1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.eclipse.aether.resolution;
20
21 import org.eclipse.aether.RepositoryException;
22
23 /**
24 * Thrown in case of an unresolvable metaversion.
25 */
26 public class VersionResolutionException extends RepositoryException {
27
28 private final transient VersionResult result;
29
30 /**
31 * Creates a new exception with the specified result.
32 *
33 * @param result The version result at the point the exception occurred, may be {@code null}.
34 */
35 public VersionResolutionException(VersionResult result) {
36 super(getMessage(result), getCause(result));
37 this.result = result;
38 }
39
40 private static String getMessage(VersionResult result) {
41 StringBuilder buffer = new StringBuilder(256);
42 buffer.append("Failed to resolve version");
43 if (result != null) {
44 buffer.append(" for ").append(result.getRequest().getArtifact());
45 if (!result.getExceptions().isEmpty()) {
46 buffer.append(": ")
47 .append(result.getExceptions().iterator().next().getMessage());
48 }
49 }
50 return buffer.toString();
51 }
52
53 private static Throwable getCause(VersionResult result) {
54 Throwable cause = null;
55 if (result != null && !result.getExceptions().isEmpty()) {
56 cause = result.getExceptions().get(0);
57 }
58 return cause;
59 }
60
61 /**
62 * Creates a new exception with the specified result and detail message.
63 *
64 * @param result The version result at the point the exception occurred, may be {@code null}.
65 * @param message The detail message, may be {@code null}.
66 */
67 public VersionResolutionException(VersionResult result, String message) {
68 super(message, getCause(result));
69 this.result = result;
70 }
71
72 /**
73 * Creates a new exception with the specified result, detail message and cause.
74 *
75 * @param result The version result at the point the exception occurred, may be {@code null}.
76 * @param message The detail message, may be {@code null}.
77 * @param cause The exception that caused this one, may be {@code null}.
78 */
79 public VersionResolutionException(VersionResult result, String message, Throwable cause) {
80 super(message, cause);
81 this.result = result;
82 }
83
84 /**
85 * Gets the version result at the point the exception occurred. Despite being incomplete, callers might want to use
86 * this result to fail gracefully and continue their operation with whatever interim data has been gathered.
87 *
88 * @return The version result or {@code null} if unknown.
89 */
90 public VersionResult getResult() {
91 return result;
92 }
93 }