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 015package org.apache.tapestry5.func; 016 017/** 018 * Used when filtering a collection of objects of a given type; the predicate is passed 019 * each object in turn, and returns true to include the object in the result collection. 020 * <p> 021 * The {@link F} class includes a number of Predicate factory methods. 022 * <p> 023 * This was converted from a abstract base class to an interface in 5.3. 024 * 025 * @since 5.2.0 026 * @see Flow#filter(Predicate) 027 * @see Flow#remove(Predicate) 028 */ 029public interface Predicate<T> 030{ 031 /** 032 * This method is overridden in subclasses to define which objects the Predicate will accept 033 * and which it will reject. 034 * 035 * @param element 036 * the element from the flow to be evaluated by the Predicate 037 */ 038 boolean accept(T element); 039}