001    // Copyright 2010 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;
016    
017    import org.apache.tapestry5.PropertyConduit;
018    
019    
020    /**
021     * Extension to {@link org.apache.tapestry5.PropertyConduit} that adds a method to determine the name of the property.
022     * 
023     * @since 5.2.0
024     *
025     */
026    public interface InternalPropertyConduit extends PropertyConduit
027    {
028        /**
029         * Returns the name of the property read or updated by the conduit or null. 
030         * If the expression points to a property on a bean (e.g. user.name) this method returns the last property in the chain. 
031         * Otherwise this method returns {@code null}.
032         * 
033         * @return property name or {@code null}
034         * 
035         */
036        String getPropertyName();
037    }