// Copyright 2006 Daniel Gredler

 //

 // Licensed 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 net.sf.beanform.util;

 /**

  * Utility class that can determine the version of Tapestry being used in the current

  * runtime environment, providing version-specific data to the rest of the library.

  *

  * @author Daniel Gredler

  */

 public final class TapestryCompat {

     private final static boolean IS_TAPESTRY_41 = isTapestry41();

     final static String TAPESTRY_41_CANCEL_JS = "tapestry.form.cancel(this.form)";

     final static String TAPESTRY_40_CANCEL_JS = "this.form.events.cancel()";

     final static String TAPESTRY_41_REFRESH_JS = "tapestry.form.refresh(this.form)";

     final static String TAPESTRY_40_REFRESH_JS = "this.form.events.refresh()";

     TapestryCompat() {

         // Empty.

     }

     public static String getCancelJavaScript() {

         if( IS_TAPESTRY_41 ) return TAPESTRY_41_CANCEL_JS;

         else return TAPESTRY_40_CANCEL_JS;

     }

     public static String getRefreshJavaScript() {

         if( IS_TAPESTRY_41 ) return TAPESTRY_41_REFRESH_JS;

         else return TAPESTRY_40_REFRESH_JS;

     }

     private static boolean isTapestry41() {

         boolean isTapestry41;

         try {

             Class.forName( "org.apache.tapestry.IJSONRender" );

             isTapestry41 = true;

         }

         catch( Throwable t ) {

             isTapestry41 = false;

         }

         return isTapestry41;

     }

 }