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 // Copyright 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;

Extension to Asset that adds a method to determine if the asset is invariant or not. org.apache.tapestry5.services.AssetFactory instances should ideally return Asset2 objects, not Asset. This is only of primary interest to the org.apache.tapestry5.internal.bindings.AssetBindingFactory, as it determines the invariance of the binding from the asset (and assumes variant unless the asset object implements this interface).

Since:
5.1.0.0
public interface Asset2 extends Asset
{
    
Returns true if the Asset is invariant (meaning that it returns the same value from Asset.toClientURL() at all times}. Assets that are used as binding values will be cached more aggresively by Tapestry as they are invariant.

    boolean isInvariant();
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