/*
* Name: JavaScriptController
* Authors: Richard Rodger
*
* Copyright (c) 2006 Richard Rodger
*
* This program 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
// package
package org.jostraca.process;
// import
import org.jostraca.Template;
import org.jostraca.Property;
import org.jostraca.util.PropertySet;
import org.jostraca.util.StandardException;
import org.jostraca.util.ArgUtil;
import org.jostraca.util.TextUtil;
import org.jostraca.util.MessageHandlerOutputStream;
import org.jostraca.util.UserMessageHandler;
import org.jostraca.util.RecordingUserMessageHandler;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import java.util.List;
import java.io.PrintStream;
/** Processing class for executing <code>CodeWriters</code> inside the Java process.
*/
public class JavaScriptController extends JavaController {
public JavaScriptController() {
// do nothing
}
protected void processImpl( Template pTemplate ) {
Template template = pTemplate;
PropertySet tmps = template.getMergedPropertySet();
boolean successful = false;
PrintStream sysOut = null;
PrintStream sysErr = null;
RecordingUserMessageHandler rumh = new RecordingUserMessageHandler();
Object result = null;
try {
String cwo = makeCodeWriterOptions( tmps, template );
String[] args = ArgUtil.splitQuoted( cwo );
// DO NOT use CommandLineUserMessageHandler here - causes infinite recursion
MessageHandlerOutputStream out = new MessageHandlerOutputStream( UserMessageHandler.INFO, rumh );
MessageHandlerOutputStream err = new MessageHandlerOutputStream( UserMessageHandler.ERROR, rumh );
// space out dots to avoid accidental replace on System DOT out search
sysOut = System . out;
sysErr = System . err;
// set context if not null
Object context = template.getContext();
boolean throwWriterExceptions = tmps.isYes( Property.main_CodeWriter_throwExceptions );
String script = template.getCodeWriterSource();
Context cx = Context.enter();
// DO NOT put System.out in MessageHandler as this will cause infinite loop
System.setOut( new PrintStream( out ) );
System.setErr( new PrintStream( err ) );
Scriptable scope = cx.initStandardObjects();
cx.evaluateString(scope, script, "CodeWriter Line Number: ", 1, null);
Object codewriterObj = scope.get( "codewriter", scope );
if( null == codewriterObj || !(codewriterObj instanceof Scriptable) ) {
throw new RuntimeException( "no codewriter in script" );
}
Scriptable codewriter = (Scriptable) codewriterObj;
Object _setContextObj = codewriter.get( "_setContext", codewriter );
if( null == _setContextObj || !(_setContextObj instanceof Function) ) {
throw new RuntimeException( "no codewriter._setContext in script" );
}
Function _setContext = (Function) _setContextObj;
_setContext.call(cx,scope,codewriter,new Object[]{context});
Object _generateObj = codewriter.get( "_generate", codewriter );
if( null == _generateObj || !(_generateObj instanceof Function) ) {
throw new RuntimeException( "no codewriter._generate in script" );
}
Function _generate = (Function) _generateObj;
result = _generate.call(cx,scope,codewriter,new Object[]{args,new Boolean(throwWriterExceptions)});
template.setResult( result );
}
catch( StandardException se ) {
if( null != sysOut ) {
System.setOut( sysOut );
}
if( null != sysErr ) {
System.setErr( sysErr );
}
throw se;
}
catch( Exception e ) {
if( null != sysOut ) {
System.setOut( sysOut );
}
if( null != sysErr ) {
System.setErr( sysErr );
}
throw new ProcessException( e );
}
finally {
if( null != sysOut ) {
System.setOut( sysOut );
}
if( null != sysErr ) {
System.setErr( sysErr );
}
Context.exit();
String out = rumh.toString( UserMessageHandler.INFO, false );
if( !TextUtil.isEmptyOrNull( out ) ) {
parseOutResult( out, template );
iUserMessageHandler.info( out );
}
String err = rumh.toString( UserMessageHandler.ERROR, false );
if( !TextUtil.isEmptyOrNull( err ) ) {
iUserMessageHandler.error( err );
}
}
}
protected void completeImpl( List pTemplateList ) {
// do nothing
}
}