| package org.apache.maven.shared.dependency.tree.filter; |
| |
| /* |
| * 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.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.maven.shared.dependency.tree.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 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 descendantNodes ) |
| { |
| this.descendantNodes = descendantNodes; |
| } |
| |
| // DependencyNodeFilter methods ------------------------------------------- |
| |
| /* |
| * @see org.apache.maven.shared.dependency.tree.filter.DependencyNodeFilter#accept(org.apache.maven.shared.dependency.tree.DependencyNode) |
| */ |
| public boolean accept( DependencyNode node ) |
| { |
| boolean accept = false; |
| |
| for ( Iterator iterator = descendantNodes.iterator(); !accept && iterator.hasNext(); ) |
| { |
| DependencyNode descendantNode = (DependencyNode) iterator.next(); |
| |
| if ( isAncestorOrSelf( node, descendantNode ) ) |
| { |
| accept = true; |
| } |
| } |
| |
| return accept; |
| } |
| |
| // 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; |
| } |
| } |