| /******************************************************************************* |
| * Copyright (c) 2010, 2011 Sonatype, Inc. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Sonatype, Inc. - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.aether.util.graph.transformer; |
| |
| import org.eclipse.aether.RepositoryException; |
| import org.eclipse.aether.collection.DependencyGraphTransformationContext; |
| import org.eclipse.aether.collection.DependencyGraphTransformer; |
| import org.eclipse.aether.graph.DependencyNode; |
| |
| /** |
| * A dependency graph transformer that chains other transformers. |
| */ |
| public final class ChainedDependencyGraphTransformer |
| implements DependencyGraphTransformer |
| { |
| |
| private final DependencyGraphTransformer[] transformers; |
| |
| /** |
| * Creates a new transformer that chains the specified transformers. |
| * |
| * @param transformers The transformers to chain, may be {@code null} or empty. |
| */ |
| public ChainedDependencyGraphTransformer( DependencyGraphTransformer... transformers ) |
| { |
| if ( transformers == null ) |
| { |
| this.transformers = new DependencyGraphTransformer[0]; |
| } |
| else |
| { |
| this.transformers = transformers; |
| } |
| } |
| |
| /** |
| * Creates a new transformer that chains the specified transformers or simply returns one of them if the other one |
| * is {@code null}. |
| * |
| * @param transformer1 The first transformer of the chain, may be {@code null}. |
| * @param transformer2 The second transformer of the chain, may be {@code null}. |
| * @return The chained transformer or {@code null} if both input transformers are {@code null}. |
| */ |
| public static DependencyGraphTransformer newInstance( DependencyGraphTransformer transformer1, |
| DependencyGraphTransformer transformer2 ) |
| { |
| if ( transformer1 == null ) |
| { |
| return transformer2; |
| } |
| else if ( transformer2 == null ) |
| { |
| return transformer1; |
| } |
| return new ChainedDependencyGraphTransformer( transformer1, transformer2 ); |
| } |
| |
| public DependencyNode transformGraph( DependencyNode node, DependencyGraphTransformationContext context ) |
| throws RepositoryException |
| { |
| for ( DependencyGraphTransformer transformer : transformers ) |
| { |
| node = transformer.transformGraph( node, context ); |
| } |
| return node; |
| } |
| |
| } |