package org.apache.maven.artifact.resolver;

/*
 * 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 java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.codehaus.plexus.component.annotations.Component;

/**
 * @author Benjamin Bentmann
 */
@Component( role = ResolutionErrorHandler.class )
public class DefaultResolutionErrorHandler
    implements ResolutionErrorHandler
{

    public void throwErrors( ArtifactResolutionRequest request, ArtifactResolutionResult result )
        throws ArtifactResolutionException
    {
        // Metadata cannot be found

        if ( result.hasMetadataResolutionExceptions() )
        {
            throw result.getMetadataResolutionException( 0 );
        }

        // Metadata cannot be retrieved

        // Cyclic Dependency Error

        if ( result.hasCircularDependencyExceptions() )
        {
            throw result.getCircularDependencyException( 0 );
        }

        // Version Range Violation

        if ( result.hasVersionRangeViolations() )
        {
            throw result.getVersionRangeViolation( 0 );
        }

        // Transfer Error

        if ( result.hasErrorArtifactExceptions() )
        {
            throw result.getErrorArtifactExceptions().get( 0 );
        }

        if ( result.hasMissingArtifacts() )
        {
            throw new MultipleArtifactsNotFoundException( request.getArtifact(), toList( result.getArtifacts() ),
                                                          result.getMissingArtifacts(),
                                                          request.getRemoteRepositories() );
        }

        // this should never happen since we checked all possible error sources before but better be sure
        if ( result.hasExceptions() )
        {
            throw new ArtifactResolutionException( "Unknown error during artifact resolution, " + request + ", "
                + result.getExceptions(), request.getArtifact(), request.getRemoteRepositories() );
        }
    }

    private static <T> List<T> toList( Collection<T> items )
    {
        return ( items != null ) ? new ArrayList<T>( items ) : null;
    }

}
