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    1   /*
    2    * Copyright (c) 2003 The Visigoth Software Society. All rights
    3    * reserved.
    4    *
    5    * Redistribution and use in source and binary forms, with or without
    6    * modification, are permitted provided that the following conditions
    7    * are met:
    8    *
    9    * 1. Redistributions of source code must retain the above copyright
   10    *    notice, this list of conditions and the following disclaimer.
   11    *
   12    * 2. Redistributions in binary form must reproduce the above copyright
   13    *    notice, this list of conditions and the following disclaimer in
   14    *    the documentation and/or other materials provided with the
   15    *    distribution.
   16    *
   17    * 3. The end-user documentation included with the redistribution, if
   18    *    any, must include the following acknowledgement:
   19    *       "This product includes software developed by the
   20    *        Visigoth Software Society (http://www.visigoths.org/)."
   21    *    Alternately, this acknowledgement may appear in the software itself,
   22    *    if and wherever such third-party acknowledgements normally appear.
   23    *
   24    * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the 
   25    *    project contributors may be used to endorse or promote products derived
   26    *    from this software without prior written permission. For written
   27    *    permission, please contact visigoths@visigoths.org.
   28    *
   29    * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
   30    *    nor may "FreeMarker" or "Visigoth" appear in their names
   31    *    without prior written permission of the Visigoth Software Society.
   32    *
   33    * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   34    * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   35    * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   36    * DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
   37    * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   38    * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   39    * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   40    * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   41    * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   42    * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   43    * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   44    * SUCH DAMAGE.
   45    * ====================================================================
   46    *
   47    * This software consists of voluntary contributions made by many
   48    * individuals on behalf of the Visigoth Software Society. For more
   49    * information on the Visigoth Software Society, please see
   50    * http://www.visigoths.org/
   51    */
   52   
   53   package freemarker.core;
   54   
   55   import java.util.ArrayList;
   56   import java.io.IOException;
   57   import freemarker.template.TemplateException;
   58   
   59   /**
   60    * A instruction that handles if-elseif-else blocks.
   61    * @author <A HREF="mailto:jon@revusky.com">Jonathan Revusky</A>
   62    */
   63   
   64   final class IfBlock extends TemplateElement {
   65   
   66       IfBlock(ConditionalBlock block)
   67       {
   68           nestedElements = new ArrayList();
   69           addBlock(block);
   70       }
   71   
   72       void addBlock(ConditionalBlock block) {
   73           nestedElements.add(block);
   74       }
   75   
   76       void accept(Environment env) throws TemplateException, IOException {
   77           for (int i = 0; i<nestedElements.size(); i++) {
   78               ConditionalBlock cblock = (ConditionalBlock) nestedElements.get(i);
   79               Expression condition = cblock.condition;
   80               if (condition == null || condition.isTrue(env)) {
   81                   if (cblock.nestedBlock != null) {
   82                       env.visit(cblock.nestedBlock);
   83                   }
   84                   return;
   85               }
   86           }
   87       }
   88   
   89       public String getCanonicalForm() {
   90           StringBuffer buf = new StringBuffer();
   91           for (int i = 0; i<nestedElements.size(); i++) {
   92               ConditionalBlock cblock = (ConditionalBlock) nestedElements.get(i);
   93               buf.append(cblock.getCanonicalForm());
   94           }
   95           buf.append("</#if>");
   96           return buf.toString();
   97       }
   98   
   99       TemplateElement postParseCleanup(boolean stripWhitespace)
  100           throws ParseException 
  101       {
  102           if (nestedElements.size() == 1) {
  103               ConditionalBlock cblock = (ConditionalBlock) nestedElements.get(0);
  104               cblock.isSimple = true;
  105               cblock.setLocation(getTemplate(), cblock, this);
  106               return cblock.postParseCleanup(stripWhitespace);
  107           }
  108           else {
  109               return super.postParseCleanup(stripWhitespace);
  110           }
  111       }
  112   
  113       public String getDescription() {
  114           return "if-else ";
  115       }
  116   }

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