends F> backingIterator;
final Function<F, T> transformFunction;
public TransformedIterator(Iterator<? extends F> backingIterator,
Function<F, T> transformFunction) {
this.backingIterator = backingIterator;
this.transformFunction = transformFunction;
}
@Override
public final boolean hasNext() {
return backingIterator.hasNext();
}
@Override
public final T next() {
return transformFunction.apply(backingIterator.next());
}
@Override
public final void remove() {
backingIterator.remove();
}
}
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