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1
48
49 package com.caucho.portal.generic;
50
51 import javax.portlet.PortletException;
52 import javax.servlet.ServletConfig  ;
53 import javax.servlet.ServletException ;
54 import javax.servlet.http.HttpServlet ;
55 import javax.servlet.http.HttpServletRequest ;
56 import javax.servlet.http.HttpServletResponse ;
57 import java.io.IOException ;
58 import java.lang.reflect.Constructor ;
59 import java.lang.reflect.Modifier ;
60 import java.util.logging.Logger ;
61
62
80 public class GenericPortalServlet
81 extends HttpServlet
82 {
83 static protected final Logger log =
84 Logger.getLogger(GenericPortalServlet.class.getName());
85
86 private Portal _portal;
87 private HttpPortletContext _portletContext;
88
89 private GenericLayoutWindow _layout;
90
91
94 public void setPortal(Portal portal)
95 {
96 if (_portal != null)
97 throw new IllegalArgumentException ("`portal' already set");
98
99 _portal = portal;
100 }
101
102
106 public void setPortalClass(String className)
107 {
108 setPortal( (Portal) newInstance(Portal.class, className) );
109 }
110
111
116 public void setLayout(GenericLayoutWindow layout)
117 {
118 if (_layout != null)
119 throw new IllegalArgumentException ("`layout' is already set");
120
121 _layout = layout;
122 }
123
124
125
129 public void setLayoutClass(String className)
130 {
131 setLayout( (GenericLayoutWindow) newInstance( GenericLayoutWindow.class,
132 className ) );
133 }
134
135 public void init(ServletConfig servletConfig)
136 throws ServletException
137 {
138 super.init(servletConfig);
139
140 String p;
141
142 p = super.getInitParameter("portal-class");
143 if (p != null)
144 setPortalClass( p );
145
146 if (_portal == null)
147 _portal = new GenericPortal();
148
149 p = super.getInitParameter("layout-class");
150 if (p != null)
151 setLayoutClass( p );
152
153 if (_layout == null)
154 throw new ServletException ("`layout' is required");
155
156 _portletContext = new HttpPortletContext(getServletContext());
157
158 try {
159 _layout.init(_portletContext);
160 }
161 catch (PortletException ex) {
162 throw new ServletException (ex);
163 }
164 }
165
166 protected Object newInstance(Class targetClass, String className)
167 throws IllegalArgumentException
168 {
169 Class cl = null;
170
171 ClassLoader loader = Thread.currentThread().getContextClassLoader();
172
173 try {
174 cl = Class.forName(className, false, loader);
175 } catch (ClassNotFoundException e) {
176 }
177
178 if (cl == null)
179 throw new IllegalArgumentException (
180 "`" + className + "' is not a known class");
181
182 if (!targetClass.isAssignableFrom(cl))
183 throw new IllegalArgumentException (
184 "'" + className + "' must implement " + targetClass.getName());
185
186 if (Modifier.isAbstract(cl.getModifiers()))
187 throw new IllegalArgumentException (
188 "'" + className + "' must not be abstract.");
189
190 if (!Modifier.isPublic(cl.getModifiers()))
191 throw new IllegalArgumentException (
192 "'" + className + "' must be public.");
193
194 Constructor []constructors = cl.getDeclaredConstructors();
195
196 Constructor zeroArg = null;
197 for (int i = 0; i < constructors.length; i++) {
198 if (constructors[i].getParameterTypes().length == 0) {
199 zeroArg = constructors[i];
200 break;
201 }
202 }
203
204 if (zeroArg == null || !Modifier.isPublic(zeroArg.getModifiers()))
205 throw new IllegalArgumentException (
206 "'" + className + "' must have a public zero arg constructor");
207
208 Object obj = null;
209
210 try {
211 obj = cl.newInstance();
212 }
213 catch (Exception ex) {
214 throw new IllegalArgumentException (
215 "error instantiating `" + className + "': " + ex.toString(), ex);
216 }
217
218 return obj;
219 }
220
221 protected void doGet(HttpServletRequest req, HttpServletResponse res)
222 throws ServletException , IOException
223 {
224 doRequest(req, res);
225 }
226
227 protected void doPost(HttpServletRequest req, HttpServletResponse res)
228 throws ServletException , IOException
229 {
230 doRequest(req, res);
231 }
232
233 protected void doRequest(HttpServletRequest httpRequest,
234 HttpServletResponse httpResponse)
235 throws ServletException , IOException
236 {
237 HttpPortletConnection connection = new HttpPortletConnection();
238 connection.start(_portal, _portletContext, httpRequest, httpResponse, true);
239
240 try {
241 _layout.processAction(connection);
242 _layout.render(connection);
243 connection.checkForFailure();
244 }
245 catch (PortletException ex) {
246 throw new ServletException (ex);
247 }
248 finally {
249 connection.finish();
250 }
251 }
252
253 protected void doRequest(PortletConnection connection)
254 throws PortletException, IOException
255 {
256 }
257 public void destroy()
258 {
259 if (_layout != null)
260 _layout.destroy();
261 }
262 }
263
264 |
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