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/*
* @(#)PathParserImpl.java
*
* Copyright (C) 2002-2003 Matt Albrecht
* groboclown@users.sourceforge.net
* http://groboutils.sourceforge.net
*
* Part of the GroboUtils package at:
* http://groboutils.sourceforge.net
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package net.sourceforge.groboutils.mbtf.v1.engine;
import net.sourceforge.groboutils.mbtf.v1.IPath;
import net.sourceforge.groboutils.mbtf.v1.IState;
import net.sourceforge.groboutils.mbtf.v1.IAction;
import net.sourceforge.groboutils.mbtf.v1.ISystem;
import net.sourceforge.groboutils.mbtf.v1.IErrors;
import net.sourceforge.groboutils.mbtf.v1.IValidate;
import net.sourceforge.groboutils.mbtf.v1.ITransition;
import net.sourceforge.groboutils.mbtf.v1.IPathParser;
import net.sourceforge.groboutils.mbtf.v1.IPathHistory;
import net.sourceforge.groboutils.mbtf.v1.IPathIterator;
import net.sourceforge.groboutils.mbtf.v1.TestHaltRuntimeException;
import net.sourceforge.groboutils.mbtf.v1.TestFailRuntimeException;
import org.apache.log4j.Logger;
/**
* Knows how to parse an IPath instance, and correctly follow the transitions
* and record errors.
*
* @author Matt Albrecht <a href="mailto:groboclown@users.sourceforge.net">groboclown@users.sourceforge.net</a>
* @version $Date: 2003/02/10 22:52:26 $
* @since June 12, 2002
*/
public class PathParserImpl implements IPathParser
{
private static final Logger LOG = Logger.getLogger( PathParserImpl.class );
/**
* @exception TestHaltRuntimeException if the path validation reports
* a <tt>halt()</tt> to <tt>errors</tt>.
*/
public IErrors parsePath( IPath path, ISystem sys )
{
ErrorsImpl ei = createErrors();
PathHistoryImpl phi = createPathHistory();
IState currentState = path.getStartState();
IPathIterator pi = path.iterator();
while (currentState != null
&& !ei.isHaltPath())
{
ErrorsImpl testErrs = createErrors();
try
{
testErrs.setCurrentPathHistory( phi );
LOG.debug( "Entering state "+currentState );
phi.addState( currentState );
LOG.debug( "Validating state "+currentState );
validate( currentState, testErrs, phi, sys );
currentState = null;
if (!testErrs.isHaltPath() && pi.hasNext())
{
ITransition trans = pi.nextTransition();
phi.addTransition( trans );
LOG.debug( "Vaidatling transition "+trans );
validate( trans, testErrs, phi, sys );
if (!testErrs.isHaltPath())
{
IAction act = trans.getAction();
LOG.debug( "Start Performing action "+act );
act.performAction( sys, testErrs );
LOG.debug( "End Performing action "+act );
currentState = trans.getDestinationState();
}
}
}
catch (TestHaltRuntimeException thre)
{
// should have already been caught
throw thre;
}
catch (ThreadDeath td)
{
// never catch these. never.
throw td;
}
catch (TestFailRuntimeException tfre)
{
// The error was already added to the error set.
// This exception ends this path, but the exception is
// not propigated.
}
catch (Throwable t)
{
testErrs.addError( "Uncaught exception", t );
if (t instanceof RuntimeException)
{
throw (RuntimeException)t;
}
t.printStackTrace();
throw new IllegalStateException( t.toString() );
}
finally
{
ei.addErrors( testErrs );
}
}
return ei;
}
protected void validate( IState state, ErrorsImpl ei, PathHistoryImpl phi,
ISystem sys )
throws CloneNotSupportedException
{
IValidate[] v = state.getValidates();
if (v.length <= 0)
{
ei.setCurrentPathHistory( phi );
ei.addError( "No validations for state '"+state.getName()+"'" );
return;
}
for (int i = 0; i < v.length && !ei.isHaltPath(); ++i)
{
ei.setCurrentPathHistory( phi );
v[i].validate( sys, ei );
phi.addValidate( v[i], state, ei );
ei.setCurrentPathHistory( phi );
}
}
protected void validate( ITransition trans, ErrorsImpl ei,
PathHistoryImpl phi, ISystem sys )
throws CloneNotSupportedException
{
IValidate[] v = trans.getValidates();
if (v.length <= 0)
{
ei.setCurrentPathHistory( phi );
ei.addError( "No validations for transition '"+
trans.getName()+"'" );
return;
}
for (int i = 0; i < v.length && !ei.isHaltPath(); ++i)
{
ei.setCurrentPathHistory( (IPathHistory)phi.clone() );
v[i].validate( sys, ei );
phi.addValidate( v[i], trans, ei );
ei.setCurrentPathHistory( (IPathHistory)phi.clone() );
}
}
protected ErrorsImpl createErrors()
{
return new ErrorsImpl();
}
protected PathHistoryImpl createPathHistory()
{
return new PathHistoryImpl();
}
}
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