cms/org.argeo.slc.repo/src/org/eclipse/aether/resolution/VersionResolutionException.java

   1 /*******************************************************************************
   2  * Copyright (c) 2010, 2014 Sonatype, Inc.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *    Sonatype, Inc. - initial API and implementation
  10  *******************************************************************************/
  11 package org.eclipse.aether.resolution;
  12
  13 import org.eclipse.aether.RepositoryException;
  14
  15 /**
  16  * Thrown in case of an unresolvable metaversion.
  17  */
  18 public class VersionResolutionException
  19     extends RepositoryException
  20 {
  21
  22     private final transient VersionResult result;
  23
  24     /**
  25      * Creates a new exception with the specified result.
  26      *
  27      * @param result The version result at the point the exception occurred, may be {@code null}.
  28      */
  29     public VersionResolutionException( VersionResult result )
  30     {
  31         super( getMessage( result ), getCause( result ) );
  32         this.result = result;
  33     }
  34
  35     private static String getMessage( VersionResult result )
  36     {
  37         StringBuilder buffer = new StringBuilder( 256 );
  38         buffer.append( "Failed to resolve version" );
  39         if ( result != null )
  40         {
  41             buffer.append( " for " ).append( result.getRequest().getArtifact() );
  42             if ( !result.getExceptions().isEmpty() )
  43             {
  44                 buffer.append( ": " ).append( result.getExceptions().iterator().next().getMessage() );
  45             }
  46         }
  47         return buffer.toString();
  48     }
  49
  50     private static Throwable getCause( VersionResult result )
  51     {
  52         Throwable cause = null;
  53         if ( result != null && !result.getExceptions().isEmpty() )
  54         {
  55             cause = result.getExceptions().get( 0 );
  56         }
  57         return cause;
  58     }
  59
  60     /**
  61      * Creates a new exception with the specified result and detail message.
  62      *
  63      * @param result The version result at the point the exception occurred, may be {@code null}.
  64      * @param message The detail message, may be {@code null}.
  65      */
  66     public VersionResolutionException( VersionResult result, String message )
  67     {
  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     {
  81         super( message, cause );
  82         this.result = result;
  83     }
  84
  85     /**
  86      * Gets the version result at the point the exception occurred. Despite being incomplete, callers might want to use
  87      * this result to fail gracefully and continue their operation with whatever interim data has been gathered.
  88      *
  89      * @return The version result or {@code null} if unknown.
  90      */
  91     public VersionResult getResult()
  92     {
  93         return result;
  94     }
  95
  96 }