| package org.apache.velocity.app.event.implement; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache 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.apache.org/licenses/LICENSE-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. |
| */ |
| |
| import org.apache.velocity.app.event.IncludeEventHandler; |
| import org.apache.velocity.context.Context; |
| import org.apache.velocity.runtime.RuntimeServices; |
| import org.apache.velocity.util.ContextAware; |
| import org.apache.velocity.util.RuntimeServicesAware; |
| |
| import org.apache.commons.lang3.StringUtils; |
| |
| import org.slf4j.Logger; |
| |
| /** |
| * Simple event handler that checks to see if an included page is available. |
| * If not, it includes a designated replacement page instead. |
| * |
| * <P>By default, the name of the replacement page is "notfound.vm", however this |
| * page name can be changed by setting the Velocity property |
| * <code>eventhandler.include.notfound</code>, for example:</p> |
| * <pre><code> |
| * eventhandler.include.notfound = error.vm |
| * </code></pre> |
| * <p>The name of the missing resource is put into the Velocity context, under the |
| * key "missingResource", so that the "notfound" template can report the missing |
| * resource with a Velocity reference, like: |
| * <code>$missingResource</code> |
| * </p> |
| * |
| * @author <a href="mailto:wglass@forio.com">Will Glass-Husain</a> |
| * @version $Id$ |
| * @since 1.5 |
| */ |
| public class IncludeNotFound implements IncludeEventHandler, RuntimeServicesAware, ContextAware { |
| |
| private static final String DEFAULT_NOT_FOUND = "notfound.vm"; |
| private static final String PROPERTY_NOT_FOUND = "eventhandler.include.notfound"; |
| private RuntimeServices rs = null; |
| String notfound; |
| Context context; |
| |
| protected Logger log; |
| |
| /** |
| * Check to see if included file exists, and display "not found" page if it |
| * doesn't. If "not found" page does not exist, log an error and return |
| * null. |
| * |
| * @param includeResourcePath |
| * @param currentResourcePath |
| * @param directiveName |
| * @return message. |
| */ |
| public String includeEvent( |
| Context context, |
| String includeResourcePath, |
| String currentResourcePath, |
| String directiveName) |
| { |
| |
| /** |
| * check to see if page exists |
| */ |
| boolean exists = (rs.getLoaderNameForResource(includeResourcePath) != null); |
| if (!exists) |
| { |
| context.put("missingResource", includeResourcePath); |
| if (rs.getLoaderNameForResource(notfound) != null) |
| { |
| return notfound; |
| } |
| else |
| { |
| /** |
| * can't find not found, so display nothing |
| */ |
| log.error("Can't find include not found page: {}", notfound); |
| return null; |
| } |
| } |
| else |
| return includeResourcePath; |
| } |
| |
| |
| /** |
| * @see org.apache.velocity.util.RuntimeServicesAware#setRuntimeServices(org.apache.velocity.runtime.RuntimeServices) |
| */ |
| public void setRuntimeServices(RuntimeServices rs) |
| { |
| this.rs = rs; |
| log = rs.getLog("event"); |
| notfound = StringUtils.trim(rs.getString(PROPERTY_NOT_FOUND, DEFAULT_NOT_FOUND)); |
| } |
| |
| /** |
| * @see org.apache.velocity.util.ContextAware#setContext(org.apache.velocity.context.Context) |
| */ |
| public void setContext(Context context) |
| { |
| this.context = context; |
| } |
| } |