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Usage.java
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Usage.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.admin;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;
import java.util.stream.Collectors;
import static java.lang.String.format;
public class Usage
{
private final String scriptName;
private final CommandLocator commands;
public Usage( String scriptName, CommandLocator commands )
{
this.scriptName = scriptName;
this.commands = commands;
}
public void printUsageForCommand( AdminCommand.Provider command, Consumer<String> output )
{
final CommandUsage commandUsage = new CommandUsage( command, scriptName );
commandUsage.printDetailed( output );
}
public void print( Consumer<String> output )
{
output.accept( format( "usage: %s <command>", scriptName ) );
output.accept( "" );
output.accept( "Manage your Neo4j instance." );
output.accept( "" );
output.accept( "environment variables:" );
printEnvironmentVariables( output );
output.accept( "available commands:" );
printCommands( output );
output.accept( "" );
output.accept( format( "Use %s help <command> for more details.", scriptName ) );
}
private void printEnvironmentVariables( Consumer<String> output )
{
output.accept( " NEO4J_CONF Path to directory which contains neo4j.conf." );
output.accept( " NEO4J_DEBUG Set to anything to enable debug output." );
output.accept( " NEO4J_HOME Neo4j home directory." );
output.accept( "" );
}
private void printCommands( Consumer<String> output )
{
Map<AdminCommandSection,List<AdminCommand.Provider>> groupedProviders = groupProvidersBySection();
AdminCommandSection.general()
.printAllCommandsUnderSection( output, groupedProviders.remove( AdminCommandSection.general() ) );
groupedProviders.entrySet().stream()
.sorted( Comparator.comparing( groupedProvider -> groupedProvider.getKey().printable() ) )
.forEach(entry -> entry.getKey().printAllCommandsUnderSection( output, entry.getValue() ) );
}
private Map<AdminCommandSection,List<AdminCommand.Provider>> groupProvidersBySection()
{
List<AdminCommand.Provider> providers = new ArrayList<>();
commands.getAllProviders().forEach( providers::add );
return providers.stream().collect( Collectors.groupingBy( ( provider ) -> provider.commandSection() ) );
}
}