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; 020import org.springframework.lang.Nullable; 021 022/** 023 * Simple implementation of {@link SourceExtractor} that returns {@code null} 024 * as the source metadata. 025 * 026 * <p>This is the default implementation and prevents too much metadata from being 027 * held in memory during normal (non-tooled) runtime usage. 028 * 029 * @author Rob Harrop 030 * @since 2.0 031 */ 032public class NullSourceExtractor implements SourceExtractor { 033 034 /** 035 * This implementation simply returns {@code null} for any input. 036 */ 037 @Override 038 @Nullable 039 public Object extractSource(Object sourceCandidate, @Nullable Resource definitionResource) { 040 return null; 041 } 042 043}