+/*******************************************************************************
+ * Copyright (c) 2010, 2014 Sonatype, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Sonatype, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.aether.resolution;
+
+import org.eclipse.aether.RepositoryException;
+
+/**
+ * Thrown in case of an unresolvable metaversion.
+ */
+public class VersionResolutionException
+ extends RepositoryException
+{
+
+ private final transient VersionResult result;
+
+ /**
+ * Creates a new exception with the specified result.
+ *
+ * @param result The version result at the point the exception occurred, may be {@code null}.
+ */
+ public VersionResolutionException( VersionResult result )
+ {
+ super( getMessage( result ), getCause( result ) );
+ this.result = result;
+ }
+
+ private static String getMessage( VersionResult result )
+ {
+ StringBuilder buffer = new StringBuilder( 256 );
+ buffer.append( "Failed to resolve version" );
+ if ( result != null )
+ {
+ buffer.append( " for " ).append( result.getRequest().getArtifact() );
+ if ( !result.getExceptions().isEmpty() )
+ {
+ buffer.append( ": " ).append( result.getExceptions().iterator().next().getMessage() );
+ }
+ }
+ return buffer.toString();
+ }
+
+ private static Throwable getCause( VersionResult result )
+ {
+ Throwable cause = null;
+ if ( result != null && !result.getExceptions().isEmpty() )
+ {
+ cause = result.getExceptions().get( 0 );
+ }
+ return cause;
+ }
+
+ /**
+ * Creates a new exception with the specified result and detail message.
+ *
+ * @param result The version result at the point the exception occurred, may be {@code null}.
+ * @param message The detail message, may be {@code null}.
+ */
+ public VersionResolutionException( VersionResult result, String message )
+ {
+ super( message, getCause( result ) );
+ this.result = result;
+ }
+
+ /**
+ * Creates a new exception with the specified result, detail message and cause.
+ *
+ * @param result The version result at the point the exception occurred, may be {@code null}.
+ * @param message The detail message, may be {@code null}.
+ * @param cause The exception that caused this one, may be {@code null}.
+ */
+ public VersionResolutionException( VersionResult result, String message, Throwable cause )
+ {
+ super( message, cause );
+ this.result = result;
+ }
+
+ /**
+ * Gets the version result at the point the exception occurred. Despite being incomplete, callers might want to use
+ * this result to fail gracefully and continue their operation with whatever interim data has been gathered.
+ *
+ * @return The version result or {@code null} if unknown.
+ */
+ public VersionResult getResult()
+ {
+ return result;
+ }
+
+}