001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel; 018 019import java.util.List; 020 021/** 022 * Implementations support navigating a graph where you can traverse forward and each next 023 * returns a {@link List} of outputs of type <tt>T</tt> that can contain <tt>0..n</tt> nodes. 024 * 025 * @version 026 */ 027public interface Navigate<T> { 028 029 /** 030 * Next group of outputs 031 * <p/> 032 * Important only invoke this once, as this method do not carry state, and is not intended to be used in a while loop, 033 * but used by a if statement instead. 034 * 035 * @return next group or <tt>null</tt> if no more outputs 036 */ 037 List<T> next(); 038 039 /** 040 * Are there more outputs? 041 * <p/> 042 * Important only invoke this once, as this method do not carry state, and is not intended to be used in a while loop, 043 * but used by a if statement instead. 044 * 045 * @return <tt>true</tt> if more outputs 046 */ 047 boolean hasNext(); 048 049}