001package org.eclipse.aether.internal.impl.collect; 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 java.util.HashMap; 023import java.util.Map; 024import static java.util.Objects.requireNonNull; 025 026import org.eclipse.aether.RepositorySystemSession; 027import org.eclipse.aether.collection.DependencyGraphTransformationContext; 028 029/** 030 * Default implementation of {@link DependencyGraphTransformationContext}. 031 * Internal helper class for collector implementations. 032 */ 033public class DefaultDependencyGraphTransformationContext 034 implements DependencyGraphTransformationContext 035{ 036 037 private final RepositorySystemSession session; 038 039 private final Map<Object, Object> map; 040 041 public DefaultDependencyGraphTransformationContext( RepositorySystemSession session ) 042 { 043 this.session = session; 044 this.map = new HashMap<>(); 045 } 046 047 @Override 048 public RepositorySystemSession getSession() 049 { 050 return session; 051 } 052 053 @Override 054 public Object get( Object key ) 055 { 056 return map.get( requireNonNull( key, "key cannot be null" ) ); 057 } 058 059 @Override 060 public Object put( Object key, Object value ) 061 { 062 requireNonNull( key, "key cannot be null" ); 063 if ( value != null ) 064 { 065 return map.put( key, value ); 066 } 067 else 068 { 069 return map.remove( key ); 070 } 071 } 072 073 @Override 074 public String toString() 075 { 076 return String.valueOf( map ); 077 } 078 079}