001package org.eclipse.aether.util.graph.transformer; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022import org.eclipse.aether.RepositoryException; 023import org.eclipse.aether.collection.DependencyGraphTransformationContext; 024import org.eclipse.aether.collection.DependencyGraphTransformer; 025import org.eclipse.aether.graph.DependencyNode; 026 027import static java.util.Objects.requireNonNull; 028 029/** 030 * A dependency graph transformer that does not perform any changes on its input. 031 */ 032public final class NoopDependencyGraphTransformer 033 implements DependencyGraphTransformer 034{ 035 036 /** 037 * A ready-made instance of this dependency graph transformer which can safely be reused throughout an entire 038 * application regardless of multi-threading. 039 */ 040 public static final DependencyGraphTransformer INSTANCE = new NoopDependencyGraphTransformer(); 041 042 /** 043 * Creates a new instance of this graph transformer. Usually, {@link #INSTANCE} should be used instead. 044 */ 045 public NoopDependencyGraphTransformer() 046 { 047 } 048 049 public DependencyNode transformGraph( DependencyNode node, DependencyGraphTransformationContext context ) 050 throws RepositoryException 051 { 052 requireNonNull( node, "node cannot be null" ); 053 requireNonNull( context, "context cannot be null" ); 054 return node; 055 } 056 057}