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
027/**
028 * A dependency graph transformer that does not perform any changes on its input.
029 */
030public final class NoopDependencyGraphTransformer
031    implements DependencyGraphTransformer
032{
033
034    /**
035     * A ready-made instance of this dependency graph transformer which can safely be reused throughout an entire
036     * application regardless of multi-threading.
037     */
038    public static final DependencyGraphTransformer INSTANCE = new NoopDependencyGraphTransformer();
039
040    /**
041     * Creates a new instance of this graph transformer. Usually, {@link #INSTANCE} should be used instead.
042     */
043    public NoopDependencyGraphTransformer()
044    {
045    }
046
047    public DependencyNode transformGraph( DependencyNode node, DependencyGraphTransformationContext context )
048        throws RepositoryException
049    {
050        return node;
051    }
052
053}