| /* |
| * $Id$ |
| * |
| * 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.access; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.tiles.TilesApplicationContext; |
| import org.apache.tiles.TilesContainer; |
| import org.apache.tiles.reflect.ClassUtil; |
| |
| import java.lang.reflect.Method; |
| |
| |
| /** |
| * Provides static access to the tiles container. |
| * |
| * @version $Rev$ $Date$ |
| */ |
| public final class TilesAccess { |
| |
| /** |
| * Constructor, private to avoid instantiation. |
| */ |
| private TilesAccess() { |
| } |
| |
| /** |
| * The logging object. |
| */ |
| private static final Log LOG = |
| LogFactory.getLog(TilesAccess.class); |
| |
| /** |
| * The name of the attribute to use when getting and setting the container |
| * object in a context. |
| */ |
| public static final String CONTAINER_ATTRIBUTE = |
| "org.apache.tiles.CONTAINER"; |
| |
| /** |
| * The name of the attribute to get the {@link TilesApplicationContext} from |
| * a context. |
| */ |
| private static final String CONTEXT_ATTRIBUTE = |
| "org.apache.tiles.APPLICATION_CONTEXT"; |
| |
| /** |
| * Finds and returns the default Tiles container object, if it was |
| * previously initialized. |
| * |
| * @param context The (application) context object to use. |
| * @return The container if it has been configured previously, otherwise |
| * <code>null</code>. |
| * @see #setContainer(Object, TilesContainer) |
| */ |
| public static TilesContainer getContainer(Object context) { |
| return (TilesContainer) getAttribute(context, CONTAINER_ATTRIBUTE); |
| } |
| |
| /** |
| * Finds and returns a Tiles container object, if it was previously initialized. |
| * |
| * @param context The (application) context object to use. |
| * @return The container if it has been configured previously, otherwise |
| * <code>null</code>. |
| * @param key The key under which the container is stored. |
| * @see #setContainer(Object, TilesContainer) |
| * @since 2.1.0 |
| */ |
| public static TilesContainer getContainer(Object context, String key) { |
| if (key == null) { |
| key = CONTAINER_ATTRIBUTE; |
| } |
| |
| return (TilesContainer) getAttribute(context, key); |
| } |
| |
| /** |
| * Configures the default container to be used in the application. |
| * |
| * @param context The (application) context object to use. |
| * @param container The container object to set. |
| * @throws TilesAccessException If something goes wrong during manipulation of the |
| * context. |
| */ |
| public static void setContainer(Object context, TilesContainer container) { |
| setContainer(context, container, CONTAINER_ATTRIBUTE); |
| } |
| |
| /** |
| * Configures the container to be used in the application. |
| * |
| * @param context The (application) context object to use. |
| * @param container The container object to set. |
| * @param key The key under which the container will be stored. |
| * @throws TilesAccessException If something goes wrong during manipulation of the |
| * context. |
| */ |
| public static void setContainer(Object context, TilesContainer container, String key) { |
| if (key == null) { |
| key = CONTAINER_ATTRIBUTE; |
| } |
| |
| if (container == null) { |
| if (LOG.isInfoEnabled()) { |
| LOG.info("Removing TilesContext for context: " + context.getClass().getName()); |
| } |
| removeAttribute(context, key); |
| } |
| if (container != null && LOG.isInfoEnabled()) { |
| LOG.info("Publishing TilesContext for context: " + context.getClass().getName()); |
| } |
| setAttribute(context, key, container); |
| } |
| |
| /** |
| * Returns the Tiles application context object. |
| * |
| * @param context The (application) context to use. |
| * @return The required Tiles application context. |
| */ |
| public static TilesApplicationContext getApplicationContext(Object context) { |
| return getApplicationContext(context, null); |
| } |
| |
| /** |
| * Returns the Tiles application context object. |
| * |
| * @param context The (application) context to use. |
| * @param key The key under which the container is stored. |
| * @return The required Tiles application context. |
| * @since 2.1.0 |
| */ |
| public static TilesApplicationContext getApplicationContext(Object context, String key) { |
| TilesContainer container = getContainer(context, key); |
| if (container != null) { |
| return container.getApplicationContext(); |
| } |
| return (TilesApplicationContext) getAttribute(context, CONTEXT_ATTRIBUTE); |
| } |
| |
| /** |
| * Returns an attribute from a context. |
| * |
| * @param context The context object to use. |
| * @param attributeName The name of the attribute to search for. |
| * @return The object, that is the value of the specified attribute. |
| */ |
| private static Object getAttribute(Object context, String attributeName) { |
| Class<?> contextClass = context.getClass(); |
| Method attrMethod = ClassUtil.getForcedAccessibleMethod( |
| contextClass, "getAttribute", String.class); |
| return ClassUtil.invokeMethod(context, attrMethod, attributeName); |
| } |
| |
| /** |
| * Sets an attribute in a context. |
| * |
| * @param context The context object to use. |
| * @param name The name of the attribute to set. |
| * @param value The value of the attribute to set. |
| * @throws TilesAccessException If something goes wrong during setting the |
| * attribute. |
| */ |
| private static void setAttribute(Object context, String name, Object value) { |
| Class<?> contextClass = context.getClass(); |
| Method attrMethod = ClassUtil.getForcedAccessibleMethod( |
| contextClass, "setAttribute", String.class, Object.class); |
| ClassUtil.invokeMethod(context, attrMethod, name, value); |
| } |
| |
| /** |
| * Removes an attribute from a context. |
| * |
| * @param context The context object to use. |
| * @param name The name of the attribute to remove. |
| * @throws TilesAccessException If something goes wrong during removal. |
| */ |
| private static void removeAttribute(Object context, String name) { |
| Class<?> contextClass = context.getClass(); |
| Method attrMethod = ClassUtil.getForcedAccessibleMethod( |
| contextClass, "removeAttribute", String.class); |
| ClassUtil.invokeMethod(context, attrMethod, name); |
| } |
| } |