/** * 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(); } }