001    // Copyright 2008 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.internal.services;
016    
017    import java.lang.annotation.*;
018    
019    /**
020     * Special annotation that is applied to literal {@link org.apache.tapestry5.PropertyConduit}s, to inform {@link
021     * org.apache.tapestry5.internal.bindings.PropBinding} that the value is, in fact, invariant.
022     */
023    @Target({ElementType.PARAMETER, ElementType.FIELD})
024    @Retention(RetentionPolicy.RUNTIME)
025    @Documented
026    public @interface Invariant
027    {
028    }