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 }