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ConfigLoader.java
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ConfigLoader.java
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/*
* Copyright (c) 2002-2016 "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.server.configuration;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.helpers.collection.MapUtil;
import org.neo4j.helpers.collection.Pair;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.logging.Log;
import org.neo4j.shell.ShellSettings;
import static org.neo4j.dbms.DatabaseManagementSystemSettings.data_directory;
import static org.neo4j.kernel.configuration.Settings.TRUE;
public class ConfigLoader
{
public static final String DEFAULT_CONFIG_FILE_NAME = "neo4j.conf";
private final SettingsClasses settingsClasses;
public ConfigLoader( SettingsClasses settingsClasses )
{
this.settingsClasses = settingsClasses;
}
public ConfigLoader( List<Class<?>> settingsClasses )
{
this( settings -> settingsClasses );
}
public Config loadConfig( Optional<File> configFile, Log log, Pair<String, String>... configOverrides )
{
return loadConfig( Optional.empty(), configFile, log, configOverrides );
}
public Config loadConfig( Optional<File> homeDir, Optional<File> configFile,
Log log, Pair<String, String>... configOverrides )
{
if ( log == null )
{
throw new IllegalArgumentException( "log cannot be null" );
}
Map<String, String> settings = calculateSettings( homeDir, configFile, log, configOverrides );
Config config = new Config( settings, settingsClasses.calculate( settings ) );
config.setLogger( log );
return config;
}
private Map<String, String> calculateSettings( Optional<File> homeDir, Optional<File> config, Log log,
Pair<String, String>[] configOverrides )
{
HashMap<String, String> settings = new HashMap<>();
config.ifPresent( ( c ) -> settings.putAll( loadFromFile( log, c ) ) );
settings.putAll( toMap( configOverrides ) );
overrideEmbeddedDefaults( settings );
homeDir.map( ( h ) ->
settings.put( GraphDatabaseSettings.neo4j_home.name(), h.getAbsolutePath() )
).orElse(
settings.put( GraphDatabaseSettings.neo4j_home.name(), System.getProperty( "user.dir" ) ) );
return settings;
}
private Map<String, String> toMap( Pair<String, String>[] configOverrides )
{
Map<String, String> overrides = new HashMap<>();
for ( Pair<String, String> configOverride : configOverrides )
{
overrides.put( configOverride.first(), configOverride.other() );
}
return overrides;
}
/*
* TODO: This means docs will say defaults are something other than what they are in the server. Better
* make embedded the special case and set the defaults to be what the server will have.
*/
private static void overrideEmbeddedDefaults( Map<String, String> config )
{
config.putIfAbsent( ShellSettings.remote_shell_enabled.name(), TRUE );
config.putIfAbsent( GraphDatabaseSettings.auth_enabled.name(), "true" );
String dataDirectory = config.getOrDefault( data_directory.name(), data_directory.getDefaultValue() );
config.putIfAbsent( GraphDatabaseSettings.auth_store.name(),
new File( dataDirectory, "dbms/auth" ).toString() );
}
private static Map<String, String> loadFromFile( Log log, File file )
{
if ( !file.exists() )
{
log.warn( "Config file [%s] does not exist.", file );
return new HashMap<>();
}
try
{
return MapUtil.load( file );
}
catch ( IOException e )
{
log.error( "Unable to load config file [%s]: %s", file, e.getMessage() );
return new HashMap<>();
}
}
public interface SettingsClasses
{
Iterable<Class<?>> calculate( Map<String, String> settings );
}
}