Save This Page
Home » freemarker-2.3.13 » freemarker.ext.beans » [javadoc | source]
    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   
   56   import java.lang.reflect.InvocationTargetException;
   57   import java.lang.reflect.Method;
   58   import java.lang.reflect.Modifier;
   59   import java.util.List;
   60   
   61   import freemarker.template.SimpleNumber;
   62   import freemarker.template.TemplateMethodModelEx;
   63   import freemarker.template.TemplateModel;
   64   import freemarker.template.TemplateModelException;
   65   import freemarker.template.TemplateSequenceModel;
   66   import freemarker.template.utility.Collections12;
   67   
   68   /**
   69    * A class that will wrap a reflected method call into a
   70    * {@link freemarker.template.TemplateMethodModel} interface. 
   71    * It is used by {@link BeanModel} to wrap reflected method calls
   72    * for overloaded methods.
   73    * @author Attila Szegedi, szegedia at users dot sourceforge dot net
   74    * @version $Id: OverloadedMethodModel.java,v 1.25 2005/06/11 12:12:04 szegedia Exp $
   75    */
   76   class OverloadedMethodModel
   77   implements
   78   	TemplateMethodModelEx,
   79   	TemplateSequenceModel
   80   {
   81       private final Object object;
   82       private final MethodMap methodMap;
   83       
   84       public OverloadedMethodModel(Object object, MethodMap methodMap)
   85       {
   86           this.object = object;
   87           this.methodMap = methodMap;
   88       }
   89   
   90       /**
   91        * Invokes the method, passing it the arguments from the list. The actual
   92        * method to call from several overloaded methods will be chosen based
   93        * on the classes of the arguments.
   94        * @throws TemplateModelException if the method cannot be chosen
   95        * unambiguously.
   96        */
   97       public Object exec(List arguments)
   98       throws
   99           TemplateModelException
  100       {
  101           MemberAndArguments maa = methodMap.getMemberAndArguments(arguments);
  102           Method method = (Method)maa.getMember();
  103           try {
  104               return methodMap.getWrapper().invokeMethod(object, method, maa.getArgs());
  105           }
  106           catch(Exception e)
  107           {
  108               while(e instanceof InvocationTargetException)
  109               {
  110                   Throwable t = ((InvocationTargetException)e).getTargetException();
  111                   if(t instanceof Exception)
  112                   {
  113                       e = (Exception)t;
  114                   }
  115                   else
  116                   {
  117                       break;
  118                   }
  119               }
  120               if((method.getModifiers() & Modifier.STATIC) != 0)
  121               {
  122                   throw new TemplateModelException("Method " + method + 
  123                           " threw an exception", e);
  124               }
  125               else
  126               {
  127                   StringBuffer buf = new StringBuffer();
  128                   Object[] args = maa.getArgs();
  129                   for(int i = 0; i < args.length; ++i)
  130                   {
  131                       Object arg = args[i];
  132                       buf.append(arg == null ? "null" : arg.getClass().getName()).append(',');
  133                   }
  134                   throw new TemplateModelException("Method " + method + 
  135                           " threw an exception when invoked on " + object + 
  136                           " with arguments of types [" + buf + "]", e);
  137               }
  138           }
  139       }
  140   
  141       public TemplateModel get(int index) throws TemplateModelException
  142       {
  143           return (TemplateModel) exec(Collections12.singletonList(
  144                   new SimpleNumber(new Integer(index))));
  145       }
  146   
  147       public int size() throws TemplateModelException
  148       {
  149           throw new TemplateModelException("?size is unsupported for: " + 
  150                   getClass().getName());
  151       }
  152   }

Save This Page
Home » freemarker-2.3.13 » freemarker.ext.beans » [javadoc | source]