/**
* Copyright (C) 2009-2011 the original author or authors.
* See the notice.md file distributed with this work for additional
* information regarding copyright ownership.
*
* 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.fusesource.restygwt.rebind.util;
import java.util.Iterator;
/**
* An iterator that returns the first time, the first value, and after it always the returns the next value.
* Useful for scenarios that have an <code>if (first) { first = true; ... }</code> inside a loop approach.
*
* @author <a href="mailto:bogdan.mustiata@gmail.com">Bogdan Mustiata</a>
* @param <T>
*/
public class OnceFirstIterator<T> implements Iterator<T> {
private T firstValue;
private T nextValue;
private boolean firstReturned;
public OnceFirstIterator(T firstValue, T nextValue) {
this.firstValue = firstValue;
this.nextValue = nextValue;
}
@Override
public boolean hasNext() {
return true;
}
@Override
public T next() {
if (firstReturned) {
return nextValue;
}
firstReturned = true;
return firstValue;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}