2 * Copyright 2001-2007 Internet2
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 * @file xmltooling/util/ReloadableXMLFile.h
20 * Base class for file-based XML configuration.
23 #ifndef __xmltooling_reloadable_h__
24 #define __xmltooling_reloadable_h__
26 #include <xmltooling/Lockable.h>
27 #include <xmltooling/util/Threads.h>
31 #include <xercesc/dom/DOM.hpp>
33 namespace xmltooling {
36 * Base class for file-based XML configuration.
38 class XMLTOOL_API ReloadableXMLFile : protected virtual Lockable
40 MAKE_NONCOPYABLE(ReloadableXMLFile);
44 * Constructor taking a DOM element supporting the following content:
47 * <dt>file | filename | path | pathname</dt>
48 * <dd>identifies a local file</dd>
50 * <dd>identifies a remote resource</dd>
52 * <dd>use a validating parser</dd>
53 * <dt>reloadChanges</dt>
54 * <dd>enables monitoring of resources for changes</dd>
57 * @param e DOM to supply configuration
59 ReloadableXMLFile(const xercesc::DOMElement* e);
61 virtual ~ReloadableXMLFile() {
66 * Loads configuration material.
68 * <p>This method is called to load configuration material
69 * initially and any time a change is detected. The base version
70 * performs basic parsing duties and returns the result.
72 * @return a pair consisting of a flag indicating whether to take ownership of
73 * the document, and the root element of the tree to load
75 virtual std::pair<bool,xercesc::DOMElement*> load();
78 * Overrideable method to determine whether a remote resource remains valid.
80 * @return true iff the resource remains valid and should not be reloaded
82 virtual bool isValid() const {
86 /** Root of the original DOM element passed into constructor. */
87 const xercesc::DOMElement* m_root;
89 /** Indicates whether resources is local or remote. */
92 /** Use a validating parser when parsing XML. */
95 /** Resource location, may be a local path or a URI. */
98 /** Last modification of local resource. */
101 /** Shared lock for guarding reloads. */
115 #endif /* __xmltooling_reloadable_h__ */