SelectModule xref

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    1   /*
    2    * $Id: SelectModule.java 471754 2006-11-06 14:55:09Z husted $
    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.struts.chain.commands.servlet;
    22
    23  import org.apache.struts.Globals;
    24  import org.apache.struts.chain.Constants;
    25  import org.apache.struts.chain.commands.AbstractSelectModule;
    26  import org.apache.struts.chain.contexts.ActionContext;
    27  import org.apache.struts.chain.contexts.ServletActionContext;
    28
    29  import javax.servlet.http.HttpServletRequest;
    30
    31  /**
    32   * <p>Cache the <code>ModuleConfig</code> and <code>MessageResources</code>
    33   * instances for the sub-application module to be used for processing this
    34   * request.</p>
    35   *
    36   * @version $Rev: 471754 $ $Date: 2005-06-04 10:58:46 -0400 (Sat, 04 Jun 2005)
    37   *          $
    38   */
    39  public class SelectModule extends AbstractSelectModule {
    40      // ------------------------------------------------------- Protected Methods
    41      protected String getPrefix(ActionContext context) {
    42          // Identify the URI from which we will match a module prefix
    43          ServletActionContext sacontext = (ServletActionContext) context;
    44          HttpServletRequest request = sacontext.getRequest();
    45          String uri =
    46              (String) request.getAttribute(Constants.INCLUDE_SERVLET_PATH);
    47
    48          if (uri == null) {
    49              uri = request.getServletPath();
    50          }
    51
    52          if (uri == null) {
    53              throw new IllegalArgumentException("No path information in request");
    54          }
    55
    56          // Identify the module prefix for the current module
    57          String prefix = ""; // Initialize to default prefix
    58          String[] prefixes =
    59              (String[]) sacontext.getApplicationScope().get(Globals.MODULE_PREFIXES_KEY);
    60          int lastSlash = 0;
    61
    62          while (prefix.equals("") && ((lastSlash = uri.lastIndexOf("/")) > 0)) {
    63              uri = uri.substring(0, lastSlash);
    64
    65              for (int i = 0; i < prefixes.length; i++) {
    66                  if (uri.equals(prefixes[i])) {
    67                      prefix = prefixes[i];
    68
    69                      break;
    70                  }
    71              }
    72          }
    73
    74          return (prefix);
    75      }
    76  }