1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
12   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
14   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
15   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17   * SOFTWARE.
18   */
19  
20  package com.liferay.portal.velocity;
21  
22  import com.liferay.portal.kernel.util.Validator;
23  
24  import java.io.StringWriter;
25  
26  import java.util.Iterator;
27  import java.util.Map;
28  
29  import org.apache.velocity.VelocityContext;
30  import org.apache.velocity.app.Velocity;
31  
32  /**
33   * <a href="VelocityUtil.java.html"><b><i>View Source</i></b></a>
34   *
35   * @author Brian Wing Shun Chan
36   *
37   */
38  public class VelocityUtil {
39  
40      public static String evaluate(String input) throws Exception {
41          return evaluate(input, null);
42      }
43  
44      public static String evaluate(String input, Map<String, Object> variables)
45          throws Exception {
46  
47          Velocity.init();
48  
49          VelocityContext vc = new VelocityContext();
50  
51          if (variables != null) {
52              Iterator<Map.Entry<String, Object>> itr =
53                  variables.entrySet().iterator();
54  
55              while (itr.hasNext()) {
56                  Map.Entry<String, Object> entry = itr.next();
57  
58                  String key = entry.getKey();
59                  Object value = entry.getValue();
60  
61                  if (Validator.isNotNull(key)) {
62                      vc.put(key, value);
63                  }
64              }
65          }
66  
67          StringWriter output = new StringWriter();
68  
69          Velocity.evaluate(vc, output, VelocityUtil.class.getName(), input);
70  
71          return output.toString();
72      }
73  
74  }