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/*******************************************************************************
 * 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.transfer;

import org.eclipse.aether.RepositoryException;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.repository.RemoteRepository;

/**
 * Thrown when an artifact could not be uploaded/downloaded to/from a particular remote repository.
 */
public class ArtifactTransferException
    extends RepositoryException
{

    private final transient Artifact artifact;

    private final transient RemoteRepository repository;

    private final boolean fromCache;

    static String getString( String prefix, RemoteRepository repository )
    {
        if ( repository == null )
        {
            return "";
        }
        else
        {
            return prefix + repository.getId() + " (" + repository.getUrl() + ")";
        }
    }

    /**
     * Creates a new exception with the specified artifact, repository and detail message.
     * 
     * @param artifact The untransferable artifact, may be {@code null}.
     * @param repository The involved remote repository, may be {@code null}.
     * @param message The detail message, may be {@code null}.
     */
    public ArtifactTransferException( Artifact artifact, RemoteRepository repository, String message )
    {
        this( artifact, repository, message, false );
    }

    /**
     * Creates a new exception with the specified artifact, repository and detail message.
     * 
     * @param artifact The untransferable artifact, may be {@code null}.
     * @param repository The involved remote repository, may be {@code null}.
     * @param message The detail message, may be {@code null}.
     * @param fromCache {@code true} if the exception was played back from the error cache, {@code false} if the
     *            exception actually just occurred.
     */
    public ArtifactTransferException( Artifact artifact, RemoteRepository repository, String message, boolean fromCache )
    {
        super( message );
        this.artifact = artifact;
        this.repository = repository;
        this.fromCache = fromCache;
    }

    /**
     * Creates a new exception with the specified artifact, repository and cause.
     * 
     * @param artifact The untransferable artifact, may be {@code null}.
     * @param repository The involved remote repository, may be {@code null}.
     * @param cause The exception that caused this one, may be {@code null}.
     */
    public ArtifactTransferException( Artifact artifact, RemoteRepository repository, Throwable cause )
    {
        this( artifact, repository, "Could not transfer artifact " + artifact + getString( " from/to ", repository )
            + getMessage( ": ", cause ), cause );
    }

    /**
     * Creates a new exception with the specified artifact, repository, detail message and cause.
     * 
     * @param artifact The untransferable artifact, may be {@code null}.
     * @param repository The involved remote repository, 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 ArtifactTransferException( Artifact artifact, RemoteRepository repository, String message, Throwable cause )
    {
        super( message, cause );
        this.artifact = artifact;
        this.repository = repository;
        this.fromCache = false;
    }

    /**
     * Gets the artifact that could not be transferred.
     * 
     * @return The troublesome artifact or {@code null} if unknown.
     */
    public Artifact getArtifact()
    {
        return artifact;
    }

    /**
     * Gets the remote repository involved in the transfer.
     * 
     * @return The involved remote repository or {@code null} if unknown.
     */
    public RemoteRepository getRepository()
    {
        return repository;
    }

    /**
     * Indicates whether this exception actually just occurred or was played back from the error cache.
     * 
     * @return {@code true} if the exception was played back from the error cache, {@code false} if the exception
     *         actually occurred just now.
     */
    public boolean isFromCache()
    {
        return fromCache;
    }

}