CtxIdentifierFactory.java

/**
 * Copyright (c) 2011, SOCIETIES Consortium (WATERFORD INSTITUTE OF TECHNOLOGY (TSSG), HERIOT-WATT UNIVERSITY (HWU), SOLUTA.NET 
 * (SN), GERMAN AEROSPACE CENTRE (Deutsches Zentrum fuer Luft- und Raumfahrt e.V.) (DLR), Zavod za varnostne tehnologije
 * informacijske družbe in elektronsko poslovanje (SETCCE), INSTITUTE OF COMMUNICATION AND COMPUTER SYSTEMS (ICCS), LAKE
 * COMMUNICATIONS (LAKE), INTEL PERFORMANCE LEARNING SOLUTIONS LTD (INTEL), PORTUGAL TELECOM INOVAÇÃO, SA (PTIN), IBM Corp., 
 * INSTITUT TELECOM (ITSUD), AMITEC DIACHYTI EFYIA PLIROFORIKI KAI EPIKINONIES ETERIA PERIORISMENIS EFTHINIS (AMITEC), TELECOM 
 * ITALIA S.p.a.(TI),  TRIALOG (TRIALOG), Stiftelsen SINTEF (SINTEF), NEC EUROPE LTD (NEC))
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
 * conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 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 HOLDER 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 org.societies.android.api.context.model;

import org.societies.api.context.model.CtxModelType;
import org.societies.api.context.model.MalformedCtxIdentifierException;

/**
 * Describe your class here...
 *
 * @author <a href="mailto:nicolas.liampotis@cn.ntua.gr">Nicolas Liampotis</a> (ICCS)
 * @since 0.0.4
 */
public final class CtxIdentifierFactory {
	
	private static CtxIdentifierFactory instance = new CtxIdentifierFactory();
	 
	/**
	 * Prevents re-instantiation of this factory. 
	 */
	private CtxIdentifierFactory() {}
	
	/**
	 * Returns the instance of the context identifier factory.
	 * 
	 * @return the instance of the context identifier factory.
	 */
	public static synchronized CtxIdentifierFactory getInstance() {
	
		return instance;
	}
	
	/**
	 * 
	 * @param str
	 * @return
	 * @throws MalformedCtxIdentifierException
	 */
	public ACtxIdentifier fromString(String str) throws MalformedCtxIdentifierException {
		
		if (str == null)
			throw new NullPointerException("str cannot be null");
		
		if (str.indexOf(CtxModelType.ATTRIBUTE.toString()) != -1) 
			return new ACtxAttributeIdentifier(str);
		else if (str.indexOf(CtxModelType.ENTITY.toString()) != -1)
			return new ACtxEntityIdentifier(str);
		else if (str.indexOf(CtxModelType.ASSOCIATION.toString()) != -1)
			return new ACtxAssociationIdentifier(str);
		else
			throw new MalformedCtxIdentifierException();
	}
	 
	/**
	 * Prevents cloning
	 */
	@Override
	protected Object clone() throws CloneNotSupportedException {
		throw new CloneNotSupportedException("Clone is not allowed.");
	}
}