1 package org.eclipse.aether.util.graph.transformer;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import org.eclipse.aether.RepositoryException;
23 import org.eclipse.aether.collection.DependencyGraphTransformationContext;
24 import org.eclipse.aether.collection.DependencyGraphTransformer;
25 import org.eclipse.aether.graph.DependencyNode;
26
27 import static java.util.Objects.requireNonNull;
28
29 /**
30 * A dependency graph transformer that does not perform any changes on its input.
31 */
32 public final class NoopDependencyGraphTransformer
33 implements DependencyGraphTransformer
34 {
35
36 /**
37 * A ready-made instance of this dependency graph transformer which can safely be reused throughout an entire
38 * application regardless of multi-threading.
39 */
40 public static final DependencyGraphTransformer INSTANCE = new NoopDependencyGraphTransformer();
41
42 /**
43 * Creates a new instance of this graph transformer. Usually, {@link #INSTANCE} should be used instead.
44 */
45 public NoopDependencyGraphTransformer()
46 {
47 }
48
49 public DependencyNode transformGraph( DependencyNode node, DependencyGraphTransformationContext context )
50 throws RepositoryException
51 {
52 requireNonNull( node, "node cannot be null" );
53 requireNonNull( context, "context cannot be null" );
54 return node;
55 }
56
57 }