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/*
    This file is part of Sarasvati.

    Sarasvati is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    Sarasvati 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with Sarasvati.  If not, see .

    Copyright 2008 Paul Lorenz
*/
package com.googlecode.sarasvati.impl;

import com.googlecode.sarasvati.CustomNode;
import com.googlecode.sarasvati.Engine;
import com.googlecode.sarasvati.Graph;
import com.googlecode.sarasvati.GraphProcess;
import com.googlecode.sarasvati.NodeToken;
import com.googlecode.sarasvati.SarasvatiException;
import com.googlecode.sarasvati.event.ProcessEvent;

/**
 * Node type for nested processes. Stores the name of the graph to be
 * executed.
 *
 * @author Paul Lorenz
 */
public class NestedProcessNode extends CustomNode
{
  protected String graphName;

  public String getGraphName()
  {
    return graphName;
  }

  public void setGraphName(final String graphName)
  {
    this.graphName = graphName;
  }

  @Override
  public void execute(final Engine engine, final NodeToken token)
  {
    final Engine nestedEngine = engine.newEngine(true);
    final Graph subGraph = nestedEngine.getRepository().getLatestGraph( graphName );

    if ( subGraph == null )
    {
      throw new SarasvatiException("No version of graph named '" + graphName + "'. " +
                                   "Used by node " + getName() + " in graph " + getGraph().getName());
    }

    final GraphProcess subProcess = nestedEngine.getFactory().newNestedProcess(subGraph, token);
    subProcess.getEnv().importEnv(token.getFullEnv());
    ProcessEvent.fireCreatedEvent(nestedEngine, subProcess);
    nestedEngine.startProcess(subProcess);
  }
}