| /* |
| * $Id$ |
| * |
| * 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.tiles.preparer.factory; |
| |
| import java.util.Collections; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.tiles.preparer.ViewPreparer; |
| import org.apache.tiles.request.Request; |
| import org.apache.tiles.request.reflect.ClassUtil; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Default implementation of the {@link PreparerFactory}. |
| * This factory provides no contextual configuration. It |
| * simply instantiates the named preparerInstance and returns it. |
| * |
| * @since Tiles 2.0 |
| * @version $Rev$ $Date$ |
| */ |
| public class BasicPreparerFactory implements PreparerFactory { |
| |
| /** |
| * The logging object. |
| */ |
| private final Logger log = LoggerFactory |
| .getLogger(BasicPreparerFactory.class); |
| |
| /** |
| * Maps a preparer name to the instantiated preparer. |
| */ |
| protected Map<String, ViewPreparer> preparers; |
| protected Set<String> knownPreparers; |
| |
| /** |
| * Constructor. |
| */ |
| public BasicPreparerFactory() { |
| this.preparers = new ConcurrentHashMap<String, ViewPreparer>(); |
| this.knownPreparers = Collections.newSetFromMap(new ConcurrentHashMap<String, Boolean>()); |
| } |
| |
| |
| /** |
| * Create a new instance of the named preparerInstance. This factory |
| * expects all names to be qualified class names. |
| * |
| * @param name the named preparerInstance |
| * @param context current context |
| * @return ViewPreparer instance |
| */ |
| public ViewPreparer getPreparer(String name, Request context) { |
| |
| if (!knownPreparers.contains(name)) { |
| knownPreparers.add(name); |
| ViewPreparer preparer = createPreparer(name); |
| if (preparer != null) { |
| preparers.put(name, preparer); |
| } |
| } |
| |
| return preparers.get(name); |
| } |
| |
| /** |
| * Creates a view preparer for the given name. |
| * |
| * @param name The name of the preparer. |
| * @return The created preparer. |
| */ |
| protected ViewPreparer createPreparer(String name) { |
| |
| log.debug("Creating ViewPreparer '{}' . . .", name); |
| |
| Object instance = ClassUtil.instantiate(name, true); |
| log.debug("ViewPreparer created successfully"); |
| return (ViewPreparer) instance; |
| |
| } |
| } |