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A lightweight alternative to Java 8 sequential Stream

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/*
 * 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 java.util.NoSuchElementException;

/**
 * A {@link CharIterator} over a {@link CharSequence}.
 */
public class CharSequenceCharIterator implements CharIterator {
	private final CharSequence csq;
	private int index;

	public CharSequenceCharIterator(CharSequence csq) {
		this.csq = csq;
	}

	@Override
	public boolean hasNext() {
		return index < csq.length();
	}

	@Override
	public char nextChar() {
		if (!hasNext())
			throw new NoSuchElementException();

		return csq.charAt(index++);
	}
}