/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/metaobj/trunk/metaobj-util/tool-lib/src/java/org/sakaiproject/metaobj/utils/mvc/impl/LocalVelocityConfigurer.java $
* $Id: LocalVelocityConfigurer.java 105079 2012-02-24 23:08:11Z ottenhoff@longsight.com $
***********************************************************************************
*
* Copyright (c) 2004, 2005, 2006, 2008 The Sakai Foundation
*
* Licensed under the Educational Community License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.opensource.org/licenses/ECL-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**********************************************************************************/
package org.sakaiproject.metaobj.utils.mvc.impl;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.exception.VelocityException;
import org.apache.velocity.runtime.RuntimeConstants;
import org.apache.velocity.runtime.resource.loader.FileResourceLoader;
import org.sakaiproject.metaobj.utils.mvc.intf.VelocityEngineFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.web.context.WebApplicationContext;
/**
* Created by IntelliJ IDEA.
* User: John Ellis
* Date: Jul 5, 2005
* Time: 4:21:23 PM
* To change this template use File | Settings | File Templates.
*/
public class LocalVelocityConfigurer implements InitializingBean, ApplicationContextAware, VelocityEngineFactory {
protected final transient Log logger = LogFactory.getLog(getClass());
private String resourceLoaderPath;
private boolean preferFileSystemAccess = true;
private Map velocityProperties;
private VelocityEngine velocityEngine;
private WebApplicationContext webApplicationContext;
/**
* Prepare the VelocityEngine instance and return it.
*
* @return the VelocityEngine instance
* @throws java.io.IOException if the config file wasn't found
* @throws org.apache.velocity.exception.VelocityException
* on Velocity initialization failure
*/
public VelocityEngine createVelocityEngine() throws IOException, VelocityException {
VelocityEngine velocityEngine = new VelocityEngine();
Properties props = new Properties();
// Merge local properties if set.
if (!this.velocityProperties.isEmpty()) {
props.putAll(this.velocityProperties);
}
// Apply properties to VelocityEngine.
for (Iterator it = props.entrySet().iterator(); it.hasNext();) {
Map.Entry entry = (Map.Entry) it.next();
if (!(entry.getKey() instanceof String)) {
throw new IllegalArgumentException("Illegal property key [" + entry.getKey() + "]: only Strings allowed");
}
velocityEngine.setProperty((String) entry.getKey(), entry.getValue());
}
initResourceLoader(velocityEngine);
try {
// Perform actual initialization.
velocityEngine.init();
}
catch (IOException ex) {
throw ex;
}
catch (VelocityException ex) {
throw ex;
}
catch (RuntimeException ex) {
throw ex;
}
catch (Exception ex) {
logger.error("Why does VelocityEngine throw a generic checked exception, after all?", ex);
throw new VelocityException(ex.getMessage());
}
return velocityEngine;
}
public String getRealPath(String path) {
return webApplicationContext.getServletContext().getRealPath(path);
}
/**
* Initialize a SpringResourceLoader for the given VelocityEngine.
*
* @param velocityEngine the VelocityEngine to configure
* @see org.springframework.ui.velocity.SpringResourceLoader
*/
protected void initResourceLoader(VelocityEngine velocityEngine) {
velocityEngine.setProperty(RuntimeConstants.RESOURCE_LOADER, "file");
velocityEngine.setProperty("file.resource.loader.description", "Velocity File Resource Loader");
velocityEngine.setProperty("file.resource.loader.class", FileResourceLoader.class.getName());
velocityEngine.setProperty("file.resource.loader.path", getRealPath(getResourceLoaderPath()));
velocityEngine.setProperty("file.resource.loader.cache", "true");
velocityEngine.setProperty("file.resource.loader.modificationCheckInterval", "0");
}
/**
* Initialize VelocityEngineFactory's VelocityEngine
* if not overridden by a preconfigured VelocityEngine.
*
* @see #createVelocityEngine
*/
public void afterPropertiesSet() throws IOException, VelocityException {
if (this.velocityEngine == null) {
this.velocityEngine = createVelocityEngine();
}
}
public VelocityEngine getVelocityEngine() {
return this.velocityEngine;
}
public String getResourceLoaderPath() {
return resourceLoaderPath;
}
public void setResourceLoaderPath(String resourceLoaderPath) {
this.resourceLoaderPath = resourceLoaderPath;
}
public boolean isPreferFileSystemAccess() {
return preferFileSystemAccess;
}
public void setPreferFileSystemAccess(boolean preferFileSystemAccess) {
this.preferFileSystemAccess = preferFileSystemAccess;
}
public Map getVelocityProperties() {
return velocityProperties;
}
public void setVelocityProperties(Map velocityProperties) {
this.velocityProperties = velocityProperties;
}
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.webApplicationContext = (WebApplicationContext) applicationContext;
}
}