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CommandLocator.java
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CommandLocator.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.commandline.admin;
import java.util.Objects;
import java.util.function.Function;
import java.util.function.Supplier;
import org.neo4j.helpers.Service;
import org.neo4j.helpers.collection.Iterables;
/**
* The CommandLocator locates named commands for the AdminTool, or supplies the set of available commands for printing
* help output.
*/
public interface CommandLocator
extends Function<String, AdminCommand.Provider>, Supplier<Iterable<AdminCommand.Provider>>
{
static CommandLocator fromServiceLocator()
{
return new CommandLocator()
{
@Override
public AdminCommand.Provider apply( String name )
{
return Service.load( AdminCommand.Provider.class, name );
}
@Override
public Iterable<AdminCommand.Provider> get()
{
return Service.load( AdminCommand.Provider.class );
}
};
}
static CommandLocator withAdditionalCommand( Supplier<AdminCommand.Provider> command, CommandLocator commands )
{
return new CommandLocator()
{
@Override
public AdminCommand.Provider apply( String name )
{
AdminCommand.Provider provider = command.get();
return Objects.equals( name, provider.name() ) ? provider : commands.apply( name );
}
@Override
public Iterable<AdminCommand.Provider> get()
{
return Iterables.append( command.get(), commands.get() );
}
};
}
}