|
1
25 package org.ofbiz.webapp.view;
26
27 import java.util.HashMap  ;
28 import java.util.Map ;
29 import java.util.List ;
30 import java.util.Iterator ;
31 import javax.servlet.ServletContext ;
32
33 import org.ofbiz.base.util.Debug;
34 import org.ofbiz.base.util.ObjectType;
35 import org.ofbiz.base.util.GeneralRuntimeException;
36 import org.ofbiz.webapp.control.RequestHandler;
37 import org.ofbiz.webapp.control.RequestManager;
38
39
46 public class ViewFactory {
47
48 public static final String module = ViewFactory.class.getName();
49
50 protected RequestHandler requestHandler = null;
51 protected RequestManager requestManager = null;
52 protected ServletContext context = null;
53 protected Map handlers = null;
54
55 public ViewFactory(RequestHandler requestHandler) {
56 this.handlers = new HashMap ();
57 this.requestHandler = requestHandler;
58 this.requestManager = requestHandler.getRequestManager();
59 this.context = requestHandler.getServletContext();
60
61 try {
63 this.preLoadAll();
64 } catch (ViewHandlerException e) {
65 Debug.logError(e, module);
66 throw new GeneralRuntimeException(e);
67 }
68 }
69
70 private void preLoadAll() throws ViewHandlerException {
71 List handlers = requestManager.getHandlerKeys(RequestManager.VIEW_HANDLER_KEY);
72 if (handlers != null) {
73 Iterator i = handlers.iterator();
74 while (i.hasNext()) {
75 String type = (String ) i.next();
76 this.handlers.put(type, this.loadViewHandler(type));
77 }
78 }
79
80 if (!this.handlers.containsKey("default")) {
82 try {
83 ViewHandler h = (ViewHandler) ObjectType.getInstance("org.ofbiz.webapp.view.JspViewHandler");
84 h.init(context);
85 this. handlers.put("default", h);
86 } catch (Exception e) {
87 throw new ViewHandlerException(e);
88 }
89 }
90 }
91
92 public ViewHandler getViewHandler(String type) throws ViewHandlerException {
93 if (type == null || type.length() == 0) {
94 type = "default";
95 }
96
97 if (handlers.size() == 0) {
99 this.preLoadAll();
100 }
101
102 ViewHandler handler = (ViewHandler) handlers.get(type);
104
105 if (handler == null) {
107 synchronized (ViewFactory.class) {
108 handler = (ViewHandler) handlers.get(type);
109 if (handler == null) {
110 handler = this.loadViewHandler(type);
111 handlers.put(type, handler);
112 }
113 }
114 if (handler == null) {
115 throw new ViewHandlerException("No handler found for type: " + type);
116 }
117 }
118 return handler;
119 }
120
121 public void clear() {
122 handlers.clear();
123 }
124
125 private ViewHandler loadViewHandler(String type) throws ViewHandlerException {
126 ViewHandler handler = null;
127 String handlerClass = requestManager.getHandlerClass(type, RequestManager.VIEW_HANDLER_KEY);
128 if (handlerClass == null)
129 throw new ViewHandlerException("Unknown handler type: " + type);
130
131 try {
132 handler = (ViewHandler) ObjectType.getInstance(handlerClass);
133 handler.init(context);
134 } catch (ClassNotFoundException cnf) {
135 Debug.logWarning("Warning: could not load view handler class because it was not found; note that some views may not work: " + cnf.toString(), module);
137 } catch (InstantiationException ie) {
138 throw new ViewHandlerException("Cannot get instance of the handler", ie);
139 } catch (IllegalAccessException iae) {
140 throw new ViewHandlerException(iae.getMessage(), iae);
141 }
142
143 return handler;
144 }
145 }
146 |
Popular Tags |
Java API By Example, From Geeks To Geeks.