| package org.apache.maven.shared.dependency.tree; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.NoSuchElementException; |
| import java.util.Stack; |
| |
| /** |
| * {@link Iterator} for {@link DependencyNode} implementing a preoder traversal. |
| * |
| * @author <a href="mailto:carlos@apache.org">Carlos Sanchez</a> |
| * @version $Id$ |
| */ |
| public class DependencyTreePreorderIterator |
| implements Iterator<DependencyNode> |
| { |
| private Stack<DependencyNode> nodesToProcess = new Stack<DependencyNode>(); |
| |
| public DependencyTreePreorderIterator( DependencyNode rootNode ) |
| { |
| nodesToProcess.push( rootNode ); |
| } |
| |
| public boolean hasNext() |
| { |
| return !nodesToProcess.isEmpty(); |
| } |
| |
| public DependencyNode next() |
| { |
| if ( !hasNext() ) |
| { |
| throw new NoSuchElementException(); |
| } |
| DependencyNode currentNode = nodesToProcess.pop(); |
| List<DependencyNode> children = currentNode.getChildren(); |
| if ( children != null ) |
| { |
| for ( int i = children.size() - 1; i >= 0; i-- ) |
| { |
| nodesToProcess.push( children.get( i ) ); |
| } |
| } |
| return currentNode; |
| } |
| |
| /** |
| * @throws UnsupportedOperationException |
| */ |
| public void remove() |
| { |
| throw new UnsupportedOperationException(); |
| } |
| } |