001    // Copyright 2010, 2011 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.func;
016    
017    /**
018     * A generalization of {@link Mapper} for a two-input function.
019     * <p>
020     * This was converted from to an interface from an abstract base class in 5.3.
021     */
022    public interface Mapper2<A, B, C>
023    {
024        /**
025         * Take, as input, two values (from two flows) and return a computed value of
026         * the third type.
027         */
028        C map(A first, B second);
029    }