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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   /*
   54    * 22 October 1999: This class added by Holger Arendt.
   55    */
   56   
   57   package freemarker.core;
   58   
   59   import java.util.ArrayList;
   60   import java.util.List;
   61   import java.io.Writer;
   62   import freemarker.template;
   63   import java.io.IOException;
   64   
   65   
   66   /**
   67    * A unary operator that calls a TemplateMethodModel.  It associates with the
   68    * <tt>Identifier</tt> or <tt>Dot</tt> to its left.
   69    */
   70   final class MethodCall extends Expression {
   71   
   72       private final Expression target;
   73       private final ListLiteral arguments;
   74   
   75       MethodCall(Expression target, ArrayList arguments) {
   76           this(target, new ListLiteral(arguments));
   77       }
   78   
   79       private MethodCall(Expression target, ListLiteral arguments) {
   80           this.target = target;
   81           this.arguments = arguments;
   82       }
   83   
   84       TemplateModel _getAsTemplateModel(Environment env) throws TemplateException
   85       {
   86           TemplateModel targetModel = target.getAsTemplateModel(env);
   87           if (targetModel instanceof TemplateMethodModel) {
   88               TemplateMethodModel targetMethod = (TemplateMethodModel)targetModel;
   89               List argumentStrings = 
   90               targetMethod instanceof TemplateMethodModelEx
   91               ? arguments.getModelList(env)
   92               : arguments.getValueList(env);
   93               Object result = targetMethod.exec(argumentStrings);
   94               return env.getObjectWrapper().wrap(result);
   95           }
   96           else if (targetModel instanceof Macro) {
   97               Macro func = (Macro) targetModel;
   98               env.setLastReturnValue(null);
   99               if (!func.isFunction) {
  100                   throw new TemplateException("A macro cannot be called in an expression.", env);
  101               }
  102               Writer prevOut = env.getOut();
  103               try {
  104                   env.setOut(Environment.NULL_WRITER);
  105                   env.visit(func, null, arguments.values, null, null);
  106               } catch (IOException ioe) {
  107                   throw new InternalError("This should be impossible.");
  108               } finally {
  109                   env.setOut(prevOut);
  110               }
  111               return env.getLastReturnValue();
  112           }
  113           else {
  114               throw invalidTypeException(targetModel, target, env, "method");
  115           }
  116       }
  117   
  118       public String getCanonicalForm() {
  119           StringBuffer buf = new StringBuffer();
  120           buf.append(target.getCanonicalForm());
  121           buf.append("(");
  122           String list = arguments.getCanonicalForm();
  123           buf.append(list.substring(1, list.length() -1));
  124           buf.append(")");
  125           return buf.toString();
  126       }
  127   
  128       TemplateModel getConstantValue() {
  129           return null;
  130       }
  131   
  132       boolean isLiteral() {
  133           return false;
  134       }
  135   
  136       Expression _deepClone(String name, Expression subst) {
  137           return new MethodCall(target.deepClone(name, subst), (ListLiteral)arguments.deepClone(name, subst));
  138       }
  139   
  140   }

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