/*******************************************************************************
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 * 
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * 
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 ******************************************************************************/
/*
 * Copyright 2011 by Graz University of Technology, Austria
 * The Austrian STORK Modules have been developed by the E-Government
 * Innovation Center EGIZ, a joint initiative of the Federal Chancellery
 * Austria and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */


/**
 * 
 */
package at.gv.egiz.eaaf.core.impl.gui.velocity;

import org.apache.velocity.app.Velocity;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.runtime.RuntimeConstants;

/**
 * Gets a Velocity Engine
 * 
 * @author bzwattendorfer
 *
 */
public class VelocityProvider {

	private static VelocityEngine velocityEngine = null;
	
	/**
	 * Gets velocityEngine from Classpath
	 * @return VelocityEngine
	 * @throws Exception
	 */
	public static VelocityEngine getClassPathVelocityEngine() throws Exception {
		if (velocityEngine == null) {
			velocityEngine = getBaseVelocityEngine();
			velocityEngine.setProperty(RuntimeConstants.RESOURCE_LOADER, "classpath");
			velocityEngine.setProperty("classpath.resource.loader.class",
					"org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");                
			velocityEngine.init();
			
		}
		
		return velocityEngine;
	}
	
	/**
	 * Gets VelocityEngine from File
	 * @param rootPath File Path to template file
	 * @return VelocityEngine
	 * @throws Exception
	 */
	public static VelocityEngine getFileVelocityEngine(String rootPath) throws Exception {
		if (velocityEngine == null) {
			velocityEngine = getBaseVelocityEngine();
			velocityEngine.setProperty(RuntimeConstants.RESOURCE_LOADER, "file");
			velocityEngine.setProperty("file.resource.loader.class",
					"org.apache.velocity.runtime.resource.loader.FileResourceLoader");
			velocityEngine.setProperty("file.resource.loader.path", rootPath);
        
			velocityEngine.init();
			
		}
		
		return velocityEngine;
	}
	
	/**
	 * Gets a basic VelocityEngine
	 * @return VelocityEngine
	 */
	private static VelocityEngine getBaseVelocityEngine() {
		VelocityEngine velocityEngine = new VelocityEngine();
        velocityEngine.setProperty(RuntimeConstants.INPUT_ENCODING, "UTF-8");
        velocityEngine.setProperty(RuntimeConstants.OUTPUT_ENCODING, "UTF-8");
//        velocityEngine.setProperty(RuntimeConstants.RUNTIME_LOG_LOGSYSTEM_CLASS,
//				"org.apache.velocity.runtime.log.SimpleLog4JLogSystem");
        velocityEngine.setProperty(Velocity.RUNTIME_LOG_LOGSYSTEM, new VelocityLogAdapter() );
        
        return velocityEngine;
	}
	
}