1 package org.eclipse.aether.resolution;
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.RepositoryException;
23
24 /**
25 * Thrown in case of an unresolvable metaversion.
26 */
27 public class VersionResolutionException
28 extends RepositoryException
29 {
30
31 private final transient VersionResult result;
32
33 /**
34 * Creates a new exception with the specified result.
35 *
36 * @param result The version result at the point the exception occurred, may be {@code null}.
37 */
38 public VersionResolutionException( VersionResult result )
39 {
40 super( getMessage( result ), getCause( result ) );
41 this.result = result;
42 }
43
44 private static String getMessage( VersionResult result )
45 {
46 StringBuilder buffer = new StringBuilder( 256 );
47 buffer.append( "Failed to resolve version" );
48 if ( result != null )
49 {
50 buffer.append( " for " ).append( result.getRequest().getArtifact() );
51 if ( !result.getExceptions().isEmpty() )
52 {
53 buffer.append( ": " ).append( result.getExceptions().iterator().next().getMessage() );
54 }
55 }
56 return buffer.toString();
57 }
58
59 private static Throwable getCause( VersionResult result )
60 {
61 Throwable cause = null;
62 if ( result != null && !result.getExceptions().isEmpty() )
63 {
64 cause = result.getExceptions().get( 0 );
65 }
66 return cause;
67 }
68
69 /**
70 * Creates a new exception with the specified result and detail message.
71 *
72 * @param result The version result at the point the exception occurred, may be {@code null}.
73 * @param message The detail message, may be {@code null}.
74 */
75 public VersionResolutionException( VersionResult result, String message )
76 {
77 super( message, getCause( result ) );
78 this.result = result;
79 }
80
81 /**
82 * Creates a new exception with the specified result, detail message and cause.
83 *
84 * @param result The version result at the point the exception occurred, may be {@code null}.
85 * @param message The detail message, may be {@code null}.
86 * @param cause The exception that caused this one, may be {@code null}.
87 */
88 public VersionResolutionException( VersionResult result, String message, Throwable cause )
89 {
90 super( message, cause );
91 this.result = result;
92 }
93
94 /**
95 * Gets the version result at the point the exception occurred. Despite being incomplete, callers might want to use
96 * this result to fail gracefully and continue their operation with whatever interim data has been gathered.
97 *
98 * @return The version result or {@code null} if unknown.
99 */
100 public VersionResult getResult()
101 {
102 return result;
103 }
104
105 }