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; 024 025import org.eclipse.aether.RepositorySystemSession; 026import org.eclipse.aether.artifact.ArtifactType; 027import org.eclipse.aether.artifact.ArtifactTypeRegistry; 028 029/** 030 * A short-lived artifact type registry that caches results from a presumably slower type registry. 031 * Internal helper class for collector implementations. 032 */ 033public class CachingArtifactTypeRegistry 034 implements ArtifactTypeRegistry 035{ 036 037 private final ArtifactTypeRegistry delegate; 038 039 private final Map<String, ArtifactType> types; 040 041 public static ArtifactTypeRegistry newInstance( RepositorySystemSession session ) 042 { 043 return newInstance( session.getArtifactTypeRegistry() ); 044 } 045 046 public static ArtifactTypeRegistry newInstance( ArtifactTypeRegistry delegate ) 047 { 048 return ( delegate != null ) ? new CachingArtifactTypeRegistry( delegate ) : null; 049 } 050 051 private CachingArtifactTypeRegistry( ArtifactTypeRegistry delegate ) 052 { 053 this.delegate = delegate; 054 types = new HashMap<>(); 055 } 056 057 public ArtifactType get( String typeId ) 058 { 059 ArtifactType type = types.get( typeId ); 060 061 if ( type == null ) 062 { 063 type = delegate.get( typeId ); 064 types.put( typeId, type ); 065 } 066 067 return type; 068 } 069 070}