001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.collections4;
018
019/**
020 * Defines a functor interface implemented by classes that create objects.
021 * <p>
022 * A <code>Factory</code> creates an object without using an input parameter.
023 * If an input parameter is required, then {@link Transformer} is more appropriate.
024 * </p>
025 * <p>
026 * Standard implementations of common factories are provided by
027 * {@link FactoryUtils}. These include factories that return a constant,
028 * a copy of a prototype or a new instance.
029 * </p>
030 *
031 * @param <T> the type that the factory creates
032 *
033 * @since 2.1
034 */
035@FunctionalInterface
036public interface Factory<T> {
037
038    /**
039     * Create a new object.
040     *
041     * @return a new object
042     * @throws FunctorException (runtime) if the factory cannot create an object
043     */
044    T create();
045
046}