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    1   package org.apache.turbine.pipeline;
    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 java.io.IOException;
    25
    26  import org.apache.commons.logging.Log;
    27  import org.apache.commons.logging.LogFactory;
    28  import org.apache.turbine.util.RunData;
    29  import org.apache.turbine.util.TurbineException;
    30  import org.apache.turbine.util.uri.URIConstants;
    31
    32  /**
    33   * This valve is responsible for setting the 'target' property of the RunData.
    34   * If it is not already set it attempts to get the target from the request
    35   * parameter 'template'. If the parameter is not set, we use the homepage
    36   * specified by the configuration property Turbine.TEMPLATE_HOMEPAGE.
    37   *
    38   * FIXME: The request parameter which determines the template should be
    39   *        configurable.
    40   *
    41   * @author <a href="mailto:james@jamestaylor.org">James Taylor</a>
    42   * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
    43   */
    44  public class DetermineTargetValve
    45      extends AbstractValve
    46  {
    47      private static final Log log
    48          = LogFactory.getLog(DetermineTargetValve.class);
    49
    50      /**
    51       * @see org.apache.turbine.pipeline.Valve#invoke(PipelineData, ValveContext)
    52       */
    53      public void invoke(PipelineData pipelineData, ValveContext context)
    54          throws IOException, TurbineException
    55      {
    56          RunData runData = getRunData(pipelineData);
    57          if (! runData.hasScreen())
    58          {
    59              String target = runData.getParameters().getString(URIConstants.CGI_SCREEN_PARAM);
    60
    61              if (target != null)
    62              {
    63                  runData.setScreen(target);
    64
    65                  log.debug("Set screen target from request parameter");
    66              }
    67              else
    68              {
    69              /*    data.setScreen(Turbine.getConfiguration().getString(
    70                      Turbine.TEMPLATE_HOMEPAGE));
    71
    72                  log.debug("Set target using default value");
    73                  */
    74  				log.debug("No target screen");
    75              }
    76
    77          }
    78
    79          if (log.isDebugEnabled())
    80          {
    81              log.debug("Screen Target is now: " + runData.getScreen());
    82          }
    83
    84          // Pass control to the next Valve in the Pipeline
    85          context.invokeNext(pipelineData);
    86      }
    87  }