/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  *   http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

  * KIND, either express or implied.  See the License for the

  * specific language governing permissions and limitations

  * under the License.

  */

 package org.apache.myfaces.view.facelets.util;

 import java.util.ArrayList;

 import javax.faces.FacesException;

 import org.apache.myfaces.shared.util.ClassUtils;

 /**

  * Utility methods used in FaceletsViewDeclarationLanguage

  *

  * @author Leonardo Uribe

  */

 public class FaceletsViewDeclarationLanguageUtils

 {

     public static Class getReturnType(String signature)

     {

         int endName = signature.indexOf('(');

         if (endName < 0)

         {

             throw new FacesException("Invalid method signature:" + signature);

         }

         int end = signature.lastIndexOf(' ', endName);

         if (end < 0)

         {

             throw new FacesException("Invalid method signature:" + signature);

         }

         try

         {

             return ClassUtils.javaDefaultTypeToClass(signature.substring(0, end));

         }

         catch (ClassNotFoundException e)

         {

             throw new FacesException("Invalid method signature:" + signature);

         }

     }

     /**

      * Get the parameters types from the function signature.

      *

      * @return An array of parameter class names

      */

     public static Class[] getParameters(String signature) throws FacesException

     {

         ArrayList<Class> params = new ArrayList<Class>();

         // Signature is of the form

         // <return-type> S <method-name S? '('

         // < <arg-type> ( ',' <arg-type> )* )? ')'

         int start = signature.indexOf('(') + 1;

         boolean lastArg = false;

         while (true)

         {

             int p = signature.indexOf(',', start);

             if (p < 0)

             {

                 p = signature.indexOf(')', start);

                 if (p < 0)

                 {

                     throw new FacesException("Invalid method signature:" + signature);

                 }

                 lastArg = true;

             }

             String arg = signature.substring(start, p).trim();

             if (!"".equals(arg))

             {

                 try

                 {

                     params.add(ClassUtils.javaDefaultTypeToClass(arg));

                 }

                 catch (ClassNotFoundException e)

                 {

                     throw new FacesException("Invalid method signature:" + signature);

                 }

             }

             if (lastArg)

             {

                 break;

             }

             start = p + 1;

         }

         return params.toArray(new Class[params.size()]);

     }

 }