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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.ext.beans;
   54   
   55   import java.lang.reflect.InvocationTargetException;
   56   import java.lang.reflect.Method;
   57   import java.lang.reflect.Modifier;
   58   import java.util.List;
   59   
   60   import freemarker.template.SimpleNumber;
   61   import freemarker.template.TemplateMethodModelEx;
   62   import freemarker.template.TemplateModel;
   63   import freemarker.template.TemplateModelException;
   64   import freemarker.template.TemplateSequenceModel;
   65   import freemarker.template.utility.Collections12;
   66   
   67   /**
   68    * A class that will wrap a reflected method call into a
   69    * {@link freemarker.template.TemplateMethodModel} interface. 
   70    * It is used by {@link BeanModel} to wrap reflected method calls
   71    * for non-overloaded methods.
   72    * @author Attila Szegedi, szegedia at users dot sourceforge dot net
   73    * @version $Id: SimpleMethodModel.java,v 1.27 2005/06/11 12:12:04 szegedia Exp $
   74    */
   75   public final class SimpleMethodModel extends SimpleMemberModel
   76       implements
   77       TemplateMethodModelEx,
   78       TemplateSequenceModel
   79   {
   80       private final Object object;
   81       private final BeansWrapper wrapper;
   82   
   83       /**
   84        * Creates a model for a specific method on a specific object.
   85        * @param object the object to call the method on. Can be
   86        * <tt>null</tt> for static methods.
   87        * @param method the method that will be invoked.
   88        */
   89       SimpleMethodModel(Object object, Method method, Class[] argTypes, 
   90               BeansWrapper wrapper)
   91       {
   92           super(method, argTypes);
   93           this.object = object;
   94           this.wrapper = wrapper;
   95       }
   96   
   97       /**
   98        * Invokes the method, passing it the arguments from the list.
   99        */
  100       public Object exec(List arguments)
  101           throws
  102           TemplateModelException
  103       {
  104           try
  105           {
  106               return wrapper.invokeMethod(object, (Method)getMember(), 
  107                       unwrapArguments(arguments, wrapper));
  108           }
  109           catch(Exception e)
  110           {
  111               while(e instanceof InvocationTargetException)
  112               {
  113                   Throwable t = ((InvocationTargetException)e).getTargetException();
  114                   if(t instanceof Exception)
  115                   {
  116                       e = (Exception)t;
  117                   }
  118                   else
  119                   {
  120                       break;
  121                   }
  122               }
  123               if((getMember().getModifiers() & Modifier.STATIC) != 0)
  124               {
  125                   throw new TemplateModelException("Method " + getMember() + 
  126                           " threw an exception", e);
  127               }
  128               else
  129               {
  130                   throw new TemplateModelException("Method " + getMember() + 
  131                           " threw an exception when invoked on " + object, e);
  132               }
  133           }
  134       }
  135       
  136       public TemplateModel get(int index) throws TemplateModelException
  137       {
  138           return (TemplateModel) exec(Collections12.singletonList(
  139                   new SimpleNumber(new Integer(index))));
  140       }
  141   
  142       public int size() throws TemplateModelException
  143       {
  144           throw new TemplateModelException("?size is unsupported for: " + getClass().getName());
  145       }
  146       
  147       public String toString() {
  148           return getMember().toString();
  149       }
  150   }

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