/*
 * Copyright (c) 2009-2011, IETR/INSA of Rennes
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *   * Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *   * Neither the name of the IETR/INSA of Rennes nor the names of its
 *     contributors may be used to endorse or promote products derived from this
 *     software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
package net.sf.orcc.df;

import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.ecore.EObject;

/**
 * This class defines an action tag as a list of strings.
 * 
 * @author Matthieu Wipliez
 * @model
 */
public interface Tag extends EObject {

	/**
	 * Adds an identifier to this tag.
	 * 
	 * @param identifier
	 *            an identifier
	 */
	void add(String identifier);

	/**
	 * Returns the identifier at the given index.
	 * 
	 * @param index
	 *            index of the identifier to return
	 * @return the identifier at the given index
	 */
	String get(int index);

	/**
	 * Returns identifiers of the tag.
	 * 
	 * @return a list of identifier
	 * @model dataType="org.eclipse.emf.ecore.EString" upper="-1"
	 */
	EList<String> getIdentifiers();

	/**
	 * Returns true if this tag is empty.
	 * 
	 * @return true if this tag is empty
	 */
	boolean isEmpty();

	/**
	 * Returns the number of identifiers in this tag.
	 * 
	 * @return the number of identifiers in this tag
	 */
	int size();

}