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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    * 
    9    *      http://www.apache.org/licenses/LICENSE-2.0
   10    * 
   11    * Unless required by applicable law or agreed to in writing, software
   12    * distributed under the License is distributed on an "AS IS" BASIS,
   13    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   14    * See the License for the specific language governing permissions and
   15    * limitations under the License.
   16    */
   17   
   18   
   19   package org.apache.struts2.jasper.tagplugins.jstl.core;
   20   
   21   import org.apache.struts2.jasper.compiler.tagplugin.TagPlugin;
   22   import org.apache.struts2.jasper.compiler.tagplugin.TagPluginContext;
   23   
   24   public final class When implements TagPlugin {
   25   
   26       public void doTag(TagPluginContext ctxt) {
   27           // Get the parent context to determine if this is the first <c:when>
   28           TagPluginContext parentContext = ctxt.getParentContext();
   29           if (parentContext == null) {
   30               ctxt.dontUseTagPlugin();
   31               return;
   32           }
   33   
   34           if ("true".equals(parentContext.getPluginAttribute("hasBeenHere"))) {
   35               ctxt.generateJavaSource("} else if(");
   36               // See comment below for the reason we generate the extra "}" here.
   37           } else {
   38               ctxt.generateJavaSource("if(");
   39               parentContext.setPluginAttribute("hasBeenHere", "true");
   40           }
   41           ctxt.generateAttribute("test");
   42           ctxt.generateJavaSource("){");
   43           ctxt.generateBody();
   44   
   45           // We don't generate the closing "}" for the "if" here because there
   46           // may be whitespaces in between <c:when>'s.  Instead we delay
   47           // generating it until the next <c:when> or <c:otherwise> or
   48           // <c:choose>
   49       }
   50   }

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