01: /*
02: * $Id: VelocityStrutsUtil.java 474191 2006-11-13 08:30:40Z mrdon $
03: *
04: * Licensed to the Apache Software Foundation (ASF) under one
05: * or more contributor license agreements. See the NOTICE file
06: * distributed with this work for additional information
07: * regarding copyright ownership. The ASF licenses this file
08: * to you under the Apache License, Version 2.0 (the
09: * "License"); you may not use this file except in compliance
10: * with the License. You may obtain a copy of the License at
11: *
12: * http://www.apache.org/licenses/LICENSE-2.0
13: *
14: * Unless required by applicable law or agreed to in writing,
15: * software distributed under the License is distributed on an
16: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17: * KIND, either express or implied. See the License for the
18: * specific language governing permissions and limitations
19: * under the License.
20: */
21: package org.apache.struts2.util;
22:
23: import java.io.CharArrayWriter;
24: import java.io.IOException;
25:
26: import javax.servlet.http.HttpServletRequest;
27: import javax.servlet.http.HttpServletResponse;
28:
29: import org.apache.struts2.views.velocity.VelocityManager;
30: import org.apache.velocity.app.VelocityEngine;
31: import org.apache.velocity.context.Context;
32: import org.apache.velocity.exception.MethodInvocationException;
33: import org.apache.velocity.exception.ParseErrorException;
34: import org.apache.velocity.exception.ResourceNotFoundException;
35:
36: import com.opensymphony.xwork2.util.ValueStack;
37:
38: /**
39: * Struts velocity related util.
40: *
41: */
42: public class VelocityStrutsUtil extends StrutsUtil {
43:
44: private Context ctx;
45: private VelocityEngine velocityEngine;
46:
47: public VelocityStrutsUtil(VelocityEngine engine, Context ctx,
48: ValueStack stack, HttpServletRequest request,
49: HttpServletResponse response) {
50: super (stack, request, response);
51: this .ctx = ctx;
52: this .velocityEngine = engine;
53: }
54:
55: public String evaluate(String expression) throws IOException,
56: ResourceNotFoundException, MethodInvocationException,
57: ParseErrorException {
58: CharArrayWriter writer = new CharArrayWriter();
59: velocityEngine.evaluate(ctx, writer, "Error parsing "
60: + expression, expression);
61:
62: return writer.toString();
63: }
64:
65: }
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