IReferenceable.java

/**
 * This file Copyright (c) 2005-2008 Aptana, Inc. This program is
 * dual-licensed under both the Aptana Public License and the GNU General
 * Public license. You may elect to use one or the other of these licenses.
 * 
 * This program is distributed in the hope that it will be useful, but
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 * NONINFRINGEMENT. Redistribution, except as permitted by whichever of
 * the GPL or APL you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or modify this
 * program under the terms of the GNU General Public License,
 * Version 3, as published by the Free Software Foundation.  You should
 * have received a copy of the GNU General Public License, Version 3 along
 * with this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 * Aptana provides a special exception to allow redistribution of this file
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 * pursuant to Section 7 of the GPL. You may view the exception and these
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 * v1.0 which accompanies this distribution, and is available at
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 * You may view the GPL, Aptana's exception and additional terms, and the
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package com.aptana.ide.editor.js.runtime;



/**
 * @author Kevin Lindsey
 */
public interface IReferenceable
{
	/**
	 * Determine if this object can create a reference given its current state. In most cases, all IReferenceables will
	 * return true here. For example, GroupNodes may optionally contain a referenceable child, so in some cases,
	 * GroupNodes will not be able to return a valid Reference
	 * 
	 * @return Returns true if this object can generate a valid Reference
	 */
	boolean canMakeReference();

	/**
	 * Return a reference object that points to this command node's underlying instance. Note that most command nodes do
	 * not implement this method and therefor return null. Only commands nodes that can be used on the left side of an
	 * assignment need override this method.
	 * 
	 * @param environment
	 *            The environment to use when retrieving a reference
	 * @param fileIndex TODO
	 * @return Returns a Reference object that points to this node's underlying instance
	 */
	Reference getReference(Environment environment, int fileIndex);
}