001/* 002 * Copyright 2002-2016 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.xml; 018 019import org.springframework.lang.Nullable; 020 021/** 022 * Used by the {@link org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader} to 023 * locate a {@link NamespaceHandler} implementation for a particular namespace URI. 024 * 025 * @author Rob Harrop 026 * @since 2.0 027 * @see NamespaceHandler 028 * @see org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader 029 */ 030@FunctionalInterface 031public interface NamespaceHandlerResolver { 032 033 /** 034 * Resolve the namespace URI and return the located {@link NamespaceHandler} 035 * implementation. 036 * @param namespaceUri the relevant namespace URI 037 * @return the located {@link NamespaceHandler} (may be {@code null}) 038 */ 039 @Nullable 040 NamespaceHandler resolve(String namespaceUri); 041 042}