/***************************************************************************
* Copyright (C) by Fabrizio Montesi *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Library 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 Library General Public *
* License along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
* *
* For details about the authors of this software, see the AUTHORS file. *
***************************************************************************/
package jolie;
import java.util.HashMap;
import java.util.Map;
import jolie.runtime.InternalLink;
import jolie.runtime.Value;
/**
* A variable and links state.
* Variables are stored in a tree-like structure, of which the root Value element is stored.
* @see Value
* @author Fabrizio Montesi
*/
public class State implements Cloneable
{
private final Value root;
private final Map< String, InternalLink > linksMap =
new HashMap< String, InternalLink >();
private State( Value root )
{
this.root = root;
}
/**
* Returns the InternalLink identified by id in this State scope.
* @param id the identifier of the requested InternalLink
* @return the InternalLink identified by id
*/
public InternalLink getLink( String id )
{
InternalLink l = linksMap.get( id );
if ( l == null ) {
l = new InternalLink( id );
linksMap.put( id, l );
}
return l;
}
/**
* Constructs a new State, using a fresh memory state.
*/
public State()
{
this.root = Value.createRootValue();
}
@Override
public State clone()
{
return new State( Value.createClone( root ) );
}
/**
* Returns the root Value of this State.
* @return the root Value of this State
* @see Value
*/
public Value root()
{
return root;
}
}