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1   /*
2    * $Id: VelocityStrutsUtil.java 451544 2006-09-30 05:38:02Z mrdon $
3    *
4    * Copyright 2006 The Apache Software Foundation.
5    *
6    * Licensed under the Apache License, Version 2.0 (the "License");
7    * you may not use this file except in compliance with the License.
8    * You may obtain a copy of the License at
9    *
10   *      http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.struts2.util;
19  
20  import java.io.CharArrayWriter;
21  import java.io.IOException;
22  
23  import javax.servlet.http.HttpServletRequest;
24  import javax.servlet.http.HttpServletResponse;
25  
26  import org.apache.struts2.views.velocity.VelocityManager;
27  import org.apache.velocity.context.Context;
28  import org.apache.velocity.exception.MethodInvocationException;
29  import org.apache.velocity.exception.ParseErrorException;
30  import org.apache.velocity.exception.ResourceNotFoundException;
31  
32  import com.opensymphony.xwork2.util.ValueStack;
33  
34  
35  /***
36   * Struts velocity related util.
37   *
38   */
39  public class VelocityStrutsUtil extends StrutsUtil {
40  
41      private Context ctx;
42  
43      public VelocityStrutsUtil(Context ctx, ValueStack stack, HttpServletRequest request, HttpServletResponse response) {
44          super(stack, request, response);
45          this.ctx = ctx;
46      }
47  
48      public String evaluate(String expression) throws IOException, ResourceNotFoundException, MethodInvocationException, ParseErrorException {
49          CharArrayWriter writer = new CharArrayWriter();
50          VelocityManager.getInstance().getVelocityEngine().evaluate(ctx, writer, "Error parsing " + expression, expression);
51  
52          return writer.toString();
53      }
54  
55  }