| /* |
| * 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.struts2.util; |
| |
| import org.apache.struts2.ServletActionContext; |
| |
| import javax.servlet.jsp.PageContext; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * A Map that holds 4 levels of scope. |
| * <p> |
| * The scopes are the ones known in the web world: |
| * </p> |
| * |
| * <ul> |
| * <li>Page scope</li> |
| * <li>Request scope</li> |
| * <li>Session scope</li> |
| * <li>Application scope</li> |
| * </ul> |
| * |
| * A object is searched in the order above, starting from page and ending at application scope. |
| * |
| */ |
| public class AttributeMap implements Map { |
| |
| protected static final String UNSUPPORTED = "method makes no sense for a simplified map"; |
| |
| Map context; |
| |
| public AttributeMap(Map context) { |
| this.context = context; |
| } |
| |
| public boolean isEmpty() { |
| throw new UnsupportedOperationException(UNSUPPORTED); |
| } |
| |
| public void clear() { |
| throw new UnsupportedOperationException(UNSUPPORTED); |
| } |
| |
| public boolean containsKey(Object key) { |
| return (get(key) != null); |
| } |
| |
| public boolean containsValue(Object value) { |
| throw new UnsupportedOperationException(UNSUPPORTED); |
| } |
| |
| public Set entrySet() { |
| return Collections.EMPTY_SET; |
| } |
| |
| public Object get(Object key) { |
| PageContext pc = getPageContext(); |
| |
| if (pc == null) { |
| Map request = (Map) context.get("request"); |
| Map session = (Map) context.get("session"); |
| Map application = (Map) context.get("application"); |
| |
| if ((request != null) && (request.get(key) != null)) { |
| return request.get(key); |
| } else if ((session != null) && (session.get(key) != null)) { |
| return session.get(key); |
| } else if ((application != null) && (application.get(key) != null)) { |
| return application.get(key); |
| } |
| } else { |
| try{ |
| return pc.findAttribute(key.toString()); |
| }catch (NullPointerException npe){ |
| return null; |
| } |
| } |
| |
| return null; |
| } |
| |
| public Set keySet() { |
| return Collections.EMPTY_SET; |
| } |
| |
| public Object put(Object key, Object value) { |
| PageContext pc = getPageContext(); |
| if (pc != null) { |
| pc.setAttribute(key.toString(), value); |
| } |
| |
| return null; |
| } |
| |
| public void putAll(Map t) { |
| throw new UnsupportedOperationException(UNSUPPORTED); |
| } |
| |
| public Object remove(Object key) { |
| throw new UnsupportedOperationException(UNSUPPORTED); |
| } |
| |
| public int size() { |
| throw new UnsupportedOperationException(UNSUPPORTED); |
| } |
| |
| public Collection values() { |
| return Collections.EMPTY_SET; |
| } |
| |
| private PageContext getPageContext() { |
| return (PageContext) context.get(ServletActionContext.PAGE_CONTEXT); |
| } |
| |
| @Override |
| public String toString() { |
| return "AttributeMap {" + |
| "request=" + toStringSafe(context.get("request")) + |
| ", session=" + toStringSafe(context.get("session")) + |
| ", application=" + toStringSafe(context.get("application")) + |
| '}'; |
| } |
| |
| private String toStringSafe(Object obj) { |
| try { |
| if (obj != null) { |
| return String.valueOf(obj); |
| } |
| return ""; |
| } catch (Exception e) { |
| return "Exception thrown: " + e; |
| } |
| } |
| |
| } |