001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.eclipse.aether.internal.impl.collect; 020 021import java.util.HashMap; 022import java.util.Map; 023 024import org.eclipse.aether.RepositorySystemSession; 025import org.eclipse.aether.artifact.ArtifactType; 026import org.eclipse.aether.artifact.ArtifactTypeRegistry; 027 028/** 029 * A short-lived artifact type registry that caches results from a presumably slower type registry. 030 * Internal helper class for collector implementations. 031 */ 032public class CachingArtifactTypeRegistry implements ArtifactTypeRegistry { 033 034 private final ArtifactTypeRegistry delegate; 035 036 private final Map<String, ArtifactType> types; 037 038 public static ArtifactTypeRegistry newInstance(RepositorySystemSession session) { 039 return newInstance(session.getArtifactTypeRegistry()); 040 } 041 042 public static ArtifactTypeRegistry newInstance(ArtifactTypeRegistry delegate) { 043 return (delegate != null) ? new CachingArtifactTypeRegistry(delegate) : null; 044 } 045 046 private CachingArtifactTypeRegistry(ArtifactTypeRegistry delegate) { 047 this.delegate = delegate; 048 types = new HashMap<>(); 049 } 050 051 public ArtifactType get(String typeId) { 052 ArtifactType type = types.get(typeId); 053 054 if (type == null) { 055 type = delegate.get(typeId); 056 types.put(typeId, type); 057 } 058 059 return type; 060 } 061}