| /* |
| * 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. |
| */ |
| package org.apache.commons.chain2.web; |
| |
| import org.apache.commons.chain2.Catalog; |
| import org.apache.commons.chain2.CatalogFactory; |
| import org.apache.commons.chain2.config.xml.XmlConfigParser; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import javax.servlet.ServletContext; |
| import java.net.URL; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.StringTokenizer; |
| |
| /** |
| * <p>Utility methods for loading class loader and web application resources |
| * to configure a {@link Catalog}. These methods are shared between |
| * <code>ChainListener</code> and <code>ChainServlet</code>.</p> |
| * |
| * @version $Id$ |
| */ |
| final class ChainResources { |
| |
| /** |
| * This class uses a private constructor because it is a utility class. |
| */ |
| private ChainResources() { |
| } |
| |
| // ---------------------------------------------------------- Static Methods |
| |
| /** |
| * <p>Parse the specified class loader resources.</p> |
| * |
| * @param resources Comma-delimited list of resources (or <code>null</code>) |
| * @param parser {@link XmlConfigParser} to use for parsing |
| */ |
| static void parseClassResources(String resources, |
| XmlConfigParser parser) { |
| if (resources == null) { |
| return; |
| } |
| Log log = LogFactory.getLog(ChainResources.class); |
| ClassLoader loader = |
| Thread.currentThread().getContextClassLoader(); |
| if (loader == null) { |
| loader = ChainResources.class.getClassLoader(); |
| } |
| String[] paths = getResourcePaths(resources); |
| String path = null; |
| try { |
| for (String path1 : paths) { |
| path = path1; |
| URL url = loader.getResource(path); |
| if (url == null) { |
| throw new IllegalStateException |
| ("Missing chain config resource '" + path + "'"); |
| } |
| if (log.isDebugEnabled()) { |
| log.debug("Loading chain config resource '" + path + "'"); |
| } |
| @SuppressWarnings("unused") // FIXME we have to assign the factory here to help the compiler with the type arguments |
| CatalogFactory<Object,Object,Map<Object,Object>> factory = parser.parse(url); |
| } |
| } catch (Exception e) { |
| throw new RuntimeException |
| ("Exception parsing chain config resource '" + path + "': " |
| + e.getMessage()); |
| } |
| } |
| |
| /** |
| * <p>Parse the specified web application resources.</p> |
| * |
| * @param context <code>ServletContext</code> for this web application |
| * @param resources Comma-delimited list of resources (or <code>null</code>) |
| * @param parser {@link XmlConfigParser} to use for parsing |
| */ |
| static void parseWebResources(ServletContext context, |
| String resources, |
| XmlConfigParser parser) { |
| if (resources == null) { |
| return; |
| } |
| Log log = LogFactory.getLog(ChainResources.class); |
| String[] paths = getResourcePaths(resources); |
| String path = null; |
| try { |
| for (String path1 : paths) { |
| path = path1; |
| URL url = context.getResource(path); |
| if (url == null) { |
| throw new IllegalStateException |
| ("Missing chain config resource '" + path + "'"); |
| } |
| if (log.isDebugEnabled()) { |
| log.debug("Loading chain config resource '" + path + "'"); |
| } |
| @SuppressWarnings("unused") // FIXME we have to assign the factory here to help the compiler with the type arguments |
| CatalogFactory<Object, Object, Map<Object, Object>> factory = parser.parse(url); |
| } |
| } catch (Exception e) { |
| throw new RuntimeException |
| ("Exception parsing chain config resource '" + path + "': " |
| + e.getMessage()); |
| } |
| } |
| |
| /** |
| * <p> Parse the resource string into an array of paths. Empty entries will |
| * be skipped. (That is, all entries in the array are non-empty paths.)</p> |
| * |
| * @param resources A comma-delimited list of resource paths (or |
| * <code>null</code>). |
| * |
| * @return An array of non-empty paths. The array itself may be empty. |
| * |
| * @since Chain 1.1 |
| */ |
| static String[] getResourcePaths(String resources) { |
| if (resources == null || resources.length() == 0) { |
| return new String[0]; |
| } |
| |
| StringTokenizer resourcesTokenizer = new StringTokenizer(resources, ","); |
| List<String> paths = new ArrayList<String>(resourcesTokenizer.countTokens()); |
| |
| while (resourcesTokenizer.hasMoreTokens()) { |
| String path = resourcesTokenizer.nextToken().trim(); |
| if (path.length() > 0) { |
| paths.add(path); |
| } |
| } |
| |
| return paths.toArray(new String[paths.size()]); |
| } |
| |
| } |