package org.apache.maven.usability;

 /*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  *  http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

  * KIND, either express or implied.  See the License for the

  * specific language governing permissions and limitations

  * under the License.

  */

 import org.apache.maven.artifact.manager.WagonManager;

 import org.apache.maven.artifact.resolver.ArtifactResolutionException;

 import org.apache.maven.usability.diagnostics.DiagnosisUtils;

 import org.apache.maven.usability.diagnostics.ErrorDiagnoser;

 import java.io.IOException;

 public class ArtifactResolverDiagnoser

     implements ErrorDiagnoser

 {

     private WagonManager wagonManager;

     public boolean canDiagnose( Throwable error )

     {

         return DiagnosisUtils.containsInCausality( error, ArtifactResolutionException.class );

     }

     public String diagnose( Throwable error )

     {

         ArtifactResolutionException exception =

             (ArtifactResolutionException) DiagnosisUtils.getFromCausality( error, ArtifactResolutionException.class );

         StringBuffer message = new StringBuffer();

         message.append( "Failed to resolve artifact." );

         message.append( "\n\n" );

         message.append( exception.getMessage() );

         IOException ioe = (IOException) DiagnosisUtils.getFromCausality( exception, IOException.class );

         if ( ioe != null && ioe.getMessage() != null && exception.getMessage().indexOf( ioe.getMessage() ) < 0 )

         {

             message.append( "\n\nCaused by I/O exception: " ).append( ioe.getMessage() );

         }

         if ( !wagonManager.isOnline() )

         {

             message.append( "\n" ).append( SystemWarnings.getOfflineWarning() );

         }

         message.append( "\n" );

         return message.toString();

     }

 }