/**
* Copyright (c) 2002-2010 "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.shell.apps.extra;
import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.rmi.RemoteException;
import java.util.Map;
import org.neo4j.shell.Output;
/**
* Executes groovy scripts purely via reflection
*/
public class GshExecutor extends ScriptExecutor
{
private static final String BINDING_CLASS = "groovy.lang.Binding";
private static final String ENGINE_CLASS = "groovy.util.GroovyScriptEngine";
@Override
protected String getDefaultPaths()
{
return super.getDefaultPaths() + ":" +
"src" + File.separator + "main" + File.separator + "groovy";
}
@Override
protected String getPathKey()
{
return "GSH_PATH";
}
@Override
protected void runScript( Object groovyScriptEngine,
String scriptName, Map<String, Object> properties, String[] paths )
throws Exception
{
properties.put( "out",
new GshOutput( ( Output ) properties.get( "out" ) ) );
Object binding = this.newGroovyBinding( properties );
Method runMethod = groovyScriptEngine.getClass().getMethod(
"run", String.class, binding.getClass() );
runMethod.invoke( groovyScriptEngine, scriptName + ".groovy",
binding );
}
private Object newGroovyBinding( Map<String, Object> properties )
throws Exception
{
Class<?> cls = Class.forName( BINDING_CLASS );
Object binding = cls.newInstance();
Method setPropertyMethod =
cls.getMethod( "setProperty", String.class, Object.class );
for ( String key : properties.keySet() )
{
setPropertyMethod.invoke( binding, key, properties.get( key ) );
}
return binding;
}
@Override
protected Object newInterpreter( String[] paths )
throws Exception
{
Class<?> cls = Class.forName( ENGINE_CLASS );
return cls.getConstructor( String[].class ).newInstance(
new Object[] { paths } );
}
@Override
protected void ensureDependenciesAreInClasspath() throws Exception
{
Class.forName( BINDING_CLASS );
}
/**
* A wrapper for a supplied {@link Output} to correct a bug where a call
* to "println" or "print" with a GString or another object would use
* System.out instead of the right output instance.
*/
public static class GshOutput implements Output
{
private Output source;
GshOutput( Output output )
{
this.source = output;
}
public void print( Serializable object ) throws RemoteException
{
source.print( object );
}
public void println( Serializable object ) throws RemoteException
{
source.println( object );
}
public Appendable append( char c ) throws IOException
{
return source.append( c );
}
public Appendable append( CharSequence csq, int start, int end )
throws IOException
{
return source.append( csq, start, end );
}
public Appendable append( CharSequence csq ) throws IOException
{
return source.append( csq );
}
/**
* Prints an object to the wrapped {@link Output}.
* @param object the object to print.
* @throws RemoteException RMI error.
*/
public void print( Object object ) throws RemoteException
{
source.print( object.toString() );
}
public void println() throws RemoteException
{
source.println();
}
/**
* Prints an object to the wrapped {@link Output}.
* @param object the object to print.
* @throws RemoteException RMI error.
*/
public void println( Object object ) throws RemoteException
{
source.println( object.toString() );
}
}
}