/*
 * Reference ETL Parser for Java
 * Copyright (c) 2000-2009 Constantine A Plotnikov
 *
 * 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.sf.etl.parsers.internal.term_parser.states;

import net.sf.etl.parsers.TermContext;

// NOTE POST 0.2: implement some reference integrity check.
/**
 * This class is used in context to refer to activation factories from other
 * grammars. It provides necessary redirection level that allows independent
 * serialization and deserialization of compiled grammars.
 * 
 * @author const
 */
public class ActivationFactoryProxy implements ActivationFactory {
	/** system identifier of peer factory */
	private final TermContext context;
	/** a name of activation */
	private final String activationName;
	/**
	 * an activation that is referenced by this proxy, the reference is lost
	 * after serialization/deserialization. So it has to be restored later.
	 */
	private transient ActivationFactoryImpl refrerredActivation;

	/**
	 * A constructor
	 * 
	 * @param context
	 *            a context of this activation
	 * @param activationName
	 *            a name of referred activation
	 */
	public ActivationFactoryProxy(TermContext context, String activationName) {
		super();
		this.context = context;
		this.activationName = activationName;
	}

	/**
	 * @return the referred activation.
	 */
	public ActivationFactoryImpl getRefrerredActivation() {
		return refrerredActivation;
	}

	/**
	 * Set activation. This method is usually called during peer construction
	 * and deserialization postprocessing.
	 * 
	 * @param refrerredActivation
	 *            the referred activation to set.
	 */
	public void setRefrerredActivation(ActivationFactoryImpl refrerredActivation) {
		this.refrerredActivation = refrerredActivation;
	}

	/**
	 * @return Returns the activationName.
	 */
	public String activationName() {
		return activationName;
	}

	/**
	 * {@inheritDoc}
	 */
	public TermContext context() {
		return context;
	}

	/**
	 * {@inheritDoc}
	 */
	public Activation startWithPrimaryEntry(Activation previous) {
		return refrerredActivation.startWithPrimaryEntry(previous);
	}

	/**
	 * {@inheritDoc}
	 */
	public Activation startWithAlternateEntry(Activation previous) {
		return refrerredActivation.startWithAlternateEntry(previous);
	}

}