    001    /*
    002     * Copyright (C) 2007 The Guava Authors
    003     *
    004     * Licensed under the Apache License, Version 2.0 (the "License");
    005     * you may not use this file except in compliance with the License.
    006     * You may obtain a copy of the License at
    007     *
    008     * http://www.apache.org/licenses/LICENSE-2.0
    009     *
    010     * Unless required by applicable law or agreed to in writing, software
    011     * distributed under the License is distributed on an "AS IS" BASIS,
    012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    013     * See the License for the specific language governing permissions and
    014     * limitations under the License.
    015     */
    016
    017    package com.google.common.base;
    018
    019    import com.google.common.annotations.GwtCompatible;
    020
    021    /**
    022     * A class that can supply objects of a single type.  Semantically, this could
    023     * be a factory, generator, builder, closure, or something else entirely. No
    024     * guarantees are implied by this interface.
    025     *
    026     * @author Harry Heymann
    027     * @since 2.0 (imported from Google Collections Library)
    028     */
    029    @GwtCompatible
    030    public interface Supplier<T> {
    031      /**
    032       * Retrieves an instance of the appropriate type. The returned object may or
    033       * may not be a new instance, depending on the implementation.
    034       *
    035       * @return an instance of the appropriate type
    036       */
    037      T get();
    038    }