001 package org.apache.turbine.util.velocity;
002
003
004 /*
005 * Licensed to the Apache Software Foundation (ASF) under one
006 * or more contributor license agreements. See the NOTICE file
007 * distributed with this work for additional information
008 * regarding copyright ownership. The ASF licenses this file
009 * to you under the Apache License, Version 2.0 (the
010 * "License"); you may not use this file except in compliance
011 * with the License. You may obtain a copy of the License at
012 *
013 * http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing,
016 * software distributed under the License is distributed on an
017 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
018 * KIND, either express or implied. See the License for the
019 * specific language governing permissions and limitations
020 * under the License.
021 */
022
023 import org.apache.commons.lang.StringUtils;
024 import org.apache.commons.lang.WordUtils;
025 import org.apache.commons.logging.Log;
026 import org.apache.commons.logging.LogFactory;
027 import org.apache.commons.mail.EmailException;
028 import org.apache.commons.mail.SimpleEmail;
029 import org.apache.turbine.Turbine;
030 import org.apache.turbine.TurbineConstants;
031 import org.apache.turbine.services.velocity.TurbineVelocity;
032 import org.apache.velocity.context.Context;
033
034 /**
035 * This is a simple class for sending email from within Velocity.
036 * Essentially, the body of the email is processed with a
037 * Velocity Context object.
038 * The beauty of this is that you can send email from within your
039 * Velocity template or from your business logic in your Java code.
040 * The body of the email is just a Velocity template so you can use
041 * all the template functionality of Velocity within your emails!
042 *
043 * <p>Example Usage (This all needs to be on one line in your
044 * template):
045 *
046 * <p>Setup your context:
047 *
048 * <p><code>context.put ("VelocityEmail", new VelocityEmail() );</code>
049 *
050 * <p>Then, in your template:
051 *
052 * <pre>
053 * $VelocityEmail.setTo("Jon Stevens", "jon@latchkey.com")
054 * .setFrom("Mom", "mom@mom.com").setSubject("Eat dinner")
055 * .setTemplate("email/momEmail.vm")
056 * .setContext($context)
057 * </pre>
058 *
059 * The email/momEmail.wm template will then be parsed with the
060 * Context that was defined with setContext().
061 *
062 * <p>If you want to use this class from within your Java code all you
063 * have to do is something like this:
064 *
065 * <pre>
066 * VelocityEmail ve = new VelocityEmail();
067 * ve.setTo("Jon Stevens", "jon@latchkey.com");
068 * ve.setFrom("Mom", "mom@mom.com").setSubject("Eat dinner");
069 * ve.setContext(context);
070 * ve.setTemplate("email/momEmail.vm")
071 * ve.send();
072 * </pre>
073 *
074 * <p>(Note that when used within a Velocity template, the send method
075 * will be called for you when Velocity tries to convert the
076 * VelocityEmail to a string by calling toString()).</p>
077 *
078 * <p>If you need your email to be word-wrapped, you can add the
079 * following call to those above:
080 *
081 * <pre>
082 * ve.setWordWrap (60);
083 * </pre>
084 *
085 * <p>This class is just a wrapper around the SimpleEmail class from
086 * commons-mail using the JavaMail API.
087 * Thus, it depends on having the
088 * mail.server property set in the TurbineResources.properties file.
089 * If you want to use this class outside of Turbine for general
090 * processing that is also possible by making sure to set the path to
091 * the TurbineResources.properties. See the
092 * TurbineConfig class for more information.</p>
093 *
094 * <p>You can turn on debugging for the JavaMail API by calling
095 * setDebug(true). The debugging messages will be written to System.out.
096 *
097 * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
098 * @author <a href="mailto:gcoladonato@yahoo.com">Greg Coladonato</a>
099 * @author <a href="mailto:quintonm@bellsouth.net">Quinton McCombs</a>
100 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
101 * @version $Id: VelocityEmail.java 1078552 2011-03-06 19:58:46Z tv $
102 */
103 public class VelocityEmail extends SimpleEmail
104 {
105 /** Logging */
106 private static Log log = LogFactory.getLog(VelocityEmail.class);
107
108 /** The column to word-wrap at. <code>0</code> indicates no wrap. */
109 private int wordWrap = 0;
110
111 /** Address of outgoing mail server */
112 private String mailServer;
113
114 /** The template to process, relative to Velocity template directory. */
115 private String template = null;
116
117 /** Velocity context */
118 private Context context = null;
119
120 /**
121 * Constructor
122 */
123 public VelocityEmail()
124 {
125 super();
126 }
127
128 /**
129 * Constructor
130 */
131 public VelocityEmail(Context context)
132 {
133 this();
134 this.context = context;
135 }
136
137 /**
138 * To: toName, toEmail
139 *
140 * @param toName A String with the TO toName.
