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    1   /*
    2    * $Id: VelocityStrutsUtil.java 474191 2006-11-13 08:30:40Z mrdon $
    3    *
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "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  /***
    40   * Struts velocity related util.
    41   *
    42   */
    43  public class VelocityStrutsUtil extends StrutsUtil {
    44
    45      private Context ctx;
    46      private VelocityEngine velocityEngine;
    47
    48      public VelocityStrutsUtil(VelocityEngine engine, Context ctx, ValueStack stack, HttpServletRequest request, HttpServletResponse response) {
    49          super(stack, request, response);
    50          this.ctx = ctx;
    51          this.velocityEngine = engine;
    52      }
    53
    54      public String evaluate(String expression) throws IOException, ResourceNotFoundException, MethodInvocationException, ParseErrorException {
    55          CharArrayWriter writer = new CharArrayWriter();
    56          velocityEngine.evaluate(ctx, writer, "Error parsing " + expression, expression);
    57
    58          return writer.toString();
    59      }
    60
    61  }