1 package org.eclipse.aether.util.artifact; 2 3 /* 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 22 import org.eclipse.aether.artifact.ArtifactType; 23 import org.eclipse.aether.artifact.ArtifactTypeRegistry; 24 25 /** 26 * An artifact type registry which first consults its own mappings and in case of an unknown type falls back to another 27 * type registry. 28 */ 29 public final class OverlayArtifactTypeRegistry 30 extends SimpleArtifactTypeRegistry 31 { 32 33 private final ArtifactTypeRegistry delegate; 34 35 /** 36 * Creates a new artifact type registry with initially no registered artifact types and the specified fallback 37 * registry. Use {@link #add(ArtifactType)} to populate the registry. 38 * 39 * @param delegate The artifact type registry to fall back to, may be {@code null}. 40 */ 41 public OverlayArtifactTypeRegistry( ArtifactTypeRegistry delegate ) 42 { 43 this.delegate = delegate; 44 } 45 46 /** 47 * Adds the specified artifact type to the registry. 48 * 49 * @param type The artifact type to add, must not be {@code null}. 50 * @return This registry for chaining, never {@code null}. 51 */ 52 public OverlayArtifactTypeRegistry add( ArtifactType type ) 53 { 54 super.add( type ); 55 return this; 56 } 57 58 public ArtifactType get( String typeId ) 59 { 60 ArtifactType type = super.get( typeId ); 61 62 if ( type == null && delegate != null ) 63 { 64 type = delegate.get( typeId ); 65 } 66 67 return type; 68 } 69 70 }