/*
* Copyright (c) 2002-2008 "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 Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.util.shell;
import java.lang.reflect.Array;
import java.util.ArrayList;
/**
* Implements the {@link Console} interface with jLine using reflections only.
*/
public class JLineConsole implements Console
{
private ShellClient client;
private Object consoleReader;
private Object completor;
private boolean successfulGrabAvailableCommands = true;
public static JLineConsole newConsoleOrNullIfNotFound( ShellClient client )
{
try
{
Object consoleReader =
Class.forName( "jline.ConsoleReader" ).newInstance();
consoleReader.getClass().getMethod( "setBellEnabled",
Boolean.TYPE ).invoke( consoleReader, false );
return new JLineConsole( consoleReader, client );
}
catch ( Exception e )
{
return null;
}
}
private JLineConsole( Object consoleReader, ShellClient client )
{
this.consoleReader = consoleReader;
this.client = client;
}
public void format( String format, Object... args )
{
System.out.print( format );
}
private void grabAvailableCommands() throws Exception
{
Class<?> completorClass = Class.forName( "jline.Completor" );
if ( completor != null )
{
consoleReader.getClass().getMethod( "removeCompletor",
completorClass ).invoke( consoleReader, completor );
completor = null;
}
ArrayList<String> commandList = new ArrayList<String>();
for ( String command :
client.getServer().getAllAvailableCommands() )
{
commandList.add( command );
}
Object commandsArray = Array.newInstance( String.class,
commandList.size() );
int counter = 0;
for ( String command : commandList )
{
Array.set( commandsArray, counter++, command );
}
completor = Class.forName( "jline.SimpleCompletor" ).
getConstructor( commandsArray.getClass() ).newInstance(
commandsArray );
consoleReader.getClass().getMethod( "addCompletor",
completorClass ).invoke( consoleReader, completor );
}
public String readLine()
{
try
{
grabAvailableCommands();
successfulGrabAvailableCommands = true;
}
catch ( Exception e )
{
// It's ok. Maybe there's problems with the server connection?
if ( successfulGrabAvailableCommands )
{
System.err.println( "Couldn't grab available commands: " +
e.toString() );
successfulGrabAvailableCommands = false;
}
}
try
{
return ( String ) consoleReader.getClass().getMethod( "readLine" ).
invoke( consoleReader );
}
catch ( RuntimeException e )
{
throw e;
}
catch ( Exception e )
{
throw new RuntimeException( e );
}
}
}