1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    *
5    *
6    *
7    * The contents of this file are subject to the terms of the Liferay Enterprise
8    * Subscription License ("License"). You may not use this file except in
9    * compliance with the License. You can obtain a copy of the License by
10   * contacting Liferay, Inc. See the License for the specific language governing
11   * permissions and limitations under the License, including but not limited to
12   * distribution rights of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.velocity;
24  
25  import com.liferay.portal.kernel.io.unsync.UnsyncStringWriter;
26  import com.liferay.portal.kernel.util.Validator;
27  
28  import java.util.Iterator;
29  import java.util.Map;
30  
31  import org.apache.velocity.VelocityContext;
32  import org.apache.velocity.app.Velocity;
33  
34  /**
35   * <a href="VelocityUtil.java.html"><b><i>View Source</i></b></a>
36   *
37   * @author Brian Wing Shun Chan
38   */
39  public class VelocityUtil {
40  
41      public static String evaluate(String input) throws Exception {
42          return evaluate(input, null);
43      }
44  
45      public static String evaluate(String input, Map<String, Object> variables)
46          throws Exception {
47  
48          Velocity.init();
49  
50          VelocityContext velocityContext = new VelocityContext();
51  
52          if (variables != null) {
53              Iterator<Map.Entry<String, Object>> itr =
54                  variables.entrySet().iterator();
55  
56              while (itr.hasNext()) {
57                  Map.Entry<String, Object> entry = itr.next();
58  
59                  String key = entry.getKey();
60                  Object value = entry.getValue();
61  
62                  if (Validator.isNotNull(key)) {
63                      velocityContext.put(key, value);
64                  }
65              }
66          }
67  
68          UnsyncStringWriter unsyncStringWriter = new UnsyncStringWriter(true);
69  
70          Velocity.evaluate(
71              velocityContext, unsyncStringWriter, VelocityUtil.class.getName(),
72              input);
73  
74          return unsyncStringWriter.toString();
75      }
76  
77  }