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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.io.IOException;
   56   import freemarker.template;
   57   
   58   /**
   59    * An element that represents a conditionally executed block.
   60    * @author <A HREF="mailto:jon@revusky.com">Jonathan Revusky</A>
   61    */
   62   
   63   final class ConditionalBlock extends TemplateElement {
   64   
   65       final Expression condition;
   66       private final boolean isFirst;
   67       boolean isSimple;
   68   
   69       ConditionalBlock(Expression condition, TemplateElement nestedBlock, boolean isFirst)
   70       {
   71           this.condition = condition;
   72           this.nestedBlock = nestedBlock;
   73           this.isFirst = isFirst;
   74       }
   75   
   76       void accept(Environment env) throws TemplateException, IOException {
   77           if (condition == null || condition.isTrue(env)) {
   78               if (nestedBlock != null) {
   79                   env.visit(nestedBlock);
   80               }
   81           }
   82       }
   83   
   84       public String getCanonicalForm() {
   85           StringBuffer buf = new StringBuffer();
   86           if (condition == null) {
   87               buf.append("<#else");
   88           }
   89           else if (isFirst) {
   90               buf.append("<#if ");
   91           }
   92           else {
   93               buf.append("<#elseif ");
   94           }
   95           if (condition != null) {
   96               buf.append(condition.getCanonicalForm());
   97           }
   98           buf.append(">");
   99           if (nestedBlock != null) {
  100               buf.append(nestedBlock.getCanonicalForm());
  101           }
  102           if (isSimple) {
  103               buf.append("</#if>");
  104           }
  105           return buf.toString();
  106       }
  107   
  108       public String getDescription() {
  109           String s = "if ";
  110           if (condition == null) {
  111               s = "else ";
  112           } 
  113           else if (!isFirst) {
  114               s = "elseif ";
  115           }
  116           String cond = condition != null ? condition.toString() : "";
  117           return s + cond;
  118       }
  119   }

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