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    1   package org.apache.turbine.util.velocity;
    2
    3
    4   /*
    5    * Licensed to the Apache Software Foundation (ASF) under one
    6    * or more contributor license agreements.  See the NOTICE file
    7    * distributed with this work for additional information
    8    * regarding copyright ownership.  The ASF licenses this file
    9    * to you under the Apache License, Version 2.0 (the
    10   * "License"); you may not use this file except in compliance
    11   * with the License.  You may obtain a copy of the License at
    12   *
    13   *   http://www.apache.org/licenses/LICENSE-2.0
    14   *
    15   * Unless required by applicable law or agreed to in writing,
    16   * software distributed under the License is distributed on an
    17   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    18   * KIND, either express or implied.  See the License for the
    19   * specific language governing permissions and limitations
    20   * under the License.
    21   */
    22
    23
    24  import org.apache.fulcrum.parser.ParameterParser;
    25  import org.apache.turbine.Turbine;
    26  import org.apache.turbine.modules.ActionEvent;
    27  import org.apache.turbine.pipeline.PipelineData;
    28  import org.apache.turbine.services.velocity.TurbineVelocity;
    29  import org.apache.velocity.context.Context;
    30
    31  /**
    32   * If you are using VelocitySite stuff, then your Action's should
    33   * extend this class instead of extending the ActionEvent class.  The
    34   * difference between this class and the ActionEvent class is that
    35   * this class will first attempt to execute one of your doMethod's
    36   * with a constructor like this:
    37   *
    38   * <p><code>doEvent(RunData data, Context context)</code></p>
    39   *
    40   * <p>It gets the context from the TemplateInfo.getTemplateContext()
    41   * method. If it can't find a method like that, then it will try to
    42   * execute the method without the Context in it.</p>
    43   *
    44   * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
    45   * @author <a href="mailto:jvanzyl@periapt.com">Jason van Zyl</a>
    46   * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
    47   * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
    48   * @version $Id: VelocityActionEvent.java 1706425 2015-10-02 14:47:51Z tv $
    49   */
    50  public abstract class VelocityActionEvent extends ActionEvent
    51  {
    52      /** Indicates whether or not this module has been initialized. */
    53      protected boolean initialized = false;
    54
    55      /**
    56       * Provides a means of initializing the module.
    57       *
    58       * @throws Exception a generic exception.
    59       */
    60      protected abstract void initialize()
    61          throws Exception;
    62
    63      /**
    64       * This overrides the default Action.doPerform() to execute the
    65       * doEvent() method.  If that fails, then it will execute the
    66       * doPerform() method instead.
    67       *
    68       * @param pipelineData A Turbine RunData object.
    69       * @exception Exception a generic exception.
    70       */
    71      @Override
    72      public void doPerform(PipelineData pipelineData)
    73              throws Exception
    74      {
    75          if (!initialized)
    76          {
    77              initialize();
    78          }
    79
    80          ParameterParser pp = pipelineData.get(Turbine.class, ParameterParser.class);
    81          Context context = TurbineVelocity.getContext(pipelineData);
    82          executeEvents(pp, new Class<?>[]{ PipelineData.class, Context.class },
    83                  new Object[]{ pipelineData, context });
    84      }
    85  }