package org.eclipse.aether.collection;

/*
 * 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.eclipse.aether.RepositoryException;

Thrown in case of bad artifact descriptors, version ranges or other issues encountered during calculation of the
dependency graph.
/**
 * Thrown in case of bad artifact descriptors, version ranges or other issues encountered during calculation of the
 * dependency graph.
 */
public class DependencyCollectionException
    extends RepositoryException
{

    private final transient CollectResult result;

    
Creates a new exception with the specified result.
Params:
result – The collection result at the point the exception occurred, may be null./**
     * Creates a new exception with the specified result.
     * 
     * @param result The collection result at the point the exception occurred, may be {@code null}.
     */
    public DependencyCollectionException( CollectResult result )
    {
        super( "Failed to collect dependencies for " + getSource( result ), getCause( result ) );
        this.result = result;
    }

    
Creates a new exception with the specified result and detail message.
Params:
result – The collection result at the point the exception occurred, may be null.
message – The detail message, may be null./**
     * Creates a new exception with the specified result and detail message.
     * 
     * @param result The collection result at the point the exception occurred, may be {@code null}.
     * @param message The detail message, may be {@code null}.
     */
    public DependencyCollectionException( CollectResult result, String message )
    {
        super( message, getCause( result ) );
        this.result = result;
    }

    
Creates a new exception with the specified result, detail message and cause.
Params:
result – The collection result at the point the exception occurred, may be null.
message – The detail message, may be null.
cause – The exception that caused this one, may be null./**
     * Creates a new exception with the specified result, detail message and cause.
     * 
     * @param result The collection 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 DependencyCollectionException( CollectResult result, String message, Throwable cause )
    {
        super( message, cause );
        this.result = result;
    }

    
Gets the collection 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.
Returns:
The collection result or null if unknown./**
     * Gets the collection 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 collection result or {@code null} if unknown.
     */
    public CollectResult getResult()
    {
        return result;
    }

    private static String getSource( CollectResult result )
    {
        if ( result == null )
        {
            return "";
        }

        CollectRequest request = result.getRequest();
        if ( request.getRoot() != null )
        {
            return request.getRoot().toString();
        }
        if ( request.getRootArtifact() != null )
        {
            return request.getRootArtifact().toString();
        }

        return request.getDependencies().toString();
    }

    private static Throwable getCause( CollectResult result )
    {
        Throwable cause = null;
        if ( result != null && !result.getExceptions().isEmpty() )
        {
            cause = result.getExceptions().get( 0 );
        }
        return cause;
    }

}