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LoadCommand.java
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LoadCommand.java
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.commandline.dbms;
import java.io.IOException;
import java.nio.file.AccessDeniedException;
import java.nio.file.FileAlreadyExistsException;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.nio.file.Paths;
import org.neo4j.commandline.admin.AdminCommand;
import org.neo4j.commandline.admin.CommandFailed;
import org.neo4j.commandline.admin.IncorrectUsage;
import org.neo4j.commandline.arguments.Arguments;
import org.neo4j.commandline.arguments.OptionalBooleanArg;
import org.neo4j.commandline.arguments.common.MandatoryCanonicalPath;
import org.neo4j.dbms.archive.IncorrectFormat;
import org.neo4j.dbms.archive.Loader;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.io.fs.FileUtils;
import org.neo4j.kernel.configuration.Config;
import static java.util.Objects.requireNonNull;
import static org.neo4j.commandline.Util.canonicalPath;
import static org.neo4j.commandline.Util.checkLock;
import static org.neo4j.commandline.Util.isSameOrChildPath;
import static org.neo4j.commandline.Util.wrapIOException;
import static org.neo4j.graphdb.factory.GraphDatabaseSettings.database_path;
import static org.neo4j.graphdb.factory.GraphDatabaseSettings.logical_logs_location;
public class LoadCommand implements AdminCommand
{
private static final Arguments arguments = new Arguments()
.withArgument( new MandatoryCanonicalPath( "from", "archive-path", "Path to archive created with the " +
"dump command." ) )
.withDatabase()
.withArgument( new OptionalBooleanArg( "force", false, "If an existing database should be replaced." ) );
private final Path homeDir;
private final Path configDir;
private final Loader loader;
public LoadCommand( Path homeDir, Path configDir, Loader loader )
{
requireNonNull(homeDir);
requireNonNull( configDir );
requireNonNull( loader );
this.homeDir = homeDir;
this.configDir = configDir;
this.loader = loader;
}
@Override
public void execute( String[] args ) throws IncorrectUsage, CommandFailed
{
arguments.parse( args );
Path archive = arguments.getMandatoryPath( "from" );
String database = arguments.get( "database" );
boolean force = arguments.getBoolean( "force" );
Config config = buildConfig( database );
Path databaseDirectory = canonicalPath( getDatabaseDirectory( config ) );
Path transactionLogsDirectory = canonicalPath( getTransactionalLogsDirectory( config ) );
deleteIfNecessary( databaseDirectory, transactionLogsDirectory, force );
load( archive, database, databaseDirectory, transactionLogsDirectory );
}
private Path getDatabaseDirectory( Config config )
{
return config.get( database_path ).toPath();
}
private Path getTransactionalLogsDirectory( Config config )
{
return config.get( logical_logs_location ).toPath();
}
private Config buildConfig( String databaseName )
{
return Config.fromFile( configDir.resolve( Config.DEFAULT_CONFIG_FILE_NAME ) )
.withHome( homeDir )
.withConnectorsDisabled()
.withSetting( GraphDatabaseSettings.active_database, databaseName )
.build();
}
private void deleteIfNecessary( Path databaseDirectory, Path transactionLogsDirectory, boolean force ) throws CommandFailed
{
try
{
if ( force )
{
checkLock( databaseDirectory );
FileUtils.deletePathRecursively( databaseDirectory );
if ( !isSameOrChildPath( databaseDirectory, transactionLogsDirectory ) )
{
FileUtils.deletePathRecursively( transactionLogsDirectory );
}
}
}
catch ( IOException e )
{
wrapIOException( e );
}
}
private void load( Path archive, String database, Path databaseDirectory, Path transactionLogsDirectory ) throws CommandFailed
{
try
{
loader.load( archive, databaseDirectory, transactionLogsDirectory );
}
catch ( NoSuchFileException e )
{
if ( Paths.get( e.getMessage() ).toAbsolutePath().equals( archive.toAbsolutePath() ) )
{
throw new CommandFailed( "archive does not exist: " + archive, e );
}
wrapIOException( e );
}
catch ( FileAlreadyExistsException e )
{
throw new CommandFailed( "database already exists: " + database, e );
}
catch ( AccessDeniedException e )
{
throw new CommandFailed(
"you do not have permission to load a database -- is Neo4j running as a " + "different user?", e );
}
catch ( IOException e )
{
wrapIOException( e );
}
catch ( IncorrectFormat incorrectFormat )
{
throw new CommandFailed( "Not a valid Neo4j archive: " + archive, incorrectFormat );
}
}
public static Arguments arguments()
{
return arguments;
}
}