141 * @param toEmail A String with the TO toEmail.
142 * @deprecated use addTo(email,name) instead
143 * @throws EmailException email address could not be parsed
144 * @return A VelocityEmail (self).
145 */
146 @Deprecated
147 public VelocityEmail setTo(String toName, String toEmail)
148 throws EmailException
149 {
150 addTo(toEmail,toName);
151 return this;
152 }
153
154 /**
155 * Velocity template to execute. Path is relative to the Velocity
156 * templates directory.
157 *
158 * @param template relative path of the template to parse including the
159 * filename.
160 * @return A VelocityEmail (self).
161 */
162 public VelocityEmail setTemplate(String template)
163 {
164 this.template = template;
165 return this;
166 }
167
168 /**
169 * Set the column at which long lines of text should be word-
170 * wrapped. Setting to zero turns off word-wrap (default).
171 *
172 * NOTE: don't use tabs in your email template document,
173 * or your word-wrapping will be off for the lines with tabs
174 * in them.
175 *
176 * @param wordWrap The column at which to wrap long lines.
177 * @return A VelocityEmail (self).
178 */
179 public VelocityEmail setWordWrap(int wordWrap)
180 {
181 this.wordWrap = wordWrap;
182 return this;
183 }
184
185 /**
186 * Set the context object that will be merged with the
187 * template.
188 *
189 * @param context A Velocity context object.
190 * @return A VelocityEmail (self).
191 */
192 public VelocityEmail setContext(Context context)
193 {
194 this.context = context;
195 return this;
196 }
197
198 /**
199 * Get the context object that will be merged with the
200 * template.
201 *
202 * @return A Context (self).
203 */
204 public Context getContext()
205 {
206 return this.context;
207 }
208
209 /**
210 * Sets the address of the outgoing mail server. This method
211 * should be used when you need to override the value stored in
212 * TR.props.
213 *
214 * @param serverAddress host name of your outgoing mail server
215 */
216 public void setMailServer(String serverAddress)
217 {
218 this.mailServer = serverAddress;
219 }
220
221 /**
222 * Gets the host name of the outgoing mail server. If the server
223 * name has not been set by calling setMailServer(), the value
224 * from TR.props for mail.server will be returned. If TR.props
225 * has no value for mail.server, localhost will be returned.
226 *
227 * @return host name of the mail server.
228 */
229 public String getMailServer()
230 {
231 return StringUtils.isNotEmpty(mailServer) ? mailServer
232 : Turbine.getConfiguration().getString(
233 TurbineConstants.MAIL_SERVER_KEY,
234 TurbineConstants.MAIL_SERVER_DEFAULT);
235 }
236
237 /**
238 * This method sends the email.
239 * <p>If the mail server was not set by calling, setMailServer()
240 * the value of mail.server will be used from TR.props. If that
241 * value was not set, localhost is used.
242 *
243 * @throws EmailException Failure during merging the velocity
244 * template or sending the email.
245 */
246 @Override
247 public String send() throws EmailException
248 {
249 String body = null;
250 try
251 {
252 // Process the template.
253 body = TurbineVelocity.handleRequest(context, template);
254 }
255 catch (Exception e)
256 {
257 throw new EmailException(
258 "Could not render velocitty template", e);
259 }
260
261 // If the caller desires word-wrapping, do it here
262 if (wordWrap > 0)
263 {
264 body = WordUtils.wrap(body, wordWrap,
265 System.getProperty("line.separator"), false);
266 }
267
268 setMsg(body);
269 setHostName(getMailServer());
270 return super.send();
271 }
272
273 /**
274 * The method toString() calls send() for ease of use within a
275 * Velocity template (see example usage above).
276 *
277 * @return An empty string.
278 */
279 @Override
280 public String toString()
281 {
282 try
283 {
284 send();
285 }
286 catch (Exception e)
287 {
288 log.error("VelocityEmail error", e);
289 }
290 return "";
291 }
292 }