| /* |
| * 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. |
| */ |
| package org.apache.maven.shared.dependency.graph.filter; |
| |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.maven.shared.dependency.graph.DependencyNode; |
| |
| /** |
| * A dependency node filter than only accepts nodes that are ancestors of, or equal to, a given list of nodes. |
| * |
| * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a> |
| * @version $Id$ |
| * @since 1.1 |
| */ |
| public class AncestorOrSelfDependencyNodeFilter implements DependencyNodeFilter { |
| // fields ----------------------------------------------------------------- |
| |
| /** |
| * The list of nodes that this filter accepts ancestors-or-self of. |
| */ |
| private final List<DependencyNode> descendantNodes; |
| |
| // constructors ----------------------------------------------------------- |
| |
| public AncestorOrSelfDependencyNodeFilter(DependencyNode descendantNode) { |
| this(Collections.singletonList(descendantNode)); |
| } |
| |
| /** |
| * Creates a dependency node filter that only accepts nodes that are ancestors of, or equal to, the specified list |
| * of nodes. |
| * |
| * @param descendantNodes the list of nodes to accept ancestors-or-self of |
| */ |
| public AncestorOrSelfDependencyNodeFilter(List<DependencyNode> descendantNodes) { |
| this.descendantNodes = descendantNodes; |
| } |
| |
| // DependencyNodeFilter methods ------------------------------------------- |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean accept(DependencyNode node) { |
| for (DependencyNode descendantNode : descendantNodes) { |
| if (isAncestorOrSelf(node, descendantNode)) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| // private methods -------------------------------------------------------- |
| |
| /** |
| * Gets whether the first dependency node is an ancestor-or-self of the second. |
| * |
| * @param ancestorNode the ancestor-or-self dependency node |
| * @param descendantNode the dependency node to test |
| * @return <code>true</code> if <code>ancestorNode</code> is an ancestor, or equal to, <code>descendantNode</code> |
| */ |
| private boolean isAncestorOrSelf(DependencyNode ancestorNode, DependencyNode descendantNode) { |
| boolean ancestor = false; |
| |
| while (!ancestor && descendantNode != null) { |
| ancestor = ancestorNode.equals(descendantNode); |
| |
| descendantNode = descendantNode.getParent(); |
| } |
| |
| return ancestor; |
| } |
| } |