001package org.eclipse.aether.util.artifact; 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.artifact.ArtifactType; 023import org.eclipse.aether.artifact.ArtifactTypeRegistry; 024 025/** 026 * An artifact type registry which first consults its own mappings and in case of an unknown type falls back to another 027 * type registry. 028 */ 029public final class OverlayArtifactTypeRegistry 030 extends SimpleArtifactTypeRegistry 031{ 032 033 private final ArtifactTypeRegistry delegate; 034 035 /** 036 * Creates a new artifact type registry with initially no registered artifact types and the specified fallback 037 * registry. Use {@link #add(ArtifactType)} to populate the registry. 038 * 039 * @param delegate The artifact type registry to fall back to, may be {@code null}. 040 */ 041 public OverlayArtifactTypeRegistry( ArtifactTypeRegistry delegate ) 042 { 043 this.delegate = delegate; 044 } 045 046 /** 047 * Adds the specified artifact type to the registry. 048 * 049 * @param type The artifact type to add, must not be {@code null}. 050 * @return This registry for chaining, never {@code null}. 051 */ 052 public OverlayArtifactTypeRegistry add( ArtifactType type ) 053 { 054 super.add( type ); 055 return this; 056 } 057 058 public ArtifactType get( String typeId ) 059 { 060 ArtifactType type = super.get( typeId ); 061 062 if ( type == null && delegate != null ) 063 { 064 type = delegate.get( typeId ); 065 } 066 067 return type; 068 } 069 070}