com.google.common.collect.TransformedIterator Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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 static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.GwtCompatible;
import java.util.Iterator;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* An iterator that transforms a backing iterator; for internal use. This avoids the object overhead
* of constructing a {@link com.google.common.base.Function Function} for internal methods.
*
* @author Louis Wasserman
*/
@GwtCompatible
@ElementTypesAreNonnullByDefault
abstract class TransformedIterator
implements Iterator {
final Iterator backingIterator;
TransformedIterator(Iterator backingIterator) {
this.backingIterator = checkNotNull(backingIterator);
}
@ParametricNullness
abstract T transform(@ParametricNullness F from);
@Override
public final boolean hasNext() {
return backingIterator.hasNext();
}
@Override
@ParametricNullness
public final T next() {
return transform(backingIterator.next());
}
@Override
public final void remove() {
backingIterator.remove();
}
}