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/* 
 * Licensed to Aduna under one or more contributor license agreements.  
 * See the NOTICE.txt file distributed with this work for additional 
 * information regarding copyright ownership. 
 *
 * Aduna licenses this file to you under the terms of the Aduna BSD 
 * License (the "License"); you may not use this file except in compliance 
 * with the License. See the LICENSE.txt file distributed with this work 
 * for the full License.
 *
 * 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.openrdf.rio.helpers;

import java.util.Iterator;

/**
 * Helper class for quickly iterating over a String and receiving each character
 * code point (taking care to handle surrogate pairs correctly).
 * 
 * @author Jeen Broekstra
 * @since 2.8.0
 * @see CodePointSequence
 */
public class CodePointIterator implements Iterator {

	private final String source;

	private int index = 0;

	public CodePointIterator(String source) {
		this.source = source;
	}

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

	@Override
	public Integer next() {
		int codePoint = source.codePointAt(index);
		index += Character.charCount(codePoint);
		return codePoint;
	}

	@Override
	public void remove() {
		throw new UnsupportedOperationException();
	}

}