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}