org.d2ab.iterator.chars.RepeatingCharIterator Maven / Gradle / Ivy
/*
* Copyright 2016 Daniel Skogquist Åborg
*
* 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.d2ab.iterator.chars;
import org.d2ab.collection.chars.CharIterable;
import java.util.NoSuchElementException;
/**
* An {@link CharIterator} that cycles the values of an {@link CharIterable} forever. This class repeatedly calls
* {@link CharIterable#iterator()} to receive new values when the iterator ends, so it's possible to cause this
* {@link CharIterator} to terminate by providing an empty {@link CharIterator}. If the {@link CharIterable} never
* returns an empty {@link CharIterator}, this {@link CharIterator} will never terminate.
*/
public class RepeatingCharIterator extends DelegatingUnaryCharIterator {
private final CharIterable iterable;
private int times;
public RepeatingCharIterator(CharIterable iterable, int times) {
super(CharIterator.EMPTY);
this.iterable = iterable;
this.times = times;
}
@Override
public boolean hasNext() {
if (!iterator.hasNext() && times != 0) {
if (times > 0)
times--;
iterator = iterable.iterator();
}
return iterator.hasNext();
}
@Override
public char nextChar() {
if (!hasNext())
throw new NoSuchElementException();
return iterator.nextChar();
}
}