    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 *      https://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 */
    017
    018package org.apache.commons.collections4;
    019
    020import java.util.function.Supplier;
    021
    022/**
    023 * Defines a functor interface implemented by classes that create objects.
    024 * <p>
    025 * A {@code Factory} creates an object without using an input parameter. If an input parameter is required, then {@link Transformer} is more appropriate.
    026 * </p>
    027 * <p>
    028 * Standard implementations of common factories are provided by {@link FactoryUtils}. These include factories that return a constant, a copy of a prototype or a
    029 * new instance.
    030 * </p>
    031 *
    032 * @param <T> The type of results supplied by this supplier.
    033 * @since 2.1 This will be deprecated in 5.0 in favor of {@link Supplier}.
    034 */
    035//@Deprecated
    036public interface Factory<T> extends Supplier<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    @Override
    047    default T get() {
    048        return create();
    049    }
    050}