org.docx4j.com.google.common.collect.TransformedIterator Maven / Gradle / Ivy
/*
* 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 org.docx4j.com.google.common.collect;
import static org.docx4j.com.google.common.base.Preconditions.checkNotNull;
import java.util.Iterator;
import org.docx4j.com.google.common.annotations.GwtCompatible;
/**
* An iterator that transforms a backing iterator; for internal use. This avoids the object overhead
* of constructing a {@link org.docx4j.com.google.common.base.Function Function} for internal methods.
*
* @author Louis Wasserman
*/
@GwtCompatible
abstract class TransformedIterator implements Iterator {
final Iterator backingIterator;
TransformedIterator(Iterator backingIterator) {
this.backingIterator = checkNotNull(backingIterator);
}
abstract T transform(F from);
@Override
public final boolean hasNext() {
return backingIterator.hasNext();
}
@Override
public final T next() {
return transform(backingIterator.next());
}
@Override
public final void remove() {
backingIterator.remove();
}
}