// Copyright 2007, 2009 The Apache Software Foundation

 //

 // 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 org.apache.tapestry5.internal.services;

 import org.apache.tapestry5.Binding;

 import org.apache.tapestry5.internal.bindings.AbstractBinding;

 import org.apache.tapestry5.ioc.Location;

 /**

  * Wraps a {@link StringProvider} as a read-only {@link Binding}.

  */

 public class AttributeExpansionBinding extends AbstractBinding

 {

     private final StringProvider provider;

     public AttributeExpansionBinding(Location location, StringProvider provider)

     {

         super(location);

         this.provider = provider;

     }

     public Object get()

     {

         return provider.provideString();

     }

     /**

      * Returns false. Expansions reference properties that may change arbitrarily.

      */

     @Override

     public boolean isInvariant()

     {

         return false;

     }

 }