001/*
002 * Copyright 2002-2012 the original author or 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 *      https://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
017package org.springframework.beans.factory.parsing;
018
019import org.springframework.core.io.Resource;
020
021/**
022 * Simple implementation of {@link SourceExtractor} that returns {@code null}
023 * as the source metadata.
024 *
025 * <p>This is the default implementation and prevents too much metadata from being
026 * held in memory during normal (non-tooled) runtime usage.
027 *
028 * @author Rob Harrop
029 * @since 2.0
030 */
031public class NullSourceExtractor implements SourceExtractor {
032
033        /**
034         * This implementation simply returns {@code null} for any input.
035         */
036        @Override
037        public Object extractSource(Object sourceCandidate, Resource definitionResource) {
038                return null;
039        }
040
041}