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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    }