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.util;
018
019/**
020 * Simple strategy interface for resolving a String value.
021 * Used by {@link org.springframework.beans.factory.config.ConfigurableBeanFactory}.
022 *
023 * @author Juergen Hoeller
024 * @since 2.5
025 * @see org.springframework.beans.factory.config.ConfigurableBeanFactory#resolveAliases
026 * @see org.springframework.beans.factory.config.BeanDefinitionVisitor#BeanDefinitionVisitor(StringValueResolver)
027 * @see org.springframework.beans.factory.config.PropertyPlaceholderConfigurer
028 */
029public interface StringValueResolver {
030
031        /**
032         * Resolve the given String value, for example parsing placeholders.
033         * @param strVal the original String value (never {@code null})
034         * @return the resolved String value (may be {@code null} when resolved to a null
035         * value), possibly the original String value itself (in case of no placeholders
036         * to resolve or when ignoring unresolvable placeholders)
037         * @throws IllegalArgumentException in case of an unresolvable String value
038         */
039        String resolveStringValue(String strVal);
040
041}