| /* |
| * 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. |
| * |
| */ |
| |
| /* $Id$ */ |
| |
| package org.apache.lenya.cms.cocoon.acting; |
| |
| import java.util.Collections; |
| import java.util.Map; |
| |
| import org.apache.avalon.framework.parameters.Parameters; |
| import org.apache.avalon.framework.thread.ThreadSafe; |
| import org.apache.cocoon.acting.AbstractAction; |
| import org.apache.cocoon.environment.Redirector; |
| import org.apache.cocoon.environment.SourceResolver; |
| import org.apache.excalibur.source.Source; |
| import org.apache.excalibur.source.TraversableSource; |
| |
| |
| /** |
| * This action simply checks to see if a given resource exists. It checks |
| * whether the specified in the src attribute source exists or not. |
| * The action returns empty <code>Map</code> if it exists, null otherwise. |
| * <p>Instead of src attribute, source can be specified using |
| * parameter named 'url' (this is old syntax). |
| * <p>In order to differentiate between files and directories, the type can be specified |
| * using the parameter 'type' (<map:parameter name="type" value="file"/> or |
| * <map:parameter name="type" value="directory"/>). The parameter 'type' is optional. |
| * <p> |
| * <strong>Note:</strong> {@link org.apache.cocoon.selection.ResourceExistsSelector} |
| * should be preferred to this component, as the semantics of a Selector better |
| * match the supplied functionality. |
| */ |
| public class ResourceExistsAction extends AbstractAction implements ThreadSafe { |
| /** |
| * @see org.apache.cocoon.acting.Action#act(org.apache.cocoon.environment.Redirector, org.apache.cocoon.environment.SourceResolver, java.util.Map, java.lang.String, org.apache.avalon.framework.parameters.Parameters) |
| */ |
| public Map act(Redirector redirector, SourceResolver resolver, Map objectModel, String source, |
| Parameters parameters) throws Exception { |
| String url = parameters.getParameter("url", source); |
| String type = parameters.getParameter("type", "resource"); |
| Source src = null; |
| |
| try { |
| src = resolver.resolveURI(url); |
| |
| if (src.exists()) { |
| |
| boolean isCollection = false; |
| if (src instanceof TraversableSource) { |
| TraversableSource traversableSource = (TraversableSource) src; |
| isCollection = traversableSource.isCollection(); |
| } |
| |
| boolean exists = type.equals("resource") |
| || type.equals("file") && !isCollection |
| || type.equals("directory") && isCollection; |
| |
| if (exists) { |
| getLogger().debug(type + " exists: " + src.getURI()); |
| return Collections.EMPTY_MAP; |
| } |
| } |
| getLogger().debug(".act(): Resource " + source + " as type \"" + type + |
| "\" does not exist"); |
| } finally { |
| if (src != null) { |
| resolver.release(src); |
| } |
| } |
| |
| return null; |
| } |
| } |